Patton electronic 1080ARC 用户手册

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   4. If the BER test indicates no errors are present,  move the V.52 tog-

gle switch to the left, thus activating the “511/E” test with periodic 
errors.  If the test is working properly, the red “Error” LED will blink 
regularly.  A successful “511/E” test will confirm that the loop is in 
place, and that the Model 1080ARC’s built-in “511” generator and 
detector are working properly.

   5. If the remote BER test indicates that errors are present, and the 

local analog loopback/BER tests showed that both Model 
1080ARCs were functioning properly, this suggests a problem with 
the twisted pair communication line connecting the two modems.  A 
common problem is improper crossing of the pairs.  Also, verify that 
the modular connections are pinned properly, and the twisted pair 
line has continuity.  If you still have errors, call Technical Support at 
(301) 975-1007.

The Model 1080ARC's V.52 BER test can be used independent of the 
V.54 loopback tests.  This requires two operators: one to initiate and 
monitor the test at both the local and the remote Model 1080ARC.  To 
use the V.52 BER test by itself, both operators should simultaneously fol-
low these steps:

   1. Locate the lower of the two toggle switches on the front panel of the 

Model 1080ARC and move it to the right.  This will activate the V.52 
BER test mode and transmit a “511” test pattern to the other unit.  If 
any errors are present, the receiving modem’s red “Error” LED will 
blink sporadically.

For this independent test to function, the “511” switch on both 

Model 1080ARCs must be turned on.

   2. If the test indicates no errors are present, move the V.52 toggle 

switch to the left, thus 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 confirm 
that the link is in place, and that the Model 1080ARC’s built-in “511” 
generator and detector are working properly.