Shyam Telecom DB6M33SA DB6M Dual Band Repeater DB6M33-700UC+AWS User Manual
Shyam Telecom Inc. DB6M Dual Band Repeater DB6M33-700UC+AWS Users Manual
Users Manual
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RF / DB6M Series
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5920 003
0 200 September 2010
D
DB
B6
6M
M (
(Dual Band)
6 Sub-Band Repeater for Outdoor Applications
(FCC ID: S3CDB6M33SA and IC:5751A-DB6M33SA
for AWS and 700 LTE Upper C Sub-Bands only)
PROPRIETARY INFORMATION
The information contained herein is proprietary to Shyam Telecom Limited.
Unauthorized access, copy and replication are prohibited. This document must
not be copied in whole or part by any means or it shall not be disclosed or
divulged to any third Party without the prior written consent of Shyam Telecom
L
imited
.
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CONTENTS
1. Document History.........................................................................................4
2. Disclaimer......................................................................................................5
3. Safety Instructions and Warnings...............................................................6
3.1. Personnel Safety....................................................................................6
3.2. Equipment Safety...................................................................................6
3.3. Electrostatic Sensitivity ..........................................................................6
4. Introduction................................................................................................... 7
4.1. Purpose .................................................................................................7
4.2. Scope.....................................................................................................7
4.3. Definitions..............................................................................................7
4.4. References ............................................................................................8
4.5. General..................................................................................................9
5. Functional Description of DB6M Dual Band Repeater...............................9
5.1. General Description ...............................................................................9
6. To Get started-Basic Software Control Of the system.............................11
6.1. General................................................................................................11
6.2. Terminal Set-up ...................................................................................12
6.3. Block Schematic Description ...............................................................26
7. DB6M Repeater Specifications ..................................................................28
7.1. Electrical Specifications-RF ...................................................................1
7.2. Electrical Specification Power Requirement ..........................................1
7.3. External Electrical Interface .................................................................29
7.4. Mechanical Specification .....................................................................29
7.5. Environmental Specification.................................................................29
7.6 Contents of Delivery............................................................................30
8. Installation...................................................................................................31
8.1. Preparation Sheet- Pre Installation ......................................................31
8.2. Engineering Consideration...................................................................32
8.3. Installation Tools..................................................................................34
8.4. Installation Procedure..........................................................................34
8.5. Repeater Gain Settings........................................................................35
8.6. Commissioning ....................................................................................35
8.7. Dos & Don’t Dos ..................................................................................36
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8.8. Checklist – Post Installation.................................................................37
9. Trouble Shooting ........................................................................................40
10. System Maintenance.................................................................................41
10.1. General..............................................................................................41
10.2. Preventive Maintenance ....................................................................41
11. Shut Down Mechanisms……………………………………………………42
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1. Document History
Document
Number
Document
Name
Date Compiled
by Approved
by Revision
5920 0030
200 DB6M Dual
Band Repeater September
2010 Inderjit Ramvir
Singh
Revision Revised Section Date
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Intentionally Left Blank
2. Disclaimer
Every attempt has been made to make this material complete, accurate, and
up-to-date. Users are cautioned, however, that Shyam Telecom Limited
reserves the right to make changes without notice and shall not be
responsible for any damages including consequential, caused by reliance of
the contents presented, including, but not limited to, typographical,
arithmetical, or listing errors.
Product name(s) referenced in this document may be trademarks or
registered trademarks of their respective companies, and are hereby
acknowledged.
In areas with unstable power grids (mains) all repeaters must be installed with
a voltage regulator ensuring a constant voltage level at the repeater power
input. A maximum voltage deviation should remain within the input range to
the repeaters for warranty purposes.
All antennas must be installed with lightening protection. Damage to internal
modules, as a result of lightening is not covered by the warranty.
All specifications are subject to change without prior notice.
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3. Safety Instructions and Warnings
3.1. Personnel Safety
Before installing or replacing any equipment, the entire manual should be
read and understood. The user needs to supply the appropriate AC power to
the Repeater. Incorrect AC power settings can damage the repeater and may
cause injury to the user.
Throughout this manual, there are "Caution" warnings, "Caution" calls
attention to a procedure or practice, which, if ignored, may result in injury or
damage to the system or system component or even the user. Do not
perform any procedure preceded by a "Caution" until the described
conditions are fully understood and met.
3.2. Equipment Safety
When installing, replacing or using this product, observe all safety
precautions during handling and operation. Failure to comply with the
following general safety precautions and with specific precautions described
elsewhere in this manual violates the safety standards of the design,
manufacture, and intended use of this product. Shyam Telecom Limited
assumes no liability for the customer's failure to comply with these
precautions. This entire manual should be read and understood before
operating or maintaining the repeater system.
It calls attention to a procedure or practice which, if not followed, may result
in personal injury, damage to the system or damage to individual
components. Do not perform any procedure preceded by a
CAUTION until described conditions are fully understood and met.
3.3. Electrostatic Sensitivity
ESD = ELECTROSTATIC DISCHARGE SENSITIVE DEVICE
Observe electrostatic precautionary procedures.
CAUTION
CAUTION
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Semiconductor transmitters and receivers provide highly reliable performance
when operated in conformity with the intentions of their design. However, a
semiconductor may be damaged by an electrostatic charge inadvertently
imposed by careless handling.
Static electricity can be conducted to the semiconductor chip from the centre
pin of the RF input connector, and through the AC connector pins. When
unpacking and otherwise handling the Repeater, follow ESD precautionary
procedures including the use of grounded wrist straps, grounded workbench
surfaces, and grounded floor mats.
The RF repeater mentioned is tested thoroughly for maximum composite power.
