ADC Telecommunications DVLRCS800 Digivance Long Range Coverage Solution 800 MHz Sys User Manual 75124

ADC Telecommunications Inc Digivance Long Range Coverage Solution 800 MHz Sys 75124

part 5

ADCP-75-124 • Issue B • April 2002 • Section 4: OperationPage 4-16©2002, ADC Telecommunications, Inc.Figure 4-12. HOST RF Display5. Right-click on the Host Rev Att section of the display (see Figure 4-12). The Host RevAtt pop-up screen will open as shown in Figure 4-13.Figure 4-13. Host Rev Att Pop-Up Screen6. Enter the attenuation value that will provide the required gain. Refer to Table 4-2 for theattenuation values and the corresponding gain values.7. Click OK to close the pop-up screen and to make the changes take effect.8. Repeat the process for the diversity reverse path by right-clicking on the Host Div Rev Attsection (see Figure 4-12)and then entering the required attenuation value in the Host DivRev Att pop-up screen.9. Click OK to close the pop-up screen and to make the changes take effect.Right-click here toopen the Host Rev Attpop-up screenRight-click here toopen the Host Div RevAtt pop-up screenFCC ID: F8I-DVLRCS800 - User Manual Part 5
ADCP-75-124 • Issue B • April 2002 • Section 4: OperationPage 4-17©2002, ADC Telecommunications, Inc.2.9 Enter Host Forward and Reverse DelayThe forward and reverse delay function allows entry of from 0to 63 µsec of delay in theforward and reverse paths. This feature is used when multiple systems are used to transport thesame channel and there is asignificant difference in the path delay between systems. Additionaldelay may be entered to balance the overall system delay. The amount of delay required must becalculated by the RF engineer and should be included in the system design plan. The defaultsetting is 0µsec. Use the following procedure to change the forward and reverse path delay:1. Click on the HOST RF tab. The HOST RF display will open within the EMS mainwindow as shown in Figure 4-14.Figure 4-14. HOST RF DisplayTable 4-2. Reverse Path SettingATTENUATION SETTINGGAIN PROVIDEDATTENUATION SETTINGGAIN PROVIDEDATTENUATION SETTINGGAIN PROVIDED0dB →30 dB 11 dB →19 dB 22 dB →8dB1dB 29 dB 12 dB 18 dB 23 dB 7 dB2dB 28 dB 13 dB 17 dB 24 dB 6 dB3dB 27 dB 14 dB 16 dB 25 dB 5 dB4dB 26 dB 15 dB 15 dB 26 dB 4 dB5dB 25 dB 16 dB 14 dB 27 dB 3 dB6dB 24 dB 17 dB 13 dB 28 dB 2 dB7dB 23 dB 18 dB 12 dB 29 dB 1 dB8dB 22 dB 19 dB 11 dB 30 dB 0 dB9dB 21 dB 20 dB 10 dB -- --10 dB 20 dB 21 dB 9 dB -- --Right-click here toopen the Host FwdDelay pop-up screenRight-click here toopen the Host RevDelay pop-up screenRight-click here toopen the Host Div RevDelay pop-up screen
ADCP-75-124 • Issue B • April 2002 • Section 4: OperationPage 4-18©2002, ADC Telecommunications, Inc.2. Right-click on the Host Fwd Delay section of the display (see Figure 4-14). The HostFwd Delay pop-up screen will open as shown in Figure 4-15.3. Obtain the value of the forward delay as specified in the system design plan.4. Enter the forward path delay value and click OK to close the pop-up screen and to makethe changes take effect.5. Repeat the process for reverse delay and diversity reverse delay by right-clicking on theappropriate delay section (see Figure 4-14)and then entering the required delay value inthe pop-up screen.6. Click OK to close each pop-up screen and to make the changes take effect.Figure 4-15. Host Fwd Delay Pop-Up Screen
ADCP-75-124 • Issue B • April 2002 • Section 5: MaintenancePage 5-1©2002, ADC Telecommunications, Inc.SECTION 5: MAINTENANCE1 SYSTEM MAINTENANCE OVERVIEW. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-11.1 Tools and Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-12 FAULT DETECTION AND ALARM REPORTING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-23 FAULT ISOLATION AND TROUBLESHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-64 TEST PROCEDURES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-114.1 Optical Power Test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-114.2 Optical Loopback Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-125 MAINTENANCE PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-135.1 Scheduled Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-145.2 Remote Unit Cabinet Filter Cleaning Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-145.3 Host Unit Fan Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-155.4 Spectrum Transport Module Fan Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-175.5 Linear Power Amplifier Fan Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-19_________________________________________________________________________________________________________1 SYSTEM MAINTENANCE OVERVIEWThis section explains the Digivance LRCS fault detection and alarm reporting system, providesamethod for isolating and troubleshooting faults, and provides test and maintenanceprocedures. The Digivance LRCS requires minimal regular maintenance to insure continuousand satisfactory operation. Components that require regular replacement, cleaning, or testinginclude the HU and RU fans and the RU air-filter and back-up battery,Maintenance also includes diagnosing and correcting service problems as they occur. When analarm is reported, it will be necessary to follow asystematic troubleshooting procedure to locatethe problem. Once the source of the problem is isolated, the appropriate corrective action can betaken to restore service. The only internal components that can be replaced are the cooling fanswhich mount in the HU, RU, and LPA. The failure of any other component within aunit willrequired replacement of that unit.1.1 Tools and MaterialsThe following tools and materials are required in order to complete the procedures in thissection:•ESDwrist strap•IRfiltering safety glasses• Patch cords with SC connectors•15dB in-line SC optical attenuators•Opticalpower meter (1550 and 1310 nm)• Laser light source•TORXscrewdriver (with T10 bit)
