Westell PSA41080-VHF Bi-Directional Amplifier User Manual Part 3

VHF Product Manual

July 2018, Rev B

WESTELL.COM

1.877.844.4274 Page 72 of 95

Firmware selection

(only for dual

version)

User can change filtering mode in case of dual version

signal booster

Simplex mode checkbox control is only visible in devices with such capability. It allows signal

flow only in one direction, either uplink or downlink, at any given time. The chosen direction is

made automatically based on signal detection which, in turn, depends on squelch. Therefore,

turning on simplex mode automatically turns on squelch, both in uplink and downlink sections,

and disables these controls for the user. Besides, it also sets squelch mode to "Not Linked" and

disables this control, too. This is necessary since otherwise the lack of RF input signal in downlink

would mute the uplink RF input, thus blocking all communication. The look of the general

control frame in simplex mode is as in next image:

Filter control frame for narrow-band version

• Filtering control frame.

VHF Product Manual

July 2018, Rev B

WESTELL.COM

1.877.844.4274 Page 73 of 95

Filter control frame for narrow-band version

Filter control frame for adjustable bandwidth version

• Filter control frame: shows configuration and monitoring information of all filters. The

frame is divided in two: uplink and downlink. Data showed in each half is symmetric.

Filter control frame

Parameter

Description

On

Allows to enable/disable each filter

Frequency

Configures center frequency of each filter

Bandwidth filter control for

narrow-band version only

There are up to five available filters (depending on

factory setup) to adjust the trade-off between rejection

to undesired signals and delay

Fine gain control

Each channel gain can be fine adjusted

RF input pow

er

Shows RF input level for each channel

Signal detection

With this indicator, system shows if signal is detected at

input, according to squelch threshold. Moreover, with

Squelch Mode = ‘Linked’, UL shows no signal if signal is

not detected in the same DL channel even if UL signal

exceed squelch threshold. Similarly, with simplex mode

enabled, if one signal is detected at DL band, all UL

filters will show “No signal”

VHF Product Manual

July 2018, Rev B

WESTELL.COM

1.877.844.4274 Page 74 of 95

RF output power

Shows estimation for RF output level for each channel,

according to programmed gain and AGC control. Shows

‘OFF’ in the same cases that signal detection shows ‘No

signal’

AGC

Indicates gain reduction due to power limitation control.

In case of adjustable filter version, filter control frame is slightly different. According to

entry mode button, frequency and bandwidth parameter configuration can be:

o Center frequency (in 25KHz steps) and bandwidth filters (50KHz steps)

o Start and stop frequencies (in 25KHz steps)

VHF Product Manual

July 2018, Rev B

WESTELL.COM

1.877.844.4274 Page 75 of 95

12

1212

12

Spectrum Analyzer

Spectrum AnalyzerSpectrum Analyzer

Spectrum Analyzer

The spectrum analyzer feature of the Signal Booster is a useful tool for

commissioning and troubleshooting. This section explains how to use it.

Frequency at

cursor position

Stop frequency

setting

Stop frequency

setting

Scan refresh

indication

Resolution bandwidth &

Sweep time readout Zero Span switch

Input & Output

trace enable

Uplink / Downlink

switch

Uplink / Downlink

switch

Spectrum analyzer settings

Input and output signals are scanned successively and can be shown or hidden

independently:

Spectrum input/output selection

VHF Product Manual

July 2018, Rev B

WESTELL.COM

1.877.844.4274 Page 76 of 95

Either uplink or downlink signal paths are chosen and average up to 32 can help to clean

noise signals. Resolution bandwidth and sweep time are set automatically.

Spectrum UL / DL selection

When start and stop frequencies are set equal, then zero-span mode is activated to show

evolution of signals with time, which may be of special interest with pulsed signals. The

same thing can be achieved by setting the zero-span checkbox, with the convenience that

start frequency change would also change stop frequency accordingly.

