ADC Telecommunications DISSMRAA Digivance Indoor Coverage Solution System User Manual 75136 CV

ADC Telecommunications Inc Digivance Indoor Coverage Solution System 75136 CV

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ADCP-75-136 • Issue 1 • November 2002 Page 33 ©2002, ADC Telecommunications, Inc.5. Insert the optical transceiver into the socket until it locks into place.6. Replace the optical transceiver dust cap if it was removed for installation.7. Repeat procedure for each optical transceiver that requires installation.8. Install a port cover (see Figure 18) over each unused optical transceiver socket.4.8 Ports 1–6 Optical Connections The optical interface between the DHU and each DEU or DRU is supported by six opticalports. Each of the six optical ports provides aduplex LC-type optical transceiver which ismounted on the DHU front panel. One side of the transceiver provides the optical fiberconnection for the forward path (downlink) signal. The other side of the transceiver providesthe optical fiber connection for the reverse path (uplink) signal. Use the following procedure toinstall the forward and reverse path optical fibers and to connect them to the DHU: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. Donot look directly into the optical transceiver of any digital unit or exposure to laser radiationmay result. An optical power meter should be used to verify active fibers. Aprotective cap orhood MUST be immediately placed over any radiating transceiver or optical fiber connectorto avoid the potential of dangerous amounts of radiation exposure. This practice also preventsdirt particles from entering the transceiver or connector.1. Obtain the required lengths of single- or multi-mode fiber optic cable.2. Route the fiber optic cable between the DHU and the DEU or DRU (if not alreadyrouted) and cut to required length. Allow sufficient slack for dressing and organizing thecables at each unit. Maintain aminimum bend radius of 2 inches (50 mm).Note:The maximum path lengths for the optical fibers are as follows: 500 meters (1,641feet) for 62.5 micron core multi-mode fiber, 750 meters (2,461 feet) for 50 micron coremulti-mode fiber, and 10 km (32,808 ft) for 9micron core single-mode fiber.3. Terminate each optical fiber with afield-installable LC type fiber optic connector asshown in Figure 19. Follow the instructions provided by the connector manufacturer forinstalling the connector.4. Test each fiber for optical loss as described in Subsection 6.4.2 of this manual.5. Designate one of the fibers as the forward path fiber and the other as the reverse pathfiber and label both ends of each fiber with the path designation.6. Use the plastic joiner provided with the LC connectors to join the DHU Port 1forwardand reverse path connectors together (see Figure 19). Make sure the forward path andreverse path connectors are oriented as shown.Note:When viewing any Port 1-6 optical transceiver from the front, the forward path port ison the left and the reverse path port is on the right as shown in Figure 20. In addition, single-mode transceivers are colored blue and multi-mode transceivers are colored black or beige.Both single- and multi-mode transceivers may be mounted on the same DHU.FCC ID: F8I-DISSMRAA, Partial User Manual, 3 of 4
ADCP-75-136 • Issue 1 • November 2002 Page 34 ©2002, ADC Telecommunications, Inc.17274-AREVERSE PATH (RX)CONNECTORFORWARD PATH (TX)CONNECTOROPTICAL CONNECTORASSEMBLY DETAILPORT 1 OPTICALTRANSCEIVEROPTICALCONNECTORCABLEGUIDESCABLE GUIDEDETAILDESIGNATION CARD AND HOLDER DETAILHOLDERCARDCLEARPLASTICCOVERFigure 19. Ports 1–6 Fiber Optic Cable Connections 17150-ADETAIL DRAWING OFOPTICAL PORTREVERSEPATH (RX)FORWARDPATH (TX)DUST CAP (LEAVE IN PLACEUNTIL READY TO INSTALL CONNECTOR)TRANSCEIVER COLOR CODEBLUE = SINGLE-MODE (9 MICRON)BLACK/BEIGE = MULTI-MODE (50 OR 62.5 MICRON)Figure 20. Optical Transceiver Designations
ADCP-75-136 • Issue 1 • November 2002 Page 35 ©2002, ADC Telecommunications, Inc.7. Remove the dust caps from the optical fiber connectors and the port 1optical transceiver.Note:Leave the dust cap in place on any unused optical transceiver.8. Clean each connector (follow connector supplier’s recommendations) and then insert theoptical fiber connector pair into DHU optical port 1 (see Figure 19).9. Place the optical fibers within the cable guides provided on the cable management tray (seeFigure 19) and then dress and secure the fibers at the DHU per standard industry practice.10. Connect the forward and reverse path optical fibers to the DEU or the DRU as specifiedin the instructions provided with that unit.11. Use the designation card provided (see Figure 19) to indicate the location and name ofthe DRU or DEU that is connected to each optical fiber pair. The designation card holdermay be attached to any convenient flat surface such as the DHU cable management tray12. Repeat steps 1–11 for each remaining optical port.4.9 DC Power Connections The DC power interface between the DHU and each DRU is supported by six RJ-45 femaleconnectors. Each DHU RJ-45 connector provides nominal 48 Vdc power for the associatedDRU except when the DRU is powered with an ac/dc converter. A category 3 or 5 twisted paircable is used to feed the power from the DHU to the DRU. Use the following procedure toinstall the DC power cable and to connect it to the DHU.1. Obtain the required length of category 3 or 5 twisted pair cable.2. Route the