ADCP-75-124 • Issue B • April 2002 • Section 5: MaintenancePage 5-2©2002, ADC Telecommunications, Inc.•Batterymaintenance tools (see PRC-SERIES OPERATING AND FIELD SERVICEMANUAL for tool recommendations)2 FAULT DETECTION AND ALARM REPORTINGThe Digivance LRCS on-board embedded software detects various unit and system faults andreports them as either Major or Minor alarms. AMajor alarm indicates that the system hasfailed in away that directly affects RF transport performance. This usually means that somecalls or perhaps all calls cannot be made over the system. AMinor alarm means that systemperformance is not affected or in some cases, that the performance may no longer be optimal.Four types of faults cause aminor alarm to be reported: overtemperature, fan failure, diversitypath failure, and an external minor fault (user defined fault). All other faults are reported as aMajor alarm.Reporting of Major and Minor alarms is accomplished through the HU alarm contacts, the unitfront panel LED’s, the EMS software Graphical User Interface (GUI), and the NetworkOperations Center -Network Element Manager (NOC/NEM) interface.The HU is equipped with aset of both normally open (NO) and normally closed (NC) alarmcontacts which are used to report both Major and Minor alarms to an external alarm system. Thealarm contacts summarize the inputs so that any Major or Minor alarm will trigger an alarmreport to the external alarm system.The HU, STM, and LPA front panel LED indicators are used to report specific alarms which arereflected in the LED colors: Green, Red, Yellow, and Off. In addition to LED indicators, theLPA is also equipped with aDigital Display that provides status messages. Adescription of theHost Unit, Spectrum Transport Module, and Linear Power Amplifier LED indicators isprovided respectively in Table 5-1,Table 5-2,and Table 5-3.The EMS software GUI provides both asummary and amore detailed list of alarm informationthat includes unit and module level faults, circuit faults, and measured value faults such asvoltages, RF power, and temperature. Asummary showing alist of all systems and their currentalarm status is presented through the Alarm OverView display. Adetailed list of alarminformation is presented through the HOST alarm display and the REMOTE alarm display. Allthe inputs that the system reports as alarms are shown in the HOST and REMOTE alarmdisplays.The NOC/NEM interface provides the same summary and detailed list of alarm information asthe EMS software GUI but in an ASCII text string format. Sending the command GETALARMSUMMARY produces alist of all systems and their current alarm status. Sending thecommand GET ALARM ALL for aspecific system will produce adetailed list of alarminformation for the specified system.
ADCP-75-124 • Issue B • April 2002 • Section 5: MaintenancePage 5-3©2002, ADC Telecommunications, Inc.Table 5-1. Host Unit LED IndicatorsINDICATOR COLOR DESCRIPTIONPOWERGreenOffIndicates if the HU is powered or un-powered.The DC power source is on.The DC power source is off.STANDBYGreen (blinking)Yellow (blinking)Red (blinking)OffIndicates if the HU is in the standby, normal, test, or pro-gram load mode.The HU is in the standby mode.The HU is in the program load mode.The HU is in the test mode.The HU is in the normal mode.HOST UNITGreenYellowRedIndicates if the HU is normal, overheated, or faulty.The HU is normal.High temperature detected in HU.Internal fault detected in the HU or HU/RU band mismatch.REMOTE UNITGreenYellowRedIndicates if an alarm is detected at the RU.No alarms detected at the RU.Aminor alarm is detected at the RU.Amajor alarm is detected at the RU.DRIVEGreenYellowRedIndicates if the forward path RF signal level is normal,above overdrive threshold, or below underdrive threshold.The RF signal level is normalThe RF signal level is below the underdrive threshold.The RF signal level is above the overdrive threshold.PORT 1/PORT 2GreenRedIndicates if the reverse path optical signal received fromthe RU is normal, if no signal is detected, or if errors aredetected.The reverse path optical signal is normal.No reverse path optical signal is received, excessive errors aredetected, or HU can’t communicate with the STM.PORT 3(diversity unitsonly) GreenYellowIndicates if the diversity reverse path optical signalreceived from the RU is normal, if no signal is detected, orif errors are detected.The diversity reverse path optical signal is normal.No diversity reverse path optical signal is received or exces-sive errors are detected.
ADCP-75-124 • Issue B • April 2002 • Section 5: MaintenancePage 5-4©2002, ADC Telecommunications, Inc.Table 5-2. Spectrum Transport Module LED IndicatorsINDICATOR COLOR DESCRIPTIONAC POWERGreenRedIndicates if the STM is powered by the AC power source orthe back-up battery system.The STM is powered by the AC power source.The STM is powered by the back-up battery system.STANDBYGreen (blinking)Yellow (blinking)Red (blinking)OffIndicates if the STM is in the standby, normal, test, or pro-gram load mode.The STM is in the standby mode.The STM is in the program load mode.The STM is in the test mode.The STM is in the normal mode.HOST UNITGreenYellowRedIndicates if an alarm is detected at the HU.No alarms detected at the HU.Aminor alarm is detected at the HU.Amajor alarm is detected at the HU.STMGreenYellowRedIndicates if the STM is normal or faulty.The STM is normal.The STM is over temperature or the fan has failed.Internal fault detected in the STM or HU/RU band mismatch.PAGreenYellowRedIndicates if the LPA is normal, over temperature, has afanfailure, or is faulty.The LPA is normal.The LPA is over temperature or the fan has failed.Internal fault detected in the LPA.VSWRGreenRedIndicates if the forward path VSWR is above or below thethreshold.The VSWR is below the threshold.The VSWR is above the threshold.PORT 1/PORT 2GreenRedIndicates if the forward path optical signal received fromthe HU is normal, if no signal is detected, or if errors aredetected.The forward path optical signal is normal.No forward path optical signal is received, excessive errors aredetected, or the STM can’t communicate with the HU.PORT 3(diversity unitsonly) GreenYellowIndicates if the diversity reverse path optical signalreceived by the HU is normal, if no signal is detected, or iferrors are detected.The diversity reverse path optical signal is normal.No diversity reverse path optical signal is received or exces-sive errors are detected.