There is provision of ALC / APC (automatic level control / automatic power
control) which limits the output power in DL path and in UL path beyond the
specified limit. It operates in LTS 700 band – upper C sub-band of 10 MHz BW
(CF in UL 781 MHz & CF in DL 751 MHz) and AWS band 10 MHz sub-band (
UL 1710-1755MHz, DL 2110-2155MHz). Donor antenna and server antenna
must be fixed on permanent structure with enough isolation between donor and
server antenna to avoid any possible oscillations.
4. Introduction
4.1. Purpose
The purpose of this document is to describe the electrical and mechanical
specifications, operation and maintenance of the DB6M Dual Band
Repeater.
4.2. Scope
This document is the product description of the Shyam DB6M Dual Band
Repeater for outdoor application.
4.3. Definitions
AGC Automatic Gain Control
ALC Automatic Level Control
APC Automatic Power Control
BCCH Broadcast Control Channel
BTS Base Transceiver Station
BSEL Band Selective
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CDMA Coded Division Multiple Access
CMC Configuration & Monitoring Console software
CMB Combiner Unit
CSEL Channel Selective
DCS Digital Communication System
DL Downlink signal (from base station via repeater to
mobile station)
EGSM Extended Global System for Mobile Communication
ETSI European Telecommunications Standard Institute
GSM Global System for Mobile communication
GUI Graphics User Interface
LAC Location Area Code of the BTS site
LED Light Emitting Diode
LNA Low Noise Amplifier
LO Local Oscillator
MS Mobile Station
MSC Mobile Switching Center
NMS Network Management System
PCN Personal Communication Network
PCS Personal Communication System
PSU Power Supply Unit
RF Radio Frequency
RMS Repeater Management System/Remote Monitoring
System
RSSI Received Signal Strength Indication
RTC Real Time Clock
SMS Short Message Service
TACS Total Access Communication System
TDMA Time Division Multiple Access
VFD Visual Florescent Display
UL (Uplink) Uplink signal direction (from mobile station via
repeater to base station)
4.4. References
[1] ETS 300 086
Radio Equipment and Systems Land mobile service Technical
characteristics and test conditions for radio equipment with an internal or
external RF connector intended primarily for analogue speech.
[2] ETS 300 609-4
Digital cellular telecommunications system (phase 2): Base Station
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Systems (BSS) equipment specification: Part 4: Repeaters.
[3] ETS 300 342-3
Radio Equipment and Systems (RES); Electro-Magnetic Compatibility
(EMC) for European Digital Cellular Telecommunications Systems. Base
Station Radio and ancillary equipment and Repeaters meeting phase 2
GSM requirements.
4.5. General
Mobile Communications Systems are planned as cellular systems and each
cell of the base station is required to provide RF coverage over a certain
geographical area as per defined RF power levels. Due to the RF
propagation properties, even using high radiated RF powers or complicated
antenna systems, there are zones within the coverage area where the RF
signal strength from base station remains inadequate for establishing the
desired connectivity to mobile users.
Repeaters traditionally are deployed in the Mobile Communication Network
to fill in the “Dead Zones” caused by blocking of signals by geographic
topologies such as mountains, valleys, dense foliage, high rising urban
landscapes and other man-made structures. The distance from the base
station also adversely affects the RF signal strength. The user views
repeaters as a means to extend base station coverage so as to reduce the
number of base stations and thereby accelerate network availability.
Repeater systems are installed after meticulous planning between BTSs and
the mobile users to provide RF coverage in the shadowed regions. Repeater
systems are available for different applications and ultimate choice shall
depend on some of the factors mentioned below:
• Area to be provided with coverage.
• Indoor/outdoor coverage.
• Availability of BTSs in the vicinity.
• Antenna isolation to be achieved.
5. Functional Description of DB6M Dual Band Repeater
5.1. General Description
The DB6M dual band modular Repeater System is designed to provide
outdoor coverage and can handle signals in up to six sub bands maximum
with 3+3 configuration or as per requirement in two of the service bands,
used around the World by various service operators. It provides highly
selective amplification in the pre-set frequency bands. The details of
operating service frequency bands are given below:
SNo Service Band DL Frequency (MHz) UL Frequency (MHz)
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S.No.
Service Band DL Frequency (MHz) UL Frequency (MHz)
1. SMR 800 851-866 806-821
2. Cellular 869-894 824-849
3. SMR 900 935-941 896-902
4. EGSM 925-960 880-915
5. GSM 900 935-960 890-915
6. DCS 1805-1880 1710-1785
7. PCS 1930-1990 1850-1910
8. UMTS 2110-2170 1920-1980
9. AWS 2110 – 2155 1710 - 1755
10. LTE 700 Upper C, A and B sub-bands are available
The Customer is requested to refer to the sticker on the repeater unit giving
the details of frequency bands set & the bandwidths of different sub bands
equipped in the repeater.
**Only sub bands of AWS and LTE700 Upper C are for FCC and IC approval under FCC ID:
S3CDB6M33SA and IC:5751A-DB6M33SA.
Models: OD6R2-Equipped with 2 sub bands
OD6R3-Equipped with 3 sub bands
OD6R4-Equipped with 4 sub bands
OD6R5-Equipped with 5 sub bands
OD6R6-Equipped with 6 sub bands
• The DB6M repeater is designed to provide optimal coverage, the
area covered shall primarily depend on RF power radiated, manmade
structures in the area (high rise buildings), the geographical topologies
and availability of reflecting surfaces.
• The ultimate performance & coverage shall depend on the
obstructions blocking / absorbing of the RF signals by various objects
between the Server antenna of RF repeater and the mobile users.
• The repeater is specifically designed for the Operators who are
allocated frequency spectrum in different service bands and non-
contiguous sub bands are specified.
• The repeater adopts duplex mode and bi-directional amplification for
UL & DL signals between the base station and mobile users.
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• It receives signals from the BTS through a DONOR antenna (highly
directional outdoor antenna) and distributes the signals to mobile users
after amplification through SERVER antenna(s) of directional type in
the DL.