Spectrum zero-span mode

Resolution bandwidth becomes enabled in zero-span mode and sweep time is

automatically set according to its setting, which is user selectable between 25.000Hz,

12.500Hz, 6.250Hz and 3.125Hz. Average setting will also impact sweep time in a similar

way.

VHF Product Manual

July 2018, Rev B

WESTELL.COM

1.877.844.4274 Page 77 of 95

Zero span settings

VHF Product Manual

July 2018, Rev B

WESTELL.COM

1.877.844.4274 Page 78 of 95

13

1313

13

SNMP Agent

SNMP AgentSNMP Agent

SNMP Agent

Westell Signal Booster includes a SNMPv1 agent that allows user to supervise the device by

means of 'SET' and 'GET' type commands and, asynchronous traps to notify alarm conditions

can be sent. The device is intended to be monitored by a polling NMS but it can send traps to a

NMS or Trap Receiver if enabled. Westell can provide a NMS system upon request.

The following sections will show the user configurable, relevant information that can be read

via SNMP from the device. The tables will describe these values in order to explain how the

information has to be read and interpreted.

MIB Description

The associated MIB document is WESTELL-BDA-SYSTEMv13-MIB.mib. The Westell MIB is

divided into blocks. Each block describes the characteristics and values of a specific element

but not all elements are implemented in this agent. Each MIB block is divided in two segments,

named 1T and 2T. Segment 1T contains the information that is fixed & read only. Segment 2T

has the information that can vary over time, regardless of it being read/only or read/write.

The following sections will show the user configurable, relevant information that can be read

via SNMP from the device.

Manager

This is a table with 2 consecutive elements, one for each NMS. No checking is done of the

validity of the information stored in the table, so extra care must be taken by the user.

SNMP Managers table

Field Name

OID

Description

Type

Man2TAddress[0]

1.3.6.1.4.1.26355.2.50.3.2.1.2.

0 First NMS Address R/W

Man2TAddress[1]

1.3.6.1.4.1.26355.2.50.3.2.1.2.

1 Second NMS Address R/W

VHF Product Manual

July 2018, Rev B

WESTELL.COM

1.877.844.4274 Page 79 of 95

Man2TPort[0]

1.3.6.1.4.1.26355.2.50.3.2.1.3.

0 First NMS Port where to send traps R/W

Man2TPort[1]

1.3.6.1.4.1.26355.2.50.3.2.1.3.

1 Second NMS Port where to send traps R/W

Man2TEnable[0]

1.3.6.1.4.1.26355.2.50.3.2.1.5.

0 First NMS. 1= Enabled, 2=Disabled R/W

Man2TEnable[1]

1.3.6.1.4.1.26355.2.50.3.2.1.5.

1 Second NMS. 1= Enabled, 2=Disabled. R/W

Man2TAliveNotificationPeri

od[0]

1.3.6.1.4.1.26355.2.50.3.2.1.6.

0

First NMS. If enabled in

Man2TEnable,

defined time between keep-alive

traps.

R/W

Man2TAliveNotificationPeri

od[1]

1.3.6.1.4.1.26355.2.50.3.2.1.6.

1

Second NMS. If enabled in

Man2TEnable, defined time between

keep-alive traps.

R/W

The following MIB tree representation shows this table:

SNMP Managers table

VHF Product Manual

July 2018, Rev B

WESTELL.COM

1.877.844.4274 Page 80 of 95

The following picture shows the same table as seen by the Westell NMS:

NMS: SNMP Managers table

Network

This is a table has just one element with two items. The first one is the device's IP address and

it is read-only to avoid unwanted miss-configuration. This can only be changed by means of the

embedded web server or locally, through USB, by means of the Westell Control Software. The

second item is a “kind” of button intended for resetting the embedded Ethernet hardware

interface.

SNMP Network table

Field Name

OID

Description

Type

Net2TIp[0]

1.3.6.1.4.1.26355.2.50.4.2.1.2.

0 IP address R/O

Net2TResetNetwork[0]

1.3.6.1.4.1.26355.2.50.4.2.1.3.

