Because RFL™ and Hubbell® have a policy of continuous product improvement, we reserve the right to change designs and specifications without notice.
TESTING
Once the RFL VF-5A Module has been configured and installed, it should be tested for proper
operation before it is placed into service. There are two ways you can do the testing:
1. Local testing using T1 or aggregate loopback, with the system out of service.
2. End-to-end testing, with the system in service but the channel being tested taken out of service
Use the following procedure to test the RFL VF-5A:
1. If using T1 or aggregate loopback testing, set up the multiplexer loopback following the
instructions in your multiplexer operation manual.
2. Test each channel separately. If using end-to-end testing, test each channel first from Site 1 to
Site 2, then reverse the setup and test from Site 2 to Site 1.
3. Connect the output of an audio signal generator (Hewlett-Packard Model 4935A or equivalent)
to the equipment input jack for the channel being tested. Insert a 1004 kHz test tone at -16 dBm
referenced to 600 ohms.
NOTE
For the following steps, check the output on the same RFL VF-5A module if you are using
loopback testing, or on the module at the receive end if you are using end to end testing.
4. Measure the channel output at the equipment output jack.
The output should be +7 dBm referenced to 600 ohms, +0.5 dB.
5. Measure the signal-to-noise (S/N) ratio with C Message weighing.
This should be greater than 33 dB S/N.
6. Activate the M lead and observe that the corresponding M indicator LED on the transmit
module and the E indicator LED on the receive module both light up.
7. Measure idle channel noise.
This should be less than 23 dBrnc0.
8. Remove the test equipment and disconnect the loopback if one was used.
The module is now available for operation.
If there is an apparent malfunction, first check that the configuration is appropriate for the transmission
system in use. If using end-to-end testing, check that the transmit and receive configuration is
identical.
Problems may occur at the common equipment or facility level which affect the operation of this
module. Refer to your multiplexer operation manual for system analysis procedures.
RFL VF-5A RFL Electronics Inc.
June 28, 2005 22 (973) 334-3100
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