NTS150 Time Server Manual NTS 150

User Manual: Time Server

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Network Time Server
NTS–150 & NTS-150D
User’s Manual

NTS-150
Revision G
February 2005

The information in this manual is subject to change without notice and should not be
construed as a commitment by Symmetricom, Inc. Furthermore, Symmetricom, Inc.
reserves the right, without notice, to make changes to equipment design as advances in
engineering and manufacturing methods warrant.
The material described in this manual may be used or copied only in accordance with the
terms of the license pertaining to the software and hardware referred to herein.
© 2003 Symmetricom, Inc.
All rights reserved.
Printed in the U.S.A.
The following are registered trademarks or trademarks of their relative companies or
organizations: Microsoft, Microsoft Windows, HyperTerminal, and Procomm.
The following are registered trademarks or trademarks of their relative companies or
organizations: TrueTime, TrueTime, Inc., Symmetricom, Symmetricom, Inc., Microsoft,
Microsoft Windows, HyperTerminal, and Procomm. MD5 is the trademark or registered
trademark of RSA Security, Inc.
This product includes software derived from the RSA Security, Inc. MD5 Message-Digest
Algorithm, which is provided under license from RSA Security, Inc.
Network Time Protocol (NTP) ©David L. Mills 1992-2003.
Permission to use, copy, modify, and distribute NTP software and its documentation for
any purpose and without fee is hereby granted, provided that the above copyright notice
appears in all copies and that both the copyright notice and this permission notice appear
in supporting documentation, and that the name University of Delaware not be used in
advertising or publicity pertaining to distribution of the software without specific, written
prior permission. The University of Delaware makes no representations about the
suitability this software for any purpose. It is provided "as is" without express or implied
warranty.

Contents

1

General Information
Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Overview of the NTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Limited Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Limitation Of Liability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Proprietary Notice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Physical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Environmental Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Input Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Certifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Internal Timing Performance Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Network Time Protocol Synchronization Specifications . . . . . . . . . . . . . . . . . . . . . . . . .
Front Panel Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Interface Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1
2
2
2
3
3
4
5
5
5
6
7
8

NET Port Ethernet Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Utility RS-232 I/O Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2

Installation and Start-Up
Site Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Mounting Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Necessary Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Antenna Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Voltage Requirement and Signal Levels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Use of a Splitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Lead-In Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
GPS Roof-Mounted Antenna Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
GPS Window-Mounted Antenna (140-619) Installation . . . . . . . . . . . . . . . . . . . . . . 12
Placing the Window Antenna . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Cabling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Power-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Satellite Acquisition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
NTS-150 w. Optional Display (NTS-150D) Only: . . . . . . . . . . . . . . . . . . . . . . .
NET Port Network Parameters: First Time Configuration . . . . . . . . . . . . . . . . . . . . . . .
Verify Functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Wrap-Up & Advanced Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SymmTime 2003 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3

16
18
19
19
19

Remote Operation
Telnet Access . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Starting Telnet and Making a Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Ending Telnet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Serial Access . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

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Serial Line Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
HyperTerminal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Starting HyperTerminal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Setting Up a HyperTerminal Session . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Reconnecting to your last HyperTerminal session . . . . . . . . . . . . . . . . . . . . . . 28
Session Timers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Utility Port Session Timer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Telnet Session Timer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

4

Serial or Telnet I/O Functions
Overview and Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Command List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Function Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
F03 – Time and Date Request . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
F18 – Software Version Request . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
F36 – NET Port Network Configuration Entry/Request . . . . . . . . . . . . . . . . . . . . . . 37
F53 – Operating Mode Request . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
F60 – Satellite List Request . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
F67 – Leap Second Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
F72 – Fault Status Request . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Extended Function Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
F100 BASET – 100 BASE-T/10 BASE-T Control . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
F100 DHCP – DHCP Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
F100 EA – Ethernet Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
F100 IP – IP Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
F100 SM – Subnet Mask . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
F100 G – Gateway . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
F100 IC – NET Port Network Configuration Entry/Request . . . . . . . . . . . . . . . . . . . 46
F100 P – Change User Password . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
F100 ST – Self Test Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
F100 VER – Software Version Request . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
F100 CONFIG – FTP Configuration of NTP & SNMP . . . . . . . . . . . . . . . . . . . . . . . 49
Editing the MD5 keys on the NTP Server . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Editing the MD5 keys on the NTP Client . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
F100 LOCK – Remote Lockout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
F100 UNLOCK – Disable Remote Lockout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
F100 L – Lock Display Request . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
F100 J - Jumper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
F100 BH - Burn Host . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
F100 BU - Burn . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
F100 BUB - Burn BootLoader . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
F100 BF - Burn File System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
F100 K I L L - Reboot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

ii

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F100 BL - Burn Host Lock Request . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
F100 BLS - Burn Host Lock Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
F100 BLR - Burn Host Lock Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
F100 PRESETALL - Password Reset All . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
F100 PN - Password System User Name Change . . . . . . . . . . . . . . . . . . . . . . . . . 62
F100 PR - Password Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
F100 PL - Password Lock Request . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
F100 PLS - Password Lock Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
F100 PLR - Password Lock Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
F100 PI - PING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
F100 PT - Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
F100 QR - Quiet Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
F100 WG - Write GPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Login/Logout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Operator Login . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Guest Login . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Logout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67

5

NTS-Generated Messages
Error Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
LED System Status Alerts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
Solid Red . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
Informational Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

A

Network Time Protocol (NTP) V 3.0 Data Formats
NTP V 3.0 Data Format per RFC-1305 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
NTP Data Packet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
Leap Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
Version Number . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Stratum . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Poll Interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Precision . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Synchronizing Distance (Root Delay Version 3) . . . . . . . . . . . . . . . . . . . . . . . . 75
Synchronizing Dispersion (Root Dispersion Version 3) . . . . . . . . . . . . . . . . . . 75
Reference Clock Identifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
Reference Timestamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
Originate Timestamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
Receive Timestamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
Transmit Timestamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
Authenticator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
SNTP V 3.0 Data Format per RFC-2030 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

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B MD5 Authentication and NTP Broadcast Mode
Introduction to MD5 Authentication Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
NTP Broadcast Mode with MD5 Authentication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
NTP Broadcast Mode without Authentication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
Configuration of NTP on the Timeserver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
Configuration of NTP on the Time Client . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
Polling 83

C TIME and DAYTIME Protocols
TIME Protocol as per RFC-868 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
The Time Protocol Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
DAYTIME Protocol as per RFC-867 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
TCP Based Daytime Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
UDP Based Daytime Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
DAYTIME String Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86

D SNMP – Simple Network Management Protocol
About SNMP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
SNMP Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
Serial or Telnet Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
Symmetricom SNMP Enterprise MIB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
Variable Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91

E Non-Standard Features
Non-Standard Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101

Index
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103

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1
General Information
This manual provides you with all of the information necessary to properly install and
operate the NTS-150 Network Time Server (hereafter referred to as the NTS). The
information in this manual includes any normal maintenance and adjustment data that may
be required to facilitate field repairs.
1.1

Conventions
The conventions used in this manual are:

NTS-150Ch1.fm Rev. G

Text

=

Indicates body text.

Italics

=

Emphasizes important information.

=

Used with bold text to call attention to important information.



=

For input, referring to keys that are labeled on your keyboard.
For example,  means press the Enter key for a line
terminator;  means press the spacebar to enter a space.

Bold

=

Used to show messages, prompts, menus, items in selection
lists, etc., that appear on a computer screen and require action
on your part. For example, Press the Submit Changes button.

text

=

Used to display output character strings.

text

=

Used to indicate text you should enter with your keyboard,
exactly as printed.

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Chapter 1: General Information

1.2

Overview of the NTS

Overview of the NTS
The NTS is a high-performance Network Time Protocol (NTP) server that provides time
with extreme accuracy, using the Global Positioning System (GPS) as a synchronization
source. The NTS provides Internet Protocol (IP) network time synchronization over
Ethernet connected networks via NTP, developed by Dr. David Mills at the University of
Delaware. The NTS currently supports versions 2 and higher of the NTP, RFC-1305, as
well as the Simple Network Time Protocol (SNTP), RFC-2030. In addition, the NTS
responds to TIME protocol requests (RFC-868) and DAYTIME protocol requests
(RFC-867). For details about these protocols, refer to Appendix A and Appendix C in this
manual.
The main feature of the NTS interface is its ability to perform setup and control operations
from a remote location, using the Internet or TCP/IP LAN (see Chapter 3). The protocol
used is Telnet. An NTS has an RJ-45 Ethernet connector on its NET Port, providing NTP
and IP access, and a 9-pin D serial connector for serial input/output. The optional
configuration of the NTS-150 with a front panel display, indicates unit status and time.

1.3

Limited Warranty
Each new product manufactured by Symmetricom is warranted for defects in material or
workmanship for a period of one year from date of shipment (“Limited Warranty”).
Defects in material or workmanship found within that period will be replaced or repaired,
at Symmetricom's option, without charge for material or labor, provided the customer
returns the equipment, freight prepaid, to the Symmetricom factory under this limited
warranty. Symmetricom will return the repaired equipment, freight prepaid, to the
customer's facility. This one year Limited Warranty does not apply to any software or to
any product not manufactured by Symmetricom.

1.4

Limitation Of Liability
By purchasing any product from Symmetricom, the Buyer consents to and agrees that the
Buyer's sole and exclusive remedy for any damages or losses incurred by the Buyer, as a
result of Symmetricom's breach of its one-year Limited Warranty for defects in materials
and workmanship or otherwise in connection with any claim respecting the product, shall
be limited to the repair or replacement of the product or a refund of the sales price of the
product.
In no event shall the Buyer be entitled to recover consequential damages or any other
damages of any kind or description whatsoever.

2

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1.5

Chapter 1: General Information

Proprietary Notice
THIS DOCUMENT, WHETHER PATENTABLE OR NON-PATENTABLE SUBJECT
MATTER, EMBODIES PROPRIETARY AND CONFIDENTIAL INFORMATION AND
IS THE EXCLUSIVE PROPERTY OF SYMMETRICOM, INC. IT MAY NOT BE
REPRODUCED, USED OR DISCLOSED TO OTHERS FOR ANY PURPOSE EXCEPT
THAT FOR WHICH IT IS PURCHASED OR LOANED.

1.6

Physical Specifications
The NTS fits in a standard 1U (1.75-inch [4.445-cm]) high, 19-inch (48.26-cm) rack
mount package (see page 9 for mounting instructions) and has the following physical
specifications:
NTS Chassis, with rails and handles
Size:

1.73 in x 17.00 in x 11.63 in (4.39 cm x 43.18 cm x 29.54 cm)

Weight:

4.21 lb max. (1.91 kg)

Standard Antenna
Size:

2.625 in dia. x 1.5 in (6.67 cm dia. x 3.81 cm)

Weight:

0.55 lb (0.250 kg) (including mounting mast)

Power Regulated:

+12 V @ <25 mA

Frequency (L1):

1575.42 MHz
Coarse Acquisition (C/A) Code

Window Antenna
Size:

2.10 in dia. x 0.9 in (5.33 cm dia. x 2.29 cm)

Weight:

4 ounces (0.250 kg)

Power Regulated:

+12 V @ <25 mA

Frequency (L1):

1575.42 MHz
Coarse Acquisition (C/A) Code

Antenna Cable (for Standard Antenna)
Type:

RG-59
Attenuation at 1575.42 MHz should be no more than 10.5 dB per
100 feet (Belden 9104 or equivalent)

Length:

50 ft (15.24 m) [available in lengths up to 200 ft (60.96 m)]

Weight:

1.2 lb (0.545 kg)

The NTS-150 requires a 12 V antenna and may severely damage any antenna that does not
support 12 V. For non-standard antenna types, contact Symmetricom for assistance.

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1.7

Environmental Specifications

Environmental Specifications
The environmental specifications of the NTS are:
Operating Temperature
NTS Module:

0 to +50 °C (+32 to +122 °F)

Standard and Window Antenna:

–40 to +70 °C (–40 to +158° F)

Maximum Rate of Change:

8 °C per hour

Storage Temperature
NTS Module:

–50 to +85 °C (–40 to +185 °F)

Standard Antenna:

–55 to +85 °C (–67 to +185 °F)

Maximum Rate of Change:

15 °C per hour

Operating Humidity
NTS Module:

0% up to 95%, non-condensing

Standard Antenna:

100%, condensing

Storage Humidity
NTS Module:

0% up to 95%, non-condensing

Standard Antenna:

100%, condensing

Operating Altitude
NTS Module:

Maximum 4 km

Storage Altitude
NTS Module:

Maximum 12 km

Shock & Vibration Requirements

4

In Shipping Container:

Per ISTA Procedure 2A

Bench Handling without Shipping
Container:

Per EN60068-2-31

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1.8

Chapter 1: General Information

Power Input Specifications
The power input specifications of the NTS are:
Power Input

1.9

AC Mains:
(base model)

100 to 240 VAC, 47–440 Hz
IEC 320 Connector

–48 VDC
(optional):

–36 to –60 VDC
4 position Barrier Strip Connection
Fuse: 1A Slow-Blow (rear panel)

Power Requirement:

<20 W maximum

Certifications
FCC
CE (applies to base model only)
UL (applies to base model only)

1.10

Internal Timing Performance Specifications
The absolute time and frequency characteristics of the NTS are essentially those of the
input synchronization source. The relative synchronization characteristics given here
reflect the capabilities of the NTS to preserve the time and frequency characteristics of its
synchronization source.
The NTS output signal timing and frequency specification, relative to input
synchronization source, is:
Internal Timing Accuracy: <5 µs to UTC when synchronized via GPS
Following initial synchronization of the NTS to an input synchronization source, if that
synchronization source is lost, and if the ambient temperature of the unit is maintained
within ± 3 °C, the time maintained in the unit will diverge from the input at the rate of
approximately 6 parts in 10-6.

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1.11

Network Time Protocol Synchronization Specifications

Network Time Protocol Synchronization Specifications
The NTS hardware is designed specifically to implement the NTP server function. As
such, it was carefully designed to operate with the real-time operating system to minimize
the unknown latencies in timestamping the received and transmitted NTP packets. The
NTP Packet timestamp accuracy specifications are:
Received Timestamp Accuracy:

<0.1 ms, relative to synchronization source

Transmitted Timestamp Accuracy: <0.1 ms, relative to synchronization source
Network timing accuracy is limited to 1-10 ms typical.

At these levels of accuracy, the realizable NTP synchronization accuracy of any host is
determined by the repeatability of the network and client delays, not by the NTS
timestamp uncertainty.
The NTS supports the following protocols:
• Telnet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .RFC-854
• DAYTIME . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .RFC-867
available in both TCP and UDP protocols

• TIME . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .RFC-868
available in both TCP and UDP protocol

• FTP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .RFC-959
• SMI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .RFC-1155
• SNMP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .RFC-1157
• MIB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .RFC-1212
• MIB II . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .RFC-1213
• NTP ver. 4.0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .N/A
(backwards compatible with NTP v.2, RFC-1119, and v.3, RFC-1305**)

• MD5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .RFC-1321
• SNTP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .RFC-2030
• DHCP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .RFC-2132
* SMI = Structure of Management Information
** The NTS does not implement the “authenticator field” of the NTP packet as
described in Appendix C of RFC-1305.
Complete RFC information is available at the following web site: http://www.ietf.org/
An NTP or SNTP client, compatible with the computer platform you use and configured
to use the NTS NET Port IP address, is required for accurate network synchronization. In
this manual, refer to Appendix A and Appendix B for details about NTP and SNTP
protocols, and Appendix D for details about SNMP and MIB.

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Front Panel Features

1.12

Chapter 1: General Information

Front Panel Features
This section provides a general description of the NTS front panel features.
Two front panel mounted, tricolor LEDs reflect the status of the NTS. The system status
indicator at the left end of the front panel has two meanings:
System Status Indicator

It Means...

Solid Red

No signal from time source,
or major alarm fault detected

Blinking Green

The NTS is fully operational

Possible causes and solutions for problems resulting in a solid red LED are discussed in
“LED System Status Alerts” on page 71.
The connection active indicator, labeled “ACT” and located to the right of the NET Port’s
RJ-45 plug, indicates the connection speed on the NET Port:

System
Status
Indicator

“ACT” Indicator

Network Connection Speed

Solid Yellow

10Base-T

Solid Green

Up to 100Base-T

NET Port

Optional Display

Serial I/O Port

Rack Mount Handle

Connection Active
(“ACT”)
Indicator

Figure 1-1 NTS Front Panel

While starting, the optional display shows “Booting...”, “Starting...”, and “Loading...”
Until the unit has acquired GPS satellites, the display shows “Time Not Available”
Once it starts tracking GPS satellites, it displays “Satellites Tracked = #” (# = 1-4)
Once it has acquired enough GPS satellites, it briefly displays “Initializing NTP” followed
by the UTC time and date. The UTC date is followed by a G, which indicates the time
source the unit is using.

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Interface Specifications

1.13

Interface Specifications

1.13.1

NET Port Ethernet Interface

Type:

Standard RJ-45 8-pin connector for 10Base-T and 100Base-T
standards

Frame Format: IEEE 802.3
Supported Protocols/Applications:
Telnet

SNTP

DHCP

SNMP

TCP/IP

NTP and Broadcast NTP

FTP
1.13.2

Utility RS-232 I/O Interface

Data:

Serial functions, as listed on page 36

Data Rates:

9600

Data Bits:

8

Parity:

None

Stop Bits:

1

Connector:

Male 9-pin D subminiature, wired as DTE, located on the front
panel

Serial I/O settings are factory set and cannot be changed.

The following chart shows pin assignments for the RS-232 connector:
Table 1-1 RS-232 Interface Pin Assignments

8

Pin

Assignment

1

NC

2

RXD

3

TXD

4

NC

5

GND

6-9

NC

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2
Installation and Start-Up
2.1

Site Preparation

2.1.1

Mounting Instructions

To securely mount the NTS-150 in any EIA standard 19-inch (48.26-cm) rack system, use
the equipment supplied with the Rack Mount Kit (included with the NTS-150) and follow
the steps outlined below.
The Rack Mount Kit contains:
• 2 mounting brackets (part number 206-719)
• 4 flat-head, Phillips screws (part number 241-008-005, 8-32 x 5/8)
To rack mount the NTS-150:
1. Remove and discard the two factory-installed flat head (Phillips) screws from the front
end of an NTS-150 side panel.
2. Place a rack mount bracket on the side panel, so that the countersunk screw holes in
the bracket line up with the screw holes in the panel.

Replace the
factory-installed screws
with screws from the
Rack Mount Kit

3. Place two of the screws from the Rack Mount Kit through the holes in the bracket and
into the NTS-150.
4. Tighten the screws to the following specifications:
Use a #2 size Phillips bit with an inch ounce torque setting of 4 ¼ to 4 ¾ (high).
5. Repeat steps 1-4 to install the other rack mount bracket on the unit’s other side panel.

