Patton electronic 1080A-64 - Manual (Page 26)

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Note Make sure DIP switch S3-6 is ON; and DIP switch S2-6 is OFF.
2. Perform a BER (bit error rate) test on the system.
3. If the BER test equipment indicates a fault, and the Local Analog
Loopback test was successful for both Model 1080A Series units,
you may have a problem with the twisted pair line between the
modems. You should then test the twisted pair line for proper con-
nections and continuity.
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 1080A, and one at the remote 1080A. 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 trans-
mits 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 1080A Series
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 properly, the receiving modem’s red
“ERROR” LED will blink
regularly . A successful “511/E” test will con-
firm that the link is in place, and that the Model 1080A Series’ built-in
“511” generator and detector are working properly.
5.5 POWER-DOWN
Turn off the Model 1080A Series by simply unplugging the AC or DC
power source from the wall. There is no power switch.