ADC DIS190AB Users Manual

ADCP-75-132 • Issue 2C • August 2006

6 SYSTEM MAINTENANCE PROCEDURES

This section explains the alarm reporting system, provides a method for isolating and troubleshooting faults, and provides procedures for replacing the modular transceivers and the DHU or DEU cooling fans.

The Digivance ICS requires no regular maintenance to insure continuous and satisfactory operation. Maintenance, as it applies to the Digivance ICS, primarily involves diagnosing and correcting service problems as they occur. When an alarm is reported, it will be necessary to follow a systematic troubleshooting procedure to locate the problem. Once the source of the problem is isolated, the appropriate corrective action can be taken to restore service. The only unit components that can be replaced are the cooling fans that mount in the DHU and DEU and the modular optical transceivers. The failure of any other component within a unit will require replacement of that unit.

6.1 Tools and Materials

The following tools and materials are required in order to complete the procedures in this section:

• 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. LED indicators are provided on the front panel of the various units to indicate when a fault is detected. In addition to LED indicators, the DHU also provides normally open (NO) and normally closed (NC) dry alarm contacts for reporting minor and major alarms to an external alarm system. A minor alarm is defined as a high temperature condition. A major alarm is defined as any fault condition except high temperature.

When the DHU alarm contacts are connected to an external alarm system, detection of a fault will generate an alarm at the Network Operations Center (NOC). However, various types of faults may not generate an alarm response. In this case, the first indication of a problem will probably be from cell phone users reporting a loss of service or poor service. Whenever a problem is reported, whether by a external alarm system or by a call from a user, refer to Subsection 6.3 to isolate and correct the fault.

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6.3 Fault Isolation and Troubleshooting

Fault isolation and troubleshooting guidelines are provided in Tables 11, 12, 13, and 14. When an alarm is reported, determine the type of alarm generated (minor or major) and then check the LED indicators on the DHU and note any that are red, yellow, or off. If any of the Port 1–6 OK/NOK LED indicators on the DHU are red or yellow, also check the LED indicators on the connected DEU’s and/or DRU’s and note if any are red or yellow. Start the troubleshooting process at the DHU and then work toward the unit where the alarm originated. The troubleshooting tables are organized according to unit type. Locate the problem in the appropriate table, check out the suggested possible causes, and take corrective action as required.

Figure 25 shows two basic ICS system configurations. The troubleshooting tables list possible causes for various problems. If the cause of a particular problem is specific to either of the two system configurations shown in Figure 25, the type of system configuration (1 or 2) will be referenced in the table.

ADCP-75-132 • Issue 2C • August 2006

DIGITAL HOST UNIT

REV

DRU

(1)

FWD

REV

DIGITAL EXPANSION UNITDIGITAL HOST UNIT

(2)

FWD

Figure 25. ICS System Basic Configurations

Table 11. DHU Fault Isolation and Troubleshooting Guidelines

Alarm Type LED LED COLOR

Minor UNIT Yellow

Problem : The DHU is overheating.

POSSIBLE CAUSE CORRECTIVE ACTION/COMMENTS

1. Air intake or exhaust openings to DHU chassis blocked.

2. Ambient temperature > 50º C/122º F.

3. Faulty fan.

Alarm Type LED LED COLOR

Major UNIT Red

Problem : The DHU detects an internal circuitry fault.

POSSIBLE CAUSE CORRECTIVE ACTION/COMMENTS

1. Faulty DHU. 1. Replace DHU.

1. Remove cause of air-flow blockage.

2. Reduce ambient temperature.

3. Replace fan (see Subsection 6.5).

REV

FWD

DRU

17962-A

(Continued)

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Table 11. DHU Fault Isolation and Troubleshooting Guidelines (Continued)

Alarm Type LED LED COLOR

Major OVERDRIVE Red

Problem: Forward path RF input level too high.

POSSIBLE CAUSE CORRECTIVE ACTION/COMMENTS

1. Incorrect attenuation in forward path RF coaxial link.

Alarm Type LED LED COLOR

Minor OK/NOK Yellow

Problem: 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 the

Alarm Type LED LED COLOR

Major OK/NOK Blinking Red

Problem: The DHU is not receiving an optical signal from the DRU or DEU.