cable between the DHU and the DRU (unless already routed) and then cut torequired length. Allow sufficient slack for dressing and organizing the cable at the DHU.Note:The maximum distance for routing power cable is 500 meters (1,641 feet).3. Terminate each end of the cable with amale RJ-45 connector. Match the wire color tothe connector pin as specified in Table 6.Caution:The DRU will be damaged if the RJ-45 connector is wired incorrectly.4. Perform acontinuity test to verify that each wire is properly connected to the terminatingRJ-45 connector and check the connector for correct polarity (see diagram in Table 6).Table 6. RJ-45 Connector Pin Designations PIN NUMBER WIRE COLOR CONNECTOR PINS 12345678White/GreenGreenWhite/OrangeOrangeWhite/BlueBlueWhite/BrownBrownPIN1PIN8+48 VDC ON PINS 1, 3, 5, AND 7RETURN ON PINS 2, 4, 6, AND 816180-A
ADCP-75-136 • Issue 1 • November 2002 Page 36 ©2002, ADC Telecommunications, Inc.5. Connect the DC power cable to the DHU port 1 DC PWR jack as shown in Figure 21.6. Place the DC power cable within the cable guides provided (see Figure 21) and thendress and secure the cable at the DHU per standard industry practice.17275-ARJ-45 CONNECTORDETAILPORT 1 DC POWERCONNECTORRJ-45CONNECTORCABLEGUIDESCABLE GUIDEDETAIL18Figure 21. 48 Vdc Power Cable Connection 7. Connect the DC power cable to the DRU as specified in the instructions provided withthat unit.8. Repeat steps 1–7 for each remaining DRU that will be powered by the DHU.4.10 External Alarm System Connections The alarm interface between the DHU and an external alarm system is supported by a six-terminal plug (with screw-type terminals) that connects to areceptacle mounted on the DHUfront panel. The terminal plug provides connections to normally open (NO) and normallyclosed (NC) dry type alarm contacts for both minor and major alarms. Acategory 3 or 5 cableis typically used to connect the DHU to the external alarm system. Use the followingprocedure to install the alarm wiring and connect it to the DHU:1. Obtain the required length of category 3 or 5 cable.2. Route the cable between the DHU and the external alarm system (if not already routed)and then cut to required length. Allow sufficient slack for dressing and organizing thecable at the DHU.
ADCP-75-136 • Issue 1 • November 2002 Page 37 ©2002, ADC Telecommunications, Inc.3. Strip back the outer cable sheath and insulation to expose the wires at both ends of thecable and strip back 0.2 inches (5 mm) of insulation each wire.4. Connect the Major alarm wire pair to the MAJOR COM/NC or MAJOR COM/NOterminals (whichever is required by the external alarm system) on the DHU alarmterminal connector (supplied with DHU) as shown in Figure 22.17278-AALARMCONNECTORRECEPTACLEMAJORALARMWIRESMINORALARMWIRESALARM CONNECTORDETAILALARMCONNECTORNOCOM NCMINORNO COMNCMAJORFigure 22. External Alarm System Connections 5. Connect the Minor alarm wire pair to the MINOR COM/NC or MINOR COM/NOterminals (whichever is required by the external alarm system) on the DHU alarmterminal connector as shown in Figure 22.6. Insert the alarm terminal connector into the receptacle on the DHU front panel.7. Connect the Major and Minor alarm wire pairs to the appropriate terminals on theexternal alarm system.8. Dress and secure cable per standard industry practice.4.11 AC Power Connections The AC power interface between the DHU and the AC power source is supported by a 3-wireAC power cord connector located on the DHU front panel. The AC connector provides aconnection point for the power cord which is provided separately with the DHU. Use thefollowing procedure to install the AC power cord:
ADCP-75-136 • Issue 1 • November 2002 Page 38 ©2002, ADC Telecommunications, Inc.1. Locate the AC power cord which is provided separately with the DHU. Use only the ACpower cord provided with the DHU or an equivalent UL/CUL listed 3-conductor, 18AWG cord terminated in amolded-on plug cap rated 125 V, 15 A with amaximumlength of 6 feet (1.8 m).Note:The DHU is intended to be used with a 3-wire grounding type plug which has agrounding pin. Equipment grounding is required to ensure safe operation. Do not defeatthe grounding means. Verify DHU is reliably grounded when installed.2. Place the DHU AC power ON/OFF switch, shown in Figure 23, in the OFF position(press O).17276-AAC POWER CORDFigure 23. AC Power Connection 3. Connect the receptacle end of the power cord to the AC connector on the DHU.4. Route the plug end of the power cord to the specified AC outlet (per the system design)and connect plug to outlet.Warning:The current rating of the DHU is 2.0 Amps at 120 Vac.Avoid overloading circuitswhich may cause damage to over-current protection devices and supply wiring.5. Dress and secure cable per standard industry practice.6. When all units of the Digivance ICS have been installed, refer to Section 4 of thismanual for the system power up and test procedures.4.12 Create As-Built Drawing Following installation, create an “as-built” drawing of the complete Digivance ICS system.Using adrawing of the building floor plan, show the installed location of each piece ofequipment including the various Digivance electronic units, the antennas, the interface units,and the microcell (if used). In addition, show the location and routing of all copper, coaxial,and fiber optic cable runs used with the system. Retain the as-built drawing for reference whentroubleshooting or when planning for system expansion.
