Cisco GainMaker Optoelectronic Node 1GHz with 55 70 MHz Split Guía De Instalación
Low RF Output
Low RF Output
Use the steps in the following table to troubleshoot low RF output of the optical
receiver or amplifier.
Possible cause
Solution
Low RF input at the transmitter.
Verify correct RF input to the transmitter.
Check the amplifiers preceding the transmitter
for proper inputs and outputs.
Defective or improperly spliced
optical coupler (between headend
transmitter and node).
Replace or re-splice the coupler.
Make sure all unused fiber pigtails are
terminated.
Unterminated leg of the optical
coupler.
Make sure all unused fiber pigtails are
terminated.
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.
If connectors are dirty, clean them. Refer to
Cleaning Optical Connectors (on page 99).
Inspect fiber routing and management tray for
fibers that might be wrapped too tightly.
Check for proper optical output from
transmitter.
Check the link loss.
Replace any scratched connectors.
Unterminated leg of the optical
coupler.
Make sure all unused fiber pigtails are
terminated.
Failure in the optical receiver.
Replace the receiver module. Use the output
test point of the optical receiver to verify
output levels.
Faulty coax jumper from the node
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
Note: An authorized repair center must
perform this procedure.
OL-30326-02
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