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ADCP-75-132 • Issue 2C • August 2006

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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.

Summary of content (23 pages)

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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.
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ADCP-75-132 • Issue 2C • August 2006 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.
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ADCP-75-132 • Issue 2C • August 2006 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. 1. Adjust attenuation at RIU or HPCP. Alarm Type LED LED COLOR Minor OK/NOK Yellow Problem: The DHU is receiving a minor alarm signal from the DEU.
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ADCP-75-132 • Issue 2C • August 2006 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. 1. Remove cause of air-flow blockage. 2. Reduce ambient temperature. 3. Replace fan (see Subsection 6.5).
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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. 1. Clean optical connector and then test optical fiber.
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ADCP-75-132 • Issue 2C • August 2006 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. 1. Reset DHU and DRU(s) frequency switches to the same band. Alarm Type LED LED COLOR None All Normal Problem: Loss of phone service from one DRU.
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ADCP-75-132 • Issue 2C • August 2006 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.
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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.
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ADCP-75-132 • Issue 2C • August 2006 OPTICAL LOOPBACK CONNECTION DETAIL 17282-A OPTICAL TRANSCEIVER OPTICAL LOOPBACK Figure 28. DRU Loopback Test 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. 22. At the DHU or supporting DEU, place the PORT ON/OFF switch in the OFF position (press O). 23.
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ADCP-75-132 • Issue 2C • August 2006 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.
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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.
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ADCP-75-132 • Issue 2C • August 2006 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.
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ADCP-75-132 • Issue 2C • August 2006 16173-B Figure 32. Removing Fan From Grill 13. Place the DHU or DEU AC power On/Off switch in the ON position (press I). 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.
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ADCP-75-132 • Issue 2C • August 2006 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.
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ADCP-75-132 • Issue 2C • August 2006 RELEASE LEVER TX RX TYPE A TRANSCEIVER TYPE B TRANSCEIVER 17280-A RELEASE TAB TX DETAIL DRAWING OF TYPE A AND TYPE B MODULAR OPTICAL TRANSCEIVERS RX Figure 34. DHU or DEU Optical Transceiver Installation 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. 11.
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ADCP-75-132 • Issue 2C • August 2006 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.
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ADCP-75-132 • Issue 2C • August 2006 RELEASE LEVER TX RX TYPE A TRANSCEIVER TYPE B TRANSCEIVER 17286-A RELEASE TAB TX DETAIL DRAWING OF TYPE A AND TYPE B MODULAR OPTICAL TRANSCEIVERS RX Figure 36. DRU Optical Transceiver Installation 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. 11.
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ADCP-75-132 • Issue 2C • August 2006 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.
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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).
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ADCP-75-132 • Issue 2C • August 2006 7.7 Customer Information and Assistance PHONE: U.S.A.
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