User's Manual Part 2
Table Of Contents
- SECTION 3: OPERATION
- 1 BEFORE STARTING OPERATION
- 2 TURN-UP SYSTEM AND VERIFY OPERATION
- 2.1 Reference Procedure: Determine Forward Path Input Signal Level
- 2.2 Reference Procedure: Enter Site Name and Site Number
- 2.3 Reference Procedure: Enter Host Forward Attenuation
- 2.4 Reference Procedure: Determine Output Signal Level at RU Antenna Port
- 2.5 Reference Procedure: Enter Remote Forward Attenuation
- 2.6 Reference Procedure: Enter Host Reverse Attenuation
- 2.7 Reference Procedure: Enter Host Forward and Reverse Delay
- SECTION 4: MAINTENANCE
- SECTION 5: GENERAL INFORMATION
ADCP-75-187 • Preliminary Issue 1B • November 2005 • Section 4: MAINTENANCE
Page 4-6
© 2005, ADC Telecommunications, Inc.
Table 4-4. Host Unit Fault/Alarm Corrective Action
PROBLEM A: The HU is not powered.
POSSIBLE CAUSE CORRECTIVE ACTION/COMMENTS
1. The HU is turned off.
2. The fuse is open/removed from the fuse panel
or the DC power has failed.
1. Place On/Off switch in the On position.
2. Check DC power source, repair as needed, and
replace or reinstall fuse at fuse panel.
PROBLEM B: The HU is overheating.
POSSIBLE CAUSE CORRECTIVE ACTION/COMMENTS
1. Air intake or exhaust opening to HU chassis
is blocked
2. Ambient temperature > 50º C/122º F.
3. Faulty fan.
4. The HU has failed.
1. Remove cause of air-flow blockage.
2. Reduce ambient temperature.
3. Replace HU fan (See applicable manual).
4. Replace HU.
Host Unit Front Panel LED Software Fault/Status Indicator Corrective Action
or Reference
Table 4-3. Host Unit Fault/Alarm Isolation Diagram, continued
Fwd/Rev
(Port 1/Port 2)
See Table 4-4
Problem E
See Table 4-4
Problem E
Green - Normal
Red - Major Alarm
Pri Rx Light - No light received
over optical reverse path
Pri Rx Errors - Excessive errors
received over optical reverse path
See specific
fault indicator
See specific
fault indiator
Minor Contact Output - Minor alarm
reported by HU or STM
Major Contact Output - Major alarm
reported by HU or STM
Remote Lost - The HU cannot
communicate with remote (STM)
EMS Link Status - The EMS cannot
communicate with HU
No Associated LED
See Table 4-4
Problem E
See Table 4-4
Problem F
20583-A
Drive
851-869
(REAR
ACCESS)
Green - Normal
Yellow - Minor Alarm
Red - Major Alarm
RF Underdrive 800 MHz - 800 MHz
forward path RF signal level too low
RF Overdrive 800 MHz - 800 MHz
forward path RF signal level too high
Table 4-4
Problem C
Table 4-4
Problem D
Drive
935-940
(REAR
ACCESS)
Green - Normal
Yellow - Minor Alarm
Red - Major Alarm
RF Underdrive 900 MHz - 900 MHz
forward path RF signal level too low
RF Overdrive 900 MHz - 900 MHz
forward path RF signal level too high
Table 4-4
Problem C
Table 4-4
Problem D
Drive
(FRONT
ACCESS)
Green - Normal
Yellow - Minor Alarm
Red - Major Alarm
RF Underdrive - Forward path
RF signal level too low
RF Overdrive - Forward path
RF signal level too high
Table 4-4
Problem C
Table 4-4
Problem D