0

Network reset: reads as

idle

(1), sets to

reset(2) R/W

VHF Product Manual

July 2018, Rev B

WESTELL.COM

1.877.844.4274 Page 81 of 95

The following MIB tree representation shows this table and following there is the NMS view:

SNMP Network table

NMS: SNMP Network table

Device

This is also a one element table, providing several informative fields, but only relevant and

implemented one is the “Location” field, which allows to easily identify a device by a name

provided by the user, usually related to the place where it is located.

VHF Product Manual

July 2018, Rev B

WESTELL.COM

1.877.844.4274 Page 82 of 95

SNMP Device table

Field Name

OID

Description

Type

Dev2TPowerOn[0]

1.3.6.1.4.1.26355.2.50.5.2.1.2.

0 - R/W

Dev2TLocation[0]

1.3.6.1.4.1.26355.2.50.5.2.1.3.

0 String with up to 30 characters R/W

Dev2TConnectionStatus[0]

1.3.6.1.4.1.26355.2.50.5.2.1.4.

0 - R/O

Dev2TMainPowerStatus[0]

1.3.6.1.4.1.26355.2.50.5.2.1.5.

0 - R/O

Dev2TBatteryStatus[0]

1.3.6.1.4.1.26355.2.50.5.2.1.6.

0 - R/O

Dev2TIsolationStatus[0]

1.3.6.1.4.1.26355.2.50.5.2.1.7.

0 - R/O

Dev2TDoorStatus[0]

1.3.6.1.4.1.26355.2.50.5.2.1.8.

0 - R/O

MIB tree view:

VHF Product Manual

July 2018, Rev B

WESTELL.COM

1.877.844.4274 Page 83 of 95

SNMP Device table

The Westell NMS view shows this table under the tab named “info”:

NMS: SNMP Device table

Additional information is shown by clicking on the link named “Description”. This extra piece of

information comes from the fixed table, Dev1Table. The most relevant items in this table are

the following ones:

VHF Product Manual

July 2018, Rev B

WESTELL.COM

1.877.844.4274 Page 84 of 95

SNMP Device Group table

Field Name

OID

Descri

ption

Type

Dev1TGroup[0]

1.3.6.1.4.1.26355.2.50.5.1.1.3.

0 das.info (conformance group) R/O

Dev1TurlExtern[0]

1.3.6.1.4.1.26355.2.50.5.1.1.1

9.0 URL of embedded web server R/O

Alarms

Alarms tables provide information regarding the status of key parts in the system. The fixed

table gralAlarm1Table provides self-explanatory identifiers, gralAlarm1TId, for each relevant

subject. The second item in each element of this table is the gralAlarm1TGroup. When the

device being monitored is a Remote unit, this item just takes the value 'das.alarms '. However,

since the Master unit carries information from all the devices in the whole DAS system, it

provides a different value for each device to which the alarm is assigned to, be it the Master

unit, any of the Remote units or any of the Expansion units. Therefore, the actual number of

elements in this table for the Master unit, depends on how many devices compose the DAS

system. The third item of each element, gralAlarm1TDescription, is left blank, since the first

one suffices for that purpose.

SNMP Alarm Group table

Field Name

OID

Description

Type

GralAlarm1TId[0]

1.3.6.1.4.1.26355.2.50.13.1.1.

2.0 Descriptive identifier string R/O

GralAlarm1TGroup[0]

1.3.6.1.4.1.26355.2.50.13.1.1.

3.0 Conformance group for general alarms R/O

GralAlarm1TDescription[0]

1.3.6.1.4.1.26355.2.50.13.1.1.

4.0 - R/O

VHF Product Manual

July 2018, Rev B

WESTELL.COM

1.877.844.4274 Page 85 of 95

The alarm identifiers available are the following ones:

• AlarmGeneralFail Board malfunction that cannot be determined.

• AlarmHwFail Digital signal processor failure.