ADCP-75-136 • Issue 1 • November 2002 Page 39 ©2002, ADC Telecommunications, Inc.5 SYSTEM OPERATION This section provides guidelines for turning-up the Digivance ICS, verifying that all units areoperating properly, testing to ensure that all performance requirements are satisfied, andcorrecting any installation problems. This process assumes that the various units that comprisethe Digivance ICS have been installed in accordance with the system design plan and the BTSinterface device has been installed and tested.5.1 Tools and Materials The following tools and materials are required in order to complete the procedures in thissection:• Portable spectrum analyzer• Portable test transmitter• Cell phone• Pencil or pen• Writing pad5.2 Turn-Up System and Verify Operation The process of turning-up the system and verifying operation involves powering up thevarious system components and then verifying that the LED indicators show normal operation.Refer to Tables 7, 8, and 9as needed for acomplete description of the unit LED indicators.Use the following procedure to power-up the system. If any unit does not respond asdescribed, refer to Subsection 5.3 for the correction procedures.1. Temporarily disconnect the alarm system or notify alarm system provider that testing isin progress.2. Verify that each AC powered unit is connected to the appropriate outlet.3. Place the ON/OFF switch on the DHU in the ON position (press I).4. Verify that the UNIT LED and the OVERDRIVE LED on the DHU turn yellow (forapproximately 6seconds) and then green.5. Place the PORT 1ON/OFF switch on the DHU in the ON position (press I).6. If aDEU is connected to port 1, proceed to step 7. If aDRU is connected to port 1, skipsteps 7and 8and proceed to step 9.7. Place the ON/OFF switch on the DEU in the ON position (press I).8. Verify that the UNIT LED on the DEU turns yellow (for approximately 6seconds) andthen green.9. Verify that the PORT 1OK/NOK LED on the DHU turns yellow (for approximately 6seconds) and then green.10. If aDEU is connected to PORT 1, proceed to step 11. If aDRU is connected to PORT 1,skip steps 11 through 13 and proceed to step 14.
ADCP-75-136 • Issue 1 • November 2002 Page 40 ©2002, ADC Telecommunications, Inc.11. Verify that the HOST PORT LED on the DEU turns green.12. Place the PORT 1ON/OFF switch on the DEU in the ON position (press I).13. Verify that the PORT 1OK/NOK LED on the DEU turns yellow (for approximately sixseconds) and then green.14. Verify that the STATUS LED on the DRU connected to PORT 1turns yellow (forapproximately six seconds) and then green.15. Repeat the procedure covered in steps 5through 14 for each of the remaining DHUoptical ports (ports 2through 6) that is connected to aDEU or a DRU.16. Reconnect the alarm system and notify alarm system provider that system is operational.Table 7. Digital Host Unit LED Indicators INDICATOR COLOR DESCRIPTION UNITLED GreenYellowRedOffIndicates when the DHU is normal or faulty.DHU in normal state, no faults detected.DHU high temperature fault detected. (see Note)DHU fault detected (see Note).AC power off to DHU or DHU internal fault.PORT 1–6OK/NOKLEDs GreenYellowRed(steady)Red(blinking)OffIndicates if any connected DEU or DRU is normal or faulty or if theoptical inputs from any connected DEU or DRU are normal or lost.All connected units in normal state, no faults detected.High temperature fault detected in connected DEU. (see Note)Fault detected in aconnected DEU or DRU. (see Note)No reverse path optical signal detected from aconnected DEU or DRU orexcessive reverse path errors detected from aconnected DEU or DRU.(see Note)Port disabled (via front panel switch) or DHU internal fault.OVERDRIVELEDGreenRedIndicates when the forward path RF input is below or above theoverdrive threshold.RF input signal level at DHU below overdrive threshold.RF input signal level at DHU above overdrive threshold.Note:Detection of any fault will generate an alarm. A high temperature fault will generate aminoralarm (yellow LED). All other types of faults will generate amajor alarm (red LED).