ADCP-75-124 • Issue B • April 2002 • Section 5: MaintenancePage 5-5©2002, ADC Telecommunications, Inc.Table 5-3. Linear Power Amplifier LED Indicators and Digital DisplayINDICATOR COLOR DESCRIPTIONFAILOffYellowIndicates if the LPA is normal or faulty.The LPA is normal.Internal fault detected in the LPA.SHUTDOWNOffRedIndicates if the LPA has an RF output or if the RF outputis shutdown.The LPA RF output is on.The LPA RF output is shutdown.DISPLAY MESSAGE DESCRIPTIONADC8500ALARMSNORMAL OPERATIONThe LPA is normal.HUNG CHANGADC-850M Appears every time power is turned on.RESTART AT STANDALONE MODEAppears when LPA is reset.ADC-850S Appears when an alarm has turned off and the LPA is restart-ing after the RESET button has been pressed or the reset com-mand has been supplied from an external source.PLEASE WAIT WHILERESTARTING Appears while the LPA processor is rebooting.DC +12V: +12.0VDC +27V: +27.0VDC +32V: +32.0VDC -12V: -12.0VAlternately displays the voltage flow in each part of the LPA.TEMPER 100.0 ºC Indicates the current temperature of the LPA heat sink.OVER POWER ALARM Output power has exceeded 100 W.HIGH TEMPERATURE Alarm: Temperature of LPA exceeds 85 ºC.VSWR ALARM Reflected LPA power exceeds 20 W.LOOP FAIL General fault occurred in the LPA loops.FANFAIL One or more fans have failed.FORCED SHUTDOWN The RF ON/OFF switch is in the OFF position or the LPA wasset in the disable mode through the EMS computer.Alternating FORCED SHUTDOWNand alarm message An alarm has remained for over 5seconds.DC FAIL+12V-12V+32VVo l ta g e is outside the preset ranges:+11 to +13V-13 to -11V+30 to +34V
ADCP-75-124 • Issue B • April 2002 • Section 5: MaintenancePage 5-6©2002, ADC Telecommunications, Inc.3 FAULT ISOLATION AND TROUBLESHOOTINGAlarm information may be accessed and faults isolated using the information provided by theunit front panel LED indicators, the EMS software GUI alarm displays, or the NOC-EMSinterface. Because the alarm information provided by the EMS GUI and the NOC-EMSinterface is very detailed, refer to Table 5-4,Table 5-5,or Table 5-6 to determine the unit LEDindicator (Host Unit or Remote Unit) that corresponds to the indicated alarm. Then refer toTable 5-7 or Table 5-8 to identify the problem, check out the possible causes, and takecorrective action.Table 5-4. Host Unit Major and Minor AlarmsMAJOR ALARM LED INDICATOR MAJOR ALARM LED INDICATOROperating Mode (Does not apply) Fwd Synth Lock HOST UNIT8Volt HOST UNIT RF Mute (Does not apply)Pri No Light PORT 1/PORT 2MajorExtern Output (Does not apply)Pri Fwd Mux Lock HOST UNIT Companion Lost PORT 1/PORT 2Pri Rev Synth Lock HOST UNIT MINOR ALARMS LED INDICATOROverdrive DRIVE Temperature HOST UNITUnit Mismatch HOST UNIT Sec No Light PORT 3Link Alarm (Does not apply) Sec Errors PORT 33.8 Volt HOST UNIT Sec Rev Synth Lock HOST UNITPri Laser Fail HOST UNIT Underdrive DRIVEPri Errors PORT 1/PORT 2MinorExtern Output (Does not apply)Table 5-5. Remote Unit Major AlarmsMAJOR ALARM LED INDICATOR MAJOR ALARM LED INDICATOROperating Mode (Does not apply) Battery Vo l ta g e ST M3.8 Volt STM Pri Laser Fail STMPri Errors PORT 1/PORT 2FwdSynth Lock STMReference Synth Lock STM System VSWR VSWRLPA DC Fail PA LPA Low Power PALPA VSWR PA Unit Mismatch STMLink Alarm (Does not apply) Converter STMAC Fail AC POWER Pri No Light PORT 1/PORT 28Volt STM Pri Rev Synth Lock STMPri Rev Mux Lock STM LPA Detect PARF Mute (Does not apply) LPA Over Power PALPA Loop Failed PA Companion Lost PORT 1/PORT 2Major Extern Alarm Inp (Does not apply) – –
ADCP-75-124 • Issue B • April 2002 • Section 5: MaintenancePage 5-7©2002, ADC Telecommunications, Inc.During normal HU operation, all LED’s should be green except the STANDBY LED whichshould be Off.When aMinor alarm occurs, one or more of the LED’s will turn yellow.When aMajor alarm occurs, one or more of the LED’s will turn red.Table 5-6. Remote Unit Minor AlarmsMINOR ALARM LED INDICATOR MINOR ALARM LED INDICATORTemperature STM Sec Laser Fail STMSec Rev Mux Lock STM Sec Rev Synth Lock STMRev Path Level (Does not apply) LPA Disable SHUTDOWN (LPA)LPA Fan PA LPA High Temp PAMinor Extern Alarm Inp (Does not apply) RF Out Very Low (Does not apply)Table 5-7. Host Unit Fault Isolation and TroubleshootingAlarm Type LED ColorMinor HOST UNIT YellowPROBLEM: The HU is overheating.POSSIBLE CAUSE CORRECTIVE ACTION/COMMENTS1. Air intake or exhaust opening to HU chassisis blocked2. Ambient temperature >50º C/122º F.3. Faulty fan.1. Remove cause of air-flow blockage.2. Reduce ambient temperature.3. Replace HU fan (See Section 5.3).Alarm Type LED ColorMinor REMOTE UNIT YellowPROBLEM: A minor alarm is detected at the RU. POSSIBLE CAUSE CORRECTIVE ACTION/COMMENTS1. The STM or LPA is overheating. 1. Check RU for alarms and refer to Table 5-8Alarm Type LED ColorMinor DRIVE YellowPROBLEM: The RF input signal level is below the underdrive threshold. POSSIBLE CAUSE CORRECTIVE ACTION/COMMENTS1. Faulty coaxial connection between theHU and the BTS.2. Incorrect attenuation in forward path RF coax-ial link.1. Check forward path signal level at the HU.2. Check Host Forward Attenuator setting andadjust if attenuation is too high.