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Site Preparation

6. Place the NTS-150 in a 1 ¾ inch (4.445 cm) opening in any EIA Standard 19 inch
(48.26 cm) rack system, and position the unit so that the rack holes line up with the
holes in the bracket.

Rack Mount Screws

7. Use the appropriate screws to secure the brackets to the rack.
8. Ensure that the operating ambient temperature does not exceed +50 °C.
Installation requires the use of standard rack mount hardware.

2.1.2

Necessary Equipment

The equipment you need to get started includes:
• Power source
• GPS antenna connection that supports 12 V
• An Ethernet LAN with one port available for the NTS network connection
• An Ethernet cable with an RJ-45 connector for the NET Port (Category 5 Ethernet
cable is recommended for 100Base-T operation)
• A set of network address parameters for the NET Port that delivers NTP time and
allows remote control of the unit over the Internet
• A serial interface device, either PC or dumb terminal capable of 9600 8N1
• An RS-232 cable, and null modem connector, to connect the 9-pin D RS-232 port to
the serial device
The NTS-150 requires a 12 V antenna and may severely damage any antenna that does not
support 12 V. For non-standard antenna types, contact Symmetricom for assistance.

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Site Preparation

2.1.3

Chapter 2: Installation and Start-Up

Antenna Information
Voltage Requirement and Signal Levels

12 V GPS Antenna

The NTS requires a 12 V GPS antenna. Any antenna that
does not support 12 V may be severely damaged if
plugged into the NTS.
Coaxial Cable

The GPS Synchronized Receiver, integral to the NTS,
operates on the L1 (1575.42 MHz) signal and the C/A
code (1.023 MHz bit rate) with a minimum signal
level of –162.0 dBW and a maximum signal level of
–137.0 dBW. The antenna system supplied is designed
to provide the proper signal levels to the receiver with the
cable length supplied.

Threaded Cable
Housing

Figure 2-1 Basic Antenna
Components

Use of a Splitter

To run multiple units with a single 12 V antenna, use a splitter. Do not use a BNC
“T” connector.
Lead-In Cable

The L1 GPS antenna is designed to operate with up to 150 ft (60.96 m) of RG-59 coax
cable. The optional Down Converter is designed to operate with up to 1,500 ft (457.2 m)
of RG-58 coaxial cable. For details and illustrations on cabling, see page 12.
2.1.4

GPS Roof-Mounted Antenna Installation

When selecting a site for the antenna, find an outdoor location that provides full
360-degree visibility of the horizon. In most cases, this means locating the antenna as
high as possible. Any obstruction will degrade unit performance by blocking the satellite
signal or causing a reflection that creates signal interference. Blocked signals can
significantly increase the time for satellite acquisition, or prevent acquisition all together.
Mast Mounting

Mast top mounting is the preferred mounting method and
special brackets are provided to mount the antenna to a pipe or
the peak of a building. The antenna mounting mast should be
2-inch (5.08-cm) water pipe or conduit. The mast must be rigid
and able to withstand high winds without flexing. Guy wires
may be used to stabilize a mast longer than 10 ft (3.048 m)
Multipath interference is caused by reflected signals that
arrive at the antenna out of phase with the direct signal.
Reflective interference is most pronounced at low elevation
angles from 10 to 20 degrees above the horizon. You may
extend mast height to prevent multipath interference. The
antenna should be at least 3.28 ft (1.0 m) from a reflecting
surface. The figure at the right shows the recommended
mounting of the antenna to the mast.
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12 V GPS
Antenna

Mast

Figure 2-2: Mast Mounting
Illustration

11

Chapter 2: Installation and Start-Up

2.1.5

Site Preparation

GPS Window-Mounted Antenna (140-619) Installation

The GPS Window-Mounted Antenna is intended for use
with products featuring ‘single satellite timing,’ (available
with firmware version 8 and above). Customers with units
running earlier firmware versions should upgrade to the
current version. Information on upgrading is available at
http://www.ntp-systems.com/.
Window mounted antennas have a restricted view of the
sky, yielding intermittent satellite coverage. With single satellite timing, a network time
server can synchronize with individual GPS satellites as they pass through the antenna’s
field of view.
Placing the Window Antenna

Select the window with the best unobstructed view of the sky. For equivalent views, select
the window with the best orientation. The orientations, in order of preference, are as
follows:
1. Equator-facing (e.g., South, for users in the Northern hemisphere.)
2. East/West-facing
3. Polar-facing (e.g., North, for users in the Northern hemisphere.)
Note: Regardless of orientation, use the window with the best view of the sky.
Mount the antenna on the lower part of the window, where it has the best upward
visibility, by pressing the suction cup onto the window. Make sure the window and suction
cup surfaces are clean. Note that some windows have metallic glazing that blocks GPS
signals: this prevents GPS receivers from tracking satellites and determining the time.
B e s t W in d o w

12:00 NOON

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Cabling

2.2

Chapter 2: Installation and Start-Up

Cabling
Refer to the figures below for NTS connector locations. The numbers in the drawing refer
to that connector’s position in Table 2-1.
Connect the cables in the order listed in Table 2-1 below. In order to avoid network addressing
conflicts, be sure to configure network parameters before connecting the Ethernet cable.

Power Input (3)

Chassis Ground (2)

12V Antenna (1)

Figure 2-3: NTS Back Panel Cabling Illustration (AC Mains)

Power Input (3)

Chassis Ground (2)

12V Antenna (1)

Figure 2-4: NTS Back Panel Cabling Illustration (–48 VDC)

For the –48 VDC model, connect the rear panel chassis ground to your system ground, the
positive connection from the power supply to the “+” of the rear panel terminal strip, and
the negative connection from the power supply to the “–” of the rear panel terminal strip.

NET Port (4)

Serial Port (5)

Figure 2-5: NTS Front Panel Cabling Illustration

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Chapter 2: Installation and Start-Up

Cabling

Table 2-1: NTS Cabling Chart
Connection
Steps

Cable Name

1

Sync In

Required /
Optional

Connect Point /
Type

Label

Required

12 V GPS
Antenna

ANTENNA

(Be sure your
antenna supports
12 V)

2

Chassis
Ground

Required

Ground screw

3

Power

Required

Power socket

100–240 V, 1 A
50–60 Hz
or
36–60 VDC POS GND

Stop cabling at this point, enter network parameters as per Section “NET Port Network Parameters: First
Time Configuration” on page 18, then resume cabling with Step 4. Any changes to the network settings
take effect after the unit is rebooted. For the NTS-150 to automatically negotiate the highest connection
speed, it needs to be connected to the network when booting. If the NTS-150 is connected after booting,
it will use a slower fall-back connection speed.

14

4

NET
Interface

Required

RJ-45
10Base-T /
100Base-T

NET

5

Serial
Interface

Required

RS-232
9-pin D
wired as DTE

SERIAL I / O
RS-232

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Power-Up

2.3

Chapter 2: Installation and Start-Up

Power-Up
At power-up (cold boot), the front-panel LED is red.
Satellite acquisition may take up to 20 minutes. When the NTS is locked to GPS, the LED
will change from red to blinking green.
For units with the optional display:
•
•
•
•

•

At power-up (cold boot), the front-panel display is blank.
The display shows “Booting”, “Starting”, and “Loading” over a span of approximately
30 seconds while the unit initializes.
Once the unit has initialized, you can enter settings through the serial port or Telnet
command line interface.
When the unit starts acquiring time, it displays “Time Not Available”, followed by
“Satellites Tracked = #” (Where “#” can equal 1-6). Once time has been acquired, it
displays the UTC time and date. A “G” following the date indicates that GPS is the
time source.
Time acquisition can take approximately 20 minutes, but varies widely depending on
conditions such as the antenna position.
Satellites
Tracked =

2.3.1

1

Satellite Acquisition

Network Time Servers with firmware version 8 or higher have been optimized for both
window and roof mounted GPS antennas. Specifically, the new system firmware allows
the unit to use a single GPS satellite (versus three satellites in previous versions) as a valid
reference source. This enables the NTS to operate effectively with window mounted
antennas, which have limited visibility when compared to roof mounted antennas.
Satellite acquisition begins at power-up and continues until power-down. Time to first
satellite acquisition depends on many factors. The NTS attempts to acquire satellites, not
knowing which satellites are visible. After first satellite acquisition, time is acquired from
the satellite and the receiver assumes to normal operation. This procedure takes
approximately 3 to 20 minutes, depending upon satellite visibility.
If the current position is unknown or in error by more than 1 km (0.62 miles), acquisition
typically requires from 3 to 20 additional minutes to locate current antenna position,
reacquire satellite almanac and ephemeris data, and deliver UTC time. However, since the
NTS is optimized for time functionality, accurate position readouts are not available.
NTP stabilization, which allows the unit to output accurate time and which may take 8-10
minutes, begins after the NTS acquires the first satellite. During this procedure, the
optional display (if available) sets the “Initializing” message then updates the number of
satellites which have been newly acquired. NTP stabilization usually takes place between
acquisition of the 5th and 6th satellites.

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Power-Up

NTS-150 w. Optional Display (NTS-150D) Only:

During NTP stabilization, the display reads:
Initializing
NTP...

Satellites
Tracked = X

where:
X

=

the number of the next satellite the NTS acquires.

Once stabilized, NTP displays UTC time and the current date on the front panel display in
the following default format:
UTC: DDD;HH:MM:SS
dddmmmnnyyyy...

where:
DDD

=

day of year

HH

=

hour

MM

=

minutes

SS

=

seconds

ddd

=

day of the week (abbreviations are: “Sun”, “Mon”, “Tue”,
“Wed”, “Thurs”, “Fri”, “Sat”

mmm

=

month (abbreviations are: “Jan”, “Feb”, “Mar”, “Apr”, “May”,
“Jun”, “Jul”, “Aug”, “Sep”, “Oct”, “Nov”, “Dec”)

nn

=

day of month

yyyy

=

year

An illustration of the front panel default display appears on the next page.
Once the NTS has synchronized itself, then it is ready to respond to time requests that it
receives over the network through supported protocols. During interruptions of the
synchronization input, the NTS estimates the quality of the time it is able to provide to
clients and updates the fields of the NTP packet appropriately.
If the NTS has saved a good current average position and has saved recent UTC leap
second information, it typically locks to GPS in 3 to 5 minutes and delivers UTC time.

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Power-Up

Chapter 2: Installation and Start-Up

Window Antenna Satellite Tracking
Firmware version 8 and above enable the NTS-150, NTS-200, and TimeVault to operate
with window-mounted GPS antennas. Because window mounted antennas have a
restricted view of the sky; they receive fewer GPS satellite signals than roof mounted
antennas. In some situations, a window-mounted antenna may provide only one
intermittent GPS signal to lock onto as individual GPS satellites pass through its field of
view. Firmware version 8 enables network time servers to use GPS as a reference source
when intermittent GPS satellite signals are available.
Note: It is critical that NTS-150, NTS-200, and TimeVault units running earlier
firmware should upgrade to the current version (www.truetime.net/downloads.html).
Link to upgrade notice.
Summary of the differences between current and previous firmware versions: srini 650
934 0541
V.7 and earlier

V. 8 and after

All products lock onto three or more
satellite signals to establish GPS as the
reference source.

The NTS-150 and NTS-200 lock onto one
satellite signal to establish GPS as the
reference source. Note: The TimeVault
initially requires three to establish GPS
reference.

Requires continuous lock on three satellite
signals to maintain GPS as the reference
source.

Requires intermittent fix from three
satellite signals (several times a day). Will
hold lock on one satellite signal to maintain
GPS as the reference source.

Operates with roof mounted antennas.

Operates with window and roof mounted
antennas.

If the number of current satellite signals
drops to 1 or 2, the unit uses GPS as
reference source for 10 minutes.

If the number of satellite signals drops to
zero, the unit keeps GPS as the reference
source for 5 minutes while it locks onto
another GPS satellite signal.

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2.4

NET Port Network Parameters: First Time Configuration

NET Port Network Parameters: First Time Configuration
After connecting the GPS antenna, supplying power to the NTS, and achieving successful
stabilization (see section “GPS Window-Mounted Antenna (140-619) Installation” on
page 12), configure the network parameters and functions for the first time. Once the
parameters are input, then connect the Ethernet cable and the serial cable.
The configurable NET Port network parameters and functions are:
• IP Address
• Subnet Mask
• Default Gateway
• DHCP
• Remote Control
For this first configuration, enter the appropriate parameter values and function settings
through the serial port (referred to in this manual as the “Utility Port”) via a serial device
connected at 9600 8N1. Subsequently, you can edit parameter values and function
settings through the Utility Port, or using Telnet (see Section “Extended Function
Commands” on page 41).
To set the NET Port network parameter values and function settings through the Utility
Port, use F100 IC:
F100 IC IP:xxx.xxx.xxx.xxx SM:xxx.xxx.xxx.xxx G:xxx.xxx.xxx.xxx

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2.5

Chapter 2: Installation and Start-Up

Verify Functionality
To verify that the unit is running:
1. Ping the NET Port IP Address.
2. If this action fails, check the configuration values assigned to the NET Port. Correct
parameters as necessary using the serial/Telnet Function F100 IC command, described
on page 46.
3. If ping fails again, verify with your system administrator that the values used are
correct. Then re-enter parameters as necessary.

2.6

Wrap-Up & Advanced Operation
When the LAN interfaces are operational and time is being reported, the unit has achieved
its basic level of functionality. For “quick start” information, see the Quick Start card that
came packaged with this manual. For remote operation, see Chapter 3. For details on
serial/Telnet commands, see Chapter 4.
If you wish to use SNMP (the NTS supports a SNMP version 1 agent with the MIB II and
Enterprise MIB databases), you must first edit the snmp.conf file (see Section “F100
CONFIG – FTP Configuration of NTP & SNMP” on page 49 for details).

2.7

SymmTime 2003
SymmTime 2003 is a free download that automatically synchronizes your Windows PC’s
clock to any NTP (Network Time Protocol) server accessible from your computer.
SymmTime is free, can be used in any windows PC environment (Windows 95, 98, ME,
NT 4, Windows 2000 and Windows XP operating systems only) and can be downloaded at
http://www.ntp-systems.com/symmtime.asp.
With SymmTime your system clock is correct and accurate because it's automatically
synchronized to any NTP (Network Time Protocol) server accessible from your computer.
Once it is up and running you can set as many — or as few — clocks on your computer as
you want. You can set the display to any size or color you want and at a glance you can see
what time it is in Tokyo, Sydney, Los Angeles, Chicago, New York, Buenos Aires,
London, Moscow, Dakar, Singapore and Beijing.

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20

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3
Remote Operation
The NTS-150 is an advanced network time server that provides accurate time over an
Ethernet connection to multiple client sites. A great strength of the NTS is its remote
control capability. You can configure parameters through command line input using Telnet
from a distant terminal to program the unit over the Internet, from anywhere in the world.
The NTS reports time with extreme accuracy, using GPS as a synchronization source.
Optimization for time functionality means that accurate position readouts are not
available.
3.1

Telnet Access
The NTS can perform setup and control operations sent from a remote location through
the Internet. The protocol used for Internet access to an NTS is Telnet, a standard Internet
communications program, with an ASCII character-based interface, that connects to the
NTS through its NET Port. Use Telnet just like Procomm, or any other serial interface
program, by entering F-series commands, to which the NTS responds.
The Utility Port takes precedence over the Telnet session. If the Utility Port is active,
either Telnet login will fail or, if already logged in, trying to send any Telnet command
generates the response:
NOTICE: Cannot respond to command because Utility Port
session has priority.

Telnet sessions have a 15 minute session timer. If there is no activity on the Telnet
session, the timer automatically terminates the session.

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3.1.1

Telnet Access

Starting Telnet and Making a Connection
The following section only applies to Microsoft Windows users. If you are using an operating
system other than Windows (such as Macintosh or UNIX), check with your System
Administrator for Telnet application information.

1. Press the Start button at the lower left of your screen.
2. Click Run and enter Telnet in the Open field.
The Run dialog box appears:

3. Click OK.
The Telnet – (None) window appears:

4. Click Connect, the first item on the Telnet menu bar, then select Remote System.
The Connect dialog box appears:

5. In the Host Name field, enter the IP Address of the NTS.
Do not change the text in the two other fields, which should read “Telnet” and
“VT100”.
6. Click Connect to start a Telnet connection to the NTS.
If the connection was successful, a login prompt appears:

If an hourglass appears instead, it means the connection was not successful and
you should repeat steps 1-5.

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7. Enter the login name guest.
A password prompt appears.
8. Enter the default password truetime (one word, all lower case).
A welcome message appears if the login and password are approved:

9. Begin your Telnet session by entering F-series commands.
3.1.2

Ending Telnet

There are three ways to end Telnet:
• Close it from your terminal by selecting Exit from the Connect menu.
• Enter an exit command, such as exit, or quit.
• Let it timeout. If no commands are received for 15 minutes, the NTS automatically
terminates the session.
3.2

Serial Access
The RS-232 connector provides serial access. The RS-232 connector is located next to the
NET Port (see Figure 1-1 on page 7). This connector is labeled “Serial I/O”, and is
referred to as the “Utility Port.” Table 3-1 below describes the Utility Port’s RS-232
pinouts and signal levels.
Serial time output is not available on the Utility Port.
Table 3-1: RS-232 Pinouts and Signal Levels
NTS

1

IN RXD

2– – – – – – <– – – – – – –3

TRANSMITTED DATA

OUT TXD

3– – – – – – >– – – – – – –2

RECEIVED DATA

GND

8

SIGNAL DESCRIPTION

OPEN

OPEN

NTS-150Ch1.fm Rev. G

9- to 25- PIN ADAPTER CABLE
9-pin
25-pin

4

20

5– – – – – – <>– – – – – – 7

DCD, CARRIER DETECT

DTR, DATA TERMINAL READY
SC, SIGNAL GROUND

OPEN

6

6

DSR, DATA SET READY

OPEN

7

4

RTS, REQUEST TO SEND

OPEN

8

5

CTS, CLEAR TO SEND

OPEN

9

22

RI, RING INDICATOR

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Chapter 3: Remote Operation

3.2.1

Serial Access

Serial Line Settings

Serial I/O settings are factory set and cannot be changed. The default serial format is:
Data Rates:

9600 bits/second

Word Length: 8 bits
Parity:

None

Stop Bits:

1

The Utility Port can be connected either to a terminal or to a computer, using a null
modem cable, and used in conjunction with any serial access (terminal emulation)
software program, such as Procomm or HyperTerminal. The following section illustrates
a terminal connection, using HyperTerminal, a popular Windows-based application. All
commands are input using conventional F-series type commands (see “Command List” on
page 33).
These examples apply only to systems using Windows 95/98/NT. Check with your System
Administrator if you are using a different operating system (such as Macintosh or UNIX).

