Cisco GainMaker Optoelectronic Node 1GHz with 65 86 MHz Split Installation Guide
Chapter 4 Troubleshooting
Miscellaneous Problems
Complete the following steps to troubleshoot miscellaneous problems.
Possible cause
Suggestion
No RF present in network.
Check network power supply.
Verify that power is present at the node power
supply.
Check that the optical signal is present on fiber.
Check that voltage level on the optical receiver
is the same as it was when commissioned.
Check that output RF is present at receiver test
point.
Check that cable from interface board is
connected to module and that cable has not
been crushed.
Poor pictures on network.
Check RF input level at transmitter.
Check optical output of transmitter.
Check optical levels at forward optical
receiver.
Check and clean fiber connectors. See Cleaning
Optical Connectors (on page 78).
Check RF output levels at the optical receiver.
Check RF levels at node outputs.
No RF output from headend or
hub reverse optical receiver.
Check receiver AC power.
Check fiber connector in headend or hub.
Check fiber for optical input level.
Check fiber connections.
Check reverse transmitter in node.
Check RF input level to transmitter in node.
Check RF jumper cable from optical interface
board to amplifier module.
Ensure that cable is connected and not
crushed.
Check for RF at amplifier reverse input test
point.
Excessive noise in return.
Check fiber connections and clean if necessary.
Check noise level at transmitter test point.
Individual ports can be isolated and return
levels can be lowered by inserting higher value
pads in the input pad socket.
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