POSSIBLE CAUSE CORRECTIVE ACTION/COMMENTS

1. Forward and reverse path optical fibers reversed between DHU and DRU (1); or between DHU and DEU (2).

2. Faulty reverse path optical fiber between DHU and DRU (1).

3. Faulty optical receive port at DHU or faulty optical transmit port at DRU (1).

4. Faulty forward or reverse path optical fiber between DHU and DEU (2).

Alarm Type LED LED COLOR

Major OK/NOK Red

Problem: The DHU is receiving a major alarm signal from the DRU.

POSSIBLE CAUSE CORRECTIVE ACTION/COMMENTS

1. Faulty forward path optical fiber between DHU and DRU (1).

2. Faulty optical transmit port at DHU or faulty optical receive port at DRU (1).

3. The DRU is faulty (1 and 2).

4. Faulty forward or reverse path optical fiber between the DEU and DRU (2).

1. Adjust attenuation at RIU or HPCP.

appropriate troubleshooting section for procedures.

1. Check fiber connections for correct polarity and reverse 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 then test optical port. Replace optical transceiver if port is faulty (see Subsection 6.4.1).

4. Clean optical connectors and then test optical fibers. Repair or replace if faulty (see Subsection 6.4.2).

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 then test optical port. Replace optical transceiver if port is faulty (see Subsection 6.4.1).

3. Check DEU UNIT indicator or DRU STATUS indicator and then refer to appropriate trouble shooting section for procedures.

4. Check the status of the OK/NOK LED on the DEU and then Refer to Table 12.

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Table 12. DEU Fault Isolation and Troubleshooting Guidelines

Alarm Type LED LED COLOR

Minor UNIT Yellow

Problem : The DEU is overheating.

POSSIBLE CAUSE CORRECTIVE ACTION/COMMENTS

1. Air intake or exhaust openings to DEU chassis blocked.

2. Ambient temperature > 50º C/122º F.

3. Faulty fan.

Alarm Type LED LED COLOR

1. Remove cause of air-flow blockage.

2. Reduce ambient temperature.

3. Replace fan (see Subsection 6.5).

Major UNIT Red

Problem : 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 Red

Problem: The DEU is not receiving an optical signal from the DHU.

POSSIBLE CAUSE CORRECTIVE ACTION/COMMENTS

1. Faulty forward path optical fiber between DEU and DHU (2).

2. Faulty optical receive port at DEU or faulty optical 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 then test optical port. Replace optical transceiver if port is faulty (see Subsection 6.4.1).

Alarm Type LED LED COLOR

Minor OK/NOK Yellow

Problem: 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 the appropriate troubleshooting section for procedures.

Alarm Type LED LED COLOR

Major OK/NOK Blinking Red

Problem: The DEU is not receiving an optical signal from the DRU.

POSSIBLE CAUSE CORRECTIVE ACTION/COMMENTS

1. Forward and reverse path optical fibers

reversed between DEU and DRU.

2. Faulty reverse path optical fiber between DEU

and DRU.

3. Faulty optical receive port at DEU or faulty

optical transmit port at DRU.

1. Check fiber connections for correct polarity and reverse 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 then test optical port. Replace optical transceiver if port is faulty (see Subsection 6.4.1).

(Continued)

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ADCP-75-132 • Issue 2C • August 2006

Table 12. DEU Fault Isolation and Troubleshooting Guidelines (Continued)

Alarm Type LED LED COLOR

Major OK/NOK Red

Problem: The DEU is receiving a major alarm signal from the connected DRU.

POSSIBLE CAUSE CORRECTIVE ACTION/COMMENTS

1. Faulty forward path optical fiber between DEU and DRU.

2. Faulty optical transmit port at DEU or faulty optical receive port at DRU.

3. The connected DRU is faulty.

Alarm Type LED LED COLOR

Major STATUS Off

Problem : The DRU is not powered.

