EXPRESS DAS
Installation and Operations Manual
EXPRESS DAS Installation and Operations Manual – Version 2.2 November 2013
117
12.7.3 MRU Alarm Troubleshooting
Unit
ALARM
Cause
Management
RCPU
LINK FAIL
Loose optical cable
MRU power supply is off
Optical loss is too high
Over-curvature or cut optical cable
Check the optical cable
Check MRU power supply
Using optical power meter, check received
optical power level
Replace MRU
High Temp
Limit
Exceeding upper temp limit level
Exceeding operating temp range
Failure of temp sensor
Adjust upper temp limit level
Check operating temp range
Low Temp
Limit
Exceeding lower temp limit level
Exceeding operating temp range
Failure of temp sensor
Adjust lower temp limit level
Check operating temp range
ROPTIC
PD POWER
Optical loss is too high
Loose optical cable
Over-curvature or cut optical cable
BIU power supply is off
Loose signal cable between BIU
and ODU
Using optical power meter, check received
optical power level
Check BIU power supply
Check signal cable between BIU and ODU
LD POWER
Failure of R-optic
PSU not at +9V
Replace MRU
Tx OPTIC
RESULT
Optical loss is too high
No communication with BIU
Using optical power meter, check received
optical power level
Check optical cable connection
RFM
Tx OUT HIGH
Output power exceeds high limit
level
Reset high limit level
Check output power of MRU using
spectrum analyzer
Tx OUT LOW
Output power falls below low limit
level
Reset low limit level
Check input power of MDBU using
spectrum analyzer
Tx OUPTU
SD
Exceeding power level
Output power exceeds SD limit
level
Check SD limit level
Reset output power level
Turn HPA on
Table 12.8 – MRU Alarm Indicators in Management Software
Содержание EXPRESS Single-Carrier DAS
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