ADCP-75-124 • Issue B • April 2002 • Section 5: MaintenancePage 5-8©2002, ADC Telecommunications, Inc.Alarm Type LED ColorMajor HOST UNIT RedPROBLEM: Internal fault detected in HU.POSSIBLE CAUSE CORRECTIVE ACTION/COMMENTS1. HU and STM band mismatch.2. The HU has failed.1. Replace HU or STM with correct unit.2. Replace the HU.Alarm Type LED ColorMajor REMOTE UNIT RedPROBLEM: A major alarm is detected at the RU. POSSIBLE CAUSE CORRECTIVE ACTION/COMMENTS1. The STM or LPA has failed, the STM is notreceiving aforward path optical signal, or theRU cabinet door is open.1. Check RU for alarms and refer to Table 5-8.Alarm Type LED ColorMajor DRIVE RedPROBLEM: The RF signal is above the overdrive threshold.POSSIBLE CAUSE CORRECTIVE ACTION/COMMENTS1. Incorrect attenuation in forward path RFcoaxial link. 1. Check Forward Attenuator setting and adjust ifattenuation is too low.Alarm Type LED ColorMajor PORT 1/PORT 2 RedPROBLEM: No reverse path optical signal is received or excessive errors are detected.POSSIBLE CAUSE CORRECTIVE ACTION/COMMENTS1. Faulty reverse path optical link.2. Faulty optical transmit port at the HU or faultyoptical receive port at the STM.1. Test optical link. Clean connector if dirty. Repairor replace optical fiber if faulty. (See Section 4.1).2. Test optical ports. Replace HU or STM if port isfaulty (See Section 4.2).Alarm Type LED ColorMinor PORT 3 YellowPROBLEM: No diversity reverse path optical signal is received or excessive errors are detected.POSSIBLE CAUSE CORRECTIVE ACTION/COMMENTS1. Faulty diversity reverse path optical link.2. Faulty optical transmit port at the HU or faultyoptical receive port at the STM.1. Test optical link. Clean connector if dirty. Repairor replace optical fiber if faulty. (See Section 4.1)2. Test optical ports. Replace HU or STM if port isfaulty (See Section 4.2).Table 5-7. Host Unit Fault Isolation and Troubleshooting, continued
ADCP-75-124 • Issue B • April 2002 • Section 5: MaintenancePage 5-9©2002, ADC Telecommunications, Inc.During normal STM operation, all LED’s should be green except the STANDBY LED whichshould be Off.When aMinor alarm occurs, one or more of the LED’s will turn yellow.When aMajor alarm occurs, one or more of the LED’s will turn red.During normal LPA operation, all LED’s should be Off.Table 5-8. STM and LPA Fault Isolation and TroubleshootingAlarm Type LED ColorMinor STM YellowPROBLEM: The STM is overheating.POSSIBLE CAUSE CORRECTIVE ACTION/COMMENTS1. Air intake or exhaust opening to the remoteunit cabinet is blocked2. Ambient temperature >50º C/122º F.3. Faulty fan.1. Remove cause of air-flow blockage.2. Reduce ambient temperature.3. Replace STM fan (See Section 5.4).Alarm Type LED ColorMinor HOST UNIT YellowProblem: A minor alarm is detected at the HU. POSSIBLE CAUSE CORRECTIVE ACTION/COMMENTS1. The HU is overheating. 1. Check HU for alarms and refer to Table 5-7Alarm Type LED ColorMinor PA YellowPROBLEM: The LPA is overheating. POSSIBLE CAUSE CORRECTIVE ACTION/COMMENTS1. Air intake or exhaust opening to the remoteunit cabinet is blocked2. Ambient temperature >50º C/122º F.3. Faulty fan.1. Remove cause of air-flow blockage.2. Reduce ambient temperature.3. Replace LPA fan (See Section 5.5).Alarm Type LED ColorMajor AC POWER RedPROBLEM: The RU is powered by the back-up battery system POSSIBLE CAUSE CORRECTIVE ACTION/COMMENTS1. The AC power system circuit breaker is openor the AC power has failed. 1. Check the AC power system, repair as needed,and reset circuit breaker.Alarm Type LED ColorMajor HOST UNIT RedPROBLEM: A major alarm is detected at the HU. POSSIBLE CAUSE CORRECTIVE ACTION/COMMENTS1. The HU has failed. 1. Check HU for alarms and refer to Table 5-7.