POSSIBLE CAUSE CORRECTIVE ACTION/COMMENTS

1. DC power cable open.

2. No power or insufficient power output from AC/DC power converter, DHU (1), or DEU (2).

3. Faulty DRU.

Alarm Type LED LED COLOR

Major STATUS Blinking Red

Problem : 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 fiber between DHU and DRU (1), DEU and DRU (2), or DEU and DHU (2).

2. Faulty optical transmit or receive port at the DHU (1) or DEU (2); or faulty optical transmit or receive port at DRU (1 and 2).

Alarm Type LED LED COLOR

Major STATUS Red

Problem: The DRU detects an internal circuitry fault.

POSSIBLE CAUSE CORRECTIVE ACTION/COMMENTS

1. Faulty DRU. 1. Replace DRU.

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 then test optical port. Replace optical transceiver if port is faulty (see Subsection 6.4.1).

3. Check DRU STATUS indicator and then refer to appropriate troubleshooting section for procedures.

Table 13. DRU Fault Isolation and Troubleshooting Guidelines

1. Test cable for continuity and repair or replace if faulty.

2. Check DC voltage level at the DRU (see Subsection

6.4.3). Replace converter, DHU, or DEU (whichever applies) if voltage is not within 34 to 48 VDC.

3. Replace DRU.

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 then test optical port. Replace optical transceiver if port is faulty (see Subsection 6.4.1).

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Table 14. System Fault Isolation and Troubleshooting Guidelines

Alarm Type LED LED COLOR

None All Normal

Problem: One or more of the DRU’s does not function following initial turn-up

POSSIBLE CAUSE CORRECTIVE ACTION/COMMENTS

1. The DHU and DRU(s) frequency switches

are set to different bands.

Alarm Type LED LED COLOR

1. Reset DHU and DRU(s) frequency switches to the same band.

None All Normal

Problem: 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.

Alarm Type LED LED COLOR

1. Re-connect DRU antenna cable to DRU.

2. Remove antenna obstruction or re-orient antenna.

3. Replace antenna.

4. Replace DRU.

None All Normal

Problem: Loss of phone service from all DRU’s.

POSSIBLE CAUSE CORRECTIVE ACTION/COMMENTS

1. Local Interface: Faulty forward path coaxial

connections between the DHU, HPCP and BTS. Faulty reverse path coaxial connec tions between the DHU and BTS.

2. Remote Interface: Faulty forward or reverse

path coaxial connections between the DHU and the RIU. Faulty coaxial connections between the RIU and donor antenna.

3. Faulty HPCP or RIU.

4. Faulty DHU

5. Fault with cellular network or equipment.

1. Check forward path signals at the HPCP and the DHU. Check reverse path signals at the BTS.

2. Check forward and reverse path signals at the DHU, RIU, and donor antenna.

3. Adjust or replace HPCP or RIU.

4. Replace DHU.

5. Contact cell service provider and verify that cellular network and equipment is operational.

Alarm Type LED LED COLOR

None All Normal

Problem: Calls may be originated and terminated but service is noisy.

POSSIBLE CAUSE CORRECTIVE ACTION/COMMENTS

1. Some electrical device in the immediate

vicinity is creating interference.

Alarm Type LED LED COLOR

1. Try turning off each device that may be causing interference and see if problem corrects itself.

None All Normal

Problem: Sudden high rate of blocked calls (delay dial tone).

POSSIBLE CAUSE CORRECTIVE ACTION/COMMENTS

1. Too many users for the number of channels

available.

2. Faulty DHU, DEU, or DRU.

1. Wait a few minutes and try dialing again. Upgrade service if additional channels are required.

2. Replace defective unit.

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6.4 Test Procedures

6.4.1 Optical Loopback Test Procedure

Dirty optical connectors, a faulty optical transceiver, a break in an optical fiber, or a fault in an optical connector will interrupt communications between fiber-linked components. Use the following procedure to determine if a fault exists with an optical port or with an optical fiber:

Danger: This equipment uses a Class 1 Laser according to FDA/CDRH rules. Laser

radiation can seriously damage the retina of the eye. Do not look into the ends of any optical fiber. Do not look directly into the optical transceiver of any digital unit or exposure to laser radiation may result. An optical power meter should be used to verify active fibers. A protective cap or hood MUST be immediately placed over any radiating transceiver or optical fiber connector to avoid the potential of dangerous amounts of radiation exposure. This practice also prevents dirt 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 or

fiber to be tested in the OFF position (press O).