ADCP-75-136 • Issue 1 • November 2002 Page 41 ©2002, ADC Telecommunications, Inc.Table 8. Digital Expansion Unit LED Indicators INDICATOR COLOR DESCRIPTION UNITLED GreenYellowRedOffIndicates when the DEU is normal or faulty.DEU in normal state, no faults detected.DEU high temperature fault detected. (see Note)DEU internal fault detected. (see Note)AC power off to DEU or DEU internal fault.HOST PORTLEDGreenRed(blinking)OffIndicates when the optical inputs from the DHU or supportingDEU are normal or lost.DHU or supporting DEU in normal state, no faults detected.No forward path optical signal detected from DHU or supporting DEUor excessive forward path errors detected from DHU or supportingDEU. (see Note).DEU internal fault.PORT 1–6OK/NOKLEDs GreenYellowRed(steady)Red(blinking)OffIndicates if any connected DEU or DRU is normal or faulty or if theoptical inputs from any connected DEU or DRU are normal or lost.DRU or remote DEU in normal state, no faults detected.High temperature fault detected in connected DEU. (see Note)Fault detected in aconnected DEU or DRU. (see Note)No reverse path optical signal detected from aconnected DEU or DRUor excessive reverse path errors detected from aconnected DEU orDRU.Port disabled (via front panel switch) or DEU internal fault.Note:Detection of any fault will generate an alarm. A high temperature fault will generate aminoralarm (yellow LED). All other types of faults will generate amajor alarm (red LED).Table 9. Digital Remote Unit LED Indicator INDICATOR COLOR DESCRIPTION STATUSLEDGreenRed(steady)Red(blinking)OffIndicates if the DRU is normal or faulty or if the forward path opticalinputs to the DRU are normal or lost.DRU in normal state, no faults detected.DRU internal fault detected. (See Note)No forward path optical signal from the DHU or DEU detected.DC power off to DRU or DRU internal fault.Note:Detection of any fault will generate an alarm. A high temperature fault will generateaminor alarm (yellow LED). All other types of faults will generate amajor alarm (red LED).
ADCP-75-136 • Issue 1 • November 2002 Page 42 ©2002, ADC Telecommunications, Inc.5.3 Test System Performance Testing the performance of the system involves completing various RF tests and telephoneservice tests that verify if the system is functioning properly. Use the following procedure totest the system performance:1. Verify that the forward path (downlink) input signal level at the DHU is optimized. The peakCOMPOSITE forward path input signal level at the DHU should be set at –20 dBm.Note:In aCDMA system, the power level is dependent on the traffic. For optimumoperation in aCDMA system, the input signal level should be set below the level of thepilot signal.2. Verify that the reverse path (uplink) signal level at the local BTS or donor antenna isoptimized. Note that the reverse path output signal level required is dependent on serviceprovider signal to noise requirements, ICS system noise floor, the service providerequipment, and the system configuration.3. Check and record the Received Signal Strength Indication (RSSI) and any spuriousemission levels at and between all DRU antennas. Analyze all DRU’s and the DHUinterface using aspectrum analyzer.4. Plot the RSSI levels on a floor plan of the building and check against the pre-installationRSSI levels to determine the overall and average RSSI improvement attributed to theDigivance ICS. Check the entire Digivance coverage area.5. Verify call processing and voice quality within the coverage areas. Initiate and receivemultiple long and short duration calls. Document the performance and address any issuesas calls are processed within the entire coverage area. Assuming a properly functioningserver RF link and BTS and a properly designed and optimized ICS system, there shouldbe no clicks, mutes, clipping, or crackles within the coverage area. In awireless officeapplication, hand off will not occur.6. If the DHU interfaces with alocal BTS (microcell), verify the handoff function byplacing acall and confirming handoffs between the Digivance/microcell coverage areaand the outdoor macrocell coverage area (macro system) and vice versa. The handoffshould take place without any noticeable call quality or performance issues.7. If the DHU interfaces with aremote BTS through a donor antenna, verify call quality byplacing acall and then walking between the Digivance coverage area and an areareceiving good coverage directly from the cell site base station. There should be nonoticeable difference in call quality.8. Following service provider guidelines, test the 411 and 911 links to verify the routing ofemergency and special services calls on local BTS configurations.9. Verify that the alarm reporting system functions properly by turning the DHU off. Thisshould generate amajor and minor alarm and operate both the major and minor alarmcontacts. Check for alarm confirmation from the service provider’s local switch andNetwork Operations Center (NOC). Note that this tests only the external alarm systemand does not verify operation of the Digivance alarm reporting system.