3.2.2

HyperTerminal
Starting HyperTerminal

To start HyperTerminal:
1. Click the Start button on the task bar.
2. Select Programs > Accessories > HyperTerminal > HyperTerminal.
The Connection Description dialog box appears:

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Chapter 3: Remote Operation

3. Enter a name (such as “NTS”) for this connection in the Name box and click OK.
The Connect To dialog box appears:

4. In the Connect using box, use the drop-down menu to select your modem’s COM
port (COM1 in this example), then click OK.
The COM1 Properties dialog box appears, showing the Port Settings tab:

5. Edit the fields in the Port Settings dialog box as follows:

NTS-150Ch1.fm Rev. G

Bits per second:

9600

Data Bits:

8

Parity:

None

Stop Bits:

1

Flow control:

None

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Chapter 3: Remote Operation

Serial Access

6. Click OK.
The NTS HyperTerminal window appears, indicating the NTS is now connected
through the Utility Port:

Setting Up a HyperTerminal Session

To set up a HyperTerminal session:
1. From the File menu in the session window, select Properties.
The NTS Properties dialog box appears, showing the Connect To tab:

2. Select the Settings tab and click the Terminal keys radio button:

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Chapter 3: Remote Operation

3. In the Emulation box, use the drop-down menu to select VT100 terminal type (do
not select the Auto detect option).
4. Click Terminal Setup and configure the terminal by selecting the appropriate
options in the Terminal Settings dialog box (with a VT100 terminal, the recommended settings are pictured below):

5. Click OK.
The NTS Properties dialog box is reactivated.
6. In the NTS Properties dialog box, click ASCII Setup…
The ASCII Setup dialog box appears:

7. Place check marks in the following boxes:
• Send line end with line feeds
• Wrap lines that exceed terminal width
8. Click OK.
This returns you to the NTS Properties dialog box.
9. Click OK.
This returns you to your HyperTerminal session window, where you can enter
“F” series commands. Press the Return key to get a > prompt.

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Serial Access

10. When exiting HyperTerminal, click Yes when prompted to save the current
session:

The next time you launch HyperTerminal from the Start menu, you can reconnect to
the session you just created.
Reconnecting to your last HyperTerminal session

To reconnect to your last HyperTerminal session:
1. From the HyperTerminal window, select File > Open.
2. Double-click your last session:

The name of your last session

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3.3

Chapter 3: Remote Operation

Session Timers
There are timers on Utility Port and Telnet control sessions that terminate them if there is
a lack of activity. Any action you take during a session automatically resets the timer, and
it starts all over again. The timers and their interactions are described below.

3.3.1

Utility Port Session Timer

The Utility Port Session Timer starts upon receipt of a character from the Utility Port. The
timer is reset upon receipt of every character. If no characters are received for 15
consecutive minutes, the session terminates.
When a Utility Port Session is in progress, Telnet cannot execute any commands to the
NTS. The Utility Port Session must end before full Telnet access is possible.
3.3.2

Telnet Session Timer

The Telnet Session Timer starts upon receipt of a command line from Telnet, via the NET
Port. The timer is reset upon receipt of every command line. If no lines are received for
15 consecutive minutes, the session terminates.
Terminating a Telnet session drops the connection to the remote host. You can
immediately activate a new session by re-connecting and logging in again.

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4
Serial or Telnet I/O Functions
4.1

Overview and Format
Shortly after power-up, the utility port will be ready to receive commands.
You can send data to, or request data from, the NTS by sending serial or Telnet commands
using ASCII character strings. The general form of these commands is:
F

where:
F



=
=
=

ASCII character F
two-digit function number
input line terminator

More specifically, the data input and output formats are:
F[]

(input)

or
F[] (output)

where:
F




[]

=
=
=
=
=
=

ASCII character F
function number
space
data entry or request
output line terminator
encloses a phrase that is repeated as often as
necessary

Output strings are kept to fixed lengths whenever possible. This means that numeric
values often contain many leading blanks. This user’s guide represents output strings in a
fixed font. For example:
F60 prn 14 good enabled sig level= +21.37

The formats of the output strings are designed so that it is possible to request the state of a
function and save the response string. Later that string can be sent to the unit to restore the
original state of that function.
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Overview and Format

Input strings sent to the unit may vary in length. The manual represents what you should
type in the same fixed font, with a bold typeface. It represents the necessary keyboard
action differently, however, as per the manual conventions (page 1). For example:
F03

The number of separators between fields may vary. You can enter numeric values with or
without leading zeros. When entering positive quantities, you can omit the plus sign.
String fields (such as “on” or “off”) may be entered in upper or lower case, as can the “F”
that starts all serial or Telnet commands. Some fields of some commands are optional and
may be replaced by a semicolon. In that case, the corresponding value is unchanged.
End all input strings by pressing the  or  key on your keyboard.
An incorrect entry may result in an error message, as described in “Error Messages” on
page 69. The NTS responds to correct entries with:
OK

In addition to the regular F-series commands, there is also a set of F100 commands,
known collectively as Extended Function Commands. With certain F100 commands, you
can reconfigure network parameters, such as IP Address, or modify function settings like
Remote Lockout. These commands include F100 BASET, IP / SM / G / CONFIG (“set”
commands) / DHCP and LOCK. Changes to any of these settings, except F100 LOCK,
cause the NTS to reset automatically.
After making changes to values in any of these parameters/functions, a confirmation
prompt appears (“Are you sure?”). For safety, the default response to this prompt is
negative. The NTS will not execute the command unless you respond affirmatively by
entering the letter “y” within 10 seconds. Within that time period, any other response,
including no response, results in the NTS canceling the command.

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4.2

Chapter 4: Serial or Telnet I/O Functions

Command List
The following table lists all serial/Telnet commands that are used to operate, administer,
and maintain the NTS. The Utility Port is ready to receive these commands once the
power-up sequence is complete. The F100 series is used mainly to request or set NTS
NET Port parameters. Changing any network parameter causes the NTS to reboot.
Table 4-1: F-Series Function Commands
Command

Function

Parameters

F03

Time/Date Request

MM/DD/YYYYHH:MM:SS

F18

Software Version Request

–
(equivalent to F100 VER)

F36

Network Configuration Entry/Request

EA, IP, SM, G
(equivalent to corresponding F100 commands)

F53

Operating Mode Request

–

F60

Satellite List Request

–

F67

Leap Second Information Request

–

F72

Fault Status Request

–

100Base-T/10Base-T Entry/Request

10, 100

F100 BASET

(change requires confirmation within 10 seconds)

F100 DHCP

DHCP Control

ENABLE/DISABLE
(change requires confirmation within 10 seconds)

F100 EA

Ethernet Address

–

F100 IP

IP Address

### ### ### ###
(change requires confirmation within 10 seconds)

F100 SM

Subnet Mask

### ### ### ###
(change requires confirmation within 10 seconds)

F100 G

Default Gateway

#### #### #### ####
(change requires confirmation within 10 seconds)

F100 IC

Network Configuration Request

IP, SM, G

F100 P

Password Change Request

XXXXXXX

F100 ST

Self Test Results Request

–

F100 VER

Software Version Request

–

NTP and SNMP Configuration

“GET” , “SET”, “NTP”, “SNMP”, “IP
ADDRESS”, “YES”, “NO”, “W”, “R”

F100 CONFIG

(change requires confirmation within 10 seconds)

F100 LOCK

Remote Lockout

LOCK
(change requires confirmation within 10 seconds)

F100 UNLOCK
F100 L

NTS-150Ch1.fm Rev. G

Disable Remote Lockout

UNLOCK

Lock Display Request

–

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Chapter 4: Serial or Telnet I/O Functions

Command List

Additional F100 Extended Function commands are available for updating software,
changing passwords, pinging remote units, and obtaining UTC time in seconds.
Table 4-2 F-Series Additional F100 Extended Function Commands
Command
F100 J

Parameters

Jumper Setting Request

–

F100 BH

Burn Host

FTP host address, file path, file name

F100 BU

Burn

–

F100 BUB

Burn BootLoader

–

F100 BF

Burn File System

–

F100 BL

Burn Host Lock Request

–

F100BLS

Burn Host Lock Set

(change requires confirmation within 10 seconds)

F100 BLR

Burn Host Lock Reset

(change requires confirmation within 10 seconds)

Reboot

–

F100 PN

Password System User Name Change

XXXXXXX

F100 PR

Password Reset

(change requires confirmation within 10 seconds)

Password Reset All

(change requires confirmation within 10 seconds)

Password Lock Request

–

F100 PLS

Password Lock Set

(change requires confirmation within 10 seconds)

F100 PLR

Password Lock Reset

(change requires confirmation within 10 seconds)

F100 PI

Ping Request

IP Address

F100 PT

Time Request

–

F100 K I L L

F100
PRESETALL
F100 PL

34

Function

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Chapter 4: Serial or Telnet I/O Functions

Function commands and NTS responses contain common elements which are defined in
the following table:
Table 4-3: Definitions of Common Elements in Serial Commands and Responses
Element


±

NTS-150Ch1.fm Rev. G

Definition
Line terminator, a carriage return (0x0D) and line feed (0x0A)
One or more separator characters: either space (0x20), comma
(0x2C), or tab (0x09)
Either no character, + (0x2B), or - (0x2D)



Two digit hour, 0-23



Two digit minutes, 0-59



Two digit seconds, 0-59



Four Digit Year, 0-9999



Two Digit Day of month, 1-31



Three Digit Day of Year, 1-366



Two Digit Month, 1-12



ASCII Start-of-Header character (HEX 01).



Three Digit milliseconds

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Chapter 4: Serial or Telnet I/O Functions

Function Commands

4.3

Function Commands

4.3.1

F03 – Time and Date Request

Use Function F03 to request time and date. The response is UTC date and time.
To request TIME AND DATE, send the following command:
F03

The NTS responds:
F03/
/::

where
F
03


/



:


;



=
=
=
=
=
=
=
=
=
=
=
=
=
=

ASCII character F
function number
space
one- or two-digit month
ASCII character slash
one- or two-digit day
four-digit year (if you manually entered this data)
one- or two-digit hours
ASCII character for a colon
two-digit minutes
two-digit seconds
replacement character
input line terminator
output line terminator

Sample Entry:

F03

The response might be:

F03 UTC 01/07/1996 02:48:29

Year entries less than 10 will be displayed as a single digit. For example, 12\12\1 is
read: December 12, 2001.
4.3.2

F18 – Software Version Request

Use Version Request to query the software version number of the NTS. The version
number is factory set and cannot be changed. This command is for backwards
compatibility and is identical to the F100 VER command (see page 48).

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4.3.3

Chapter 4: Serial or Telnet I/O Functions

F36 – NET Port Network Configuration Entry/Request

Use Function F36 to request or set network parameters. Changes require the NTS to reset.
F36 commands are for backward compatibility and are identical to the F100 function
command series used for the same purpose (see the sections starting on page 41).
F36 commands are for backward compatibility with previous Symmetricom products. F36
and F100 commands can both be used to query or change specific NET Port network
parameters.

The F36 EA (and F100 EA) command reports in the Ethernet address IEEE format, which may
result in numbers which differ from those reported by your system. Since the Ethernet address
is a fixed value, as long as the unit is up and running (you can ping the NTS to be sure), you can
safely ignore these differences.

4.3.4

F53 – Operating Mode Request

Use Function F53 to verify the number of satellites currently being tracked. F53 also
reports the unit’s operating mode, which is always Survey Static.
To see the number of tracked satellites, send the following command:
F53

The NTS responds:
F53:<#>SATS

where
F
53


:
<#>


Sample entry:
The response might be:

NTS-150Ch1.fm Rev. G

=
=
=
=
=
=
=
=

ASCII character F
function number
space
SURVEY STATIC
ASCII colon
number of satellites being tracked
input line terminator
output line terminator

F53
F53 SURVEY STATIC SATS: 6

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Chapter 4: Serial or Telnet I/O Functions

4.3.5

Function Commands

F60 – Satellite List Request

Use Function 60 to list current satellites and to see the relative signal strength of satellites
the NTS is tracking. Signal strength is given in units in the range of 0 to +25.
The NTS monitors five variables: the PRN number, good/bad, enabled/disabled, tracked,
and current.
To request the list, send the following command:
F60

where
F
60


=
=
=

ASCII character F
function number
input line terminator

The NTS responds:
F60prn NNgoodenabledtrackedcurrent
siglevel= +

where

38

prn NN

=

enabled/disabled

=

good/bad

=

tracked

=

current

=



=

pseudo-random number; the prn number is a unique
identifier for a particular satellite’s communication
path; for example, satellite 3 might have the prn
number 15; if that satellite is recalled to Earth and
replaced by satellite 42, the communication path of
satellite 42 might also be assigned prn 15
“Enabled” refers to a factory default configuration
value that allows the GPS to track all satellites on
the F60 list
“Good” means all three of the following apply:
• the satellite is visible, and
• the satellite’s ephemeris and almanac data report
the satellite’s health as “good”, and
• the satellite reports its own health as “good”
“Bad” means at least one of the following applies:
• the satellite is not visible, or
• the satellite’s ephemeris and almanac data report
the satellite’s health as “bad”, or
• the satellite reports its own health as “bad” (for
example, during maintenance periods)
“Tracked” means that the NTS is tracking this
particular satellite
“Current” means that the NTS is both tracking this
satellite and using the satellite’s communication to
calculate accurate time; an example from the list is
prn 3
line terminator

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Chapter 4: Serial or Telnet I/O Functions

You can see from the sample list below that “enabled”, “good”, and “tracked” satellites are
“current”. That means that the NTS does not use any satellite with questionable
communication to calculate time, even if that satellite is enabled, visible and being
tracked.
Sample entry:

F60

The response is a current list, an example of which is:
F60
F60
F60
F60
F60
F60
F60
F60
F60
F60
F60
F60
F60
F60
F60
F60
F60
F60
F60
F60
F60
F60
F60
F60
F60
F60
F60
F60
F60
F60
F60
F60

NTS-150Ch1.fm Rev. G

prn
prn
prn
prn
prn
prn
prn
prn
prn
prn
prn
prn
prn
prn
prn
prn
prn
prn
prn
prn
prn
prn
prn
prn
prn
prn
prn
prn
prn
prn
prn
prn

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32

bad
bad
good
bad
bad
good
bad
bad
bad
bad
bad
bad
bad
bad
good
bad
good
bad
bad
bad
good
good
good
bad
bad
good
bad
bad
good
bad
good
bad

enabled
enabled
enabled
enabled
enabled
enabled
enabled
enabled
enabled
enabled
enabled
enabled
enabled
enabled
enabled
enabled
enabled
enabled
enabled
enabled
enabled
enabled
enabled
enabled
enabled
enabled
enabled
enabled
enabled
enabled
enabled
enabled

tracked current

tracked

tracked current

tracked
tracked current
tracked current
tracked

tracked current
tracked current

NTS-150 User’s Manual

sig
sig
sig
sig
sig
sig
sig
sig
sig
sig
sig
sig
sig
sig
sig
sig
sig
sig
sig
sig
sig
sig
sig
sig
sig
sig
sig
sig
sig
sig
sig
sig

level= +0.00
level= +0.00
level=+13.64
level= +0.00
level= +0.00
level= +0.00
level= +0.00
level= +0.00
level= +0.00
level= +0.00
level= +3.00
level= +0.00
level= +0.00
level= +0.00
level=+22.77
level= +0.00
level= +0.00
level= +0.00
level= +0.00
level= +3.00
level=+20.15
level= +0.00
level=+15.27
level= +0.00
level= +3.47
level= +0.00
level= +0.00
level= +0.00
level=+21.46
level= +0.00
level=+18.10
level= +0.00

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Chapter 4: Serial or Telnet I/O Functions

4.3.6

Function Commands

F67 – Leap Second Information

Use Function 67 to retrieve information regarding upcoming leap seconds. This is
satellite information and cannot be changed through the NTS. Although UTC leap second
adjustments may be performed on four occasions annually, in practice they are only
performed twice: June 30th and December 31st.
To return the leap second status, send the following command:
F67

where
F
F



=
=
=
=

ASCII character
function number
input line terminator
output line terminator

An example of the response might be:
F67 06/30/96 +1 

This response indicates there is a leap second addition during the last minute of
June 30, 1996.
If there was no leap second pending, the response might be:
F67 none 
4.3.7

F72 – Fault Status Request

Use Function F72 to display the status of the antenna feed circuit, and GPS lock status
fault detectors within the NTS.
To display the status of the fault detectors, send the following command:
F72

The NTS responds:
F72Antenna:  GPS: 

where:
F
72




Sample entry:
The response might be:

40

=
=
=
=
=
=

ASCII character F
function number
space
OPEN, GOOD or SHORTED
LOCKED, UNLOCKED
output line terminator

F72
F72 Antenna: OK

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Chapter 4: Serial or Telnet I/O Functions

Extended Function Commands
The F100 command series is known collectively as Extended Function Commands. With
certain F100 commands, you can reconfigure network parameters, such as IP Address, or
modify function settings like Remote Lockout. The main commands include F100
BASET, IP / SM / G / CONFIG (“set” commands) / DHCP, LOCK, UNLOCK and L.
Changes to any of these settings, except F100 LOCK, cause the NTS to reset
automatically after you respond to a confirmation prompt. Other commands are available
for changing passwords (PN, PR, PRESETALL, PL, PLS, PLR) and updating software (J,
BH, BU, BUB, BF, BL, BLS, BLR), as well as pinging remote hosts (PI) and displaying
UTC time in seconds (PT).
For safety, the default response to the confirmation prompt is negative. The NTS will not
execute the command unless you respond affirmatively (enter the letter “y”) within 10
seconds. Within that time period, any other response, including no response, results in the
NTS canceling the command.
In those sections below where it is not already stated,  = input line terminator
and  = output line terminator.
F100 Command Configuration Notes:
• Network parameters can be queried at any time, but cannot be changed unless DHCP is
disabled first.
• You can reconfigure two or more network parameters in a single entry by sending the F100
command and entering new values. You will have to respond (within 10 seconds) to separate
confirmation prompts for each value that you change.
• Leading zeros may be omitted when entering IP Address, Subnet Mask, and Default
Gateway.
• Any field may be omitted and order is not significant.
• Blanks are allowed on either side of a colon.
• The NTS reboots after any network parameter is changed.

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4.4.1

Extended Function Commands

F100 BASET – 100 BASE-T/10 BASE-T Control

Use the BASET command to query the current Base-T setting. If you set the NTS to
10Base-T, it operates only at that speed. If you set the NTS to 100Base-T, it negotiates
between 10/100Base-T. This does not necessarily mean the NTS will connect at
100Base-T, but will connect at the fastest possible speed. Any change to the current
Base-T setting causes the NTS to reset.
To query the maximum Base-T speed, send the following command:
F100BASET

where
F
100

BASET


=
=
=
=
=

ASCII character F
NTS function number
space
specify Base-T command
input line terminator

An example of the response is:
F100 BASET 100T

To set the maximum connection speed to 100Base-T, send the following command:
F100BASET100

where:
100

=

set maximum Base-T speed to 100

To set the maximum connection speed to 10Base-T, send the following command:
F100BASET10

where
10

=

set maximum Base-T speed to 10

In both these cases, the NTS responds:
Are you sure? (y/N)

As a safety feature, after sending this command, you have 10 seconds to respond
affirmatively (enter the letter “y”) to the confirmation prompt, after which the NTS
executes the command and resets. Within that 10 second time period, any other response,
including no response, results in the NTS canceling the command.
For details about an initial 100Base-T setting, see “NET Port Network Parameters: First
Time Configuration” on page 18.