3. Disconnect the optical connectors for the fiber port to be tested and place a dust cap over each connector.

4. Plug a loopback into the optical port to be tested as shown in Figure 26.

OPTICAL LOOPBACK

CONNECTION DETAIL

5. At the DHU or supporting DEU, place the PORT ON/OFF switch in the ON position (press I).

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PORT 1

OPTICAL

TRANSCEIVER

OPTICAL

LOOPBACK

Figure 26. DHU/DEU Loopback Test

17277-A

ADCP-75-132 • Issue 2C • August 2006

6. The PORT OK/NOK LED will turn either blinking red or green. If the LED turns blinking red, the optical port is faulty. Replace the optical transceiver and then recheck system operation. If the LED turns green, the optical port is good. Proceed to step 7 to continue 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 (far end of fiber).

11. Clean the optical fiber connectors and then using an LC optical adapter, connect the loopback to the connectors as shown in Figure 27.

NOTE: iF THE DISTANCE BETWEEN THE DHU/DEU AND THE DRU EXCEEDS THE DISTANCE SHOWN BELOW, THE REMOTE LOOPBACK TEST WILL NOT WORK.

62.5 MICRON MULTI-MODE FIBER - 250 METERS 50 MICRON MULTI-MODE FIBER - 375 METERS 9 MICRON SINGLE-MODE FIBER - 5 KILOMETERS

OPTICAL

LOOPBACK

16768-B

OPTICAL

ADAPTER

OPTICAL

CONNECTOR

Figure 27. Optical Fiber Loopback Test

12. Insert a dust 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 turns blinking red, one of the optical fibers is faulty. Refer to Subsection 6.4.2 to isolate which fiber is at fault. If the LED turns green, the optical fibers are good. Proceed to step 14 to finish 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 a dust cap over the connector for each optical fiber

18. 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 28.

20. If testing a DRU that is powered by the DHU or by a supporting DEU, place the PORT ON/OFF switch in the ON position (press I).

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21. The DRU STATUS LED or DEU HOST LED will turn either blinking red or green. If the LED turns blinking red, the optical port is faulty and the optical transceiver must be replaced. If the LED turns green, the optical port is good.

OPTICAL LOOPBACK

CONNECTION DETAIL

OPTICAL

LOOPBACK

TRANSCEIVER

Figure 28. DRU Loopback Test

17282-A

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 DRU optical 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

A break in an optical fiber or a fault with the optical connector will interrupt communications between linked components. Use the following procedure to isolate a problem with an optical fiber or optical connector:

Danger: This equipment uses a Class 1 Laser according to FDA/CDRH rules. Laser

radiation can seriously damage the retina of the eye. Do not look into the ends of any optical fiber. Do not look directly into the optical transceiver of any digital unit or exposure to laser radiation may result. An optical power meter should be used to verify active fibers. A protective cap or hood MUST be immediately placed over any radiating transceiver or optical fiber connector to avoid the potential of dangerous amounts of radiation exposure. This practice also prevents dirt 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 to be tested in the OFF position (press O) if not already off.

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3. Disconnect the optical connectors at the DHU or supporting DEU and at the corresponding DRU or remote DEU.

4. Inspect the optical connectors. Verify that each connector is clean and that no scratches or imperfections are visible on the fiber end. Clean and polish the optical connector if necessary.

5. Connect a laser light source to one end of the first optical fiber and an optical power meter to the other end.

6. Verify that the power loss is within specifications (8 dB loss) for the length of the fiber installed. If the power loss is not within specifications, repair or replace the optical fiber and/or connector per local practice.