ADCP-75-136 • Issue 1 • November 2002 Page 43 ©2002, ADC Telecommunications, Inc.6 SYSTEM MAINTENANCE PROCEDURES This section explains the alarm reporting system, provides amethod for isolating andtroubleshooting faults, and provides procedures for replacing the modular transceivers and theDHU or DEU cooling fans.The Digivance ICS requires no regular maintenance to insure continuous and satisfactoryoperation. Maintenance, as it applies to the Digivance ICS, primarily involves diagnosing andcorrecting service problems as they occur. When an alarm is reported, it will be necessary tofollow asystematic troubleshooting procedure to locate the problem. Once the source of theproblem is isolated, the appropriate corrective action can be taken to restore service. The onlyunit components that can be replaced are the cooling fans that mount in the DHU and DEUand the modular optical transceivers. The failure of any other component within aunit willrequire replacement of that unit.6.1 Tools and Materials The following tools and materials are required in order to complete the procedures in thissection:• ESD wrist strap• IR filtering safety glasses• Optical loopback device (such as Stratos Lightwave LC5 series) and LC duplex adapter• Optical power meter• Magnification device for inspecting LC connectors• Laser light source• Multimeter• Cell phone• RJ-45 circuit access tool (such as the Harris 8-wire Banjo Adapter)• Medium and small size flat-bladed screwdrivers• TORX screwdriver (T10)6.2 Fault Detection and Alarm Reporting Detection of a fault by the Digivance ICS will generate an external alarm response. LEDindicators are provided on the front panel of the various units to indicate when afault isdetected. In addition to LED indicators, the DHU also provides normally open (NO) andnormally closed (NC) dry alarm contacts for reporting minor and major alarms to an externalalarm system. Aminor alarm is defined as ahigh temperature condition. Amajor alarm isdefined as any fault condition except high temperature.When the DHU alarm contacts are connected to an external alarm system, detection of a faultwill generate an alarm at the Network Operations Center (NOC). However, various types offaults may not generate an alarm response. In this case, the first indication of a problem willprobably be from cell phone users reporting aloss of service or poor service. Whenever aproblem is reported, whether by a external alarm system or by a call from auser, refer toSubsection 6.3 to isolate and correct the fault.
ADCP-75-136 • Issue 1 • November 2002 Page 44 ©2002, ADC Telecommunications, Inc.6.3 Fault Isolation and Troubleshooting Fault isolation and troubleshooting guidelines are provided in Tables 11, 12, 13, and 14. When analarm is reported, determine the type of alarm generated (minor or major) and then check the LEDindicators on the DHU and note any that are red, yellow, or off.If any of the Port 1–6 OK/NOKLED indicators on the DHU are red or yellow, also check the LED indicators on the connectedDEU’s and/or DRU’s and note if any are red or yellow. Start the troubleshooting process at theDHU and then work toward the unit where the alarm originated. The troubleshooting tables areorganized according to unit type. Locate the problem in the appropriate table, check out thesuggested possible causes, and take corrective action as required.Figure 24 shows two basic ICS system configurations. The troubleshooting tables list possiblecauses for various problems. If the cause of aparticular problem is specific to either of the twosystem configurations shown in Figure 24, the type of system configuration (1 or 2) will bereferenced in the table.17962-AFWDREVDRUFWDREVDRUFWDREVDIGITAL EXPANSION UNITDIGITAL HOST UNITDIGITAL HOST UNIT(2)(1)Figure 24. ICS System Basic Configurations Table 11. DHU Fault Isolation and Troubleshooting Guidelines Alarm Type LED LED COLOR Minor UNIT YellowProblem : The DHU is overheating. POSSIBLE CAUSE CORRECTIVE ACTION/COMMENTS 1. Air intake or exhaust openings to DHUchassis blocked.2. Ambient temperature > 50º C/122º F.3. Faulty fan.1. Remove cause of air-flow blockage.2. Reduce ambient temperature.3. Replace fan (see Subsection 6.5).Alarm Type LED LED COLOR Major UNIT RedProblem : The DHU detects an internal circuitry fault. POSSIBLE CAUSE CORRECTIVE ACTION/COMMENTS 1. Faulty DHU. 1. Replace DHU.(Continued)
ADCP-75-136 • Issue 1 • November 2002 Page 45 ©2002, ADC Telecommunications, Inc.Table 11. DHU Fault Isolation and Troubleshooting Guidelines (Continued) Alarm Type LED LED COLOR Major OVERDRIVE RedProblem: Forward path RF input level too high. POSSIBLE CAUSE CORRECTIVE ACTION/COMMENTS 1. Incorrect attenuation in forward path RFcoaxial link. 1. Adjust attenuation at interface device.Alarm Type LED LED COLOR Minor OK/NOK YellowProblem: The DHU is receiving a minor alarm signal from the DEU. POSSIBLE CAUSE CORRECTIVE ACTION/COMMENTS 1. The connected DEU is overheating (2). 1. Check DEU UNIT indicator and then refer to theappropriate troubleshooting section for procedures.Alarm Type LED LED COLOR Major OK/NOK Blinking RedProblem: The DHU is not receiving an optical signal from the DRU or DEU. POSSIBLE CAUSE CORRECTIVE ACTION/COMMENTS 1. Forward and reverse path optical fibersreversed between DHU and DRU (1); orbetween DHU and DEU (2).2. Faulty reverse path optical fiber between DHUand DRU (1).3. Faulty optical receive port at DHU or faultyoptical transmit port at DRU (1).4. Faulty forward or reverse path optical fiberbetween DHU and DEU (2).1. Check fiber connections for correct polarity andreverse connectors at either unit if mismatched.2. Clean optical connector and then test optical fiber.Repair or replace if faulty (see Subsection 6.4.2).3. Make sure transceiver is fully plugged in and thentest optical port. Replace optical transceiver ifport is faulty (see Subsection 6.4.1).4. Clean optical connectors and then test opticalfibers. Repair or replace if faulty (see Subsection6.4.2).Alarm Type LED LED COLOR Major OK/NOK RedProblem: The DHU is receiving a major alarm signal from the DRU. POSSIBLE CAUSE CORRECTIVE ACTION/COMMENTS 1. Faulty forward path optical fiber betweenDHU and DRU (1).2. Faulty optical transmit port at DHU or faultyoptical receive port at DRU (1).3. The DRU is faulty (1 and 2).4. Faulty forward or reverse path optical fiberbetween the DEU and DRU (2).1. Clean optical connector and then test optical fiber.Repair or replace if faulty (see Subsection 6.4.2).2. Make sure transceiver is fully plugged in and thentest optical port. Replace optical transceiver ifport is faulty (see Subsection 6.4.1).3. Check DEU UNIT indicator or DRU STATUSindicator and then refer to appropriate trouble-shooting section for procedures.4. Check the status of the OK/NOK LED on theDEU and then Refer to Table 12.
