CANOGA PERKINS 3240S SNMP Managed Fiber Optic Multiplexer - Manual (Page 84)

3240S F I B E R O P T I C M U L T I P L E X E R
3240S Fiber Optic Multiplexer
5.2 Loopback Hardware
The previously listed equipment is necessary for executing all of the tests outlined in the accompanying troubleshooting
flowchart.
When using a fiber optic cable jumper and optical power meter, set the optical power switch to HI and refer to the flowchart.
In the event that all channels are malfunctioning, verify the following conditions before starting the procedure for both
standard and redundant optics versions.
1. Ensure that the power supply LED indicators of each multiplexer are illuminated:
a.
POWER B on the front panel of the chassis, or POWER A and B for a redundant system.
b. PWR on the rear of the chassis.
2. Check that the loopback switch is in the NORM position at each multiplexer.
3. Check that the transmit power level switch is set to HI.
4. Check the integrity of the Rx and Tx connections for each multiplexer.
5. Check the SYNC LOSS and LOOP LED indicators. They should not be illuminated during normal operation. Various
types of multiplexer malfunctions can cause erroneous indications.
Refer to Chapter 2 for functional definitions for the SYNC LOSS and LOOP LEDs. Note that with the Rx
fiber disconnected, or with a defective Rx fiber cable, the optical signal is lost, and the SYNC LOSS and
LOOP Indicators should turn on. This condition will be observed at various points when stepping
through the troubleshooting flowchart.
Once the above conditions have been checked, with power applied to both multiplexers and all related switches correctly set,
follow the troubleshooting flowchart to determine the faulty component. While performing these procedures, the optical
power switches on both multiplexers should be set in the HI position.
During the troubleshooting procedure, the 3240S in which the testing begins, will be referred to as the "local" multiplexer,
while the second 3240S will be referred to as the "remote." This nomenclature will be true regardless of which end of the link
is used to perform a given test.
If all channels are malfunctioning on a redundant fiber system, and the units have not switched
automatically to the redundant path, contact Canoga Perkins' Customer Service Department for instruc-
tions. If the units have switched to the redundant path but still malfunction, refer to the troubleshooting
flowchart.
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