7. Repeat steps 5 and 6 for the second optical fiber.

8. Reconnect the optical connectors at the DHU or supporting DEU and the corresponding DRU or remote DEU.

9. At the DHU or supporting DEU, place the PORT ON/OFF switch for the fiber that was tested 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 power converter (available separately as an accessory item) plugged into a properly grounded 120 VAC 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 29.

POWER

PORT

17284-A

POWER

CONNECTOR

RJ-45 CIRCUIT ACCESS TOOL

Figure 29. Connect RJ-45 Circuit Access Tool

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ADCP-75-132 • Issue 2C • August 2006

3. Connect the DC power cable to the RJ-45 circuit access tool (see Figure 29).

4. Using a DC voltmeter, verify that the DC voltage level is between 34 and 48 VDC between any set of positive and negative (+/-) terminals at the RJ-45 circuit access tool as shown in Figure 30. Due to source current limiting at the DHU or DEU, low voltage can mean excess wire resistance, low source voltage, or excess remote current.

Warning: The DRU uses 48 VDC power. To avoid electric shock or burns, use extreme care

when working near exposed terminals or uninsulated cables. Be careful not to touch exposed terminals or to cause a short between terminals when checking voltage levels.

POSITIVE (+)

TEST POINTS

1, 3, 5, AND 7

Figure 30. RJ-45 Circuit Access Tool Pin/Wire Designations

5. Disconnect RJ-45 circuit access tool from the DRU.

6. Use the DC voltmeter to check for open pin connections by checking for voltage between the +/– pairs on the RJ-45 circuit access tool (see Figure 30).

7. Disconnect the DC power cable from the RJ-45 circuit access tool.

8. Re-connect DC power cable to the DRU.

6.5 DHU or DEU Fan Replacement Procedure

It is recommended that the fans (catalog # DGVI-100000FAN) be replaced every five years. Replacement of a fan requires that the DHU or DEU be turned off for a short period of time. This will drop all existing calls, cause a temporary loss of service, and generate a major alarm. Use the following procedure to replace the cooling fans within the DHU or the DEU:

1. Before touching the DHU or DEU or handling a fan, slip on an Electro-Static Discharge (ESD) wrist strap and connect the ground wire to an earth ground source. Wear the ESD wrist strap while completing each section of the fan installation procedure.

NEGATIVE (-) TEST POINTS

2, 4, 6, AND 8

16206-B

Warning: Electronic components can be damaged by static electrical discharge. To prevent

ESD damage, always wear an ESD wrist strap when working on the DHU or DEU and when handling electronic components.

2. Observe the fans (located on right side of enclosure) to determine which fan requires replacement. The faulty fan may be stopped, running at a reduced speed, or the fan bearing may be noisy.

Note: Because the Mean Time Between Failures (MBTF) is the same for both fans, it may be

more efficient to replace both fans at the same time.

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3. Notify the NOC or alarm monitoring system operator that the system is going offline.

4. Place the DHU or DEU AC power On/Off switch (see Figure 3 or Figure 7) in the OFF

position (press O).

5. Remove the six flat-head screws (requires TORX screwdriver with T15 bit) that secure the fan/grill assembly to the side of the enclosure as shown in Figure 31 and save for reuse.

16172-B

Figure 31. Fan/Grill Assembly Removal

6. Carefully withdraw the fan/grill assembly from the enclosure until the wiring harness is exposed and the connectors are accessible.

7. Lift the small latch on each wiring harness connector (see Figure 31) and carefully unplug each connector from the circuit board connector.

8. Remove the four plastic rivets that secure the faulty fan to the grill by pushing outward on rivet center post until the rivet can be withdrawn from the grill as shown in Figure 32.

9. Remove the faulty fan(s) from the grill and then locate the replacement fan(s).

10. Use the rivets removed in step 8 to secure the replacement fan to the grill. Orient the fan so the wiring harness is on the top and the arrow on the fan housing faces into the enclosure.

11. Connect the two wiring harness connectors to the circuit board connectors.

12. Secure the fan/grill assembly to the side of the enclosure (see Figure 31) using the six flat-head screws removed in step 5.

