ADC Telecommunications Inc. DVLRCSSMR Benutzerhandbuch
ADCP-75-134 • Issue A • April 2002 • Section 5: Maintenance
Page 5-7
©
2002, ADC Telecommunications, Inc.
During
normal HU operation, all LED’s should be green except the STANDBY LED which
should
be Off. When a Minor alarm occurs, one or more of the LED’s will turn yellow. When a
Major
alarm occurs, one or more of the LED’s will turn red.
Table 5-6. Host Unit Fault Isolation and Troubleshooting
Alarm Type
LED
Color
Minor
HOST UNIT
Yellow
PROBLEM: The HU is overheating.
POSSIBLE CAUSE
CORRECTIVE ACTION/COMMENTS
1.
Air intake or exhaust opening to HU chassis
is blocked
2.
2.
Ambient temperature > 50º C/122º F.
3.
Faulty fan.
1.
Remove cause of air-flow blockage.
2.
Reduce ambient temperature.
3.
).
Alarm Type
LED
Color
Minor
REMOTE UNIT
Yellow
PROBLEM: A minor alarm is detected at the RU.
POSSIBLE CAUSE
CORRECTIVE ACTION/COMMENTS
1.
The STM or LPA is overheating.
1.
Check RU for alarms and refer to
Alarm Type
LED
Color
Minor
DRIVE
Yellow
PROBLEM: The RF input signal level is below the underdrive threshold.
POSSIBLE CAUSE
CORRECTIVE ACTION/COMMENTS
1.
Faulty coaxial connection between the
HU and the EBTS.
2.
2.
Incorrect attenuation in forward path RF coax-
ial link.
1.
Check forward path signal level at the HU.
2.
Check Host Forward Attenuator setting and
adjust if attenuation is too high.
Alarm Type
LED
Color
Major
HOST UNIT
Red
PROBLEM: Internal fault detected in HU.
POSSIBLE CAUSE
CORRECTIVE ACTION/COMMENTS
1.
The HU has failed.
1.
Replace the HU.
Alarm Type
LED
Color
Major
REMOTE UNIT
Red
PROBLEM: A major alarm is detected at the RU.
POSSIBLE CAUSE
CORRECTIVE ACTION/COMMENTS
1.
The STM or LPA has failed, the STM is not
receiving a forward path optical signal, or the
RU cabinet door is open.
1.
Check RU for alarms and refer to