Cisco GainMaker High Gain Balanced Triple Amp 1GHz with 40 52 MHz Split インストールガイド
Chapter 4 Troubleshooting
88
4011881 Rev B
Troubleshooting Carrier-to-Noise Problems
Complete the following steps to troubleshoot carrier-to-noise problems.
Possible cause
Solution
Low optical input to the node. The
optical input level should be
typically 0 dBm. Refer to the system
design print for the proper level.
optical input level should be
typically 0 dBm. Refer to the system
design print for the proper level.
If connectors are dirty, clean them. Refer to
Cleaning Optical Connectors.
Cleaning Optical Connectors.
Inspect fiber routing and management tray for
fibers that might be wrapped too tightly.
fibers that might be wrapped too tightly.
Check for proper optical output from
transmitter.
transmitter.
Check the link loss.
Replace any scratched connectors.
Low RF input at transmitter.
Verify RF input to the transmitter.
Check all amplifiers preceding the transmitter
for proper inputs and outputs.
for proper inputs and outputs.
Failure in optical receiver.
Replace the receiver module. Use the output
test point of the optical receiver to verify
output levels.
test point of the optical receiver to verify
output levels.
Broken SMB jumper from node
optical motherboard to the RF
amplifier.
optical motherboard to the RF
amplifier.
Replace the jumper between the optical
motherboard and the RF amplifier forward
input.
Note: An authorized repair center must
perform this procedure.
motherboard and the RF amplifier forward
input.
Note: An authorized repair center must
perform this procedure.
Defective or improperly spliced
optical coupler between headend
transmitter and node.
optical coupler between headend
transmitter and node.
Replace or re-splice the coupler.
Make sure all unused fiber pigtails are
terminated.
terminated.
Unterminated leg of optical coupler.
Make sure all unused fiber pigtails are
terminated.
terminated.