Cisco GainMaker Optoelectronic Node 1GHz with 65 86 MHz Split Installation Guide
Chapter 4 Troubleshooting
Low or Degraded Reverse RF Signal
The reverse RF signal can be measured at the amplifier module reverse input test
point and the reverse optical transmitter output test point.
Low or Degraded Reverse RF Signal Troubleshooting Table
Before you begin troubleshooting for no reverse RF signal, verify that the amplifier is
receiving the proper reverse RF input signals from the downstream amplifiers.
Important: You cannot balance the amplifier without the proper reverse RF input
Important: You cannot balance the amplifier without the proper reverse RF input
signals.
Make sure you have configured the amplifier module according to the specifications
Make sure you have configured the amplifier module according to the specifications
in the design print, and that the amplifier has warmed up for approximately one
hour.
Make sure you are using the proper total tilt reference when setting receive levels.
Important: If the amplifier cover was ever removed, make sure it was properly
Make sure you are using the proper total tilt reference when setting receive levels.
Important: If the amplifier cover was ever removed, make sure it was properly
reinstalled. Improperly reinstalling the amplifier module cover may result in RF
signal degradation.
Possible cause
Solution
Low or degraded reverse RF signal
at the reverse input test point(s).
Verify that the amplifier is receiving the proper
reverse RF input signals from the downstream
amplifiers.
Important: You cannot balance the amplifier
Important: You cannot balance the amplifier
without the proper reverse RF input signals.
There are proper reverse RF signals
at the reverse input test points, but a
low or degraded signal at the reverse
transmitter output test point.
Verify that the amplifier module is receiving
the proper DC voltages. Refer to No DC Power
(on page 87).
Verify that all the proper accessories, pads,
EQs, and signal directors (if applicable) are
firmly installed in the correct locations.
Verify that the factory installed accessories are
firmly installed in the correct locations.
Verify that the reverse switch and its jumpers
are properly and firmly installed.
Check/replace the wiring harness.
Note: Verifying factory installations involves
Note: Verifying factory installations involves
removing the amplifier module cover. Reinstall
the amplifier module cover properly or RF
signal degradation may result.
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