User's Manual

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Faults Reported by the Expansion Hub
Table 9-2 Faults Reported by the Expansion Hub
Fault Message LED State Possible Causes Action Impact
Expansion Hub Faults
Hardware failure
STATUS
Red Downlink fiber has
high optical loss.
Measure downlink optical fiber
loss.
Clean the downlink fiber con-
nectors.
(Refer to Section 9.2.)
Clean the Main and Expansion
Hubs’ downlink fiber ports.
(Refer to Section 9.2.)
Degraded perfor-
mance or Expan-
sion Hub and
connected RAUs
are off-line.
Main Hub internal
hardware failure.
If more than one Expansion
Hub connected to the same
Main Hub reports this failure,
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.
(Refer to Section 9.2.)
Clean the Main and Expansion
Hubs’ downlink fiber ports.
(Refer to Section 9.2.)
Expansion Hub and
connected RAUs
are off-line.
Main Hub internal
hardware failure.
If more than one Expansion
Hub connected to the same
Main Hub reports this failure,
replace the Main Hub.
Expansion Hub internal
hardware failure.
Replace the Expansion Hub.
Frequency band
not programmed
STATUS
Red Downlink fiber has
high optical loss.
Measure downlink optical fiber
loss.
Clean the downlink fiber con-
nectors.
(Refer to Section 9.2.)
Clean the Main and Expansion
Hubs’ downlink fiber ports.
(Refer to Section 9.2.)
Expansion Hub and
connected RAUs
are off-line.
Expansion Hub internal
hardware failure.
Replace the Expansion Hub.