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13. Place the DHU or DEU AC power On/Off switch in the ON position (press I).

16173-B

Figure 32. Removing Fan From Grill

14. Verify that the fans run properly following power up.

15. Notify the NOC or alarm monitoring system operator that the system is going back online.

6.6 DHU or DEU Modular Optical Transceiver Replacement Procedure

The modular optical transceiver should be replaced when testing indicates that the transceiver has failed. Use the following procedure to replace an optical transceiver in a DHU or DEU:

Danger: This equipment uses a Class 1 Laser according to FDA/CDRH rules. Laser

radiation can seriously damage the retina of the eye. Do not look into the ends of any optical fiber. Do not look directly into the optical transceiver of any digital unit or exposure to laser radiation may result. An optical power meter should be used to verify active fibers. A protective cap or hood MUST be immediately placed over any radiating transceiver or optical fiber connector to avoid the potential of dangerous amounts of radiation exposure. This practice also prevents dirt particles from entering the transceiver or connector.

1. Put on the IR filtering safety glasses.

2. Slip on an Electro-Static Discharge (ESD) wrist strap and connect the ground wire to an earth ground source such as the grounding stud on the DHU or DEU front panel. Wear the ESD wrist strap while completing the optical transceiver replacement procedure.

Warning: Electronic components can be damaged by static electrical discharge. To prevent

ESD damage, always wear an ESD wrist strap when handling electronic components.

3. Place the PORT ON/OFF switch for the optical transceiver being replaced in the OFF position (press O).

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Note: The HOST PORT on the DEU does not have an On/Off switch and can only be

disabled by placing the DEU AC power On/Off switch in the OFF position (press O). Turning off the power to the DEU will create an alarm condition. If the DEU must be turned off, inform the NOC or alarm monitoring system operator that an alarm will be reported.

4. Disconnect the optical fiber connectors from the optical transceiver and place a dust cap over each connector.

5. Release the optical transceiver from the transceiver socket by pulling outward on the release lever (if type A) or release tab (if type B) as shown in Figure 33.

TYPE A

TRANSCEIVER

17283-A

RELEASE

LEVER

TRANSCEIVER COLOR CODE

BLUE = SINGLE-MODE (9 MICRON)

BLACK/ BEIGE = MULTI-MODE (50 OR 62.5 MICRON)

RELEASE TAB

TYPE B

TRANSCEIVER

Figure 33. DHU or DEU Optical Transceiver Removal

6. Remove the optical transceiver from the transceiver socket.

7. For replacement, select an optical transceiver that corresponds to the type of fiber (single- or multi-mode) used in the installation. The color of the transceiver corresponds to the transceiver fiber type (see Figure 33).

8. Remove the optical transceiver from the anti-static packaging and orient for installation as shown in Figure 34.

Note: Two types of optical transceivers, type A and type B, are available. Both types

provide the same functionality. On the type A optical transceiver, the release lever (see Figure 34) must be closed for installation.

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RELEASE

LEVER

TYPE A

TRANSCEIVER

RELEASE TAB

DETAIL DRAWING

OF TYPE A AND TYPE B

MODULAR OPTICAL

TRANSCEIVERS

9. Insert the optical transceiver into the socket until it locks into place.

10. Clean the optical fiber connectors and reconnect to the optical transceiver.

TX

RX

TYPE B

TRANSCEIVER

T X

R X

Figure 34. DHU or DEU Optical Transceiver Installation

17280-A

11. Place the PORT ON/OFF switch for the optical transceiver that was replaced in the ON

position (press I).

Note: If the DEU was turned off to replace the HOST PORT optical transceiver, place the

DEU AC power On/Off switch in the ON position (press I) and inform the NOC or alarm monitoring system operator that the alarm has been cleared.