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Chapter 4: Serial or Telnet I/O Functions

F100 DHCP – DHCP Control

Use F100 DHCP to enable or disable Dynamic Host Configuration Protocol. DHCP
allows the NTS to auto-configure its network address, provided that you have enabled
DHCP, and that the unit is installed on, and connected to at power-up, an Ethernet LAN
with a DHCP server. If these conditions are not met, the NTS reverts to those network
parameters in use at the last power-down. By default, DHCP is off at initial installation.
Disable DHCP before changing any Network parameter. Changing DHCP status causes a
software reset of the NTS. DHCP status can be queried without rebooting the unit.

To enable DHCP, send the following command:
F100DHCPENABLE

where:
F
100

DHCP
ENABLE


=
=
=
=
=
=

ASCII character F
NTS function number
space
specify DHCP command
command DHCP to be enabled
input line terminator

To disable DHCP, send the following command:
F100DHCPDISABLE

where:
DISABLE

=

command DHCP to be disabled

The NTS responds:
Are you sure? (y/N)

As a safety feature, after sending this command you have 10 seconds to respond
affirmatively (enter the letter “y”) to the confirmation prompt, after which the NTS
executes the command and resets. Within that 10 second time period, any other response,
including no response, results in the NTS canceling the command.
To query the status of DHCP send:
F100DHCP

An example of the response is:
F100 DHCP OFF

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4.4.3

Extended Function Commands

F100 EA – Ethernet Address

The Ethernet address is assigned at the factory. It is a fixed, six-byte, hexadecimal value
specific to the NTS NET Port. The first three bytes are registered to Symmetricom, Inc.;
the last three bytes are the hex value identifying the NET Port.
To request the Ethernet address of the NTS NET Port, send the following command:
F100 EA

The NTS responds:
F100 EA:00-A0-69-xx-xx-xx

where “xx-xx-xx” are the six hex digits of the unit’s unique address.
An example of the response is:
F100 EA:00-A0-69-00-06-2A

Attempts to set this field will be rejected with a syntax error message.
The F100 EA (and F36EA) command reports in the Ethernet address IEEE format, which may
result in numbers which differ from those reported by your system. Since the Ethernet address
is a fixed value, as long as the unit is up and running (you can ping the NTS to be sure), you can
safely ignore these differences.

4.4.4

F100 IP – IP Address

To obtain the IP address of the NTS NET Port, send the following command:
F100 IP

The NTS responds:
F100 IP:nnn.nnn.nnn.nnn

where “nnn.nnn.nnn.nnn” is the dotted decimal address notation.
An example of the response is:
F100 IP:206.54.0.33

Changing the IP Address requires the NTS to reset. A verification prompt appears
prior to execution.
To set the IP address and restart the NTS, send the following command:
F100 IP:nnn.nnn.nnn.nnn

Sample entry:
The response is:

F100 IP:206.54.0.21
Are you sure? (y/N)

As a safety feature, after sending this command, you have 10 seconds to respond
affirmatively (enter the letter “y”) to the confirmation prompt, after which the NTS
executes the command and resets. Within that 10 second time period, any other response,
including no response, results in the NTS canceling the command.

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Chapter 4: Serial or Telnet I/O Functions

F100 SM – Subnet Mask

To return the subnet mask of the NET Port, send the following command:
F100 SM

The NTS responds:
F100 SM:nnn.nnn.nnn.nnn

An example of the response is:
F100 SM:255.255.255.125

Changing the Subnet Mask requires the NTS to reset. A verification prompt appears
prior to execution.
To set the subnet mask and restart the NTS, send the following command:
F100 SM:nnn.nnn.nnn.nnn

Sample entry:
The response is:

F100 SM:255.255.255.240
Are you sure?(y/N)

As a safety feature, after sending this command, you have 10 seconds to respond
affirmatively (enter the letter “y”) to the confirmation prompt, after which the NTS
executes the command and resets. Within that 10 second time period, any other response,
including no response, results in the NTS canceling the command.
4.4.6

F100 G – Gateway

To obtain the Default Gateway of the NTS NET Port, send the following command:
F100 G

The NTS responds:
F100 G:nnn.nnn.nnn.nnn

An example of the response is:
F100 G:206.54.0.1

Changing the Default Gateway requires the NTS to reset. A verification prompt
appears prior to execution.
To set the Default Gateway and restart the NTS, send the following command:
F100 G:nnn.nnn.nnn.nnn

Sample entry:
The response is:

F100 G:206.54.0.17
Are you sure?(y/N)

As a safety feature, after sending this command, you have 10 seconds to respond
affirmatively (enter the letter “y”) to the confirmation prompt, after which the NTS
executes the command and resets. Within that 10 second time period, any other response,
including no response, results in the NTS canceling the command.

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4.4.7

Extended Function Commands

F100 IC – NET Port Network Configuration Entry/Request

To review the entire NET Port network configuration, send the following command:
F100IC

An example of the response is:
F100 IP:206.54.0.21 SM:255.255.255.240
G:206.54.0.17N:E

where N:E denotes Ethernet DIX.
4.4.8

F100 P – Change User Password

If you want to change a password, you must log in as the user for whom you want to
change the password (also see page 67). The maximum password size is ten characters.
To change the user password, send the following command:
F100P

where:
F
100

P


=
=
=
=
=

ASCII character F
NTS function number
space
specify Password command
input line terminator

The NTS responds:
Enter new user password:

When you enter a new password, the NTS responds with:
Enter it again:

Enter the same new password again, to confirm the spelling. If the same new
password has been entered twice, the NTS responds with:
OK

In this case, the new password will be used for the next Telnet login. However, if the
new password is entered differently the second time, the NTS responds with:
ERROR: Passwords do NOT match.

New password rejected.

In this case, the old password will be used for the next Telnet login.
If you have forgotten your user name and/or password, you can go into bootloader mode
and reset them. In bootloader mode the unit recognizes the default user name and
password. You can then use F100 PR (see page 62) or F100 PRESETALL (see page 61) to
change the user name and password to defaults for use in the normal mode, or you can use
F100 PN (see page 62) and F100 P (the above command) to change the user name and
password to whatever you want. Then you can go back into normal mode the and the user
name and password you just set will work.

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Chapter 4: Serial or Telnet I/O Functions

F100 ST – Self Test Status

Use Self Test Status to query the status of the power-up tests. The response contains the
PASS/FAIL status of the flash memory checksum test, RAM test, Utility Port test, and
version check.
To query the self-test status, send the following command:
F100ST

where:
F
100

ST


=
=
=
=
=

ASCII character F
NTS function number
space
specify ST command
input line terminator

The NTS responds:
F100STFLASH/CRC:,RAM:
,SERIAL:,VER:


where:
F
100

ST
FLASH/CRC
RAM
SERIAL
VER

=
=
=
=
=
=
=
=


,
:


=
=
=
=

ASCII character F
NTS function number
space
specify ST command
specify flash checksum result
specify RAM test result
specify Utility Port test result.
specify version test result. This test compares the
version of the code against the version recorded in
Non-Volatile memory
is either ASCII PASS or FAIL
ASCII comma
ASCII colon
output line terminator

An example of the response is:
F100 ST flash/CRC : PASS, Ram : PASS, Serial : PASS, Ver :
PASS

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4.4.10

Extended Function Commands

F100 VER – Software Version Request

Use Version Request to obtain the software version number of the NTS. The version
number is set at compile time, and cannot be changed. It may only be queried.
To query the version number send the following command:
F100VER

where:
F
100

VER


=
=
=
=
=

ASCII character F
NTS function number
space
specify Version Request command
input line terminator

An example of the response is:
>f100 ver
f100 VER
BOOTLOADER
SOFTWARE
FILE SYSTEM
NVRAM VER

48

182-9023v008
182-9024v008
182-9005v008
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Chapter 4: Serial or Telnet I/O Functions

F100 CONFIG – FTP Configuration of NTP & SNMP

Change the NTP and SNMP parameters contained in the temp/ directory through FTP
and a text editor.
For more information about NTP and NTP broadcast mode, see page 73 and page 79. For
details on SNMP, see page 87.
Installing and Using FTP Software

If you choose the F100 CONFIG option, you need an FTP server, which is any server that
supports Anonymous FTP. If you do not have an FTP server available, you can turn your
own Windows workstation into an FTP server by running any ftp daemon software that is
available on the Web. Follow the instructions that come with your ftp daemon software to
set it up. The software needs to allow anonymous login and allow uploads.
Once the software is set up you can login to the NTS through a serial/Telnet interface.
To configure NTP and SNMP parameters, use “get” and “set” commands. Both these
commands have the same general format:
F100CONFIGHOST:
DIR:

where:
F
100

CONFIG


=
=
=
=
=


=

=
DIR:
=


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=

ASCII character F
NTS function number
space
specifies configuration command
specifies the action to be taken: either GET to
retrieve data from the NTS, or SET to send the
modified data back to the NTS
specifies the type of file to be used, NTP or SNMP
your IP Address (the FTP host)
the directory on your C drive where you want the
data to reside.
input line terminator

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Extended Function Commands

Use a “get” command to retrieve data from the NTS and have it delivered, through the
FTP software, to a specified directory on your C drive. You must use the UNIX format
with forward slashes to specify your IP address and the target directory. The FTP software
delivers the data in a configuration file. Once this file is in the directory, use any text
editor to modify it.
In a “get” command line, you can enter the elements “ntp”, “snmp”, and “get” in any order. If
you want to configure both NTP and SNMP at the same time, place both elements in the
command line.

Use a “set” command to transfer the modified data from the configuration file in your
directory back to the NTS. Once again, you must specify your IP address and the
directory on your hard drive that contains the configuration file. “Set” commands cause
the NTS to reboot. A confirmation prompt appears, to which you must respond
affirmatively (“y”) within 10 seconds, before the NTS executes the command and resets.
In a “set” command line, you can enter the elements “ntp”, “snmp”, and “get” in any order. If
you want to configure both NTP and SNMP at the same time, place both elements in the
command line.

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Configuration of NTP Parameters Using FTP

To configure NTP parameters using FTP and a text editor, follow the steps outlined below.
During this process, the FTP software creates default configuration files (“ntp.conf” and
“ntp.keys”) in your directory to hold the data you have requested. Do not change the
names of these files.
The NTS-150 does not support NTP client mode. Any “server” settings in ntp.conf will be
ignored.

1. Send a “get” command: F100 config get ntp host:192.168.1.14
dir:temp

The NTS responds:

Host config ip 192.168.1.14 configured
successfully!
Source file/etc/ntp.conf bytes read: 70
Dest File temp/ntp.conf bytes written: 70
Source file/etc/ntp.keys bytes read: 70
Dest File temp/ntp.keys bytes written: 70
Configuration files transferred successfully!

An example “ntp.conf” file might look like:
# Note= ALL servers are optional. If your GPS antenna is
connected and positioned correctly, the servers listed here are
not used. These servers are used only when the GPS unit fails.
GPS failure is detected automatically. Note that when the NTS is
using these timeservers the system is, at best, running with 20
millisecond precision. Up to 10 NTP servers can be assigned in
this file. The addresses below are examples, and should be
changed as required by your network configuration.
The following are public Symmetricom NTP Timeservers. Uncomment
one or both to enable NTP fallback to Symmetricom if GPS
synchronization is lost. Add any other server address.
#
server
206.54.0.20
server
206.54.0.21
Private time servers (example only).
server

192.168.1.35

# Uncomment the "broadcast" line below to enable NTP broadcast
mode with MD5
# using key 1. The key may be omitted, but is less secure. If a
key is used here, a corresponding entry for that key must appear
in the NTP key file. A maximum of 20 keys for broadcast can be
defined on this line.
broadcast

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The line below lists the currently trusted keys. See the NTP keys
file for the actual keys and their corresponding key numbers.
Keys 1 and 2 are listed as an example. All keys listed must
appear in the NTP keys file. Note= to ensure maximum security,
remember to change the keys on a regular basis. A maximum of 20
trusted keys can be defined on this line.
trustedkey

1

2

2. Edit the data in the “ntp.conf” file by adding or renaming servers from this list.
3. Edit the data in the “ntp.keys” file (see below).
4. Return the revised data to the NTS by sending a “set” command:
F100 config set ntp host:192.168.1.14
dir:temp

The NTS responds:

Are you sure? (y/N)

If you answer “y”, the NTS responds as follows, then resets:
Source file temp/ntp.conf bytes read: 70
Dest File/etc/ntp.conf bytes written: 70
Source file temp/ntp.keys bytes read: 70
Dest File/etc/ntp.keys bytes written: 70
Configuration files transferred successfully!

As a safety feature, after sending this command, you have 10 seconds to respond
affirmatively (enter the letter “y”) to the confirmation prompt, after which the NTS
executes the command and resets. Within that 10 second time period, any other response,
including no response, results in the NTS canceling the command.
When sending a “set” command, the last number in the NTS response (“70” in this example)
represents file length. Depending on the parameters you configure, this number may vary.

Editing the MD5 keys on the NTP Server

NTP keys are needed if you are using NTP in broadcast mode with MD5 authentication.
This (and the following) section provide configuration guidelines. For a discussion of
using NTP in broadcast mode without MD5 authentication, see Appendix B.
The Broadcast mode adjusts its periodicity according to feedback from its broadcast
client. The periodicity will typically settle-out to about every 2 minutes. This activity is
not adjustable.
MD5 private keys have to be edited on both the NTP server and the NTP client. The
private keys are defined in the “ntp.keys” file.

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The NTP client “ntp.keys” file is identical to the one on the NTP server. For the specific
keys used by the NTP server, the NTP client must have the identical line in its version of
the file. You’ll want to use your own hard-to-guess key names, using random letters. The
critical lines of the “ntp.keys” file are:
Id
---1
2

M
Value
--- -------M
truetime
M
xyz123

where 1 and 2 are key identifiers.
The first column is the key identification number, which may range in whole positive
numbers from 1 to 65,535. The second column is the type of key, which is always set to
the letter M when using MD5 authentication. The third column is the private key that is
ASCII text from 1 to 32 characters in length.
For maximum security, use a unique combination of 32 letters and numbers for each key
identifier. For correct configuration, do not use zero as a key identifier. Zero means the key
identification will not be used.

Editing the MD5 keys on the NTP Client

For NTP client authentication, the line trustedkey 1 2 in the “ntp.conf” file is required
to enable the private keys 1 and 2 from the “ntp.keys” file. The line bclient is required
for broadcast time packets to be processed by the NTP client. In this case, sample
information from a client “ntp.conf” file might look like:
trustedkey

1

2

bclient

Sample information in a client “ntp.keys” file might look like:
1

M

truetime

2

M

longshot

When you invoke the NTP client at the command line, use the following options:
• –b
to turn on broadcast reception
• –k /etc/ntp.keys
to specify the name and location of the keys file
• –d
for debugging.
An example command line might look like:
ntpd –d –d –d –b

–k /etc/ntp.keys

After configuring all MD5 keys, carry out step 4 in the configuration procedure outlined
above.

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Configuration of SNMP Parameters Using FTP

By default, SNMP is disabled. To use it, or to configure any other SNMP parameter using
FTP and a text editor, follow the steps outlined below. During this process, the FTP
software creates a default configuration file (“snmp.conf”) in your directory to hold the
data you have requested. Do not change the name of this file.
1. Send a “get” command:
Sample Entry:

F100 config get snmp host:192.168.1.14
dir:temp

The NTS responds:

Source file /config/snmp.conf bytes read: 1274
Dest File temp/snmp.conf bytes written: 1274
Configuration files transferred successfully!

An example “snmp.conf” file might look like the following, with each string
appearing as a single line on your screen:
MIB=/config/ttmib.o,
GenTraps=NO,
sysContact=Symmetricom Inc. 707-528-1230,
sysName=NTS-150,
sysLocation=Santa Rosa CA 95407,
NAME=public,VIND=1,TRAP=YES,ACCESS=R,IP=192.168.001.230,
IP=192.168.1.129,IP=000.000.000.000,IP=000.000.000.000,ENDC,
NAME=private,VIND=1,TRAP=YES,ACCESS=W,IP=000.000.000.000,
IP=000.000.000.000,IP=000.000.000.000,IP=000.000.000.000,ENDC,
NAME=,VIND=0,TRAP=NO,ACCESS=R,IP=000.000.000.000,
IP=000.000.000.000,IP=000.000.000.000,IP=000.000.000.000,ENDC,
NAME=,VIND=0,TRAP=NO,ACCESS=R,IP=000.000.000.000,
IP=000.000.000.000,IP=000.000.000.000,IP=000.000.000.000,ENDC,
NAME=,VIND=0,TRAP=NO,ACCESS=R,IP=000.000.000.000,
IP=000.000.000.000,IP=000.000.000.000,IP=000.000.000.000,ENDC,
NAME=,VIND=0,TRAP=NO,ACCESS=R,IP=000.000.000.000,
IP=000.000.000.000,IP=000.000.000.000,IP=000.000.000.000,ENDC,
NAME=,VIND=0,TRAP=NO,ACCESS=R,IP=000.000.000.000,
IP=000.000.000.000,IP=000.000.000.000,IP=000.000.000.000,ENDC,
NAME=,VIND=0,TRAP=NO,ACCESS=R,IP=000.000.000.000,
IP=000.000.000.000,IP=000.000.000.000,IP=000.000.000.000,ENDC,
NAME=,VIND=0,TRAP=NO,ACCESS=R,IP=000.000.000.000,
IP=000.000.000.000,IP=000.000.000.000,IP=000.000.000.000,ENDC,
NAME=,VIND=0,TRAP=NO,ACCESS=R,IP=000.000.000.000,
IP=000.000.000.000,IP=000.000.000.000,IP=000.000.000.000,ENDC,
END

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where:
MIB

=

for future use only

GenTraps

=

switches on/off all traps

sysContact,
sysName, and
sysLocation

=

standard MIB II variables for system name,
location, and contact personnel

NAME, VIND,
TRAP (yes/no),
ACCESS (read/write),
and IP address
=

configurable SNMP community variables

2. Configure any of the following parameters:
• GenTraps: set to “YES” if you want SNMP traps to be generated
If you do not use SNMP on your network, set GenTraps to “NO”.

• Community Names
• Access: “W” for read/write (“R” = read only)
• IP Addresses
3. Return the revised data to the NTS by sending a “set” command:
F100 config set snmp host:192.168.1.14
dir:temp

The NTS responds:

Are you sure? (y/N)

If you answer “y”, the NTS responds:
Source file temp/snmp.conf bytes read: 1274
Dest File /config/snmp.conf bytes written: 1274
Configuration files transferred successfully!

and then resets.
As a safety feature, after sending this command, you have 10 seconds to respond
affirmatively (enter the letter “y”) to the confirmation prompt, after which the NTS
executes the command and resets. Within that 10 second time period, any other response,
including no response, results in the NTS canceling the command.

