Because RFL™ and Hubbell® have a policy of continuous product improvement, we reserve the right to change designs and specifications without notice.
LOOPBACK TESTING
A local loopback test should be performed when the module is first installed, or any time the integrity
of the module needs to be checked. The loopback test can be performed on modules in terminal
systems or drop/insert systems. The loopback test is a tool for locating problems, but is no substitute
for troubleshooting expertise.
Before starting a loopback test, make sure the following three conditions have been met:
1. The OCUDP module and I/O adapter must be installed in an RFL IMUX 2000 chassis.
2. Power must be applied to the system.
3. The module must be out of service.
A telecommunications CSU/DSU test set that can accept DDS loop signals will be required for the
loopback test (Black Box Corporation CSU/DSU MS or equivalent).
LOCAL LOOPBACK TEST PROCEDURE
1. Press the Group toggle switch on the CM-3 left or right until the function display reads LPBK.
Then push the SET toggle switch left until the function display reads EqLB. At this time push
the SET toggle switch twice to the right.
NOTE
Equipment Loopback on the CM-3 will loopback all DS0 channels within that shelf
The green LED above the SET toggle switch should blink after the first push and
should be steady after the second push.
The yellow loopback LED on the CM-3 and the yellow LED on the power supply
should be lit, indicating that the system is in local loopback.
2. Connect the test set to the cable assembly in accordance with the manufacturers procedures.
Then perform a bit error rate test.
RFL OCUDP RFL Electronics Inc.
July 15, 2010 24 (973) 334-3100
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