12. Verify that the DHU or DEU optical port LED indicators shown normal optical port operation (refer to Table 7 or 8).

6.7 DRU Modular Optical Transceiver Replacement Procedure

The modular optical transceiver should be replaced when testing indicates that the transceiver has failed. Use the following procedure to replace an optical transceiver in a DRU:

Danger: This equipment uses a Class 1 Laser according to FDA/CDRH rules. Laser

radiation can seriously damage the retina of the eye. Do not look into the ends of any optical fiber. Do not look directly into the optical transceiver of any digital unit or exposure to laser radiation may result. An optical power meter should be used to verify active fibers. A protective cap or hood MUST be immediately placed over any radiating transceiver or optical fiber connector to avoid the potential of dangerous amounts of radiation exposure. This practice also prevents dirt particles from entering the transceiver or connector.

1. Put on the IR filtering safety glasses.

2. Slip on an Electro-Static Discharge (ESD) wrist strap and connect the ground wire to an earth ground source. Wear the ESD wrist strap while completing the optical transceiver replacement procedure.

Warning: Electronic components can be damaged by static electrical discharge. To prevent

ESD damage, always wear an ESD wrist strap when handling electronic components.

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3. Disconnect the DC power cable connector from the RJ-45 power jack on the DRU front panel.

Note: Disconnecting the power from the DRU will create an alarm condition. Inform the

NOC or alarm monitoring system operator that the alarm will be reported.

4. Disconnect the optical fiber connectors from the optical transceiver and place a dust cap over each connector.

5. Release the optical transceiver from the transceiver socket by pulling outward on the release lever (if type A) or release tab (if type B) as shown in Figure 35.

TYPE A

TRANSCEIVER

17285-A

TYPE B

TRANSCEIVER

RELEASE

LEVER

TRANSCEIVER COLOR CODE

BLUE = SINGLE-MODE (9 MICRON)

RELEASE TAB

BLACK/ BEIGE = MULTI-MODE (50 OR 62.5 MICRON)

Figure 35. DRU Optical Transceiver Removal

6. Remove the optical transceiver from the transceiver socket.

7. For replacement, select an optical transceiver that corresponds to the type of fiber (single- or multi-mode) used in the installation. The color of the transceiver corresponds to the fiber type (see Figure 35).

8. Remove the optical transceiver from the anti-static packaging and orient for installation as shown in Figure 36.

Note: Two types of optical transceivers, type A and type B, are available. Both types

provide the same functionality. On the type A optical transceiver, the release lever (see Figure 36) must be closed for installation.

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ADCP-75-132 • Issue 2C • August 2006

RELEASE

LEVER

TYPE A

TRANSCEIVER

DETAIL DRAWING

OF TYPE A AND TYPE B

MODULAR OPTICAL

TRANSCEIVERS

9. Insert the optical transceiver into the socket until it locks into place.

10. Clean the optical fiber connectors and reconnect to the optical transceiver.

TYPE B

TRANSCEIVER

RELEASE TAB

T

X

R

X

T X

R X

Figure 36. DRU Optical Transceiver Installation

17286-A

11. Reconnect the DC power cable plug to the RJ-45 jack on the DRU front panel and inform the NOC or alarm monitoring system operator that the alarm has been cleared.

12. Verify that the DRU LED indicator shows normal operation (refer to Table 9).

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7 GENERAL INFORMATION

7.1 Warranty/Software

The Product and Software warranty policy and warranty period for all ADC products is published in ADC’s Warranty/Software Handbook. Contact the Technical Assistance Center at 1-800-366-3891, extension 73476 (in U.S.A. or Canada) or 952-917-3476 (outside U.S.A. and Canada) for warranty or software information or for a copy of the Warranty/Software Handbook.

7.2 Software Service Agreement

ADC software service agreements for some ADC Products are available at a nominal fee. Contact the Technical Assistance Center at 1-800-366-3891, extension 73476 (in U.S.A. or Canada) or 952917-3476 (outside U.S.A. and Canada) for software service agreement information.

ADCP-75-132 • Issue 2C • August 2006

7.3 Repair/Exchange Policy

All repairs of ADC Products must be done by ADC or an authorized representative. Any attempt to repair or modify ADC Products without authorization from ADC voids the warranty.

If a malfunction cannot be resolved by the normal troubleshooting procedures, contact the Technical Assistance Center at 1-800-366-3891, extension 73476 (in U.S.A. or Canada) or 952-917-3476 (outside U.S.A. and Canada). A telephone consultation can sometimes resolve a problem without the need to repair or replace the ADC Product.