ADCP-75-136 • Issue 1 • November 2002 Page 46 ©2002, ADC Telecommunications, Inc.Table 12. DEU Fault Isolation and Troubleshooting Guidelines Alarm Type LED LED COLOR Minor UNIT YellowProblem : The DEU is overheating. POSSIBLE CAUSE CORRECTIVE ACTION/COMMENTS 1. Air intake or exhaust openings to DEUchassis blocked.2. Ambient temperature > 50º C/122º F.3. Faulty fan.1. Remove cause of air-flow blockage.2. Reduce ambient temperature.3. Replace fan (see Subsection 6.5).Alarm Type LED LED COLOR Major UNIT RedProblem : The DEU detects an internal circuitry fault. POSSIBLE CAUSE CORRECTIVE ACTION/COMMENTS 1. Faulty DEU. 1. Replace DEU.Alarm Type LED LED COLOR Major HOST PORT Blinking RedProblem: The DEU is not receiving an optical signal from the DHU. POSSIBLE CAUSE CORRECTIVE ACTION/COMMENTS 1. Faulty forward path optical fiber between DEUand DHU (2).2. Faulty optical receive port at DEU or faultyoptical transmit port at DHU (2).1. Clean optical connector and then test optical fiber.Repair or replace if faulty (see Subsection 6.4.2).2. Make sure transceiver is fully plugged it and thentest optical port. Replace optical transceiver ifport is faulty (see Subsection 6.4.1).Alarm Type LED LED COLOR Minor OK/NOK YellowProblem: The DEU is receiving a minor alarm signal from a connected DEU. POSSIBLE CAUSE CORRECTIVE ACTION/COMMENTS 1. The connected DEU is overheating. 1. Check DEU UNIT indicator and then refer to theappropriate troubleshooting section for procedures.Alarm Type LED LED COLOR Major OK/NOK Blinking RedProblem: The DEU is not receiving an optical signal from the DRU. POSSIBLE CAUSE CORRECTIVE ACTION/COMMENTS 1. Forward and reverse path optical fibersreversed between DEU and DRU.2. Faulty reverse path optical fiber between DEUand DRU.3. Faulty optical receive port at DEU or faultyoptical transmit port at DRU.1. Check fiber connections for correct polarity andreverse connectors at either unit if mismatched.2. Clean optical connector and then test optical fiber.Repair or replace if faulty (see Subsection 6.4.2).3. Make sure transceiver is fully plugged in and thentest optical port. Replace optical transceiver ifport is faulty (see Subsection 6.4.1).(Continued)
ADCP-75-136 • Issue 1 • November 2002 Page 47 ©2002, ADC Telecommunications, Inc.Table 12. DEU Fault Isolation and Troubleshooting Guidelines (Continued) Alarm Type LED LED COLOR Major OK/NOK RedProblem: The DEU is receiving a major alarm signal from the connected DRU. POSSIBLE CAUSE CORRECTIVE ACTION/COMMENTS 1. Faulty forward path optical fiber between DEUand DRU.2. Faulty optical transmit port at DEU or faultyoptical receive port at DRU.3. The connected DRU is faulty.1. Clean optical connector and then test optical fiber.Repair or replace if faulty (see Subsection 6.4.2).2. Make sure transceiver is fully plugged in and thentest optical port. Replace optical transceiver ifport is faulty (see Subsection 6.4.1).3. Check DRU STATUS indicator and then referto appropriate troubleshooting section forprocedures.Table 13. DRU Fault Isolation and Troubleshooting Guidelines Alarm Type LED LED COLOR Major STATUS OffProblem : The DRU is not powered. POSSIBLE CAUSE CORRECTIVE ACTION/COMMENTS 1. DC power cable open.2. No power or insufficient power output fromac/dc power converter, DHU (1), or DEU (2).3. Faulty DRU.1. Test cable for continuity and repair or replace iffaulty.2. Check DC voltage level at the DRU (see Subsection6.4.3). Replace converter, DHU, or DEU (whicheverapplies) if voltage is not within 34 to 48 Vdc.3. Replace DRU.Alarm Type LED LED COLOR Major STATUS Blinking RedProblem : The DRU is not receiving an optical signal from the DHU or DEU; or the DHU or DEU is not receiving an optical signal from the DRU. POSSIBLE CAUSE CORRECTIVE ACTION/COMMENTS 1. Faulty forward or reverse path optical fiberbetween DHU and DRU (1), DEU andDRU (2), or DEU and DHU (2).2. Faulty optical transmit or receive port at theDHU (1) or DEU (2); or faulty opticaltransmit or receive port at DRU (1 and 2).1. Clean optical connector and then test optical fiber.Repair or replace if faulty (see Subsection 6.4.2).2. Make sure transceiver is fully plugged it and thentest optical port. Replace optical transceiver ifport is faulty (see Subsection 6.4.1).Alarm Type LED LED COLOR Major STATUS RedProblem: The DRU detects an internal circuitry fault. POSSIBLE CAUSE CORRECTIVE ACTION/COMMENTS 1. Faulty DRU. 1. Replace DRU.