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4.4.12

Extended Function Commands

F100 LOCK – Remote Lockout

Use Remote Lockout to disable remote control capability and secure the NTS from Telnet
access. You can issue this command from Telnet or the serial port. The default setting is
“Unlocked”. To once again activate remote access via Telnet, you must unlock the unit
using the serial port (see “F100 UNLOCK – Disable Remote Lockout” below).
To lock the NTS to prevent remote access, send the following command:
F100 LOCK

The NTS responds:
Are you sure? (y/N)

If you answer “y” and press Enter, the NTS executes the command.
As a safety feature, after sending this command, you have 10 seconds to respond
affirmatively (enter the letter “y”) to the confirmation prompt, after which the NTS
executes the command and resets. Within that 10 second time period, any other response,
including no response, results in the NTS canceling the command.
If you are using Telnet when you issue this command and answer “y” and press Enter, the
NTS executes the command by saying “Goodbye” and closing the Telnet session.
4.4.13

F100 UNLOCK – Disable Remote Lockout

Use Disable Remote Lockout to enable remote control capability via Telnet. You must
send this command via the serial port.
To unlock the NTS to allow remote access, send the following command:
F100 UNLOCK

The NTS responds:
Are you sure? (y/N)

If you answer “y” and press Enter, the NTS executes the command.
As a safety feature, after sending this command, you have 10 seconds to respond
affirmatively (enter the letter “y”) to the confirmation prompt, after which the NTS
executes the command and resets. Within that 10 second time period, any other response,
including no response, results in the NTS canceling the command.
4.4.14

F100 L – Lock Display Request

Use Lock Display to view the lock setting state for remote Telnet access.
To view the lock setting for remote access, send the following command:
F100 L

An example NTS response:
UNIT_REMOTE_DISABLE_BIT = 0

This example shows that the unit is unlocked (0), so remote access is allowed.

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Important Note:
The following commands related to software upgrades (F100 J, BH, BU, BUB, BF and K I L L)
are not the normal commands used for uploading firmware. Symmetricom provides these
commands for flexibility in supporting special case situations. Normal firmware upgrades use
an easy-to-use upgrade program provided with the firmware.

4.4.15

F100 J - Jumper

Use F100 J to display the state of jumper JP5, which determines if the unit starts in
bootloader mode or normal mode. When this jumper is set to position 1, the NTS boots up
in bootloader mode. When this jumper is set to position 0, the NTS boots up in normal
mode. This function also displays the security flag bits and disable bits. Bootloader mode
can be used to reinstate default user names and passwords if they are forgotten, or install
new software in special cases.
To display the state of jumper J5, send the following command:
F100 J

An example NTS response:
Jumper JP5 = 0
Security flags = 0x00000000
BURN_DISABLE_BIT = 0
UNIT_REMOTE_DISABLE_BIT = 0
PASSWORD_SETTING_DISABLE_BIT = 0

This example shows the jumper set to position 0, and the disable bits at 0 (unlocked).
JP5 is located near the middle of the printed circuit board, beside the two flashing LEDs
and the NetARM microprocessor. To set the jumper to position 1 (bootloader), place it
over the middle pin and the pin closest to the NetARM microprocessor. To set the jumper
to position 0 (default), place it over the middle pin and the pin farthest from the NetARM
microprocessor.
4.4.16

F100 BH - Burn Host

Use Burn Host when upgrading software, to select the FTP host and the file for transfer.
To select the FTP host and file for upgrading, send the following command:
F100 BH /

Use UNIX style forward slashes ‘/’ in path and do not describe the drive (for example, ‘C’) in the p

For example:
F100 BH 10.1.7.20 Lassen/Rel/nts150/192-9004v001.BIN

The NTS responds:
Burn host is ready

When specifying the path to the FTP server from which to retrieve the firmware, the
number of characters can't exceed 40 characters for the full path length.

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This command can be disabled by the Burn Host Lock command, which denies Telnet
access. However, if you enter BootLoader mode, this command is always available.
4.4.17

F100 BU - Burn

Use Burn when upgrading software, to write the file selected with F100 BH to the flash
memory. Flash memory is checked to ensure that the correct file is used.
To write the file to the flash, send the F100 BH command with the FTP host, file
path and name, and then send the following command:
F100 BU

The NTS responds:
Are you sure? (y/N)

If you answer “y” and press Enter, the NTS executes the command.
As a safety feature, after sending this command, you have 10 seconds to respond
affirmatively (enter the letter “y”) to the confirmation prompt, after which the NTS
executes the command and resets. Within that 10 second time period, any other response,
including no response, results in the NTS canceling the command.
NTS example execution:
Burning Prog1
Burning file 182-9004v001.bin with size 688052 to
partition 1: sector :6
Sec: 6 re: 0
Sec: 7 re: 0
Sec: 8 re: 0
Sec: 9 re: 0
Sec: 10 re: 0
Sec: 11 re: 0
Sec: 12 re: 0
Sec: 13 re: 0
Sec: 14 re: 0
Sec: 15 re: 0
Sec: 16 re: 0
Flash successfully programmed CRC32 = 0x88841B88
4.4.18

F100 BUB - Burn BootLoader

Use Burn BootLoader when upgrading software, to write the BootLoader to flash memory.
To write the BootLoader to the flash, send the F100 BH command with the FTP
host, file path and name, and then send the following command:
F100 BUB

The NTS responds:
Are you sure? (y/N)

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If you answer “y” and press Enter, the NTS executes the command.
As a safety feature, after sending this command, you have 10 seconds to respond
affirmatively (enter the letter “y”) to the confirmation prompt, after which the NTS
executes the command and resets. Within that 10 second time period, any other response,
including no response, results in the NTS canceling the command.
NTS example execution:
Burning Boot
Burning file 182-9003v001.BT with size 342860 to
partition 0: sector :0
Sec: 0 re: 0
Sec: 1 re: 0
Sec: 2 re: 0
Sec: 3 re: 0
Sec: 4 re: 0
Sec: 5 re: 0
Flash successfully programmed CRC32 = 0xE3E0ECAE

If more than six flash sectors are written during this process, you must rewrite both the
bootloader sectors (0 to 5) and the program binary sectors (6 to 16).
4.4.19

F100 BF - Burn File System

Use Burn File System when upgrading software, to write a file system to the flash
memory.
To write the file system to the flash, send the F100 BH command with the FTP
host, file path and name, and then send the following command:
F100 BF

The NTS responds:
Are you sure? (y/N)

If you answer “y” and press Enter, the NTS executes the command.
As a safety feature, after sending this command, you have 10 seconds to respond
affirmatively (enter the letter “y”) to the confirmation prompt, after which the NTS
executes the command and resets. Within that 10 second time period, any other response,
including no response, results in the NTS canceling the command.
NTS example execution:
Burning file 182-9005v003.fs with size 524288
Sec: 20
Sec: 21
Sec: 22
Sec: 23
Sec: 24
Sec: 25

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Sec: 26
Sec: 27
Sec: 28

4.4.20

F100 K I L L - Reboot

Use K I L L after upgrading software, to reboot the unit.
K I L L is a case-sensitive command. When entering this command, use all capital letters. You
also must put spaces between each letter.

To reboot the unit, send the following command:
F100 KILL

The NTS responds:
Are you sure? (y/N)

If you answer “y” and press Enter, the NTS executes the command.
As a safety feature, after sending this command, you have 10 seconds to respond
affirmatively (enter the letter “y”) to the confirmation prompt, after which the NTS
executes the command and resets. Within that 10 second time period, any other response,
including no response, results in the NTS canceling the command.
When using F100 K I L L via the Serial Port, pressing Y then Enter will begin the reboot,
which will be logged on the terminal as shown below.
NTS example execution (Serial Port):
System Power On

Self Test Results:

Serial Loopback Test Passed.
...
Initialization Successfully Completed.

Press Enter, then you can log in again.
When using F100 K I L L via Telnet, pressing Y then Enter will begin the reboot, but will
disconnect the Telnet session. Nothing will show on the terminal, and pressing Enter again
will close the screen (if it hasn’t closed automatically already).
4.4.21

F100 BL - Burn Host Lock Request

Use Burn Host Lock to display whether or not software upgrades via Telnet can be
performed.
To display the burn host lock state, send the following command:
F100 BL

An example NTS response:
BURN_DISABLE_BIT = 0

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If the lock is set to 1, upgrading is not possible (the burn host lock has been set). If the lock
is set to 0, upgrading is possible (the burn host lock has been reset). This only effects
Telnet connections; you can always burn from a serial connection.
4.4.22

F100 BLS - Burn Host Lock Set

Use Burn Host Lock Set to prevent unauthorized upgrading of software via Telnet.
To set the burn host lock, send the following command:
F100 BLS

The NTS responds:
Are you sure? (y/N)

If you answer “y” and press Enter, the NTS executes the command.
As a safety feature, after sending this command, you have 10 seconds to respond
affirmatively (enter the letter “y”) to the confirmation prompt, after which the NTS
executes the command and resets. Within that 10 second time period, any other response,
including no response, results in the NTS canceling the command.
NTS example execution:
BURN_DISABLE_BIT = 1
4.4.23

F100 BLR - Burn Host Lock Reset

Use Burn Host Lock Reset to reset the lock and allow software upgrades via Telnet. You
must use the serial port to access this function.
To reset the burn host lock, send the following command:
F100 BLR

The NTS responds:
Are you sure? (y/N)

If you answer “y” and press Enter, the NTS executes the command.
As a safety feature, after sending this command, you have 10 seconds to respond
affirmatively (enter the letter “y”) to the confirmation prompt, after which the NTS
executes the command and resets. Within that 10 second time period, any other response,
including no response, results in the NTS canceling the command.
NTS example execution:
BURN_DISABLE_BIT = 0
4.4.24

F100 PRESETALL - Password Reset All

Use Password Reset All when you want to set passwords back to the factory defaults.
PRESETALL is a case-sensitive command. When entering this command, use capital letters.

To reset all the passwords to factory defaults, send the following command:

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F100 PRESETALL

The NTS responds:
Are you sure? (y/N)

If you answer “y” and press Enter, the NTS executes the command.
As a safety feature, after sending this command, you have 10 seconds to respond
affirmatively (enter the letter “y”) to the confirmation prompt, after which the NTS
executes the command and resets. Within that 10 second time period, any other response,
including no response, results in the NTS canceling the command.
NTS example execution:
Flash memory writing in progress:
Default user name and password set: 2
Default user name and password set: 1
4.4.25

F100 PN - Password System User Name Change

Use Password System User Name when changing the login user name.
To change the login user name, send the following command:
F100 PN

The NTS responds:
User Name Change for xyz123
Enter new user name:

When you enter a new user name, the NTS responds with:
Confirm new user name:

Enter the same new user name again, to confirm the spelling. If the same new user
name has been entered twice, the NTS responds with:
User name change for xyz123 successfully changed

In this case, the new user name will be used for the next Telnet login. However, if the
new user name is entered differently the second time, the NTS responds with:
ERROR: User names do NOT match. New user name rejected.

In this case, the old user name will be used for the next Telnet login.
4.4.26

F100 PR - Password Reset

Use Password Reset when changing the current login user name and password to defaults.
To reset the passwords to factory defaults, send the following command:
F100 PR

The NTS responds:
Are you sure? (y/N)

If you answer “y” and press Enter, the NTS executes the command.
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As a safety feature, after sending this command, you have 10 seconds to respond
affirmatively (enter the letter “y”) to the confirmation prompt, after which the NTS
executes the command and resets. Within that 10 second time period, any other response,
including no response, results in the NTS canceling the command.
NTS example execution:
Default user name and password set : 2
4.4.27

F100 PL - Password Lock Request

Use Password Lock to view the password changing lockout setting for Telnet sessions.
To display the password lockout state, send the following command:
F100 PL

An example NTS response:
PASSWORD_SETTING_DISABLE_BIT = 0

If the lock is set to 1, changing the password is not possible (the password lock is set). If
the lock is set to 0, changing the password is possible (the password lock has been reset).
4.4.28

F100 PLS - Password Lock Set

Use Password Lock Set to lockout setting of passwords via Telnet.
To inhibit password changes, send the following command:
F100 PLS

The NTS responds:
Are you sure? (y/N)

If you answer “y” and press Enter, the NTS executes the command.
As a safety feature, after sending this command, you have 10 seconds to respond
affirmatively (enter the letter “y”) to the confirmation prompt, after which the NTS
executes the command and resets. Within that 10 second time period, any other response,
including no response, results in the NTS canceling the command.
NTS example execution:
PASSWORD_SETTING_DISABLE_BIT = 1
4.4.29

F100 PLR - Password Lock Reset

Use Password Lock Reset to allow setting of passwords via Telnet.
To allow password changes, send the following command:
F100 PLR

The NTS responds:
Are you sure? (y/N)

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If you answer “y” and press Enter, the NTS executes the command.
As a safety feature, after sending this command, you have 10 seconds to respond
affirmatively (enter the letter “y”) to the confirmation prompt, after which the NTS
executes the command and resets. Within that 10 second time period, any other response,
including no response, results in the NTS canceling the command.
NTS example execution:
PASSWORD_SETTING_DISABLE_BIT = 0
4.4.30

F100 PI - PING

Use F100 PI to ping a remote host to see if it is reachable.
To ping a host, send the following command:
F100 PI

For example:
F100 PI 206.254.000.021

An example NTS response:
PING: Remote Host Reachable.
4.4.31

F100 PT - Time

Use F100 PT to display UTC time in seconds.
To see UTC time in seconds, send the following command:
F100 PT

An example NTS response:
UTC: 990467862
4.4.32

F100 QR - Quiet Reset

On very small number of NTS units, the network port sometimes locks up and stops
receiving TCP/IP packets. The quiet reset function automatically detects this condition
and resets the NTS to clear this condition. F100 QR also provides the option to suppress
SNMP traps for a user-specified period after a quiet reset. (Note: SNMP traps operate
normally when the unit is reset for any other reason).
To query Quiet Reset, enter:
>F100 QR

The unit replies:
Quiet Reset:
Mode on
Quiet Reset
Ethernet Recv Inactivity Timeout
SNMP no Traps Sent Period

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=
=
=

0
0
1200
900

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Total Number of Quiet Resets

= 0

Where:
Mode on
Quiet Reset

=
=

Ethernet Recv Inactivity Timeout =

SNMP no Traps Sent Period

=

Total Number of Quiet Resets

=

0 = off, 1 = on
0 = quiet reset not pending,
1 = quiet reset about to happen.
 = the number of seconds without
Ethernet packet activity before
automatically resetting the unit. 1200
seconds (20 minutes) is the factory default.
User selectable value. Minimum is 300
seconds (5 minutes). The maximum value
is 4294967295.
 = the number of seconds the unit
suppresses SNMP traps after a quiet reset.
The factory setting is 900 seconds (15
minutes). The minimum value is 0
seconds. (A value of 0 means that SNMP
traps will be sent immediately after a quiet
reset mode.) The maximum value is
4294967295.
Tallies the number of quiet resets. This
number accumulates indefinitely and wraps
back to 0. Use this number by examining it
at a particular time and recording the value
seen. After some period of time later,
record this number again. The difference
between the two periods is the number of
quiet resets between those two periods of
time. For those people familiar with
SNMP, this value acts exactly like the
familiar counting variables. This parameter
is not user selectable but for information
purposes only.

Recommendation: leave the F100 QR settings unchanged except to address the network
port lockup issue, in which case, enable F100 QR.
To enable F100 QR, enter:
>f100 qr 1 1200 900

Where 1 enables Mode on, sets Ethernet Recv Inactivity Timeout to 1200, and sets SNMP
no Traps Sent Period to 900.
Confirm the changes by entering:
>f100 qr
Quiet Reset:
Mode on

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Ethernet Recv Inactivity Timeout
SNMP no Traps Sent Period
Total Number of Quiet Resets
4.4.33

=
=
=
=

0
1200
900
0

F100 WG - Write GPS

F100 WG controls the time base the NTS displays and distributes via NTP. The default
setting is UTC. Selecting GPS as the time base removes the current time offset to UTC
and any future leap events.
To see the current value, enter:
F100 WG

To turn the GPS time base on, enter:
F100 WG 1

To turn the GPS time base off and return to distributing UTC, enter:
F100 WG 0

This setting is saved in nonvolatile memory and will be used until changed..
NOTE: Using F100 WG causes the unit to distribute non-standard GPS-based NTP!
Additionally, the F100 WG functionality only exists when the unit is locked to GPS. If the unit
looses GPS lock and selects another reference source (e.g., NTP from the network), the unit
temporarily switches to distributing UTC over NTP, which will most likely introduce a large time
jump (approximately -13 seconds) due to the difference between GPS and UTC. If the unit
reacquires GPS, it will switch back distributing GPS time on NTP.

Login/Logout

4.5

Chapter 4: Serial or Telnet I/O Functions

Login/Logout
There are two levels of login: “operator” and “guest”.

4.5.1

Operator Login

Use the Operator login to run function requests and entries, change settings and perform
software updates. As shipped, you can access the Operator level with:
• User Name:

operator

• Password:

mercury

To maintain security, change the Operator password at installation.
If you are logged in as “operator”, the only serial or Telnet function that you cannot
perform is to change the Guest password.
4.5.2

Guest Login

Use the guest login to view function requests. As shipped, you can access the Guest level
with:
• User Name:

guest

• Password:

truetime

To maintain security, change the Guest password at installation.
If you try to use a function that is not accessible from the guest login, you will see a
message such as Access denied or Command canceled.
4.5.3

Logout

You can logout using any of the standard logout commands, as follows:
• logout
• logoff
• exit
• quit

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5
NTS-Generated Messages
5.1

Error Messages

5.1.1

ERROR 01 VALUE OUT OF RANGE

Meaning:

You have entered a valid command, with an invalid parameter value.

Recovery Action: Re-enter the command, using a valid parameter.
5.1.2

ERROR 02 SYNTAX

Meaning:

You have entered a valid command with a minor syntax error. The
NET Port network interface software has detected the error.

Recovery Action: Re-enter the command, using valid syntax.
5.1.3

ERROR: Invalid Command

Meaning:

You have entered an invalid command.

Recovery Action: Consult the manual for the correct command and re-enter.
5.1.4

ERROR: Can’t create netdevice 

Meaning:

The NTS can not create the device needed to map the host to a drive.

Recovery Action: Restart the Unit. If this error message persists, contact Symmetricom
Technical Customer Service.
5.1.5

ERROR: Can’t set host  ip 


Meaning:

You have incorrectly entered a parameter, or there is no room
currently in the Host table for another IP Address.

Recovery Action: Verify correct parameter values. If correct, restart the NTS. If this
error message persists, contact Symmetricom Technical Customer
Service.

