User's Manual

Maintenance, Troubleshooting, and Technical Assistance PRELIMINARY
10-6 InterReach Unison User Guide and Reference Manual
PN 8700-10
620003-0 Rev. A
Expansion Hub Faults
EHn/RAU reports
fault condition
LINK Green Any Expansion Hub
or RAU fault
Use the AdminManager to
check for Expansion Hub and
RAU faults. Proceed to
Expansion Hub or RAU trou-
bleshooting section.
EHn and/or RAU
off-line
E-HUB/
RAU
Red
Table 10-2 Expansion Hub Faults
Fault Message LED State Possible Causes Action Impact
Hardware failure
STATUS
Red Downlink fiber has
high optical loss.
Measure downlink optical fiber
loss.
Clean the downlink fiber con-
nectors.
Clean the Main and Expansion
Hubs’ downlink fiber ports.
Expansion Hub and
connected RAUs
are off-line
Main Hub internal
hardware failure.
If common point of failure for
more than one Expansion Hub,
replace the Main Hub.
Expansion Hub internal
hardware failure.
Replace the Expansion Hub.
PLL unlock
STATUS
Red Downlink fiber has
high optical loss.
Measure downlink optical fiber
loss.
Clean the downlink fiber con-
nectors.
Clean the Main and Expansion
Hubs’ downlink fiber ports.
Expansion Hub and
connected RAUs
are off-line
Main Hub internal
hardware failure.
If common point of failure for
more than one Expansion Hub,
replace the Main Hub.
Expansion Hub internal
hardware failure.
Replace the Expansion Hub.
Table 10-1 Main Hub Faults (continued)
Fault Message LED State Possible Causes Action Impact