ADCP-75-136 • Issue 1 • November 2002 Page 48 ©2002, ADC Telecommunications, Inc.Table 14. System Fault Isolation and Troubleshooting Guidelines Alarm Type LED LED COLOR None All NormalProblem: Loss of phone service from one DRU. Service normal at all other DRU’s. POSSIBLE CAUSE CORRECTIVE ACTION/COMMENTS 1. DRU antenna cable disconnected.2. DRU antenna obstructed or misdirected.3. DRU antenna faulty.4. DRU faulty.1. Re-connect DRU antenna cable to DRU.2. Remove antenna obstruction or re-orient antenna.3. Replace antenna.4. Replace DRU.Alarm Type LED LED COLOR None All NormalProblem: Loss of phone service from all DRU’s. POSSIBLE CAUSE CORRECTIVE ACTION/COMMENTS 1. Faulty coaxial connection between DHUand the interface device.2. Faulty coaxial connection between interfacedevice and the BTS or donor antenna.3. Faulty interface equipment.4. Faulty DHU5. Fault with cellular network or equipment.1. Check forward path signals at the DHU. Checkreverse path signals at the interface device.2. Check forward path signals at the interfaceequipment. Check reverse path signals at the BTS orantenna.3. Adjust or replace interface equipment.4. Replace DHU.5. Contact cell service provider and verify thatcellular network and equipment is operational.Alarm Type LED LED COLOR None All NormalProblem: Calls may be originated and terminated but service is noisy. POSSIBLE CAUSE CORRECTIVE ACTION/COMMENTS 1. Some electrical device in the immediatevicinity is creating interference. 1. Try turning off each device that may be causinginterference and see if problem corrects itself.Alarm Type LED LED COLOR None All NormalProblem: Sudden high rate of blocked calls (delay dial tone). POSSIBLE CAUSE CORRECTIVE ACTION/COMMENTS 1. Too many users for the number of channelsavailable.2. Faulty DHU, DEU, or DRU.1. Wait afew minutes and try dialing again. Upgradeservice if additional channels are required.2. Replace defective unit.
ADCP-75-136 • Issue 1 • November 2002 Page 49 ©2002, ADC Telecommunications, Inc.6.4 Test Procedures 6.4.1 Optical Loopback Test Procedure Dirty optical connectors, afaulty optical transceiver, abreak in an optical fiber, or a fault in anoptical connector will interrupt communications between fiber-linked components. Use thefollowing procedure to determine if afault exists with an optical port or with an optical fiber: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. Donot look directly into the optical transceiver of any digital unit or exposure to laser radiationmay result. An optical power meter should be used to verify active fibers. Aprotective cap orhood MUST be immediately placed over any radiating transceiver or optical fiber connectorto avoid the potential of dangerous amounts of radiation exposure. This practice also preventsdirt particles from entering the transceiver or connector.1. Put on the IR filtering safety glasses.2. At the DHU or supporting DEU, place the PORT ON/OFF switch for the fiber port orfiber to be tested in the OFF position (press O).3. Disconnect the optical connectors for the fiber port to be tested and place adust cap overeach connector.4. Plug aloopback into the optical port to be tested as shown in Figure 25.17277-AOPTICAL LOOPBACKCONNECTION DETAILPORT 1 OPTICALTRANSCEIVEROPTICALLOOPBACKFigure 25. DHU/DEU Loopback Test 5. At the DHU or supporting DEU, place the PORT ON/OFF switch in the ON position(press I).