ADCP-75-124 • Issue B • April 2002 • Section 5: MaintenancePage 5-10©2002, ADC Telecommunications, Inc.Alarm Type LED ColorMajor STM RedPROBLEM: Internal fault detected in STM.POSSIBLE CAUSE CORRECTIVE ACTION/COMMENTS1. HU and STM band mismatch.2. The STM has failed.1. Replace HU or STM with correct unit.2. Replace the STM.Alarm Type LED ColorMajor PA RedPROBLEM: Internal fault detected in LPA.POSSIBLE CAUSE CORRECTIVE ACTION/COMMENTS1. The LPA has failed. 1. Replace the LPA.Alarm Type LED ColorMajor VSWR RedPROBLEM: The forward path VSWR is above the threshold. POSSIBLE CAUSE CORRECTIVE ACTION/COMMENTS1. Faulty antenna. 1. Check the antenna circuit for shorts or opens(including lightning protector).Alarm Type LED ColorMajor PORT 1/PORT 2 RedPROBLEM: No forward path optical signal is received or excessive errors are detected.POSSIBLE CAUSE CORRECTIVE ACTION/COMMENTS1. Faulty forward path optical link.2. Faulty optical transmit port at the STM orfaulty optical receive port at the HU.1. Test optical link. Clean connector if dirty. Repairor replace optical fiber if faulty. (See Section 4.1).2. Test optical ports. Replace HU or STM if port isfaulty (See Section 4.2).Alarm Type LED ColorMinor PORT 3 YellowPROBLEM: No diversity reverse path optical signal is received by the HU or excessive errors are detected.POSSIBLE CAUSE CORRECTIVE ACTION/COMMENTS1. Faulty diversity reverse path optical link.2. Faulty optical transmit port at the STM orfaulty optical receive port at the HU.1. Test optical link. Clean connector if dirty. Repairor replace optical fiber if faulty. (See Section 4.1).2. Test optical ports. Replace HU or STM if port isfaulty (See Section 4.2).Alarm Type LED ColorMajor FAIL YellowPROBLEM: Internal fault detected in the LPA. POSSIBLE CAUSE CORRECTIVE ACTION/COMMENTS1.The LPA has failed. 1. Replace LPATable 5-8. STM and LPA Fault Isolation and Troubleshooting, continued
ADCP-75-124 • Issue B • April 2002 • Section 5: MaintenancePage 5-11©2002, ADC Telecommunications, Inc.4 TEST PROCEDURESThis section provides procedures for common troubleshooting and maintenance tests. Refer tothese procedures as needed when specified in the Fault Isolation and Troubleshooting tables inSection 3.4.1 Optical Power TestAbreak in an optical fiber or afault with the optical connector will interrupt communicationsbetween linked components or generate excessive errors. Use the following procedure to isolateaproblem with an optical fiber or connector.1. Put on the IR filtering safety glasses.2. Notify the NOC or alarm monitoring system operator that the system is going offline.3. At the HU and at the STM, place the On/Off switch in the OFF position (press O).4. Disconnect the optical fiber connectors for the fiber to be tested at the HU and at the STM.5. Inspect the optical connectors. Verify that each connector is clean and that no scratches orimperfections are visible on the fiber end. Clean and polish the optical connector ifnecessary.6. Connect alaser light source to one end of the optical fiber and an optical power meter tothe other end.Alarm Type LED ColorMajor SHUTDOWN RedPROBLEM: The RF output from the LPA is shutdown.POSSIBLE CAUSE CORRECTIVE ACTION/COMMENTS1.The RF ON/OFF switch is in the OFF positionor the LPA was set in the disable mode throughthe EMS computer.2. Breaker switch on LPA is open3. The LPA is faulty.1.Place RF ON/OFF switch in the ON position orenable the LPA.2. Reset breaker switch.3. Replace LPA.Danger: This equipment uses aClass 1Laser according to FDA/CDRH rules. Laser radiationcan seriously damage the retina of the eye. Do not look into the ends of any optical fiber. Do notlook directly into the optical transmitter of any unit or exposure to laser radiation may result.An optical power meter should be used to verify active fibers. Aprotective cap or hood MUSTbe immediately placed over any radiating transmitter or optical fiber connector to avoid thepotential of dangerous amounts of radiation exposure. This practice also prevents dirt particlesfrom entering the connector.Table 5-8. STM and LPA Fault Isolation and Troubleshooting, continued
ADCP-75-124 • Issue B • April 2002 • Section 5: MaintenancePage 5-12©2002, ADC Telecommunications, Inc.7. Verify that the power loss is within specifications. The optical loss budget for 9/125,single-mode fiber is 25 dB (for BER of 10-6). The optical power level should not exceed –15 dBm to avoid overdriving the optical receiver. If the power loss is not withinspecifications, repair or replace the optical fiber and/or connector per local practice.8. Repeat steps 3through 6for each optical fiber that requires testing.9. Reconnect the optical fibers at the HU and the STM.10. When ready to put the system back into service, place the On/Off switch in the ONposition (press I)at both the HU and STM.11. Notify the NOC or alarm monitoring service that the system is going back online.4.2 Optical Loopback TestAfaulty optical port, abreak in an optical fiber, or afault in an optical connector will interruptcommunications between fiber linked components. The following procedures provide tests todetermine if afault exists with the primary optical ports (PORT 1/PORT 2) or with thesecondary optical port (PORT 3).4.2.1 PORT 1/PORT 2 Loopback Test1. Put on the IR filtering safety glasses.2. Notify the NOC or alarm monitoring system operator that the system is going offline.3. At the HU or STM (whichever unit is being tested), place the On/Off switch in the OFFposition (press O).4. Disconnect the optical fiber connectors from the PORT 1and PORT 2optical ports andplace adust cap over each connector.5. Plug a15 dB in-line optical attenuator into the PORT 1optical port.6. Connect apatch cord between the optical attenuator and the PORT 2optical port.7. Place the On/Off switch in the ON position (press I)and observe the PORT 1/PORT 2LED indicator.8. The PORT 1/PORT 2LED indicator will turn either red or green. If the LED turns red, theprimary optical transmitter or receiver is faulty. Replace the unit and then recheck systemoperation. If the LED turns green, the optical ports are good.9. Place the On/Off switch in the OFF position (press O).10. Remove the optical attenuator from the PORT 1optical port.Danger: This equipment uses aClass 1Laser according to FDA/CDRH rules. Laser radiationcan seriously damage the retina of the eye. Do not look into the ends of any optical fiber. Do notlook directly into the optical transmitter of any unit or exposure to laser radiation may result.An optical power meter should be used to verify active fibers. Aprotective cap or hood MUSTbe immediately placed over any radiating transmitter or optical fiber connector to avoid thepotential of dangerous amounts of radiation exposure. This practice also prevents dirt particlesfrom entering the connector.
