Because RFL™ and Hubbell® have a policy of continuous product improvement, we reserve the right to change designs and specifications without notice.
RFL DA-291B RFL Electronics Inc.
April 13, 2010 29 (973)
334-3100
TESTING
When the DA-291B Data Module has been configured and installed, test it for proper operation before
putting it into service. There are two ways you can do the testing:
1. Local testing using the multiplexer equipment loopback, with the system out of service.
2. End-to-end testing using far end module data loopback, with the system in service but the
channel being tested out of service.
Use the following procedure to test the modules:
1. For local testing, activate the multiplexer equipment loopback following the instructions
in your multiplexer operation manual.
For end-to-end testing, set the loopback (LOOP) switch on the far end DA-291B module to the
ON position, and set the multiplexer at one end of the circuit to use loop timing.
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 a DB-9 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.
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 far end module to the OFF position.
The system is now operational.
Testing with the fiber module adapters is identical. The fiber connection can be looped back from
transmit to receive as well. If the problem appears to be in the fiber head the following check list
should be used.
Is the transmit LED on or flashing? If not the DA-291B is not attempting to transmit
any data. The problem is probably in the DA-291B or elsewhere in the network.
Is the receive LED on or flashing? If not no data is being received over the fiber. The
problem is probably in the fiber or repeater equipment.
Are the fibers properly attached? The transmit connector on the module adapter should
go to receive connector on the repeater and vice versa.
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 operation manual for system analysis procedures.
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