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5.1.6

Error Messages

ERROR: Action (get or set) is not specified

Meaning:

You have omitted the “get” or “set” parameter from the F100 NTP
Configuration command.

Recovery Action: Re-enter the command, specifying the desired action.
5.1.7

ERROR: Can’t open source file 

Meaning:

The file containing the needed data is unavailable.

Recovery Action: Check file location and directory names to verify the path is accurate,
then re-enter the command.
5.1.8

ERROR: Can’t open dest file 

Meaning:

The destination file is unavailable.

Recovery Action: Check file location and directory names to verify the path is accurate,
then re-enter the command.
5.1.9

ERROR: Can’t write file 

Meaning:

Data from the source file cannot be copied to the destination file.

Recovery Action: Check file location and directory names to verify the path is accurate,
then re-enter the command.
5.1.10

ERROR: Configuration failed.

Meaning:

Your attempt to configure new parameters was unsuccessful.

Recovery Action: Verify parameter values, then re-enter the command.
5.1.11

ERROR: Configuration type is not specified

Meaning:

You did not specify the file type.

Recovery Action: Re-enter the command, specifying SNMP and/or NTP.

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5.2

LED System Status Alerts

5.2.1

Solid Red

Meaning:

Solid Red means there is no signal from the time source, or that a
major alarm fault has been detected.

Recovery Action: Check your antenna installation for correct position, obvious
hardware problems, or trouble with lines or wires. If you still need
assistance, contact Symmetricom at (707) 528-1230 or
support@symmetricom.com.
5.3

Informational Messages
Messages in this section inform you of events and do not require any action on your part.

5.3.1

Deleted previously set IP host address

Meaning:
5.3.2

NOTICE: Cannot respond to command because Utility Port session has priority.

Meaning:

5.3.3

Source file was successfully read.

Dest file  bytes written: 
Configuration files transferred successfully!

Meaning:
5.3.6

Host configuration was successful.

Source file  bytes read: 

Meaning:
5.3.5

A Utility Port session has started and takes precedence. Wait until it is
over before logging in or expecting a response to an entered Telnet
command.

Host  ip 
 configured successfully!

Meaning:
5.3.4

Your last action deleted the previously set IP host address.

Information was successfully transferred to the destination file.

Restarting the Unit
Please wait…

Meaning:

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A command has just been executed that requires a soft restart of the
NTS. The restart happens immediately after this message is sent.

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5.3.7

DHCP is enabled

Meaning:
5.3.8

Command accepted and processed as specified.

Goodbye.

Meaning:

72

You have just successfully entered the Disable DHCP command.

OK

Meaning:
5.3.10

You have just successfully entered the Enable DHCP command.

DHCP is disabled

Meaning:
5.3.9

Informational Messages

The NTS has just terminated a session.

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A
Network Time Protocol (NTP) V 3.0 Data Formats

This appendix describes the following two data formats:
• NTP V 3.0 per RFC-1305 (page 74)
• SNTP V 3.0 per RFC-2030 (page 77)
The NTS fully supports NTP version 4.0, (backwards compatible with NTP v.2, RFC-1119, and
v.3, RFC-1305), and SNTP as per RFC 2030.

All RFCs are published with approval of the Internet Activities Board, found on the
Internet by running any search engine and typing "RFC" in the search field (or
“RFC-####” if you have the number).

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NTP V 3.0 Data Format per RFC-1305

A.1

NTP V 3.0 Data Format per RFC-1305

A.1.1

NTP Data Packet

The layout of the NTP data packet information following the UDP header is shown below,
and each element is described on the following pages:

Leap Indicator

Version Number

Mode

Stratum

Poll

Precision

Synchronizing Distance (Root Delay Version 3)
Synchronizing Dispersion (Root Dispersion Version 3)
Reference Clock Identifier
Reference Timestamp
Originate Timestamp
Receive Timestamp
Transmit Timestamp
Authenticator
Figure A-0 NTP Data Packet Information Layout

Leap Indicator

The leap indicator is a 2 bit code that signals an impending leap second to be added or
subtracted in the last minute of the current day. Leap year codes and their corresponding
meanings are shown in Table A-1 below:
Table A-1

Leap Year Codes

Bit 0

Bit 1

Meaning

0

0

Normal Operation

0

1

61 second last minute

1

0

59 second last minute

1

1

Clock not synchronized

The unsynchronized state is indicated by the NTS whenever the estimated synchronization
error is greater than the root dispersion. Such conditions typically occur following
turn-on, until synchronization with the external source has been achieved, and whenever
the external synchronization input has been removed and the extrapolated time error has
exceeded the value of the root dispersion.

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Appendix A: Network Time Protocol (NTP) V 3.0 Data Formats

Version Number

The version number is a three bit integer that specifies the NTP version. The NTS will
copy this field from the client requesting packet and return it in this field if it is equal to
either 2 or 3. NTP version 1.0 packets are not supported.
Mode

The mode is a three bit integer that determines the functions the NTS module will
perform. The NTS module operates in mode four or server mode. Mode four operation
allows the module to synchronize hosts but will not allow the module to be synchronized
by another host.
Stratum

The stratum is an eight bit integer providing the stratum level of the time source. The
NTS-150 module operates in stratum 1, denoting a primary reference.
Poll Interval

The poll interval is a signed eight bit integer used as the exponent of two to yield in
seconds the minimum interval between consecutive messages. For example, a poll
interval value of six implies a minimum interval of 64 seconds. The NTS does not alter
the setting of this field.
Precision

The precision is a signed eight bit integer used as the exponent of two to yield in seconds
the precision of the local time source and any other hardware affecting the base level
“jitter” of the time server. This field is set to approximate the time stamping resolution of
the NTS, which is 10 µs. So the precision byte is set to –16, which is equivalent to a
precision of 15.26 µs.
Synchronizing Distance (Root Delay Version 3)

The root delay is a signed 32 bit fixed point number representing the predicted round-trip
delay in seconds to the primary synchronizing source. The fraction point is between bits
15 and 16. This value is set to 0 seconds in the NTS-150 module.
Synchronizing Dispersion (Root Dispersion Version 3)

The root dispersion is a signed 32 bit fixed point number representing the maximum error
in seconds relative to the primary synchronizing source. This value is a function of the
precision and the quality of the synchronization input option.
When the synchronization input option is GPS, then the NTS will self determine the
accuracy. Once the accuracy has been determined, then the NTS sets the root dispersion
equal to ten times the square root of the sum of the squares of the precision and the
accuracy, except for the ACTS synchronization option, where the root dispersion is set
equal to the accuracy.

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Appendix A: Network Time Protocol (NTP) V 3.0 Data Formats

NTP V 3.0 Data Format per RFC-1305

Reference Clock Identifier

The reference clock identifier is a 32 bit code identifying the particular type of timing
source. Strata 0 and 1 use a four-octet, left justified, zero-padded ASCII string. The
NTS-150 module operates as Stratum 1 and uses this four-octet string based on the local
time source input as shown in Table A-2 below. This setting is determined based on the
NTS synchronization input option.
Table A-2 Local Time Source Input
Local Time Source Input

Reference Identifier String

GPS

"GPS"

NTP

"NTP"

Reference Timestamp

The reference timestamp is a 64 bit timestamp format representing the local time at the
last update. The NTS-150 module’s reference timestamp is the last time that a valid
synchronization source signal was present.
Originate Timestamp

The originate timestamp is a 64 bit timestamp format representing the time that the request
left the client host.
Receive Timestamp

The receive timestamp is a 64 bit timestamp format representing the time that the request
arrived at the service host.
Transmit Timestamp

The transmit timestamp is a 64 bit timestamp format representing the time that the reply
left the service host.
Authenticator

This is a 96-bit field containing the authenticator information as described in Appendix C
of RFC-1305. This field is not implemented by the NTS.

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A.2

Appendix A: Network Time Protocol (NTP) V 3.0 Data Formats

SNTP V 3.0 Data Format per RFC-2030
When the NTS replies to requests from SNTP clients, the packet format is the same as the
NTP packet format described above, with the following differences:
• Leap Indicator
The NTS will set these 2 bits to either 0 (normal) or 3 (unsynchronized) only
• Version Number
The NTS will copy this field from the client request packet and return it in this field.
• Reference Timestamp
This field is set to the time that the reply left the NTS server host.
• Receive Timestamp
This field is set to the time that the reply left the NTS server host.
• Transmit Timestamp
This field is set to the time that the reply left the NTS server host.
• Authenticator
This field is not used in SNTP.

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B
MD5 Authentication and NTP Broadcast Mode
B.1

Introduction to MD5 Authentication Protocol
MD5 is a security protocol that can be used to authenticate NTP client-server
communications, ensuring that a received NTP time packet is free from tampering. For
example, if the server receives an NTP request packet with the wrong MD5 key (i.e., a key
that hasn’t been configured by the user in the NTS), then the server ignores the request. A
similar mechanism exists on the client side. If the client makes a request with a specific
key, and the response does not have the same key, then the client assumes the packet can
not be trusted and discards it.
Symmetricom’s version of MD5 is compatible with all versions of NTP client software
furnished by Dr. David Mills at the University of Delaware. MD5 was drafted into a
standard by MIT Laboratory for Computer Science and RSA Data Security, Inc. MD5
authentication means the information within the NTP packet is guaranteed to be unaltered
and from a user having privileged access. Unlike other cryptographic ciphers, MD5 does
not hide the data within the packet. The MD5 authenticated NTP packet is still readable.
This means MD5 is faster to generate than other cryptographic protocols, and as Dr. Mills
notes, there is no reason to hide the actual time from anyone. Further, MD5 does not
suffer from any export restrictions. You could think of MD5 as a very sophisticated NTP
data checksum that is calculated over the data, socket address, and a private key of an NTP
time packet. It is extremely difficult to reverse generate.
The MD5 cryptographic key identifier and cryptographic message digest are appended to
the end of a normal NTP packet and the two pieces of information are referred to together
as an MD5 signature. The key identifier is the first field in the signature, and it is a 32-bit
integer in the range from 1 to 4294967295 (0xFFFFFFFF) – do not use zero as a key
identifier. This number specifies an index into a table of many possible MD5 keys.
An MD5 key is an ASCII alpha/numeric character string that is from 1 to 32 characters in
length. The key is most secure when all 32 characters are filled with numbers and letters
chosen at random. The ASCII key string is combined with the NTP packet data and
results in a secure message digest.

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Introduction to MD5 Authentication Protocol

The MD5 message digest is 16 bytes in length and it follows the key identifier in the
signature. A server authenticates the NTP packet from a client by first looking up the key
by reference to the key identifier. It then generates the MD5 message digest based on the
key and the NTP data and compares the resulting message digest to the client packet’s
MD5 message digest. If the two compare, a NTP reply packet is generated with a new
MD5 signature. If the MD5 message digests do not agree, then the NTP client packet is
ignored by the Network Time Server.
To use NTP Broadcast mode, you also need the following information:
• Maximum number of user definable MD5 keys in the “ntp.keys” file: 24
• Maximum number of trusted keys that can be defined in an “ntp.conf” file: 20
• Maximum number of keys that can be used in NTP broadcast mode: 20
• Maximum text length of MD5 key value in “ntp.keys” file: 32 ASCII characters
For more technical information on MD5, see the MD5 RFC-1321, NTP RFC-1305, and
the release notes for NTP client software furnished by Dr. David Mills’ web site located at
the University of Delaware at:
http://www.eecis.udel.edu/~ntp
or
http://www.eecis.udel.edu/~ntp/software.html
All RFCs are published with approval of the Internet Activities Board, found on the Internet by r
any search engine and typing "RFC" in the search field (or “RFC-####” if you have the number)

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B.2

Appendix B: MD5 Authentication and NTP Broadcast Mode

NTP Broadcast Mode with MD5 Authentication
An NTP broadcast timeserver with an NTP broadcast time client can be used for NTP
version 4 with authentication.
The MD5 authentication protocol is optionally available for NTP versions 3 and 4. When
a packet is received by NTP, it checks the key identification number in the packet against
the private key in the “ntp.keys” file, then calculates the MD5 digest number and
compares this number to the one sent in the packet. If the digest numbers do not agree,
then the packet is ignored. Thus, only servers with trusted MD5 keys may send time to a
client. The keys are known to both the NTP client and server through separate key files,
usually named “ntp.keys” in the “/etc” directory. The name of the file and its location are
determined by the “–k” option when the NTP program is invoked.
In actual practice, for normal NTP client-to-server communications using explicit IP
addresses with multiple servers, it is not necessary to use MD5. That is because the NTP
client spends a great deal of time filtering out packets with incorrect time. Anyone
attempting to send false time to a NTP client would be discarded. However, when
broadcast time is used, then the client accepts the packet more readily and in this case can
be fooled. The same is true if only one NTP server is used to synchronize an NTP client
and a network attacker substitutes a false NTP server for the good one. Under these
conditions, the NTP client has nothing to judge the time against and, if the false
information is persistent, then the client will be forced to eventually reset its time. In this
case it is worth the extra processing load to use MD5.
Setting up an NTP broadcast server and NTP client using MD5 authentication requires
modifications to the “ntp.keys” file.
Editing MD5 keys is covered in Chapter 4 (see the sections starting on page 52). The
following discussion covers the use of an NTP broadcast timeserver with an NTP
broadcast time client for NTP version 4 without authentication.

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B.3

NTP Broadcast Mode without Authentication

NTP Broadcast Mode without Authentication
Authentication was configured off by default for NTP version 3, but is configured on by
default for version 4. This means that NTP version 4 must use authentication, like MD5,
for broadcast time to work. To have it otherwise, you must specifically turn authentication
off in the “ntp.conf” file of the NTP time client.
The method outlined below should only be used when the LAN that the NTP hosts are on is a
secure network. Otherwise, it is all too easy for an NTP time imposter to broadcast the
incorrect time to the NTP time client.

B.3.1

Configuration of NTP on the Timeserver

For the NTP timeserver, authentication may be on or off - it does not matter. As an
example, here is a sample “ntp.conf” file.
broadcast

192.168.1.255

This file is stored on the Symmetricom timeserver in its Flash disk drive in the “/etc”
directory.
The critical line is: broadcast 192.168.1.255.
• This line turns on the periodic broadcast of NTP time packets to the local LAN.
This IP address (the first three octets: 192.168.1) is a network address.
The LAN portion of the address, the last octet in this case, is set to all ones. You
may use all zeros for most LANs as the LAN address, instead of all ones. This
address allows NTP time packets to be received by all hosts on the local LAN
including the NTP time client. Ask your system administrator what your LAN
broadcast address is for your particular network and substitute it for the address in
this example.

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B.3.2

Appendix B: MD5 Authentication and NTP Broadcast Mode

Configuration of NTP on the Time Client

Authentication status is critical on the time client. If MD5 is not used, authentication must
be off for broadcast mode to work. Here is a sample “ntp.conf” file used in the time
client, plus a sample command line of the NTP program invocation:
server

192.168.1.49

disable auth

This file is stored in the “/etc” directory on the time client or the same directory that
“ntp.conf” is stored if your directory is different from the standard NTP default directory.
The critical line is: disable auth.
• The line disable auth turns off system authentication and tells the system to not
use authentication for received NTP time broadcast packets.
When you invoke the NTP client at the command line, use the following options:
• –b
to turn on broadcast packet reception
• –d
to turn on debug mode at a sufficient level to verify that broadcast packets are
indeed being used:
ntpd –d –d –d –b
Once you have completed debugging your system, you can prevent incoming messages from
appearing on the command line by turning off the debug option flags.

B.4

Polling
The designated server contacts every server each time it polls for time. Out of the
responses, it picks the best one and uses that as its primary synchronization source. The
"best" one is determined based on a combination of stratum (lowest is best), network
delays (closest is best), advertised precision (smallest is best), plus other criteria that is not
detailed. If the "best" server goes away, after consecutive polling periods with no
response from that server the unit will choose one of the remaining servers to be the
synchronizing source.
In a client/server mode the server (or any NTP client) adjusts the poll interval to maintain
timing between 1 - 10 milliseconds if possible. The interval starts out at the default value
of every 64 seconds, but then lengthens based on the size of the calculated offsets. The
server also starts estimating the average drift of the internal oscillator, and uses this
information to refine its polling period. The typical polling period ends up being about
5 to 8 minutes. This polling period is self-adjusting and can not be adjusted externally.

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C
TIME and DAYTIME Protocols
C.1

TIME Protocol as per RFC-868
TIME protocol provides a site-independent, machine readable date and time. The TIME
service sends back to the originating source the UTC time in seconds since midnight on
January 1, 1900.
This protocol may be used either above the Transmission Control Protocol (TCP) or above
the User Datagram Protocol (UDP).
When used via UDP, the TIME service works as follows:
Server:Listen on port 37 (45 octal).
Client:Send an empty datagram to port 37.
Server:Send a datagram containing the UTC time as a 32 bit binary number.
Client:Receive the TIME datagram.
The server listens for a datagram on port 37. When a datagram arrives, the server returns
a datagram containing the 32-bit time value. If the server is unable to determine the time
at its site, it should discard the arriving datagram and make no reply.

C.1.1

The Time Protocol Format

The time is the number of seconds since 00:00 (midnight) 1 January 1900 UTC, such that
the time 1 is 12:00:01 AM on January 1, 1900 UTC; this base will serve until the year
2036.

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C.2

DAYTIME Protocol as per RFC-867

DAYTIME Protocol as per RFC-867
DAYTIME protocol pertains to a daytime service, a useful debugging and measurement
tool. A daytime service simply sends the current date and time as a character string
without regard to the input.

C.2.1

TCP Based Daytime Service

This daytime service is defined as a connection based application on TCP. A server
listens for TCP connections on TCP port 13. Once a connection is established, the current
date and time is sent out the connection as a ASCII character string (and any data received
is thrown away). The service closes the connection after sending the quote.
C 2.2

UDP Based Daytime Service

This daytime service is defined as a datagram based application on UDP. A server listens
for UDP datagrams on UDP port 13. When a datagram is received, an answering
datagram is sent containing the current date and time as a ASCII character string (the data
in the received datagram is ignored).
C 2.3

DAYTIME String Format

The string format for the DAYTIME Protocol conforms to the Unix workstation time
expression, except the time is in UTC rather than local time. The syntax is as follows:
DDD, MMM, XX, YYYY, HH:MM:SS-UTC

where

86

DDD

=

MMM

=

XX
HH
MM
SS

=
=
=
=

the day: “Sun”, “Mon”, “Tue”, “Wed”, “Thus”,
“Fri”, “Sat”
the month: “Jan”, “Feb”, “Mar”, “Apr”, “May”,
“Jun”, “Jul”, “Aug”, “Sep”, “Oct”, “Nov”, “Dec”
day of the month
hour (24 hour format) of that day
minutes of that hour
seconds of that minute

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SNMP – Simple Network Management Protocol
D.1

About SNMP
SNMP management software allows a network user to remotely monitor and configure an
IP host that supports an SNMP agent. An SNMP agent is protected from unauthorized use
through a security scheme. The Symmetricom NTS supports a SNMP version 1 agent
with the MIB II and Enterprise MIB databases.
The material in this section assumes you already have an understanding of SNMP. If that
is not the case, we recommend “SNMP, SNMPv2 and CMIP” written by William Stallings
and published by Addison-Wesley Publishing Company. This book is considered by the
community to be the definitive introduction to SNMP. Another good reference is “How
To Manage Your Network Using SNMP,” by Marshal T. Rose and Keith McClogurie. For
more technical references, see RFC-1157 (the definition of SNMPv1), RFC-1213 (the
definition of MIB II) and RFC-1354 (the IP Forwarding table addition to MIB II). All
RFCs are published with approval of the Internet Activities Board, found on the Internet
by running any search engine and typing "RFC" in the search field (or “RFC-####” if you
have the number).