• In the UL, the signals from the mobile users are picked up by
SERVER antenna and retransmitted to the BTS after amplification.
• The repeater finds applications in tunnels, highways, large size
airports, and open market areas etc. where traffic requirement is high.
• The system can be incorporated with optional Remote Management
System (RMS) which can be used for configuration and monitoring
the status of the link. It helps not only speedy maintenance but remote
configuration also through wireless modem.
The repeater consists of the following modules/units:
• LNA
• Converter modules
• Power amplifiers
• Power supply module
• Quad-plexer for segregating bands with DL/UL directions
• Supervisory module
• Modem with rechargeable battery & antenna (Optional)
• External modem with power adapter & antenna along with software
CD for RMS (optional) application
• A metallic case houses the repeater. Arrangement is made for heat
dissipation especially for amplifiers, which generate more heat. The
choice of suitable metal as the case material gives a lightweight design
with good heat conduction and waterproof protection. The housing
conforms to IP65 (NEMA 5) standards.
6. To Get started-Basic Software Control Of the system
6.1. General
The system is equipped with a supervisory module that allows the monitoring
and control of various parameters such as RF power, attenuation,
temperature, status of door and alarm conditions etc.
The communication interface between the local terminal and the control
module can be set up using the Configuration & Monitoring Console
software (CMC), which is an easy to use GUI for simple control and
monitoring. It enables monitoring of parameters & subsequent adjustment if
required.
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This function can be performed either using a terminal (PC/laptop) locally, or
through remote login using the wireless modem (Optional) located in the
repeater. USB port is provisioned in the equipment for connecting
PC/laptop.
6.2. Terminal Set-up
The system is delivered with software loaded in order to perform
configuration as per requirement. It also enables monitoring the status.
Configuration of parameters can be carried out locally with the help of laptop /
PC connected to the repeater by means of local USB serial interface or
remotely via wireless modem (Optional) mounted inside the repeater. The
laptop/PC should be loaded with the CMC software available on the
supplied CD along with the USB driver.
I) Login Repeater (Figure 3)
After running the Configuration & Monitoring Console (CMC), user needs
to login the repeater, sequence as under, may be followed:
• Click the “LOGIN” on the command bar.
• Select the user type (ADMINSTRATOR or SUPERVISOR).
• Enter the password.
• Finally click the “OK”.
A message “Logged in successfully” will appear on the screen after
successful login. There are two types of users viz. ADMINISTRATOR
and SUPERVISOR. If user logged in as an ADMINISTRATOR, all
the functions can be performed through the CMC. By default, the
password for both users is “SHYAM”.
SUPERVISOR is allowed to perform monitoring of the status & alarms
but no change in configuration is permitted. However, the SUPERVISOR
can change password if so desired.
II) Configuration
Configuring system means setting the system parameters for operation
as per the requirement at site.
Click on the command bar to display the configuration window, which
allows access to all the configurable repeater parameters. User can login
for configuration of parameters.
• SET is for updating the repeater parameters.
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• READ is for confirming the parameters set during the
configuration.
Information as detailed below can be incorporated after the
“CONFIGURATION” window is activated:
Figure 3: Login Repeater
a. Repeater ID: User can assign a unique repeater ID to each repeater
installed. Up to 10 characters are allowed in this field. (Figure 4)
b. Repeater Location: User can assign the address of location where
repeater is installed. Up to 30 characters are allowed in this field.
(Figure 4)
c. Sub Band ON/OFF Settings: The system can be equipped up to six
sub bands; the sub bands equipped are specified as ON in this window
while others remain in OFF mode. (Figure 5)
d. Sub Band (UL/DL Frequency Bands) Settings: The frequency
bandwidths of all the 6 sub bands or loaded sub bands in UL & DL
are defined. (Figure 6)
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e. Thresholds Output Power: Maximum Output Power limits in UL &
DL for both the bands are set. A “PA Power high” alarm will be
generated when PA power exceeds the upper limit. (Figure 7)
Figure 4: Repeater ID/Location Settings
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Figure 5: Sub Bands ON/OFF Settings
Figure 6: Frequency Settings-Sub bands
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f. Threshold RSSI Limits: Lower and Upper RSSI Limits in DL & UL
paths for both the bands are set. A RSSI High alarm will be
generated when RSSI exceeds the set upper limit, and a RSSI Low
alarm will be generated when RSSI goes below the set lower limit
set. Upper range that can be set varies from -35 to -55dBm. Lower
range that can be set varies from -75 to –95dBm. (Figure 7)
g. PA ON/OFF: User can set uplink and/or downlink PA as ON or
OFF independently for testing/maintenance purpose at the time of
installation for both the bands. (Figure 8)
After completing the installation it must be in ON condition only.
After setting parameters in the relevant (configuration) window, it can
be closed by clicking at “Close”.
Figure 7: Threshold Settings
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Figure 8: PA ON/OFF Settings
III) Monitoring (Figure 9)
In this window, the status of the system is monitored for the following
parameters/conditions:
S.NO. Parameters/Conditions Remarks
1 RSSI (DL) Band 1 Real time DL signal level is displayed.
2 RSSI (DL) Band 2 Real time DL signal level is displayed.
3 RSSI (UL) Band 1 Real time UL signal level is displayed.
4 RSSI (UL) Band 2 Real time UL signal level is displayed.
5 Attenuation Band 1 (DL) Indicates attenuation inserted in the system for
the band in DL.
6 Attenuation Band 2 (DL) Indicates attenuation inserted in the system for
the band in DL.
7 Attenuation Band 1 (UL) Indicates attenuation inserted in the system for
the band in UL.
8 Attenuation Band 2 (UL) Indicates attenuation inserted in the system for
the band in UL.
9 Output Power Band 1(DL) PA output power in dBm is displayed.
10 Output Power Band 2(DL) PA output power in dBm is displayed.
11 Output Power Band 1(UL) PA output power in dBm is displayed.
SNo
Parameters/Conditions
Remarks
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12 Output Power Band 2(UL) PA output power in dBm is displayed.
