Because RFL™ and Hubbell® have a policy of continuous product improvement, we reserve the right to change designs and specifications without notice.
RFL DS-961D RFL Electronics Inc.
October 14, 2004 18 (973) 334-3100
TESTING
When the RFL DS-961D Data Module has been configured and installed, it should be tested for proper
operation before it is put into service.
There are two ways you can do the testing:
1. Local testing using loopback, with the system out of service.
2. End-to-end testing using far end loopback, with the system in service but the channel
being tested taken out of service.
Use the following procedure to test the modules:
1. For loopback testing, set up the multiplexer loopback following the instructions in the section on
System Checkout Procedures in your multiplexer instruction manual.
For end to end testing, set the LOOP switch on the far end system to the ON position.
2. Connect a data error analyzer (Telecommunication Techniques Corp. Fireberd 2000 or
equivalent) to the jack for channel one on the back of the module adapter, using an RJ-11 cable.
3. Check for synchronization on the output signal.
4. Send single errors on the transmit side and check for single errors on the receive side.
5. Run for 30 seconds and confirm that the signal remains error-free. Observe that the “TX FAULT”
LED and the “FRM” LED are not lit.
6. Repeat test on each channel set up for use in the current configuration.
7. If you used end to end testing, return the LOOP switch at the far end to the OFF position. The
system is now operational.
If there is an apparent malfunction during end to end testing, first check that the configuration at the
two ends is identical.
Most problems occur at the common equipment or facility level. Refer to the Troubleshooting section
in your multiplexer instruction manual for system analysis procedures.
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