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D.2

SNMP Configuration

SNMP Configuration
SNMP offers a security authentication scheme that is based on a common password shared
by the management station and a group of agents. A group of hosts are known as a
community. Any management station or agent can be a member of any combination of
communities. Typically a manager will need to change the SNMP community
information from the SNMP agent factory defaults for security purposes. However, the
factory default SNMP community settings are chosen to make SNMP immediately usable.
Symmetricom’s SNMP agent recognizes up to five separate SNMP communities. These
communities are configured through the serial or Telnet interface using the F100 CONFIG
command. Each community has several configurable parameters that are defined in
Table 1.
Table D-1: SNMP Community Configurable Parameters
Key Word

Definition

Community
Name

The name of this community. The name is limited to up to 32 ASCII letters, numbers or
punctuation letters. This is the name that a management SNMP PDU (packet)
specifies. If the community name of an incoming PDU does not match any of the five
community names, the packet is ignored and an optional authentication trap message
can be generated. See traps below. An empty string field disables the community
name.

“NAME”

Trusted IP
Address
“IP”

R/W Access
“ACCESS”

If the Use Trusted IP flag is set to yes, then this is the table of IP host addresses that
this community recognizes as valid SNMP management hosts. Even if the community
name of an incoming PDU matches this community, the source IP address must match
one of the IP addresses in this table, or the packet is ignored and an optional
authentication error trap message is issued. Setting an IP address to all zeros turns
off that IP address entry. In addition, this table also serves as the list of hosts that
SNMP trap messages are sent to – regardless of the state of the Use Trusted IP flag.
For a particular community, the SNMP variables are set to read only, or normal SNMP
access. This allows the manager to have a public known community from which
anyone may read the SNMP data base and a separate private community that has full
normal read and write access to the SNMP database.
Note: SNMP MIB II does not define all variables to be writeable. SNMP variables
defined by RFC-1213 as read-only remain read-only, regardless of the state of this
R/W Access flag.

88

Trap Enable

When this flag is set to yes, trap messages are issued for this community.

“TRAP”

Note: This enables/disables all traps (both coldstart and authentication).

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Appendix D: SNMP – Simple Network Management Protocol

Table 2 and Table 3 define SNMP configurable parameters that are applied globally to all
SNMP communities (this menu appears after the last community menu), and the
Symmetricom SNMP factory default settings.
Table D-2: SNMP Community Global Parameters
KeyWord

Definition

SNMP Global Enable Traps

When set to yes, all authentication failure traps are disabled. This flag
overrides the Trap Enable flag set for each community and directly sets
the value of the SNMP variable snmpEnableAuthenTraps.0.

“GEN TRAPS”

Note: The state of this flag has no effect on the issue of coldstart trap
messages.
Table D-3: Symmetricom SNMP Default Settings
Key Word

Definition

Community 1
Community Name

Public

Trusted IP Address

0.0.0.0, 0.0.0.0, 0.0.0.0, 0.0.0.0

Use Trusted IP

No

R/W Access

read/only

Trap Enable

No

Trap Port

162

Community 2
Community Name

System

Trusted IP Address

0.0.0.0, 0.0.0.0, 0.0.0.0, 0.0.0.0

Use Trusted IP

No

R/W Access

Normal

Trap Enable

No

Trap Port

162

Community 3 to 5
Community Name
Trusted IP Address

0.0.0.0, 0.0.0.0, 0.0.0.0, 0.0.0.0

Use Trusted IP

No

R/W Access

read/only

Trap Enable

No

Trap Port

162

SNMP Global Enable Traps

Yes

The factory default settings are summarized as follows: community one is called public
and is set to read-only access for the SNMP MIB; community two is named system and it
has normal access to the SNMP database; all other communities are disabled. All traps are
disabled. Many SNMP management utilities are written with these default assumptions
and thus the Symmetricom SNMP is immediately usable without configuration.

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D.3

Serial or Telnet Configuration

Serial or Telnet Configuration
Use Serial or Telnet Function F100 CONFIG to obtain information about the current
SNMP/NTP configuration, or to change the IP addresses, traps, read/write access, or
community names and parameters. For details, see “Configuration of SNMP Parameters
Using FTP” on page 54. Although this option is available, it is much faster and easier to
configure SNMP parameters over the Internet. For details, see “Remote Operation” on
page 21.

D.4

Symmetricom SNMP Enterprise MIB
Introduction

A Management Information Base (MIB) is a database of managed objects that have a
hierarchical structure. There are common or vendor-specific managed objects. The
Internet community has over 1,000 objects registered. The objects themselves are
representations of real physical network properties or information.
Using a TCP/IP network and Symmetricom's SNMP Enterprise MIB, you can remotely
obtain information on the health and status of the NTP application and the primary time
synchronization source using the SNMP version 1 protocol. The Enterprise MIB database
has five variable groups: the Trap Message Group, the Network Time Protocol Group, the
Network Time Server Control Group, the GPS Group, and the ACTS Group. Presently,
the control group is preliminary and is not implemented in the current version of software.
Traps are sent on Change of Status (COS). There are three types of traps: NTP Status,
GPS Status, and GPS Antenna Status. All of them report failures, as well as the return to
active status. The settings are as follows:
• NTP Status:

NTP Client Mode*
NTP Unlocked
NTP Locked

• GPS Status:

GPS Locked
GPS Unlocked

• GPS Antenna Status:

GPS Antenna Fault
GPS Antenna OK

*In NTP Client Mode, NTP is using another NTP server as its timing reference, instead of GPS.

The trap message group holds the ASCII string data to send whenever an SNMP trap
message is transmitted. The NTS agent sends SNMP trap messages to SNMP
management hosts notifying them of some critical event at the NTS agent. The NTS
issues three types of trap messages. The first type is a cold start trap message indicating
when the box boots or re-initializes. The second type of trap message is issued when the
NTS estimated time error has exceeded the minimum time accuracy threshold. The third
trap message is issued when a packet received by the NTS agent fails SNMP
authentication. The second feature notifies a network administrator immediately if the
time server lost its ability to tell accurate time.

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The NTP Enterprise Group furnishes information on the Network Time Protocol. This
group provides packet information for the number of received, rejected, and transmitted
NTP packets exchanged between the UDP transport and the NTP application layers.
Packets are rejected when they are malformed or the MD5 encryption authentication
failed. In addition, time quality can be assessed by looking at the current estimated time
error and comparing it with the time accuracy threshold. Finally, all of the NTP control
information transmitted by the NTS in an NTP packet is available in this enterprise group.
One important variable in this group is ntpSysLeap because it is the clearest indication if
the NTS is telling correct time.
When GPS is used as the time synchronization source, the GPS Enterprise MIB Group
provides detailed information about the satellites used by the NTS time server. Complete
GPS satellite information exists on the number of satellites tracked and used for timing
purposes, their signal strengths, the tracking mode, altitude, longitude, and latitude of the
GPS antenna. This information allows you to properly set up the GPS antenna and to use
the unit for time information.
When ACTS is used as the time synchronization source, the ACTS Enterprise MIB Group
provides detailed information on the ACTS dial-up modem time service. Complete
information on the number and success of the ACTS phone calls as well as a detailed
break down of the various possible modem and line failures that can occur. This
information allows you to fine tune calling frequency with the desired time accuracy and
assess the telephone line quality of the connection to the ACTS service.
Obtaining the enterprise MIB information requires you to have an SNMP management
program running on your computer.
Variable Definitions

This section contains a complete and formal definition of Symmetricom’s SNMP
enterprise MIB group, including all the variables in Symmetricom's Enterprise MIB, along
with the MIB OID address and data types.
An electronic form of this file was included with this manual. If the disk has been
misplaced or corrupted, a copy can be obtained from Symmetricom’s NTP Systems web
site (http://www.ntp-systems.com/). Select Products and Literature>Reference
Material to get there. The file’s name is “TrueTime.MIB”, and should compile for
virtually any SNMP management software. It has been verified to work for Sun’s Solaris
X-SNMP and Hewlett Packard’s OpenView management software packages.

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Symmetricom SNMP Enterprise MIB

TrueTime DEFINITIONS ::= BEGIN
IMPORTS
MODULE-IDENTITY, OBJECT-TYPE, Integer32
FROM SNMPv2-SMI
Counter
FROM RFC1155-SMI
DisplayString
FROM SNMPv2-TC
TRAP-TYPE
FROM RFC-1215;
--iso
org
dod
internet
private
enterprises
trueTimeEnt

OBJECT
OBJECT
OBJECT
OBJECT
OBJECT
OBJECT
OBJECT

IDENTIFIER
IDENTIFIER
IDENTIFIER
IDENTIFIER
IDENTIFIER
IDENTIFIER
IDENTIFIER

trueTime MODULE-IDENTITY
LAST-UPDATED
"9906190000Z"
ORGANIZATION
"TRUETIME INC."
CONTACT-INFO
"Technical Support"
DESCRIPTION
"TrueTime Enterprise
::= { trueTimeEnt 0 }
trapMsg
OBJECT IDENTIFIER
ntp
OBJECT IDENTIFIER
ntsControl
OBJECT IDENTIFIER
gps
OBJECT IDENTIFIER
acts
OBJECT IDENTIFIER

::=
::=
::=
::=
::=
::=
::=

{
{
{
{
{
{
{

1 }
iso 3 }
org 6 }
dod 1 }
internet 4 }
private 1 }
enterprises 1896 }

MIB"
::=
::=
::=
::=
::=

{
{
{
{
{

trueTimeEnt
trueTimeEnt
trueTimeEnt
trueTimeEnt
trueTimeEnt

1
2
3
4
5

}
}
}
}
}

trapMsgColdStart OBJECT-TYPE
SYNTAX DisplayString (SIZE (0..255))
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This is an ASCII string sent to UDP port 162 (or user defined) when
the TrueTime time server reinitializes. The message is Cold Start Trap
PDU from: ###.###.###.###. Where ###.###.###.### is the doted
decimal notation of the IP address of the booting unit."
::= { trapMsg 1 }
trapMsgNtpAlarm OBJECT-TYPE
SYNTAX DisplayString (SIZE (0..255))
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This is an ASCII-string sent to the UDP-trap port(162 or user defined)
when
the TrueTime time server's detects change of the NTP-status.
This could be due to a line breakage in the timing
source, loss of GPS satellites, etc.
The message is 'NTP Status aaaaaaaa',
where aaaaaaaaa can be NTP UNLOCKED,NTP client mode or NTP LOCKED"
::= { trapMsg 2 }
trapMsgSnmpAuthFail OBJECT-TYPE
SYNTAX DisplayString (SIZE (0..255))
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This is an ASCII string sent to UDP port 162 (or user defined) when
the TrueTime time server determines the SNMP authentication for a SNMP
PDU is in correct. The message is 'SNMP Authentication Failure Trap
PDU from: ###.###.###.###'. Where ###.###.###.### is the doted
decimal notation of the IP address of the unit attempting the invalid
access."
::= { trapMsg 3 }

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trapMsgGpsAntennaFault OBJECT-TYPE
SYNTAX DisplayString (SIZE (0..255))
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This is an ASCII string sent to UDP trap port( 162 or user defined) when
the TrueTime time server's GPS detects change in the antenna status.
The status can be OK or FAULT"
::= { trapMsg 4 }
trapMsgGpsUnlocked OBJECT-TYPE
SYNTAX DisplayString (SIZE (0..255))
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This is an ASCII string sent to UDP trap port (162 or user defined) when
the TrueTime time server's GPS detects change of the GPS status.
The status can be is unlocked"
::= { trapMsg 5 }
trapMsgNewSyncType OBJECT-TYPE
SYNTAX DisplayString (SIZE (0..255))
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This is an ASCII string sent to UDP trap port (162 or user defined) when
the TrueTime time server's GPS detects change of the GPS status. The
message is 'Time synchronization type is now ####' where #### can be
GPS, ACTS or NTP."
::= { trapMsg 6 }
trapMsgCrossCheckAlarm OBJECT-TYPE
SYNTAX DisplayString (SIZE (0..255))
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This is an ASCII string sent to UDP trap port (162 or user defined) when
the TrueTime time server's detects a chan in time synchronization types.
check peer and the server is not in a system alarm condition."
::= { trapMsg 7 }
ntpInPkts OBJECT-TYPE
SYNTAX Counter
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Total number of NTP packets delivered to the NTP application
layer from the transport layer."
::= { ntp 1 }
ntpOutPkts OBJECT-TYPE
SYNTAX Counter
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Total number of NTP packets passed from the NTP application
layer to the transport layer."
::= { ntp 2 }
ntpInErrors OBJECT-TYPE
SYNTAX Counter
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Total number of NTP packets reject for any reason by NTP

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application layer."
::= { ntp 3 }
ntpAuthFail OBJECT-TYPE
SYNTAX Counter
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Total number of authentication failures.
ntpInErrors."
::= { ntp 4 }

This is a subset of

ntpDesiredAcc OBJECT-TYPE
SYNTAX INTEGER (0..2147483647)
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The desired (worst case time) accuracy in microseconds that the
time server will attempt to steer to. This variable is related to
ntpEstError. Should ntpEstError be greater than ntpDesiredAcc, the
NTP alarm condition will be set (ntpSysLeap will be equal to 3).
Note: outgoing NTP packets will have their leap indicator field set to
ntpSysLeap."
::= { ntp 5 }
ntpEstErr OBJECT-TYPE
SYNTAX INTEGER (0..2147483647)
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The current estimated (time) error in microseconds of the time
server. This variable is related to ntpEstError. Usually, this value
is small and constant for a given type of time server. However, when
primary synchronization is lost, this value will slowly increase with
time as the time server's oscillator flywheels away from true time.
Should ntpEstError be greater than ntpDesiredAcc, the NTP alarm
condition will be set (ntpSysLeap will be equal to 3).
Note: a primary time server's outgoing NTP packets will have its leap
indicator field set to ntpSysLeap."
::= { ntp 6 }
ntpSysLeap OBJECT-TYPE
SYNTAX INTEGER
{
noLeapWarningAndTimeIsSynchronized
(0),
lastMinuteHas61SecondsAndTimeIsSynchronized (1),
lastMinuteHas59SecondsAndTimeIsSynchronized (2),
alarmConditionAndLossOfTimeSynchronization (3)
}
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This is a status code indicating normal operation, a leap second to
be inserted in the last minute of the current day, a leap second to be
deleted in the last second of the day or an alarm condition indicating
the loss of timing synchronization. Note: a primary time server's
outgoing NTP packet will have its leap indicator field set to
ntpSysLeap."
::= { ntp 7 }
ntpSysHostMode OBJECT-TYPE
SYNTAX INTEGER
{
hostModeIsReserved0
(0),
hostModeIsSymmetricActive (1),
hostModeIsSymmetricPassive (2),

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hostModeIsClient
hostModeIsServer
hostModeIsBroadcast
hostModeIsReserved6
hostModeIsReserved7

(3),
(4),
(5),
(6),
(7)

}
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The value of this variable indicates the mode that the host is
operating in. Note: this is the value of the time server's outgoing
NTP packet mode field."
::= { ntp 8 }
ntpSysStratum OBJECT-TYPE
SYNTAX INTEGER (1..255)
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This is an integer that ranges from 1 to 255 indicating the stratum
level of the local clock. Note: a primary time server sets outgoing NTP
packets stratum field and ntpSysStratum to 1."
::= { ntp 9 }
ntpSysPoll OBJECT-TYPE
SYNTAX INTEGER (6..10)
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"When the time server is in NTP broadcast mode, this is an integer
indicating the maximum interval between successive NTP messages, in
seconds to the nearest power of two. For example a value of 6 means
2^6 or 64 seconds. Note: a primary time server's outgoing NTP packet
will have its poll field set to ntpSysPoll. Note: this field is equal
to 0 when not in NTP broadcast mode. Note, unless this is a time
server initiated NTP packet the value of the poll equals the value set
in the in coming packet."
::= { ntp 10 }
ntpSysPrecision OBJECT-TYPE
SYNTAX INTEGER (-127..127)
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This is an integer indicating the ultimate precision of the
synchronizing clock, in seconds to the nearest power of two. Note: a
primary time server's outgoing NTP packet will have its precision
field set to ntpSysPrecision."
::= { ntp 11 }
ntpSysRootDelay OBJECT-TYPE
SYNTAX Counter
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This is a raw 32 bit number representing a signed fixed point 32-bit
number indicating the total round-trip delay to the primary
synchronization clock source in seconds with the fraction point
between bits 15 and 16. Note that this variable can take on both
positive and negative values, depending on clock precision and skew.
Note: a primary time server's outgoing NTP packet will have its root
delay field set to ntpSysRootDelay."
::= { ntp 12 }
ntpSysRootDisp OBJECT-TYPE
SYNTAX Counter

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MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This is a raw 32 bit number representing a signed 32-bit fixed-point
number indicating the maximum error relative to the primary reference
source, in seconds with fraction point between bits 15 and 16. Only
positive values greater than zero are possible. Note: a primary time
server's outgoing NTP packet will have its root dispersion field set
to ntpSysRootDisp."
::= { ntp 13 }
ntpSysRefClockIdent OBJECT-TYPE
SYNTAX DisplayString (SIZE (0..4))
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This is a four byte ASCII string identifying the particular reference
clock. In the case of stratum 0 (unspecified) or stratum 1 (primary
reference), this is a four-octet, left-justified, zero-padded ASCII
string. While not enumerated as part of the NTP specification, the
following are suggested ASCII identifiers:
StratumCode
Meaning
----------------0
DCN
DCN routing protocol
0
NIST
NIST public modem
0
TSP
TSP time protocol
0
DTS
Digital Time Service
1
ATOM
Atomic clock (calibrated)
1
VLF
VLF radio (OMEGA, etc.)
1
callsign Generic radio
1
LORC
LORAN-C radionavigation
1
GOES
GOES UHF environment satellite
1
GPS
GPS UHF satellite positioning
1
ACTS
ACTS telephone modem dial-up
1
IRIG
Inter-Range Instrumentation Group signal
Note, for TrueTime time servers only GPS, ACTS and IRIG are presently
used. Further, a primary time server's outgoing NTP packet will have
its reference identifier field set to ntpSysRefClockIdent."
::= { ntp 14 }
ntpControlInput OBJECT-TYPE
SYNTAX DisplayString (SIZE (0..255))
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"This variable emulates TrueTime's serial function command strings.
The same commands issued to the serial port can be sent to this
string. Use this variable for SNMP sets of functions strings.
Note, setting this variable clears ntpControlOutput to the null string.
See ntpControlOutput below."
::= { ntsControl 1 }
ntpControlOutput OBJECT-TYPE
SYNTAX DisplayString (SIZE (0..255))
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This variable emulates TrueTime's serial function command
The same commands issued to the serial port can be sent to
This variable holds the output result string from the last
the above ntpControlInput variable. Use this variable for
of function strings. See ntpControlInpuut above."
::= { ntsControl 2 }