13 APC for Band 1 (DL) Real time APC for the band in dB is displayed.
14 APC for Band 2 (DL) Real time APC for the band in dB is displayed.
15 APC for Band 1 (UL) Real time APC for the band in dB is displayed.
16 APC for Band 2 (UL) Real time APC for the band in dB is displayed.
17 Power supply 5.5 V, A & B Real time value of 5.5V DC derived supply is
indicated.
18 Power supply 27 V, A Real time value of 27V DC derived supply is
indicated.
19 Internal Battery voltage
Real time value of internal battery equipped. It
is equipped when wireless modem is
incorporated.
20 System Temperature The real time system temperature is displayed.
21 Alarms
Displays if any alarm is present and the
category of alarm i.e. critical, major or minor is
also shown.
IV) Alarms (Figure 10)
Details of alarms displayed are detailed below:
S.No. Alarm Indication Remarks
1 DL RSSI Low (Band 1 & Band 2) When the RSSI low is detected to be
lower than the set limit in any of the two
or both bands, alarm is generated.
2 DL RSSI High (Band 1 & Band 2) When the RSSI high is detected to be
higher than the set limit in any of the two
or both bands, alarm is generated.
3 DL PA Power High (Band 1 & Band 2) When PA Power in DL path exceeds the
set upper limit in any of the two or both
bands, alarm is generated.
4 DL PA Power Low (Band 1 & Band 2) When PA Power in DL path exceeds the
set lower limit in any of the two or both
bands, alarm is generated.
5 DL Auto PA OFF (Band 1 & Band 2) When PA Auto OFF is detected in any
of the two or both bands in DL path, alarm
is generated.
6 DL Manual PA OFF (Band 1 & Band 2) When PA Manual OFF is detected in
any of the two or both bands in DL path,
alarm is generated.
7. UL Auto PA OFF (Band 1 & Band 2) When PA Auto OFF is detected in any
or the two or both bands in UL path,
alarm is generated.
Remarks
Alarm Indication
S.No.
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8 UL Manual PA OFF (Band 1 & Band
2) When PA Manual OFF is detected in
any or the two or both bands in UL
path, alarm is generated.
9 System Temperature High When system Temperature exceeds the
upper limit, alarm is generated.
10 Synthesizer failure (For equipped sub
bands in DL & UL) When the Synthesizer in any of the
equipped sub bands fails, relevant alarm
is displayed.
11 VSWR (DL) It indicates that the mismatch has
occurred in DL due to which VSWR
value has exceeded 1.5:1.
12 VSWR (UL) It indicates that the mismatch has
occurred in UL due to which VSWR
value has exceeded 1.5:1.
Monitoring interval is 3 seconds i.e. after every 3 seconds data on the
monitoring window is refreshed.
Red indication is for Alarm present.
Green indication is for No Alarm.
VFD (Visual Florescent Display): This display facilitates configuration &
monitoring of the system without connecting the PC/Laptop at the USB port.
Press buttons are provided on the VFD strip with following markings with LEDs
to display alarm conditions if any:
• Menu [Status and Configuration captions are visible; either of the two
can be selected at a time].
• UP [It facilitates shifting of arrow (marker) up in Menu to select the
desired function].
• Down [It facilitates shifting of arrow (marker) down in Menu to select the
desired function].
• ENT [It enables to view different parameters/conditions prevailing in
the system depending on function selected through MENU viz.
configuration or status by pressing].
• ESC [It facilitates restoring the original state].
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Different LEDs are provided to show following alarm conditions:
ALARM PANEL DETAILS
S.No. ALARMS DL UL
1PA OFF MAIN ••
2 PA OFF AUTO •• FUNCTION
3PA PWR LOW ••
4PA PWR HIGH •• MENU ESC UP DOWN ENT
5LNA ALARM •• • • • • •
6VSWR ALARM ••
7SYS TEMP HIGH
8DC FAIL
9DOOR OPEN
VFD DISPLAY
•
•
•
NOTE: An alarm depends on the Limits set in Threshold Settings as well as
Alarm Settings by user.
Figure 9: Monitoring (Status)
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Figure 10: Alarms Window
Summary of Alarms
S.No. Alarms Status-VFD
Status -CMC Status -SMS Status-RMS
1. PA Power High DL ● ● ● ●
2. PA Power High UL ● - - -
3. PA Power Low DL ● ● ● ●
4. PA Power Low UL ● - - -
5. VSWR DL ● ● ● ●
6. VSWR UL ● ● ● ●
7. AC fail - - ● -
8. DC fail ● - ● -
9. RSSI Low - ● ● ●
10. RSSI High - ● ● ●
11. System Temperature
High
● ● ● ●
12. Door open ● ● ● ●
13. Synthesizer fail – DL - ● ● ●
14. Synthesizer fail – UL - ● ● ●
15. PA OFF auto – DL ● ● - ●
S.No
.
Alarms Status-VFD Status-CMC Status-SMS Status-RMS
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16. PA OFF auto – UL ● ● - ●
17. PA OFF manual-
DL
● ● - ●
18. PA OFF manual-
UL
● ● - ●
19. 5.5 V- A - ● - ●
20. 5.5V- B - ● - ●
21. 27.0 V-A - ● - ●
22. 27.0 V-B - ● - ●
23. LNA Alarm-DL ● - - -
24. LNA Alarm-UL ● - - -
● Available
- Not Available
Figure 11: Attenuation Setting Window
As per requirement, a variable attenuator up to 31dB can be inserted manually
through software in UL & DL as shown in figure 11 above.
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V) Communication Window (Figure 12)
In COMMUNICATION window, user can select serial communication port
of the computer and type of connection between repeater and computer.