ADCP-75-136 • Issue 1 • November 2002 Page 50 ©2002, ADC Telecommunications, Inc.6. The PORT OK/NOK LED will turn either blinking red or green. If the LED turnsblinking red, the optical port is faulty. Replace the optical transceiver and then rechecksystem operation. If the LED turns green, the optical port is good. Proceed to step 7tocontinue the test procedure.7. Place the PORT ON/OFF switch in the OFF position (press O).8. Disconnect the loopback from the DHU or supporting DEU.9. Clean and then reconnect the optical fiber connectors to the DHU or DEU optical port.10. Disconnect the optical connectors at the DRU optical port or remote DEU host port (farend of fiber).11. Clean the optical fiber connectors and then using an LC optical adapter, connect theloopback to the connectors as shown in Figure 26.16768-BOPTICALADAPTEROPTICALLOOPBACKOPTICALCONNECTORNOTE: iF THE DISTANCE BETWEEN THE DHU/DEU AND THEDRU EXCEEDS THE DISTANCE SHOWN BELOW, THE REMOTE LOOPBACK TEST WILL NOT WORK.62.5 MICRON MULTI-MODE FIBER - 250 METERS50 MICRON MULTI-MODE FIBER - 375 METERS9 MICRON SINGLE-MODE FIBER - 5 KILOMETERSFigure 26. Optical Fiber Loopback Test 12. Insert adust plug into the DRU optical port or remote DEU host port.13. At the DHU or supporting DEU, place the PORT ON/OFF switch in the ON position(press I).14. The PORT OK/NOK LED will turn either blinking red or green. If the LED turnsblinking red, one of the optical fibers is faulty. Refer to Subsection 6.4.2 to isolate whichfiber is at fault. If the LED turns green, the optical fibers are good. Proceed to step 14 tofinish the test procedure.15. At the DHU or supporting DEU, place the PORT ON/OFF switch in the OFF position(press O).16. Disconnect the loopback and the optical adapters from the optical fiber connectors.17. Place adust cap over the connector for each optical fiber18. Remove the dust plug from the DRU optical port or remote DEU host port.19. Plug the loopback into the DRU optical port or DEU host port as shown in Figure 27.20. If testing aDRU that is powered by the DHU or by a supporting DEU, place the PORTON/OFF switch in the ON position (press I).
ADCP-75-136 • Issue 1 • November 2002 Page 51 ©2002, ADC Telecommunications, Inc.17282-AOPTICAL LOOPBACKCONNECTION DETAILOPTICALTRANSCEIVEROPTICALLOOPBACKFigure 27. DRU Loopback Test 21. The DRU STATUS LED or DEU HOST LED will turn either blinking red or green. Ifthe LED turns blinking red, the optical port is faulty and the optical transceiver must bereplaced. If the LED turns green, the optical port is good.22. At the DHU or supporting DEU, place the PORT ON/OFF switch in the OFF position(press O).23. Remove the loopback from the DRU optical port or remote DEU host port.24. Clean the optical fiber connectors and then reconnect the optical fibers to the DRUoptical port or remote DEU host port.25. At the DHU or supporting DEU, place the PORT ON/OFF switch in the ON position(press I).26. Verify that the PORT OK/NOK LED turns green.6.4.2 Optical Loss Test Procedure Abreak in an optical fiber or a fault with the optical connector will interrupt communicationsbetween linked components. Use the following procedure to isolate aproblem with an opticalfiber or optical connector: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. Donot look directly into the optical transceiver of any digital unit or exposure to laser radiationmay result. An optical power meter should be used to verify active fibers. Aprotective cap orhood MUST be immediately placed over any radiating transceiver or optical fiber connectorto avoid the potential of dangerous amounts of radiation exposure. This practice also preventsdirt particles from entering the transceiver or connector.1. Put on the IR filtering safety glasses.2. At the DHU or supporting DEU, place the PORT ON/OFF switch for the optical fiber tobe tested in the OFF position (press O)if not already off.
ADCP-75-136 • Issue 1 • November 2002 Page 52 ©2002, ADC Telecommunications, Inc.3. Disconnect the optical connectors at the DHU or supporting DEU and at thecorresponding DRU or remote DEU.4. Inspect the optical connectors. Verify that each connector is clean and that no scratchesor imperfections are visible on the fiber end. Clean and polish the optical connector ifnecessary.5. Connect a laser light source to one end of the first optical fiber and an optical powermeter to the other end.6. Verify that the power loss is within specifications (8 dB loss) for the length of the fiberinstalled. If the power loss is not within specifications, repair or replace the optical fiberand/or connector per local practice.7. Repeat steps 5and 6for the second optical fiber.8. Reconnect the optical connectors at the DHU or supporting DEU and the correspondingDRU or remote DEU.9. At the DHU or supporting DEU, place the PORT ON/OFF switch for the fiber that wastested in the ON position (press I).6.4.3 DC Power Test Procedure The DRU is powered by 34–48 Vdc power which is supplied through the RJ-45 connector.Power to the DRU may be supplied by the DHU, DEU, or by a 120 Vac to 48 Vdc powerconverter (available separately as an accessory item) plugged into a properly grounded 120Vac outlet. Use the following procedure to test the DC power cable:1. Disconnect the DC power cable from the DRU.2. Connect the RJ-45 circuit access tool to the DRU as shown in Figure 28.POWERPORTPOWERCONNECTORRJ-45 CIRCUIT ACCESS TOOL17284-AFigure 28. Connect RJ-45 Circuit Access Tool

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