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

Westell, Inc. Bi-Directional Amplifier Part 3

Contents

User Manual_Part 3

VHF Product Manual July 2018, Rev B WESTELL.COM ©2017 Westell Technologies July 2018; Doc No. VHF Signal Booster UM RA 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 ©2017 Westell Technologies July 2018; Doc No. VHF Signal Booster UM RA 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 power 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 ©2017 Westell Technologies July 2018; Doc No. VHF Signal Booster UM RA 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 ©2017 Westell Technologies July 2018; Doc No. VHF Signal Booster UM RA 1.877.844.4274 Page 75 of 95 12121212 Spectrum AnalyzerSpectrum AnalyzerSpectrum AnalyzerSpectrum 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 positionStop frequency settingStop frequency settingScan refresh indicationResolution bandwidth & Sweep time readout Zero Span switchInput & Output trace enableUplink / Downlink switchUplink / 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 ©2017 Westell Technologies July 2018; Doc No. VHF Signal Booster UM RA 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 ©2017 Westell Technologies July 2018; Doc No. VHF Signal Booster UM RA 1.877.844.4274 Page 77 of 95 Zero span settings
VHF Product Manual July 2018, Rev B WESTELL.COM ©2017 Westell Technologies July 2018; Doc No. VHF Signal Booster UM RA 1.877.844.4274 Page 78 of 95 13131313 SNMP AgentSNMP AgentSNMP AgentSNMP 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 ©2017 Westell Technologies July 2018; Doc No. VHF Signal Booster UM RA 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 Man2TAliveNotificationPeriod[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 Man2TAliveNotificationPeriod[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 ©2017 Westell Technologies July 2018; Doc No. VHF Signal Booster UM RA 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 ©2017 Westell Technologies July 2018; Doc No. VHF Signal Booster UM RA 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 ©2017 Westell Technologies July 2018; Doc No. VHF Signal Booster UM RA 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 ©2017 Westell Technologies July 2018; Doc No. VHF Signal Booster UM RA 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 ©2017 Westell Technologies July 2018; Doc No. VHF Signal Booster UM RA 1.877.844.4274 Page 84 of 95 SNMP Device Group table Field Name OID Description 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] 1.3.6.1.4.1.26355.2.50.5.1.1.19.0 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 ©2017 Westell Technologies July 2018; Doc No. VHF Signal Booster UM RA 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 ©2017 Westell Technologies July 2018; Doc No. VHF Signal Booster UM RA 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 GralAlarm2TEventDescription[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 ©2017 Westell Technologies July 2018; Doc No. VHF Signal Booster UM RA 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 ©2017 Westell Technologies July 2018; Doc No. VHF Signal Booster UM RA 1.877.844.4274 Page 88 of 95 14141414 SNMP TrapsSNMP TrapsSNMP TrapsSNMP 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 ©2017 Westell Technologies July 2018; Doc No. VHF Signal Booster UM RA 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 ©2017 Westell Technologies July 2018; Doc No. VHF Signal Booster UM RA 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 ©2017 Westell Technologies July 2018; Doc No. VHF Signal Booster UM RA 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 ©2017 Westell Technologies July 2018; Doc No. VHF Signal Booster UM RA 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 ©2017 Westell Technologies July 2018; Doc No. VHF Signal Booster UM RA 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 ©2017 Westell Technologies July 2018; Doc No. VHF Signal Booster UM RA 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 ©2017 Westell Technologies July 2018; Doc No. VHF Signal Booster UM RA 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

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