If, during a telephone consultation, ADC determines the ADC Product needs repair, ADC will authorize the return of the affected Product for repair and provide a Return Material Authorization number and complete shipping instructions. If time is critical, ADC can arrange to ship the replacement Product immediately. In all cases, the defective Product must be carefully packed and returned to ADC.

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ADCP-75-132 • Issue 2C • August 2006

7.4 Repair Charges

If the defect and the necessary repairs are covered by the warranty, and the applicable warranty period has not expired, the Buyer’s only payment obligation is to pay the shipping cost to return the defective Product. ADC will repair or replace the Product at no charge and pay the return shipping charges.

Otherwise, ADC will charge a percentage of the current Customer Product price for the repair or NTF (No Trouble Found). If an advance replacement is requested, the full price of a new unit will be charged initially. Upon receipt of the defective Product, ADC will credit Buyer with 20 percent of full price charged for any Product to be Out-of-Warranty. Products must be returned within (30) days to be eligible for any advance replacement credit. If repairs necessitate a visit by an ADC representative, ADC will charge the current price of a field visit plus round trip transportation charges from Minneapolis to the Buyer’s site.

7.5 Replacement/Spare Products

Replacement parts, including, but not limited to, button caps and lenses, lamps, fuses, and patch cords, are available from ADC on a special order basis. Contact the Technical Assistance Center at 1-800-366-3891, extension 73476 (in U.S.A. or Canada) or 952-917-3476 (outside U.S.A. and Canada) for additional information.

Spare products and accessories can be purchased from ADC. Contact Sales Administration at 1-800-366-3891, extension 73000 (in U.S.A. or Canada) or 952-938-8080 (outside U.S.A. and Canada) for a price quote and to place your order.

7.6 Returned Material

Contact the ADC Product Return Department at 1-800-366-3891, extension 73748 (in U.S.A. or Canada) or 952-917-3748 (outside U.S.A. and Canada) to obtain a Return Material Authorization number prior to returning an ADC Product.

All returned Products must have a Return Material Authorization (RMA) number clearly marked on the outside of the package. The Return Material Authorization number is valid for 90 days from authorization.

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7.7 Customer Information and Assistance

g

PHONE:

U.S.A. OR CANADA

Sales: 1-800-366-3891 Extension 73000 Technical Assistance: 1-800-366-3891 Connectivity Extension 73475 Wireless Extension 73476

EUROPE

Sales Administration: +32-2-712-65 00 Technical Assistance: +32-2-712-65 42

EUROPEAN TOLL FREE NUMBERS

Germany: UK: Spain: France:

Italy: 0800 782374

ASIA/PACIFIC

Sales Administration: +65-6294-9948 Technical Assistance: +65-6393-0739

ELSEWHERE

Sales Administration: +1-952-938-8080 Technical Assistance: +1-952-917-3475

WRITE:

ADC TELECOMMUNIC ATIONS, INC PO BOX 1101, MINNEAPOLIS, MN 55440-1101, USA

0180 2232923 0800 960236 900 983291 0800 914032

ADCP-75-132 • Issue 2C • August 2006

ADC TELECOMMUNICATIONS (S'PORE) PTE. LTD. 100 BEACH ROAD, #18-01, SHAW TOWERS. SINGAPORE 189702.

ADC EUROPEAN CUSTOMER SERVICE, INC BELGICASTRAAT 2, 1930 ZAVENTEM, BELGIUM

PRODUCT INFORMATION AND TECHNICAL ASSISTANCE:

connectivity.tac@adc.com

wireless.tac@adc.com

euro.tac@adc.com

asiapacific.tac@adc.com

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 further disclaims any and all liability for indirect, incidental, special, consequential or other similar damages. This disclaimer of liability applies to all products, publications and services during and after the warranty period. This pu blication may be verified at any time by contacting ADC's Technical Assistance Center.

13944-M

All Ri

hts Reserved

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www.adc.com

i