• AlarmRxLow No input signal is detected in the downlink direction in any of the

activated filters. Aside from a faulty part, as the donor antenna or RF cable, this also might be

caused be a problem with the base station or frequency configuration. Notice also that signal

detection is dependent on squelch threshold setting. Because of that, this is considered a warning

instead of an alarm.

• AlarmTempHigh High device temperature (over 85ºC).

• AlarmOverloadUplink Excessive RF input signal in UL.

• AlarmOverloadDownlink Excessive RF input signal in DL.

• AlarmTxLowDownlink Detected RF output power much lower than expected. Since output

power measurement is performed by the dedicated monitoring board, a fault in that board would

make this item be set as Unavailable and AlarmPAFaultDownlink set to true.

• AlarmTxHighDownlink Excessive RF output power detected (3dB higher than rated). This is most

likely due to bad gain settings, since AGC would limit output power otherwise.

• AlarmPAFaultUplink Uplink Power Amplifier failure. This alarm is available for certain amplifier

types only, and for the rest an 'unavailable' status is set in the next table.

• AlarmPAFaultDownlink Downlink Power Amplifier failure. A communication failure with the

dedicated monitoring board itself, throws this alarm, too.

• AlarmVswr RF mismatch of PA output is detected. Since VSWR measurement is

performed by the dedicated monitoring board, a fault in that board would make this item be set

as Unavailable and AlarmPAFaultDownlink set to true.

VHF Product Manual

July 2018, Rev B

WESTELL.COM

1.877.844.4274 Page 86 of 95

SNMP Alarms Group table

On the other hand, the mutable table gralAlarm2Table provides the actual status of each

alarm. This table has one element for each element in gralAlarm1Table. Each element has two

items. The first one is a status identifier, gralAlarm2TStatus, be it 'ok', 'warning', 'fail' or

'unavailable'. The second item is a short description of the fault, mainly for human readability.

SNMP Alarm table 2

Field Name

OID

Description

Type

GralAlarm2TStatus[0]

1.3.6.1.4.1.26355.2.50.13.2.1.

2.0 Status enumeration R/O

GralAlarm2TEventDescriptio

n[0]

1.3.6.1.4.1.26355.2.50.13.2.1.

3.0 Short descriptive string R/O

VHF Product Manual

July 2018, Rev B

WESTELL.COM

1.877.844.4274 Page 87 of 95

The next picture is the MIB tree view of this table, and the Westell NMS provides a combined

view of both tables and groups alarms:

SNMP Alarms table

NMS: SNMP Alarms table

VHF Product Manual

July 2018, Rev B

WESTELL.COM

1.877.844.4274 Page 88 of 95

14

1414

14

SNMP Traps

SNMP TrapsSNMP Traps

SNMP Traps

General Explanation

For any event that may set or clear an alarm in the gralAlarm2Table, there is a SNMP trap that

may be sent by the embedded SNMP agent to the manager, if enabled. Therefore, the list of

traps closely reassembles the entries in the alarms table. Furthermore, there is also a keep-

alive trap for letting the SNMP manager that the agent is working, in case that polling is not

being done.

Each trap message has the following fields (except for the keepAlive trap, whose only object is

the agent's IP address

• An identification number associated to the event being signaled.

• A severity indication number.

• A short string description for human readability.

The following list gathers all the available identifiers:

SNMP Trap descriptions and Enterprise Specific IDs

Source event Description ID

Keep-alive

System sends this trap periodically. Period is set with Keep-

Alive Period setting of the trap manager. When this trap is

thrown, the trap counter is not incremented. It is always in

cleared state.