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strings.
this string.
setting of
SNMP gets

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gpsGroupValid OBJECT-TYPE
SYNTAX INTEGER
{
gpsGroupIsInvalid (0),
gpsGroupIsValid
(1)
}
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"A test flag indicating if data contained in this SNMP GPS group is
valid or not. This flag equals 1 when GPS is used as the time
synchronization source and 0 for all other sources. "
::= { gps 1 }
gpsNumTrackSats OBJECT-TYPE
SYNTAX INTEGER (0..8)
MAX-ACCESS read-only
STATUS current
DESCRIPTION "The number of GPS satellites tracked."
::= { gps 2 }
gpsNumCurrentSats OBJECT-TYPE
SYNTAX INTEGER (0..8)
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Current number of GPS satellites used in position and time fix
calculations. The number of satellites available depends on how long
the time server has been up, the time of day and the total amount of
clear sky as seen from the GPS antenna. Because of the high frequency
of GPS radio signals, GPS antennas must have unobstructed line of sight
from the antenna to the satellite to receive data."
::= { gps 3 }
gpsSatTrackMode OBJECT-TYPE
SYNTAX INTEGER
{
automaticMode
timeMode

(0),
(1),
surveyStaticMode (2),
surveyDynamicMode (3)

}
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Mode of operation for satellite tracking. See section 3.20 of the
users manual for a complete description of these modes. Generally,
modes 0 and 1 are used for time applications. Mode 2 is useful for
more accurate position information when the unit is stationary, or
slowly moving and mode 3 is for accurate position information when the
unit is moving quickly."
::= { gps 4 }
gpsSatMaxSigStrength OBJECT-TYPE
SYNTAX INTEGER (0..30)
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Strongest signal strength of all tracking satellites in Trimble linear
units. Generally, this number should be 4 or greater for good
reception."
::= { gps 5 }
gpsAltitude OBJECT-TYPE
SYNTAX INTEGER (-2147483647..2147483647)
MAX-ACCESS read-only

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STATUS current
DESCRIPTION
"Altitude of the GPS antenna in centimeters above, or below the
WGS-84 reference ellipsoid. The reference ellipsoid is a rotated
ellipse that is centered on the Earth's center of mass. The surface
of the ellipsoid is not necessarily the same as sea level. The
ellipsoid surface may be as much as 100 meters different from actual
sea level."
::= { gps 6 }
gpsLongitude OBJECT-TYPE
SYNTAX INTEGER (-2147483647..2147483647)
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Longitude location of GPS antenna where: +2147483647 is
maximum east longitude, -2147483647 is maximum west longitude and 0 is
Greenwich England. To calculate the longitude in radians use the
following formula (gpsLongitude * PI) / ((2^31)-1) = longitude in
radians. For degrees: (gpsLongitude * 180) / ((2^31)-1) = longitude
in degrees. Note: longitude varies from -PI to +PI in radians and
-180 to +180 in degrees."
::= { gps 7 }
gpsLatitude OBJECT-TYPE
SYNTAX INTEGER (-2147483647..2147483647)
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Latitude location of GPS antenna where: +2147483647 is the
North Pole, -2147483647 is the South Pole and 0 is the equator. To
calculate the latitude in radians use the following formula
(gpsLatitude * PI) / (2*((2^31)-1)) = longitude in radians. For
degrees: (gpsLatitude * 90) / ((2^31)-1) = latitude in degrees.
Note: latitude varies from -PI/2 to +PI/2 in radians and -90 to +90 in
degrees."
::= { gps 8 }
actsGroupValid OBJECT-TYPE
SYNTAX INTEGER
{
actsGroupIsInvalid (0),
actsGroupIsValid
(1)
}
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"A test flag indicating if data contained in this SNMP ACTS group is
valid or not. This flag equals 1 when ACTS is used as the time
synchronization source and 0 for all other sources. "
::= { acts 1 }
actsBaudRate OBJECT-TYPE
SYNTAX INTEGER
{
baud300 (300),
baud1200 (1200),
baud9600 (9600)
}
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Indicates the baud rate setting for the ACTS modem. The ACTS
dial-up service accepts 300 or 1200 baud. Note: this is a rare case
where faster is not better and 300 baud yields the best time accuracy."
::= { acts 2 }

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actsFailRedial OBJECT-TYPE
SYNTAX INTEGER (0..9999)
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"When the dial-up session fails to connect this is the time in
seconds to wait to try again."
::= { acts 3 }
actsMaxCallPeriod OBJECT-TYPE
SYNTAX INTEGER (0..999)
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This is the maximum time in minutes the ACTS unit will wait between
successful calls to the ACTS service. "
::= { acts 4 }
actsPhoneNum OBJECT-TYPE
SYNTAX DisplayString (SIZE (0..25))
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This is the phone number of the ACTS dial-up service, including
any prefixes needed to reach an outside line or international dialing.
Prefixes are separated by a comma from the main phone number."
::= { acts 5 }
actsNumberOfCalls OBJECT-TYPE
SYNTAX Counter
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Number of times the time server has called the ACTS dial-up
service - weather the call was successful or not."
::= { acts 6 }
actsGoodCalls OBJECT-TYPE
SYNTAX Counter
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Number of times the time server called the ACTS dial-up service
and successfully received the time."
::= { acts 7 }
actsBadCalls OBJECT-TYPE
SYNTAX Counter
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Number of times the time server called the ACTS dial-up service
and something was not right. This variable is the sum total of all
other ACTS failure types."
::= { acts 8 }
actsFailedInit OBJECT-TYPE
SYNTAX Counter
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Time server's internal modem failed to initialize. If this is
excessive, it may indicate a time server hardware failure. "
::= { acts 9 }

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actsNoDialTone OBJECT-TYPE
SYNTAX Counter
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Time server's internal modem found no dial tone.
caused by a broken phone line to the time server.
::= { acts 10 }

This may be
"

actsNoCarrier OBJECT-TYPE
SYNTAX Counter
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Time server's internal modem found no carrier. No modem was
found at the other end and maybe the phone number for ACTS is wrong."
::= { acts 11 }
actsBusyLine OBJECT-TYPE
SYNTAX Counter
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Time server's internal modem found ACTS line busy."
::= { acts 12 }
actsNoAnswer OBJECT-TYPE
SYNTAX Counter
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The remote ACTS mode did not answer the call."
::= { acts 13 }
actsBadReply OBJECT-TYPE
SYNTAX Counter
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The syntax of the reply from remote modem was incorrect, possibly
due to line noise."
::= { acts 14 }
actsNoOnTimeMark OBJECT-TYPE
SYNTAX Counter
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The reply from remote modem had no on time mark, possibly due to
line noise."
::= { acts 15 }
END

E
Non-Standard Features
This appendix contains information on optional features that may have been added to your
device at the factory. For a standard device, it is normal for this appendix to be empty.
Non-Standard Features

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Index
Index

Numerics
10Base-T/100Base-T 8, 14, 42
Control Command (F100 BASET) 42
-48 VDC Model
Cabling 13
Power Specifications 5

with Authentication 52–53, 81
without Authentication 82–83
Burn BootLoader (F100 BUB) 58
Burn File System (F100 BF) 59
Burn Host Lock Request (F100 BL) 60
Burn Host Lock Reset (F100 BLR) 61
Burn Host Lock Set (F100 BLS) 61
Burn Host (F100 BH) 57
Burn (F100 BU) 58

A
AC Model
Cabling 13
Power Specifications 5
Access 2, 21, 88
Disable Remote Lockout (F100 UNLOCK) 56
Internet 21–23
Lock Display Request (F100 L) 56
Remote Lockout (F100 LOCK) 56
Serial 23–28
Accuracy 6
Acquisition 11
ACT (Connection Speed Indicator LED) 7
actsBadCalls 99
actsBadReply 100
actsBaudRate 98
actsBusyLine 100
actsFailedInit 99
actsFailRedial 99
actsGoodCalls 99
actsGroupValid 98
actsMaxCallPeriod 99
actsNoAnswer 100
actsNoCarrier 100
actsNoDialTone 100
actsNoOnTimeMark 100
actsNumberOfCalls 99
actsPhoneNum 99
Administrator 19
Antenna 3–4, 10–11, 14–15
Feed Circuit Status (F72) 40
Installation 9
Mast Mounting 11
Applications, List of Supported 8
Authentication 88
Broadcast Mode with 52–53, 81
Broadcast Mode without 82–83
Auto-Configure 43

B
Backward Compatibility 37
Bad Satellite 38
Broadcast Mode
Editing MD5 Keys 52–53

C
Cabling 13–14
Change User Name (F100 PN) 62
Change User Password (F100 P) 46
Chassis 3, 14
Cold Boot 15
Commands
and Responses, Serial/Telnet
Common Elements 35
Serial/Telnet
Format 31
List 33–34
Semicolon used as replacement 32
Community 88
Compatibility 37
Configuration 88
Commands (F36 or F100) 37
NET Port
Initial 18–19
Single Entry (F100) 41
Using Serial/Telnet Commands 41
NTP 51
Using FTP 51–55
SNMP
Using FTP 54
Connection 2, 10, 21–22, 24, 29, 42
Connector 2, 8, 10, 13, 23
Conventions 1
Current Satellite 38

D
Data Packet
NTP 74
Data Rates 8, 24
Datagram 85
Date 2
DAYTIME Protocol 6, 86
Default Gateway (F100 G) 45
Delay 74–75
DHCP 6, 8, 72
Command (F100 DHCP) 43

Index

Index

Disable Remote
Lockout (F100 UNLOCK) 56
Display 16
Default 16
Power-Up Sequence ??–16
display 15
Distance 74
Down Converter 11
DTR 23

E
Enabled Satellite 38
Enterprise MIB 19, 87, 90
Environmental Specifications 4
Error Messages 69
Ethernet 2, 8, 10, 21, 43
10Base-T/100Base-T 42
Ethernet Address (F100 EA) 44

F
F03 36
F100 41
F100 BASET 42
F100 BF 59
F100 BH 57
F100 BL 60
F100 BLR 61
F100 BLS 61
F100 BU 58
F100 BUB 58
F100 CONFIG 49
F100 DHCP 43
F100 EA 44
F100 G 45
F100 IC 46
F100 IP 44
F100 J 57
F100 K I L L 60
F100 L 56
F100 LOCK 56
F100 P 46
F100 PI 64
F100 PL 63
F100 PLR 63
F100 PLS 63
F100 PN 62
F100 PR 62
F100 PRESETALL 61
F100 PT 64
F100 QR - Quiet Reset 64
F100 SM 45
F100 ST 47
F100 UNLOCK 56
F100 VER 48
F18 36
F36 37

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Index

F53 37
F60 38
F67 40
F72 40
Fault Status Request (F72) 40
Formats
Serial/Telnet Commands 31
Frame 8
Frequency 5
Front Panel 7
Display
Power-Up Sequence ??–16
Power-Up Sequence 15
FTP 6, 8
Configuring NTP 51–55
Configuring SNMP 54
Installing and Using Software 49
Function Commands 33

G
Gateway (F100 G) 45
Good Satellite 38
GPS 2, 11, 16, 75
Lock Status Fault Detector (F72) 40
gpsAltitude 97
gpsGroupValid 97
gpsLatitude 98
gpsLongitude 98
gpsNumCurrentSats 97
gpsNumTrackSats 97
gpsSatMaxSigStrength 97
gpsSatTrackMode 97
Guest Login Password 67

H
Host 6, 76
HTTP 2
Humidity 4
HyperTerminal
Reconnecting to Last Session 28
Setting Up a Session 26–28
Starting 24–26

I
IEEE 8
Informational Messages 71
Installation 9
Interface Specifications 8
Internal Timing Performance Specifications 5
Internet
Access
through Telnet 21–23
IP Address 44

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Index

Index

J
JP5 Jumper Settings (F100 J) 57

L
Leap Indicator 74
Leap Second 40, 74
Command (F67) 40
LED 7
Local Time Source Precision 75
Location 2
Lock Display Request
(F100 L) 56
Login 21, 46, 62
Serial/Telnet Interface Passwords 67
Telnet, During Set-Up 22
Logout 67

M
Mast Mounting (Antenna) 11
MD5 91
Keys 52–53, 79
NTP Broadcast Mode
with Authentication 52–53, 81
without Authentication 82
Protocol 6
Memory
Checksum Test Status (F100 ST) 47
Messages
Error 69–70
Informational 71–72
MIB 19, 87–89
Protocol 6
MIB II 87
Protocol 6
MIlls, Dr. David 2, 79
Web Site 80
Minor 69
Mode 74
Survey Static 37
Mounting
Chassis 9

N
NET Port 2, 6–8, 10, 21, 23
Configuration
Single Entry (F100) 41
Default Gateway (F100 G) 45
IP Address (F100 IP) 44
Network Configuration
Commands (F36 or F100) 37
Initial 18–19
Using Serial/Telnet Commands 41
Subnet Mask (F100 SM) 45

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Index

Network Time Protocol, See NTP
Non-Standard Features 101
Non-Volatile Memory 47
NTP 6
Broadcast Mode
Editing MD5 Keys 52–53
with Authentication 52–53, 81
without Authentication 82–83
Client 6
Configuration 51
Using FTP 51–55
Data Packet 16, 74
Multicast 8
Synchronization Specifications 6
V 3.0 Data Format (RFC-1305) 74
"get" and "set" Commands 49
ntpAuthFail 94
ntpControlInput 96
ntpControlOutput 96
ntpDesiredAcc 94
ntpEstErr 94
ntpInErrors 93
ntpInPkts 93
ntpOutPkts 93
ntpSysHostMode 94
ntpSysLeap 94
ntpSysPoll 95
ntpSysPrecision 95
ntpSysRefClockIdent 96
ntpSysRootDelay 95
ntpSysRootDisp 95
ntpSysStratum 95
ntp.conf file 51–53
ntp.keys file 51–53

O
Operating Altitude 4
Operating Mode Request (F53) 37
Operator
Login Password 67

P
Packet 6
See also, NTP Data Packet
Parameters
Network Configuration, Initial 18–19
Password
Changing 67
Default
Telnet 23
Size 46
Password Lock Request (F100 PL) 63
Password Lock Reset (F100 PLR) 63
Password Lock Set (F100 PLS) 63
Password Reset All (F100 PRESETALL) 61
Password Reset (F100 PR) 62

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Index

Index

Password System User Name Change (F100 PN) 62
PDU 88
Physical Specifications 3
Ping (F100 PI) 64
Position 15–16, 21, 71
Power Specifications 5
Precision 74–75
PRN Number for Satellite 38
Procomm 21
Protocols, List of Supported 6

Q
Quiet Reset 64

R
Rack Mounting Instructions 9
RAM 47
test status (F100 ST) 47
Reboot (F100 K I L L) 60
Receiver 11
Reference Timestamp 76
Remote Control
Lockout (F100 LOCK) 56
RFC-1155 6
RFC-1157 6, 87
RFC-1212 6
RFC-1213 6, 87–88
RFC-1305 2, 6, 74, 76, 80
RFC-1321 6, 80
RFC-1354 87
RFC-2030 2, 6, 77
RFC-2132 6
RFC-854 6
RFC-867 6, 86
RFC-868 2, 6, 101
RFC-959 6
RG-58 11
RG-59 3, 11
RJ-45 2, 8, 10, 14
Root Delay 75
RS-232 8, 10, 14, 23
Pinouts and Signal Levels 23

S
Satellite 11
Acquisition 15
Current 38
Enabled 38
Good/Bad 38
Number Currently Tracked (F53) 37
PRN Number 38
Tracked
List 38
Security 67, 88

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Index

Index

Self Test Status (F100 ST) 47
Serial 2, 8, 10, 21, 24
Access 23–28
Disable Remote Lockout (F100 UNLOCK) 56
Lock Display Request (F100 L) 56
Remote Control Lockout (F100 LOCK) 56
Commands
and Responses, Common Elements 35
List 33–34
Semicolon used as replacement 32
Interface, Login Passwords 67
Server 6, 21, 43
Renaming 52
Session 21, 28, 71–72
Timers 29
SMI 6
SNMP 6, 8, 19, 87–88
Configuration
Using FTP 54
"get" and "set" Commands 49
SNTP 2, 6, 8
Client 6
V 3.0 Data Format (RFC-2030) 77
Software Version Request
F100 VER 48
F18 36
Specifications
Environmental 4
Interface 8
Internal Timing Performance 5
NTP Synchronization 6
Physical 3
Power 5
Status Indicators (LED) 7
Storage Altitude 4
Stratum 74–76
Structure of Management Information (SMI) 6
Subnet Mask (F100 SM) 45
Supported Applications 8
Supported Protocols 6
Survey Static Mode 37
Synchronization 2, 5–6, 16

T
TCP 6, 85–86
TCP/IP 2, 8, 90
Telnet 2, 6, 8
Commands
and Responses, Common Elements 35
List 33–34
Semicolon used as replacement 32
Default Password 23
Interface, Login Passwords 67
Internet Access 21–23
Login, During Set-Up 22
Logout 67
Session Timer 21, 29
Temperature 4–5

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109

Index

Index

Terminal 10, 23–24
Terminal Strip
-48 VDC model 13
Test Status (F100 ST)
RAM test 47
Time and Date Entry/Request (F03) 36
TIME Protocol 6, 85
Time (F100 PT) 64
Timeout 23
Timers
Session 29
Tracked 37–38
Tracked Satellite 38
Trap 88–90
trapMsgColdStart 92
trapMsgCrossCheckAlarm 93
trapMsgGpsAntennaFault 93
trapMsgGpsUnlocked 93
trapMsgNewSyncType 93
trapMsgNtpAlarm 92
trapMsgSnmpAuthFail 92

U
UDP 6, 74, 85–86, 91
User Name
Changing (F100 PN) 62
User Password
Changing (F100 P) 46
UTC 5, 16, 36
Time 15, 85–86
Default Format 16
Utility Port 21, 23–24, 33, 71
Session Timer 29

W
Warranty 2
Web
Interface 2
Windows 24

Z
"get" Command - SNMP (F100 CONFIG) 49
"set" Command - SNMP (F100 CONFIG) 49

110

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