ADCP-75-124 • Issue B • April 2002 • Section 5: MaintenancePage 5-13©2002, ADC Telecommunications, Inc.11. Remove the dust caps from the optical fiber connectors.12. Clean each connector (follow connector supplier’s recommendations) and then insert eachconnector into the appropriate optical port.13. When ready to put the unit back into service, place the On/Off switch in the ON position(press I).14. Notify the NOC or alarm monitoring service that the system is going back online.4.2.2 PORT 3 Loopback Test1. Put on the IR filtering safety glasses.2. Notify the NOC or alarm monitoring system operator that the system is going offline.3. At the HU or STM (whichever unit is being tested), place the On/Off switch in the OFFposition (press O).4. Disconnect the optical fiber connectors from the PORT 1and PORT 3optical ports andplace adust cap over each connector.5. Plug a15 dB in-line optical attenuator into the PORT 3optical port.6. Connect apatch cord between the optical attenuator and the PORT 1optical port.7. Place the On/Off switch in the ON position (press I)and observe the PORT 3LEDindicator.8. The PORT 3LED indicator will turn either red or green. If the LED turns yellow, thesecondary optical transmitter or receiver is faulty. Replace the unit and then rechecksystem operation. If the LED turns green, the optical ports are good.9. Place the On/Off switch in the OFF position (press O).10. Remove the optical attenuator from the PORT 3optical port.11. Remove the dust caps from the optical fiber connectors.12. Clean each connector (follow connector supplier’s recommendations) and then insert eachconnector into the appropriate optical port.13. When ready to put the unit back into service, place the On/Off switch in the ON position(press I).14. Notify the NOC or alarm monitoring service that the system is going back online.5 MAINTENANCE PROCEDURESThis section specifies the system maintenance requirements and provides the procedures for therequired maintenance tasks. Refer to these procedures as needed when specified in theScheduled Maintenance table.
ADCP-75-124 • Issue B • April 2002 • Section 5: MaintenancePage 5-14©2002, ADC Telecommunications, Inc.5.1 Scheduled MaintenanceTable 5-9 lists the items that require regular maintenance and the recommended maintenanceinterval. Refer to the section specified in the table for the required maintenance or testprocedure.5.2 Remote Unit Cabinet Filter Cleaning ProcedureThe RU cabinet filter cleans the RU intake air before it enters the cabinet. The filter should becleaned approximately once per year and more often in extremely dirty environments. If thecabinet temperature gradually rises over along period of time and there are no fan failures, it ispossible that the filter is dirty and requires cleaning. Use the following procedure to clean theRU cabinet filter:1. Open the RU cabinet door as shown in Figure 5-1.2. Loosen the hex nuts that secure the left and right filter brackets to the cabinet door.3. Pull the filter upward and away from the cabinet door. Be careful not to damage the gasketthat provides the air seal.Table 5-9. Scheduled MaintenanceINTERVAL ITEM REQUIREMENT1month Battery* Check float voltage.Check system ambient temperature.Check system float current.6months Battery* Perform 1month scheduled maintenance tasks.Check individual battery terminal temperature.Check individual battery float voltages.12 months Battery *RU cabinet filter**Perform 1and 6month scheduled maintenance tasksComplete detailed physical inspection.Re-torque terminal connections.Perform general system maintenance.Perform cabinet maintenance.Remove and clean the RU cabinet filter. Refer to Section 5.2for the required procedure.24 months Battery* Perform 1, 6, and 24 month scheduled maintenance tasks.Test battery system for rated capacity.60 months HU FansSTM FanLPA FansRemove and replace the cooling fans in the HU, STM, andLPA. Refer to specified section for the required procedures:HU see Section 5.3,Section 5.4,and LPA see Section 5.5.*Refer to the PRC-SERIES OPERATING AND FIELD SERVICE MANUAL (provided with theback-up battery system) for the specified battery maintenance procedures.**Though it is not recommended that the RU be installed in asalt-air environment, if done so, clean thecabinet filter on amonthly basis instead of on a12 month basis. In addition, the RU should beinspected for corrosion due to salt, particularly near the fans and around the connectors. The MTBF ofthe RU may be impacted if the RU is exposed to salt-air.
ADCP-75-124 • Issue B • April 2002 • Section 5: MaintenancePage 5-15©2002, ADC Telecommunications, Inc.Figure 5-1. Air Filter Removal and Replacement4. Gently tap the filter against your hand to dislodge the dirt. If necessary, use compressed airor avacuum cleaner to remove the dirt.5. Re-install the filter in the door and tighten the hex nuts that secure the left and rightbrackets to the door.5.3 Host Unit Fan Replacement ProcedureThe HU is equipped with two cooling fans which are located on the right side of the HUenclosure. The cooling fans blow cool air into the enclosure. Heated air is exhausted through thevent openings on the left side of the enclosure. Replacement of the fans requires that the HU beturned off for ashort period of time. Use the following procedure to remove and replace the HUcooling fans:1. Before working on the HU or handling afan, slip on an Electro-Static Discharge (ESD)wrist strap and connect the ground wire to an earth ground source. Wear the ESD wriststrap while completing each section of the fan installation procedure.2. Notify the NOC or alarm monitoring system operator that the system is going offline.3. Place the HU On/Off switch in the OFF position (press O).4. Remove the six flat-head screws (requires TORX screwdriver with T10 bit) that secure thefan/grill assembly to the right side of the HU enclosure as shown in Figure 5-2.Savescrews for reuse.Warning: Electronic components can be damaged by static electrical discharge. To preventESD damage, always wear an ESD wrist strap when working on the HU, STM, or LPA andwhen handling electronic components.LOOSEN HEX NUTS ON BOTHSIDES OF AIR FILTERLIFT AIR FILTER UP ANDAWAY FROM DOOR16983-A
