Cisco Cisco OptoStar II Driver Amplifier Guide De Montage
General Troubleshooting Information, Continued
Alarm
Possible Cause
Servicing Instruction
Low RF Output
Level
Low optical output
power in reverse
transmitter of the
node
Connectors between
the reverse
transmitter and the
optical splitter
mismatch
Connectors between
the reverse
transmitter and the
optical splitter
contain dusts or
contaminants
Splitter failure
Fiber connector and
the reverse receiver
connector mismatch
Cable or connector
failure at RF output
port
Amplifier chip
failure – gain
degraded
Check the optical output
power in reverse transmitter
of the node
Check whether all the optical
connectors match
Make sure all the mating
surfaces of the fiber are clean
Check whether the RF
connectors match, and check
for connector failure
Check splitter for optical
signal
Check whether the optical
input power is between
-16dBm and +2dBm with an
optical power meter
Select Automatic Gain
Control mode to adjust the
RF output level
Measure whether the RF
strength at RF output meets
the specification: optical
input power is -10 dBm to +2
dBm, OMI = 16%, AGC
mode; RF output 31
dBmV/channel
Select Manual Gain Control
mode to adjust the RF output
level
Measure whether the RF
strength at RF output meets
the specification: optical
input power is -7 dBm, OMI
= 16%, MGC mode, gain 0
dB; RF output 37
dBmV/channel
If the RF output level is still
lower than the specifications,
contact the manufacturer for
servicing
Continued on next page
OL-29663-03
Troubleshooting
4-5