EXPRESS DAS
Installation and Operations Manual
118
EXPRESS DAS Installation and Operations Manual – Version 2.2 November 2013
12.7.4 OEU Alarm Troubleshooting
Unit
ALARM
Cause
Management
EPSU
DC Alarm
Output over current
Output low voltage
Using DVM, check -48V/+9V/+6V voltage
levels
Check each module (DOU, EWDM,
ERFU) and find failed module
Replace EPSU
ECPU
High Temp
Limit
Incorrect setting of upper temp
limit level
Exceeding operating temp
range
Failure of temp sensor
Adjust upper temp limit level
Check operating temp range
Low Temp
Limit
Incorrect setting of low temp
limit level
Exceeding operating temp
range
Failure of temp sensor
Adjust lower temp limit level
Check operating temp range
LINK FAIL
Loose optical cable
BIU power supply is off
Optical loss is too high
Over-curvature or cut cable
Check the optical cable
Check BIU power supply
Using optical power meter, check
received optical power level
EOPTIC
PD POWER
Loose optical cable
BIU power supply is off
Optical loss is too high
Over-curvature or cut cable
Check the optical cable
Check BIU power supply
Using optical power meter, check
received optical power level
LD POWER
Failure of R-optic
PSU not at +9V
Replace MRU
RESULT
Optical loss is too high
No communication with BIU
Using optical power meter, check
received optical power level
Check optical cable connection
DOU
Overload Alarm
Tx input level to DOU is too high
Check output power of MDBU
Check input power of MDBU
LD POWER
Failure of DOU
PSU not at +9V
Replace DOU
Using DVM, check voltage of +9V
PD POWER
Loose optical cable
MRU power supply is off
Optical loss is too high
Over-curvature or cut cable
Check the optical cable
Check MRU power supply
Using optical power meter, check
received optical power level
Table 12.9 – OEU Alarm Indicators in Management Software
Содержание EXPRESS Single-Carrier DAS
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