ADCP-75-124 • Issue B • April 2002 • Section 5: MaintenancePage 5-16©2002, ADC Telecommunications, Inc.Figure 5-2. Host Unit Fan/Grill Assembly Removal5. Carefully withdraw the fan/grill assembly from the enclosure until the wiring harness isexposed and the connectors are accessible.6. Lift the small latch on each wiring harness connector and carefully unplug each connectorfrom the circuit board connector.7. Remove the plastic rivets that secure each fan to the grill by pushing outward on the rivetcenter post until the rivet can be withdrawn from the grill as shown in Figure 5-3.Figure 5-3. Removing Host Unit Fans From Grill8. Remove both fans from the grill9. Use the rivets removed in step 7to secure the replacement fans to the grill. Orient each fanso the wiring harness is on the top and the arrow on the fan points into the enclosure.10. Connect the two wiring harness connectors to the circuit board connectors.11. Secure the fan/grill assembly to the side of the enclosure (see Figure 5-2)using the sixflat-head screws removed in step 4.16986-A16173-B
ADCP-75-124 • Issue B • April 2002 • Section 5: MaintenancePage 5-17©2002, ADC Telecommunications, Inc.12. Place the HU On/Off switch in the ON position (press I).13. Verify that the fans run properly following power-up.14. Notify the NOC or alarm monitoring system operator that the system is going back online.5.4 Spectrum Transport Module Fan Replacement ProcedureThe STM is equipped with arear cooling fan that exhausts heated air from the STM enclosure.Cool air enters the STM through vent openings on the side of the enclosure. Replacement of thefan requires that the STM be turned off for ashort period of time and that the STM be removedfrom the cabinet. Use the following procedure to remove and replace the STM cooling fan.1. Before working on the STM or handling afan, slip on an Electro-Static Discharge (ESD)wrist strap and connect the ground wire to an earth ground source. Wear the ESD wriststrap while completing each section of the fan installation procedure.2. Notify the NOC or alarm monitoring system operator that the system is going offline.3. Place the STM On/Off switch in the OFF position (press O).4. Disconnect the various power, fiber optic, service, alarm wiring, and coaxial cableconnectors from the STM front panel as specified in Figure 5-4.Figure 5-4. Spectrum Transport Module Cable ConnectionsWarning: Electronic components can be damaged by static electrical discharge. To preventESD damage, always wear an ESD wrist strap when working on the HU, STM, or LPA andwhen handling electronic components.16991-ADisconnect ACpower connectorDisconnect back-up batteryDC power connectorDisconnect alarmconnectorDisconnect diversityantenna connector(if present)Disconnect antennaconnector1234567Disconnect optical fiberconnectors. Place a dustcap over each cableconnector and port adapter. Disconnect serviceconnector (if present)
ADCP-75-124 • Issue B • April 2002 • Section 5: MaintenancePage 5-18©2002, ADC Telecommunications, Inc.5. Loosen the captive screws that secure the STM to the RU cabinet mounting shelf andcarefully withdraw the STM from the cabinet.6. Remove the four pan-head screws (requires TORX screwdriver with T10 bit) that securethe fan/grill assembly to rear side of the STM enclosure as shown in Figure 5-5.Savescrews for reuse.Figure 5-5. STM Fan/Grill Assembly Removal7. Carefully withdraw the fan/grill assembly from the enclosure until the wiring harness isexposed and the connector is accessible.8. Lift the small latch on the wiring harness connector and carefully unplug the connectorfrom the circuit board connector.9. Remove the plastic rivets that secure the fan to the mounting plate and grill by pushingoutward on the rivet center post until the rivet can be withdrawn as shown in Figure 5-6.10. Separate fan from the mounting plate and grill11. Use the rivets removed in step 9to secure the replacement fan to the mounting plate andgrill. Orient the fan so the wiring harness is on the top and the arrow on the fan pointsaway from the enclosure. Make certain the rubber grommets are left in place on themounting plate.12. Connect the wiring harness connector to the circuit board connector.13. Secure the fan/grill assembly to the back of the enclosure (see Figure 5-5)using the fourpan-head screws removed in step 6. Do not overtighten the screws. The screw threads canbe easily stripped if too much torque is used to tighten the screws.16992-A
ADCP-75-124 • Issue B • April 2002 • Section 5: MaintenancePage 5-19©2002, ADC Telecommunications, Inc.Figure 5-6. Removing STM Fan From Mounting Plate and Grill14. Re-install the STM in the cabinet and then re-connect all cables in the reverse order inwhich they were disconnected (see Figure 5-4).15. Place the STM On/Off switch in the ON position (press I).16. Verify that the fan runs properly following power-up.17. Notify the NOC or alarm monitoring system operator that the system is going back online.5.5 Linear Power Amplifier Fan Replacement ProcedureThe LPA is equipped with both afront and rear cooling fan. The front fan draws cool air into theLPA enclosure and the rear fan exhausts heated air from the LPA enclosure. Replacement of thefans requires that the STM be turned off for ashort period of time and that the LPA be removedfrom the cabinet. Use the following procedure to remove and replace the LPA cooling fans.1. Before working on the LPA or handling afan, slip on an Electro-Static Discharge (ESD)wrist strap and connect the ground wire to an earth ground source. Wear the ESD wriststrap while completing each section of the fan installation procedure.2. Notify the NOC or alarm monitoring system operator that the system is going offline.3. Place the STM On/Off switch in the OFF position (press O).4. Loosen the captive screws that secure the LPA to the RU cabinet mounting shelf andcarefully withdraw the LPA from the cabinet.5. Pull out the four retainers that secure the front fan to the LPA as shown in Figure 5-7 andsame for reuse.Warning: Electronic components can be damaged by static electrical discharge. To preventESD damage, always wear an ESD wrist strap when working on the HU, STM, or LPA andwhen handling electronic components.16993-A
ADCP-75-124 • Issue B • April 2002 • Section 5: MaintenancePage 5-20©2002, ADC Telecommunications, Inc.Figure 5-7. LPA Fan Removal and Replacement6. Carefully withdraw the fan assembly from the LPA until the wiring harness is exposed andthe RJ-45 wiring harness connector is accessible.7. Disconnect the fan wiring harness connector from the LPA and lift the fan assembly awayfrom the LPA.8. Place asmall amount of anti-corrosion gel on the connector of the replacement fanassembly.9. Orient the fan assembly so the air-flow arrow points into the LPA.10. Connect the fan assembly wiring harness connector to the LPA internal connector.11. Secure the fan assembly to the LPA using the four retainers removed in step 5.12. Replace the rear fan assembly using the same procedure covered in steps 5through 11except orient the rear fan so the air-flow arrow is pointing away from the LPA.13. When both fan assemblies have been replaced, re-install the LPA in the cabinet.14. Place the STM On/Off switch in the ON position (press I)and verify that both fans operateproperly. The front fan should draw air into the LPA and the rear fan should blow air out ofthe LPA.15. Notify the NOC or alarm monitoring system operator that the system is going back online.16994-APULL ON RETAINERS TO REMOVE FAN