There are two types of connections viz. Local and Remote
Local Connection: In this type of connection, User computer COM Port
and repeater’s USB Port are connected directly using cable. Sequence is
given below:
• Click the “COMM.” on the command bar to display the
COMMUNICATION window.
• Select the Connection Type as “LOCAL”
• Select the computer’s Comm. Port where the repeater is
connected.
• Click “OK”.
Remote Connection: This connection is established through Wireless
Modem. Remote facility is to be clicked and finally click at “OK”.
Wireless Modem (Optional) is equipped inside the housing of the repeater
and it can be easily located through a sticker provided on the same. It has a
groove with SIM cardholder in which the SIM card can be inserted for
remote communication.
VI) Instant Alarms by SMS
The provision exists in the system for getting the alarm information
through “Instant Alarms by SMS” which is carried out by Wireless
Modem. Following information is desired to be fed for enabling this
facility:
• SMS Service Center Number
• RMS Phone Number
• Maintenance Phone Number
• Alarms to be activated
CAUTION
When the communication between repeater & PC/Laptop is in progress
through USB:
1. Do not remove cable from the USB port.
2. Do not switch off the repeater.
In case the communication is not required any more, click at EXIT before
removing cable from USB port to avoid hanging of the PC/Laptop. In case
the PC/Laptop goes in to hanging mode, it has to be re-started after closing
/ switching
OFF
&
ON
the repeater.
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VII) Security Settings (Figure 13)
The system has two levels of permitting Log in to the repeater to avoid
unauthorized operation. The levels are: ADMINISTRATOR &
SUPERVISOR.
Each level has a specific password. The password for each level can be
changed at intervals. ADMINISTRATOR has rights to perform all
functions Viz. Configuration, Monitoring etc. Whereas the
SUPERVISOR is allowed to perform limited functions like monitoring of
alarms, establishing communication etc
VIII) Repeater Management System (RMS): A set of repeaters in an
area can be configured for monitoring from a centralized place. It can be
accomplished through a external modem & PC which sequentially
accesses all the pre defined repeaters with location, ID & mobile
numbers at a set time interval & keeps the events of alarms in its
memory. There is no limitation on managing number of repeaters but the
time interval between successive polling from each repeater shall keep
on increasing as the numbers of repeaters are increased. Further, the
data storage shall depend on the PC which is used with external
modem.
IX) Real Time Clock: The software incorporated in the repeater is
envisaged with a real time clock which is set on real time basis.
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Figure 12: Communication Window
Figure 13: Password Settings
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Figure 14: Real Time Clock Setting Window
6.3. Block Schematic Description
The signals intercepted through the Donor antenna in the DL pass through
different modules/units for further signal processing; the detail explanation is
given upon request.
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a. DONOR Antenna
Donor antenna of appropriate bandwidth & gain interfaces the BTS on
one side and repeater system on other side through RF cable. It is used
to intercept signals from the base station and switch electromagnetic
waves into RF signals in the DL and vice versa in the UL.
Figure 16: A Typical Donor Antenna
The antenna with 10dBi gain transfers the intercepted signals to the
repeater and transmits uplink signals amplified by the repeater.
b. Quad-plexer
c. Low Noise Amplifier (LNA)
d. Converter Module
e. Power Amplifier
f. Supervisory Module
g. POWER SUPPLY
h. SERVER Antenna
2dBi gain server antenna transmits signals from the repeater station to
mobile users and transport received uplink signals from the mobile users
to the base station. Based on the coverage area, directional antenna
having proper gain with connecters is installed at pre-planned spots as per
the coverage area requirements.
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Figure 17: Typical Server Antennas
7. DB6M Repeater Specifications
7.1. Electrical Specifications-RF
S.NO.
Parameter Specified limits/Remarks
1. Number of Bands Two, one each in 700/900 MHz &
1800/1900/2100/AWS MHz frequency
bands or as per requirement of the user.
2. Frequency band in DL
path. Customized as per requirement of the user.
3. Frequency band in UL
path. Incorporated as per requirement of the
customer in accordance with frequency set for
downlink.
4. Number of RF Sub
bands Up to six with 3 sub bands maximum in each
band in 3+3 configuration. Bandwidth of each
sub band is set as per requirement.
5. RF power options &
associated P1 (DL)
+33dBm (+40dBm), +37dBm (+44dBm) &
+40dBm (+47dBm)
6. Automatic Power
Control
25 dB
7. Repeater Gain 95 dB ±3dB for +37dBm RF power
83 dB ±3dB for +33dBm RF power
8. Attenuation range for
gain adjustment in DL
& UL
31 dB in 1 dB step (Software control)
9. Gain flatness over
band Within 4dB
S.No.
Parameters
Specified Limits/Remarks
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10. Gain variation with
temperature ± 1.5 dB
11. Total delay in the
signal path/direction 5.5 microseconds.
12. Noise figure 5 dB Max.
13. Impedance 50 Ohms
14. Return loss 16 dB
15. Power supply 100 to 240 V AC, 47/63 Hz
16. GUI Interface Wireless modem (optional), USB port
7.2. Electrical Specification Power Requirement
Parameters Specified/Limits
Input AC Voltage Range 100-240 V, 47/63 Hz
Power Consumption
+33dBm RF output Power
+37dBm RF output Power
150 watts
300 watts
Power Consumption shall vary in accordance
with sub-bands equipped & RF power
configured
7.3. External Electrical Interface
Parameters Specification
RF port UL N-type (F)
RF port DL N-type (F)
7.4. Mechanical Specification
Dimensions (w x h x d)
560
x445x200 mm (22x17x8 inches) for
+33dBm
850
x515x240 mm (33x20x9 inches) for
+37dBm
Weight 30 Kg. (66 lbs.) for +33dBm
41 Kg. (90 lbs.) for +37dBm
Housing Outdoor application
Grounding Connection Bolt
Housing Color Grey
Cooling Convection
7.5. Environmental Specification
Conditions Specification
Parameters
Specified/Limits
Parameters Specified/Limits
Conditions Specified/Limits
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Operating Temperature -35oC to +550C
Storage Temperature -300C to +850C
Enclosure IP-65
7.6 Contents of Delivery
ITEMS QUANTITY
Repeater DB6M unit-Model as per
requirement 1
PC interface cable for USB port 1
Power cable with 3 pin plug 1
Operation & Installation manual 1
CD containing the application software 1
Wireless Modem (Optional) with antenna 1 set
Repeater Door Key Two nos.
