Cisco Cisco 1 GHz GainStar Node Installation Guide
Low or Degraded Reverse RF Signal
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Low or Degraded Reverse RF Signal
The reverse RF signal can be measured at the mainboard reverse input test point and
reverse OMI test points.
reverse OMI test points.
Low or Degraded Reverse RF Signal Troubleshooting Table
Before you begin troubleshooting for low or degraded reverse RF signal, verify that
the node is receiving the proper reverse RF input signals from the downstream
amplifiers at the node reverse input ports.
Important: You cannot balance the amplifier without the proper reverse RF input
signals.
Make sure that you have configured the mainboard according to the specifications in
the design print and that the node has warmed up for approximately one hour.
Make sure that you are using the proper total tilt reference when setting up the
receiving levels.
Refer to the reverse equalizer charts in Technical Information for more information.
the node is receiving the proper reverse RF input signals from the downstream
amplifiers at the node reverse input ports.
Important: You cannot balance the amplifier without the proper reverse RF input
signals.
Make sure that you have configured the mainboard according to the specifications in
the design print and that the node has warmed up for approximately one hour.
Make sure that you are using the proper total tilt reference when setting up the
receiving levels.
Refer to the reverse equalizer charts in Technical Information for more information.
Possible Cause
Solution
Low or degraded reverse RF signal at the
reverse input test point(s).
reverse input test point(s).
Verify that the node is receiving the
proper reverse RF input signal.
Important: You cannot balance the node
without the proper reverse RF input
signal.
proper reverse RF input signal.
Important: You cannot balance the node
without the proper reverse RF input
signal.
Proper reverse RF signal at the reverse
input test point, but low or degraded
signal at the OMI test point.
input test point, but low or degraded
signal at the OMI test point.
Measure the reverse input test point and
the OMI test point. Subtract the reverse
amplifier gain, add the pad values and
EQ insertion loss to verify the proper
reverse amplifier gain.
Verify that all the proper accessories,
pads, EQs, Reverse amplifier, 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 all the unused RF ports are
properly terminated.
the OMI test point. Subtract the reverse
amplifier gain, add the pad values and
EQ insertion loss to verify the proper
reverse amplifier gain.
Verify that all the proper accessories,
pads, EQs, Reverse amplifier, 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 all the unused RF ports are
properly terminated.