Black Box ME475A-R2, Manual

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Operation
Using the V.52 BER Test Independently
The V.52 BER test can be used independently of the V.54 loopback tests. This requires
two operators: one to initiate and monitor the test at the local ME475A-R2, and one at
the remote ME475A-R2. To use the V.52 BER test by itself, both operators should
simultaneously follow these steps:
1. Locate the “511/511E” toggle switch on the front panel of the unit and move it UP.
This activates the V.52 BER test mode and transmits a “511” test pattern to the
other unit. If any errors are present, the receiving modem's red “ERROR” LED
will blink sporadically.
Note For this test to function, the “511” switch on both ME475A-R2 units must be on.
2. If the test indicates no errors are present, move the V.52 toggle switch DOWN,
activating the “511/E” test with periodic errors present. If the test is working prop-
erly, the receiving modem’s red “ERROR” LED will blink
regularly . A successful
“511/E” test will confirm that the link is in place, and that the ME475A-R2’s built-
in “511” generator and detector are working properly.
4.5 POWER-DOWN
Turn off the ME475A-R2 by simply unplugging the AC or DC power source from the
wall. There is no power switch.