Screws, Nuts & Bolts for mounting 1 set
ITEMS QUANTITY
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8. Installation
8.1. Preparation Sheet- Pre Installation
Before the installation commences, a preparation sheet to examine the various
requirements is to be compiled as per detail given below:
1. General
Application: Outdoor
Service Band 1: Frequency Band DL- Frequency Band UL-
Service Band 2: Frequency Band DL- Frequency Band UL-
Number Of Sub Bands: six
Sub Band 1: Frequency Band DL- UL-
Sub Band 2: Frequency Band DL- UL-
Sub Band 3: Frequency Band DL- UL-
Sub Band 4: Frequency Band DL- UL-
Sub Band 5: Frequency Band DL- UL-
Sub Band 6: Frequency Band DL- UL-
2. Technical requirements
S.NO.
Requirement Remarks
1. Estimated received signal strength available at
site where donor antenna is to be installed
2. Estimated cable loss from donor antenna to the
repeater unit
3. Estimated DL RF power to the input to the
repeater
4. Desired RF Power in DL
5. Proposed gain settings in DL path
6. Attenuator to be inserted in DL path
7. Estimated cable loss from repeater unit to
server antenna port
8. ERP at server antenna
9. Desired RF Power in UL
10. Proposed gain settings in UL path
11. Attenuator to be inserted in UL path
3. Proposed site Address: ---------------------------
Requirement Remarks S.No.
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4. User’s Address & other particulars: ---------------------------------
Date: Prepared by: -------------
8.2. Engineering Consideration
a. Site Selection
Site selection is one of the most critical decisions affecting the overall
performance of the system. A repeater must be located where it can
receive the maximum signal from the donor site in order to maximize the
repeater’s output and performance, signal strength greater than or equal to
-75dBm is desired.
Examples of donor antenna locations include (but are not limited to): the
roof of a building adjacent to the affected area, with the antennas mounted
on the highest possible point on the structure; the top of the hill that is
obstructing the donor site’s coverage, with the antennas mounted on poles
at ground level; an existing utility pole with equipment or as the situation
permits.
Distance from both the donor site as well as from the new area to be
covered must be taken into consideration. The repeater unit should be
located close to the donor site to receive maximum signal strength and at
the same time is located from where the area proposed for coverage can
be reached. In addition, the donor antenna associated should have line of
sight with BTS site to reduce the effects of fading.
Another important issue when choosing a repeater location is the
availability of AC mains for operating the system. Sites where repeater unit
is installed should be easily accessible for the maintenance team.
b. Antenna Selection and Placement
Proper selection of the repeater’s donor and server antennas is crucial in
designing the repeater system. Appropriate antenna characteristics help to
provide proper isolation between the server (coverage) and donor
antennas, which helps to prevent feedback.
Specific ways to achieve proper isolation include: using high gain,
directional antennas with good Front to Back ratios (25dB or better);
physical separation of the repeater’s donor and server antennas; and
external shielding between antennas. A high gain antenna will help
minimize overall path loss to achieve the desired output power. Donor
antenna gains are typically 10 to 12dBi, while server antennas can be
installed as per requirement.
• The antennas should have proper frequency band of operation.
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• Adequate separation is to be ensured from the power lines to
avoid damage to the equipment and humans.
• Antenna with proper characteristics to maintain adequate isolation
to avoid oscillations. Normally, isolation should be 15 dB more
than the gain set for the repeater. It should have good front to
back ratio.
• The beam width for the DONOR antenna should be as small as
possible.
• The SERVER antenna with proper gain required, is installed.
• There should be adequate vertical & horizontal separation
between the DONOR & SERVER antennas to avoid
interference and noise.
Separation can be determined by the mathematical formulas:
Vertical Separation:
Isolation (dB) = 28 + 40 log (D/λ in meters)
Horizontal Separation:
Isolation (dB) = 22 + 20 log (D/ λ in meters) – (Gain of donor
antenna + gain of server antenna)
D-Distance between donor & server antennas in meters
λ – Wave length in meters
c) Overlapping Coverage
Ideally, the repeater system will be engineered with minimal overlapping
coverage between the donor base station and the repeater. However, the
mobile users will occasionally receive signals from both the donor and the
repeater at similar levels. This situation is comparable to a mobile receiving
multiple signals at varying times due to multi-path propagation.
The repeater contributes a maximum signal delay of 5.5 microseconds in
one direction.
d) Call Processing
The mobile communication system perceives calls handled by the repeater
as actually being handled by the donor site (BTS); the repeater is just an
extension of the base station’s coverage. Therefore, the donor handles call
initiation, power control messages, hand-over requests, etc., for mobiles in
the repeater area. When the base station assigns a channel to the mobile,
that channel is sent through the repeater and then re-radiated under the
same frequency. Since the repeater is technically part of the base station,
no hand-over takes place when a mobile moves from the repeater’s
coverage area to that of the base station. When the mobile moves from the
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repeater’s area to a neighboring site, the base station handles the hand-off
in the same way as for a mobile in the base station area.
8.3. Installation Tools
You will need the following basic tools for installation:
a. Standard wrenches/screwdrivers/cable stripper/cable cutter/pliers set
for installing the DB6M Unit and antennas. (Refer to the
manufacturer’s recommendations for installing the antennas).
b. RF cable connection tool for installing connectors.
c. Multi-meter.
d. Mobile handset loaded with Net engineering software to be used for
signal level measurement.
e. Magnetic compass for measuring the azimuth of the BTS and
repeater site.