ADCP-75-124 • Issue B • April 2002 • Section 6: General InformationPage 6-1©2002, ADC Telecommunications, Inc.SECTION 6: GENERAL INFORMATION1 WARRANTY/SOFTWARE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-12 SOFTWARE SERVICE AGREEMENT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-13 REPAIR/EXCHANGE POLICY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-14 REPAIR CHARGES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-25 REPLACEMENT/SPARE PRODUCTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-26 RETURNED MATERIAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-27 CUSTOMER INFORMATION AND ASSISTANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-3_________________________________________________________________________________________________________1 WARRANTY/SOFTWAREThe Product and Software warranty policy and warranty period for all ADC Products ispublished in ADC’s Warranty/Software Handbook. Contact the Technical Assistance Center at1-800-366-3891, extension 73475 (in U.S.A. or Canada) or 952-917-3475 (outside U.S.A. andCanada) for warranty or software information or for acopy of the Warranty/SoftwareHandbook.2 SOFTWARE SERVICE AGREEMENTADC software service agreements for some ADC Products are available at anominal fee.Contact the Technical Assistance Center at 1-800-366-3891, extension 73475 (in U.S.A. orCanada) or 952-917-3475 (outside U.S.A. and Canada) for software service agreementinformation.3 REPAIR/EXCHANGE POLICYAll repairs of ADC Products must be done by ADC or an authorized representative. Anyattempt to repair or modify ADC Products without written authorization from ADC voids thewarranty.If amalfunction cannot be resolved by the normal troubleshooting procedures, call theTechnical Assistance Center at 1-800-366-3891, extension 73475 (in U.S.A. or Canada) or952-917-3475 (outside U.S.A. and Canada). Atelephone consultation can sometimes resolve aproblem without the need to repair or replace the ADC Product.If, during atelephone consultation, ADC determines the ADC Product needs repair, ADC willauthorize the return of the affected Product for repair and provide aReturn MaterialAuthorization number and complete return shipping instructions. If time is critical, ADC canarrange to ship the replacement Product immediately. In all cases, the defective Product must becarefully packaged and returned to ADC.Content Page
ADCP-75-124 • Issue B • April 2002 • Section 6: General InformationPage 6-2©2002, ADC Telecommunications, Inc.4 REPAIR CHARGESIf the defect and the necessary repairs are covered by the warranty, and the applicable warrantyperiod has not expired, the Buyer’s only payment obligation is to pay the shipping cost to returnthe defective Product. ADC will repair or replace the Product at no charge and pay the returnshipping charges.Otherwise, ADC will charge apercentage of the current Customer Product price for the repairor NTF (No Trouble Found). If an advance replacement is requested, the full price of anew unitwill be charged initially. Upon receipt of the defective Product, ADC will credit Buyer with 20percent of full price charged for any Product to be Out-of-Warranty. Products must be returnedwithin thirty (30) days to be eligible for any advance replacement credit. If repairs necessitate avisit by an ADC representative, ADC will charge the current price of afield visit plus round triptransportation charges from Minneapolis to the Buyer’s site.5 REPLACEMENT/SPARE PRODUCTSReplacement parts, including, but not limited to, button caps and lenses, lamps, fuses, and patchcords, are available from ADC on aspecial order basis. Contact the Technical Assistance Centerat 1-800-366-3891, extension 73475 (in U.S.A. or Canada) or 952-917-3475 (outside U.S.A.and Canada) for additional information.Spare Products and accessories can be purchased from ADC. Contact Sales Administration at1-800-366-3891, extension 73000 (in U.S.A. or Canada) or 1-952-938-8080 (outside U.S.A.and Canada) for aprice quote and to place your order.6 RETURNED MATERIALContact the ADC Product Return Department at 1-800-366-3891, extension 73748 (in U.S.A. orCanada) or 952-917-3748 (outside U.S.A. and Canada) to obtain aReturn MaterialAuthorization number prior to returning an ADC Product.All returned Products must have aReturn Material Authorization (RMA) number clearlymarked on the outside of the package. The Return Material Authorization number is valid for 90days from authorization.
Page 6-3ADCP-75-124 • Issue B • April 2002 • Section 6: General Information7 CUSTOMER INFORMATION AND ASSISTANCE©2002, ADC Telecommunications, Inc.All Rights ReservedPrinted in U.S.A .EUROPESales Administration: +32-2-712-65 00Technical Assistance: +32-2-712-65 42U.S.A. OR CANADASales: 1-800-366-3891 Extension 73000Technical Assistance: 1-800-366-3891 Extension 73475ELSEWHERESales Administration: +1-952-938-8080Technical Assistance: +1-952-917-347513944-IWWW.ADC.COMtechnical@adc.comADC TELECOMMUNICATIONS, INCPO BOX 1101,MINNEAPOLIS, MN 55440-1101, USAU.S.A.U.S.A.ADC EUROPEAN CUSTOMER SERVICE, INCBELGICASTRAAT 2,1930 ZAVENTEM, BRUSSELS, BELGIUMPRODUCT INFORMATION AND TECHNICAL ASSISTANCE:WRITE:PHONE:SYSTEM INTEGRATION DIVISION (SID)800.366.3891 (press star and choose option 4) (US & Canada)+1-952.917.3000 Ask for Systems Integration (Direct Dial)Contents herein are current as of the date of publication. ADC reserves the right to change the contents without prior notice.In no event shall ADC be liable for any damages resulting from loss of data, loss of use, or loss of profits and ADC furtherdisclaims any and all liability for indirect, incidental, special, consequential or other similar damages. This disclaimer ofliability applies to all products, publications and services during and after the warranty period. This publication may beverified at any time by contacting ADC's Technical Assistance Center.
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