EXPRESS DAS
Installation and Operations Manual
116
EXPRESS DAS Installation and Operations Manual – Version 2.2 November 2013
12.7.2 BIU Alarm Troubleshooting
Unit
ALARM
Cause
Management
MPSU
DC ALM
Output over current
Output low voltage
Using DVM, check -48/ +9/+6V voltage
levels
Pull out each module (MDBU, MCPU)
and find failed module
Replace MPSU
MCPU
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
Replace MCPU
Low Temp Limit
Incorrect setting of lower temp limit
level
Exceeding operating temp range
Failure of temp sensor
Adjust lower temp limit level
Check operating temp range
Replace MCPU
Ext.ALM#1~4
External device alarm
Cross-connect of N.O and N.C
Failure of relay component in the
MCPU
Reconnect N.O and N.C
Replace MCPU
ALM In #1~3
External device alarm
Cross-connect GND and ALM In
Wrong setting of active high/low
Reconnect GND and ALM In
Set again for active high/low
Replace MCPU
MDBU
Tx IN HIGH
Input power exceeds high limit level
Reset high limit level
Check input power of MDBU using
spectrum analyzer
Replace MDBU
Tx IN LOW
Input power falls below low limit
level
Reset low limit level
Check input power of MDBU using
spectrum analyzer
Replace MDBU
Rx OUT HIGH
Output power exceeds high limit
level
Reset high limit level
Check output power of MDBU using
spectrum analyzer
Replace MDBU
Table 12.7 – BIU Alarm Indicators in Management Software
Содержание EXPRESS Single-Carrier DAS
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