3

General Failure This trap indicates that the board controller is not responding

to the remote supervision system. 5

Hardware Failure This trap indicates malfunction related the Digital Signal

Processor. 6

Rx Input Low DL Downlink input signal is not detected in any active filters. 10

Temperature Internal repeater temperature exceeds +85ºC. 11

Rx Overload UL Uplink RF input level overload 20

Rx Overload DL Downlink RF input level overload 21

Tx Low DL Detected Downlink RF output power is lower than expected. 30

VHF Product Manual

July 2018, Rev B

WESTELL.COM

1.877.844.4274 Page 89 of 95

Source event Description ID

Tx High DL Downlink RF output power too high 31

PA Fault UL Alarm for the UL Power Amplifier if available. 40

PA Fault DL Alarm for the DL Power Amplifier. It may be caused by communication

error with PA monitoring module. 41

VSWR Excessive DL output reflected power: antenna mismatch. 50

As it turns out from this list, there is a one-to-one relationship between events triggering traps

and their notification identifiers. But the trap identifier does not tell whether the event was to

trigger the alarm state or to cancel it. That is the purpose of the severity identification number

in the trap message. The following table lists the severity numbers used:

SNMP Trap status binding

Severity Description StatusID Trap status

binding Binding string

CRITICAL System malfunction comes into effect 1 3 fail

WARNING System warning comes into effect. 4 2 warning

CLEARED System malfunction or warning is

canceled. 5 1 ok

UNAVAILABLE System state cannot be determined 6 99 unavailable

The character string attached to each trap message includes both a short event description

plus a severity description such as “OK” or “FAIL”. As an example, the following picture shows a

snapshot of a trap receiver getting traps from a unit at address 172.18.21.10. The time-stamp

shows time since system boot and SNMP Version is '1'. The severity is set to 'warning'.

VHF Product Manual

July 2018, Rev B

WESTELL.COM

1.877.844.4274 Page 90 of 95

SNMP Trap in trap receiver

Example trap capture

VHF Product Manual

July 2018, Rev B

WESTELL.COM

1.877.844.4274 Page 91 of 95

SNMP Trap capture

Trap data explained:

Enterprise: .1.3.6.1.4.1.26355 (Westell Inc.)

BDA System MIB: .1.3.6.1.4.1.26355.2.50 (applicable to BDA system)

Enterprise specific trap number: 10 (meaning '

Rx Input Low DL

' according to the table of trap

identifiers).

Trap Bindings

1) gralAlarm2TStatus. Value: 2 (see table below)

2) gralAlarm2TEventDescription: Value: “RX LOW DOWNLINK - WARNING”

The first binding in the trap is the gralAlarm2TStatus of gralAlarm2T table in the MIB:

gralAlarm2TStatus OBJECT-TYPE

SYNTAX INTEGER { ok(1), warning(2), fail(3), unavailable(99) }

MAX-ACCESS read-write

STATUS current

DESCRIPTION

"-"

::= { gralAlarm2TableEntry 2 }

and its equivalence to the trap severity is explained in the table shown in previous section.

The second binding is the string used to be human-readable. The only different type of trap is

the keep-alive one, which as an example is shown in next picture:

VHF Product Manual

July 2018, Rev B

WESTELL.COM

1.877.844.4274 Page 92 of 95

SNMP Keep-alive trap capture

and its only binding is the net2TIp part of the net2Table in the MIB

net2TIp OBJECT-TYPE

SYNTAX IpAddress

MAX-ACCESS read-only

STATUS current

DESCRIPTION

"-"

::= { net2TableEntry 2}

List of traps

The following table lists all bindings in each trap for convenience:

SNMP Trap list

Source event Specific Trap ID Bindings Value

Keep-alive 3 1.3.6.1.4.1.26355.2.50.4.2.1.2.0 Ip Address

General Failure 5 1.3.6.1.4.1.26355.2.50.13.2.1.2.0 {1, 2, 3, 99}

VHF Product Manual

July 2018, Rev B

WESTELL.COM

1.877.844.4274 Page 93 of 95

Source event Specific Trap ID Bindings Value

1.3.6.1.4.1.26355.2.50.13.2.1.3.0 String

Hardware Failure 6 1.3.6.1.4.1.26355.2.50.13.2.1.2.1 {1, 2, 3, 99}

1.3.6.1.4.1.26355.2.50.13.2.1.3.1 String

Rx Input Low DL 10 1.3.6.1.4.1.26355.2.50.13.2.1.2.2 {1, 2, 3, 99}

1.3.6.1.4.1.26355.2.50.13.2.1.3.2 String

Temperature 11 1.3.6.1.4.1.26355.2.50.13.2.1.2.3 {1, 2, 3, 99}

1.3.6.1.4.1.26355.2.50.13.2.1.3.3 String

Rx Overload UL 20 1.3.6.1.4.1.26355.2.50.13.2.1.2.4 {1, 2, 3, 99}

1.3.6.1.4.1.26355.2.50.13.2.1.3.4 String

Rx Overload DL 21 1.3.6.1.4.1.26355.2.50.13.2.1.2.5 {1, 2, 3, 99}

1.3.6.1.4.1.26355.2.50.13.2.1.3.5 String

Tx Low DL 30 1.3.6.1.4.1.26355.2.50.13.2.1.2.6 {1, 2, 3, 99}

1.3.6.1.4.1.26355.2.50.13.2.1.3.6 String

Tx High DL 31 1.3.6.1.4.1.26355.2.50.13.2.1.2.7 {1, 2, 3, 99}

1.3.6.1.4.1.26355.2.50.13.2.1.3.7 String

PA Fault UL 40 1.3.6.1.4.1.26355.2.50.13.2.1.2.8 {1, 2, 3, 99}

1.3.6.1.4.1.26355.2.50.13.2.1.3.8 String

PA Fault DL 41 1.3.6.1.4.1.26355.2.50.13.2.1.2.9 {1, 2, 3, 99}

1.3.6.1.4.1.26355.2.50.13.2.1.3.9 String

VSWR 50 1.3.6.1.4.1.26355.2.50.13.2.1.2.10 {1, 2, 3, 99}

1.3.6.1.4.1.26355.2.50.13.2.1.3.10 String

VHF Product Manual

July 2018, Rev B

WESTELL.COM

1.877.844.4274 Page 94 of 95

Appendix A Important Product Information

A.1 Registration Number

FCC – NVRPSA41080-VHF

A.2 UL

This product is UL Listed.

VHF Product Manual

July 2018, Rev B

WESTELL.COM

1.877.844.4274 Page 95 of 95

Appendix B Acronyms and Abbreviations

Table B-1 contains the acronyms and abbreviations used in this manual, along with a definition for

each one.

Table B-1: Acronyms and Abbreviations

AGC Automatic Gain Control

AMPS Advanced Mobile Phone Service

ARFCN Absolute Radio Frequency Channel Number

BCCH Broadcast Control Channel (GSM broadcast channel time slot)

BS Base Station, BS antenna = towards the base station

CDMA Code Division Multiple Access

DC Direct Current

DCS Digital Communication System (same as PCN)

DL

Downlink signal direction (from base station via Signal Booster / Master / Remote to mobile

station)

DPLX Duplex filter

EEPROM Electrical Erasable Programmable Read Only Memory

EGSM Extended Global System for Mobile communication

ETACS Extended Total Access Communication System

ETSI European Telecommunications Standard Institute

WCS Westell Control Software

GSM Global System for Mobile communication

HW Hardware

LED Light Emitting Diode

LNA Low Noise Amplifier, uplink and downlink

MS Mobile Station, MS antenna = towards the mobile station

OL Overload

OMS Operation and Maintenance System

PA Power Amplifier

PCN Personal Communication Network (same as DCS)

PCS Personal Communication System

pWOMS Portable Westell Operation and Maintenance Software

PS Power Supply

RF Radio Frequency

RSSI Received Signal Strength Indication

SW Software

UL Uplink signal direction (from mobile station via Signal Booster / Master / Remote to base station)

WEEE Waste of Electric and Electronic Equipment

Westell PSA41080-VHF Bi-Directional Amplifier User Manual Part 3

Westell, Inc. Bi-Directional Amplifier Part 3

Contents

User Manual_Part 3

Navigation menu

Namespaces

Views

Navigation