8.4. Installation Procedure
The DB6M Modular repeater should be installed at an outdoor location
depending on the survey report. The repeater unit shall be mounted vertically
to a mast, which means the RF connectors will be at the bottom side.
In case of wall mounting, minimum physical separation between the repeater
housing & the wall should be 50 mm.
Furthermore, the repeater shall be mounted in a way so that there is free
access to the individual units, while the door of the repeater is open.
Therefore, enough clearance has to be provided for comfortable reach.
The repeater is mounted at the pre-selected site firmly placed with clamps
and other mechanical accessories. Connections as detailed below are carried
out:
• RF cable routed from DONOR antenna is connected at the BTS port
as indicated.
• RF cable routed to SERVER antenna is connected at TX/RX port
for signal distribution.
• For energizing the system, the cable from AC mains is connected at
AC mains port, range 100-240 V.
• USB port is provided for carrying out configuration and monitoring.
Important: Grounding of the unit has to be ensured before extending the
power to the repeater system.
Following points need considerations for laying of RF cable:
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1. RF cable installation must comply with local or National Electrical
Codes. The cable shall have nominal 50-Ohm impedance. Routing of
the RF cables is to be as per the site installation plan.
2. Fix the supplied connectors to the RF cable and verify the following:
• The center conductor to outer shield of RF coaxial cable indicates
“Open Circuit” condition.
• Check for any short circuit between center conductor and outer
shield.
• Place short between the center conductor and outer shield using a
piece of wire temporarily and check the other end of conductor for
any break in the RF cable.
8.5. Repeater Gain Settings
The repeater gain is one of the vital parameters since it also decides the
area required to be provided with RF coverage. The noise contribution has to
be minimum while setting the gain which should be set with utmost care. The
variation in gain up to 31 dB in steps 1 dB is possible to be achieved with the
help of software control attenuator, provided in the system. The gain setting
for Uplink and Downlink path is independent of each other.
a. Forward Gain Setting
The process of setting the forward gain is very simple. Forward signal
level strength can be measured with a mobile hand set loaded with NET
engineering software.
Alternatively, RF output power of repeater can be measured using the
visual indication shown on the display panel of the repeater.
Once the RF output power has been determined, the attenuation will
have to be modified to reach the desired output signal level.
The gain of repeater can be set using any of the following methods:
a. Local USB serial interface mode (GUI based)
b. Through (optional) wireless modem.
b. Reverse Gain Setting
For reverse gain setting, a 31 dB variable attenuator is provided; the
required value can be inserted for the desired gain. The gain is set to
such a value so as to cause minimum interference at the base station but
high enough to ensure a strong signal.
8.6. Commissioning
Important:-Repeater should not be connected to Power without
termination at the antenna ports. The termination can be carried out
either by the antenna connection as well as a dummy load or the 50
Ω
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terminated connection of a measuring instrument (Power Meter,
Spectrum analyzer with appropriate PAD)
After setting the gain, verify the parameters:
1. DL RF power radiated in the set frequency band.
2. Received RF power in the DL.
3. UL RF power radiated in the set frequency band.
4. Received RF power in the UL.
5. Record the value of attenuation introduced for setting the gain.
8.7. Dos & Don’t Dos
1. The site should be accessible for maintenance purposes.
2. Arrangement is to be made to avoid unauthorized access to the
repeater.
3. Proper grounding of the repeater housing is done to avoid damage to the
system.
4. For outdoor applications, the housing must be waterproof.
5. Stable power supply for repeater unit should be ensured.
6. The route of Cables to/from antennas should be short to minimize the
cable losses and should be free from sharp bends & kinks.
7. Local standard of cabling should be followed.
8. The donor antenna should have proper line of sight with the BTS from
where the signals are to be intercepted for maximum signal strength and
to reduce the effect of fading.
9. There should be adequate separation between the cables (antenna
system) and the power lines to avoid damage to the equipment & injury
to humans.
10. The selection of BTS should be made taking other BTSs in the same
vicinity in to consideration to avoid interference.
11. Gain of the repeater should be set after taking antenna isolation in to
consideration.
12. The estimation of coverage area should be confirmed.
13. The system should be configured for normal traffic after actual
measurement of:
a) RF power in the DL
b) RF power in the UL
c) Antenna Isolation
d) Gain settings in DL & UL
14. Feedback regarding performance of the system may be sent to Shyam
Telecom by the user.
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8.8. Checklist – Post Installation
After the installation of the system is accomplished, points as indicated in the
checklist are verified.
Service Bands Particulars:
Frequency Band for Band 1 DL
Frequency Band for Band 1 UL
Frequency Band for Band 2 DL
Frequency Band for Band 2 UL
A. Repeater Installation
S.NO.
Point(s) To be Verified Remarks
1. Ensure isolation between server and donor
antennas, it has to be 15 dB + Gain set of the
repeater.
2. Actual isolation measured
3. Ensure proper grounding of the unit
4. Cable from donor antenna connected to donor
antenna port
5. Cable from server antenna connected to the
relevant port in the unit
6. Mains cable connected to the repeater unit
7. Cable protection ensured and outdoor connections
are waterproof
Remarks Point(s) to be Verified S. No.
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B. Repeater Set Up
S.NO.
Point(s) To be Verified Remarks
1. Number of sub bands equipped
2. Number of Sub band(s) in Band 1 with frequency
bandwidth of each.
3. Number of Sub band(s) in Band 2 with frequency
bandwidth of each.
4. Repeater switched ON
5. Any error (alarms) observed
6. Gain set
7. Power level in DL
8. Attenuation in DL
9. Power level in UL
10. Attenuation in UL
11. Observation on CMC software & GUI
12. Repeater secured & locked
Any Other Remark/Comment:
Date of Installation: ------------------------------------------------------
Repeater ID & Site Address: ------------------------------------------
Name of the Installer: -----------------------------------------------------
Remarks Point(s) to be Verified S.No.
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9. Trouble Shooting
The repeater is provided for different alarm conditions through LEDs on VFD &
further details of alarms are available on GUI. The display of different alarm
conditions on GUI is a guiding tool for locating the faulty module.
The details of alarms in the system is given in clause 6.2 with reference to figure
10 & the associated table which is self explanatory and it shall guide the
maintenance team to detect the faulty unit.
Some of the conditions, which may be observed in field after installation, are
tabulated below:
S.No Observation Possible reasons & solutions
1. The repeater
does not turn
ON.
• Check the AC mains availability at plug.
• Check the continuity of power cable.
• Check the voltage at the input to PSU.
• Check the voltage at the output of PSU.
2. Signals are not
available at the
desired power
after completing
the installation.
• Check the AC power cord and make sure the power switch is
on.
• Check all the connectors of the repeater system for proper
connections.
• The “BTS” port has to be connected to donor antenna.
• The “MS” port has to be connected to server antenna.
• Check the continuity of RF cables going to antennas.
• Check for any alarm on GUI/VFD relating power low.
• Check the RSSI at the in put.
• Check the configuration & set limits.
3. Speech quality is
observed to be
low/unclear/with
echo.
• Vertical & horizontal separation between the donor & server
antennas should be adequate for proper isolation.
• Gain of the repeater may be high, it may have to be reduced.
4. The system
performed well in
the beginning but
after few days,
the performance
has degraded.
• Check the RSSI at the in put.
• Check the line of sight of donor antenna with the BTS.
Observe if any new building has come up which might be
obstructing the signals.
• Verify the net gain of repeater in DL & UL paths if required
the gain may be adjusted.
• Relocate the donor antenna to solve the problem if
necessary.
• Check the RF cable for physical damage if any. Also check
Possible reasons & solutions Observation SNo
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for sharp bends or RF cable pressed. Under these conditions, RF
signal losses increase. If so, replace RF cable.
5. There is no
communication
in one of the sub
bands
• Go to the GUI & observe for the alarm for synthesizer
failure.
• Replace the converter unit, signals shall come up.
The layout of modules in the repeater is shown below
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10. System Maintenance
10.1. General
The system normally operates without any operator intervention or
maintenance. In the event of fault, the field replaceable units (antenna &
cables) should be checked for faults and the system restored. A faulty unit
can be removed and replaced with a spare while the rest of the system is
still operating. Soldering or local repair of the modules should be avoided.
Faulty module/unit should be replaced with genuine spares from Shyam
Telecom Limited only.
The power supply of the faulty repeater should be isolated from AC mains
and DC power before any module is replaced. In the event of a system
malfunction, the status of the antenna systems should be checked as well as
the continuity of the cabling before replacing any modules within the
repeater.
10.2. Preventive Maintenance
The DB6M Modular repeater does not require any preventive
maintenance.
11. Shut Down Mechanisms
The repeater has an automatic shutdown mechanism to protect the repeater
itself, and also to eliminate any degradation to VZW network, when the
normal operational conditions cannot be maintained.
The repeater shuts down automatically when the composite uplink or
downlink output powers are above the values defined as peak for the device
for a period not to exceed 5 seconds.
After automatic shutdown, the repeater automatically turns-on in order to
assess whether the temporary condition has changed. If the condition is still
detected, the repeater shuts down again.
And it takes 3 to 15 minutes (user configurable) to ON again after
automatic shut down.
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For Technical Support, please contact at any of the following addresses:
Asia Pacific
HEADQUARTER
Shyam Telecom Ltd.
246 UDYOG VIHAR, Phase IV,
GURGAON – 122015 (INDIA)
Tel: +91-124-4311600 FAX: +91-124-4018116
Americas
Shyam Telecom Inc.
6, KILMER ROAD, SUIT D,
EDISON, New Jersy-08817 (USA)
Tel: + 1-732-985-1324 Fax: + 1-732-907-1023
Europe
Shyam Telecom GmbH.
Frohsinnstrasse 16,
63739 Aschaffenburg, (GERMANY)
Tel: + 49-6021-45901-0 Fax: + 49-6021-45901-29
E
mail: contact
@
shyamtelecom.com
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FCC Statement:
FCC ID:S3CDB6M33SA
This device complies with Part 2, 27 of the FCC Rules. Operation is
subject to the following two conditions: (1) this device may not cause harmful
interference and (2) this device must accept any interference received, including
interference that may cause undesired operation.
IC Statement:
Trade Name: SHYAM DB6M Dual Band Repeater
Model No.: DB6M33-700UC+AWS
IC: 5751A-DB6M33SA
This device complies with RSS-131, RSS-102 of the IC Rules.
Warning
Changes of modifications not expressly approved by the manufacturer could void
the user’s authority to operate the equipments.
Antenna Information:
This device has been designed to operate with the antennas listed below, and having a maximum
gain of 10dB. Antennas not included in this list or having a gain greater than 10dB are strictly
prohibited for use with this device. The required antenna impedance is 50 ohms.
Antenna (or equivalent) list:
1) Yagi Antenna 10 dbi for outdoor installation
2) Omni Antenna 2 dbi for indoor installation
To reduce potential radio interference to other users, the antenna type and its gain should be so
chosen that the equivalent isotropically radiated power (e.i.r.p.) is not more than that permitted for
successful communication.
WARNING! This equipment complies with FCC & IC radiation exposure
limits set forth for an uncontrolled environment. This transmitter must not
be co-located or operating in conjunction with any other antenna or transmitter. For
mobile or fixed location transmitters, the minimum separation distance is greater than 25
cm (indoor server antenna) and 55cm (outdoor Donor antenna), even if calculations that
the MPE distance would be less.