Filter
Top Products
25
down” command is implemented by the pattern “100” in the data stream
for a minimum of 5 seconds.
The NetLink 2701/I will respond to Universal Loopback De-activate to
clear all central office loops.
Using the V.52 (BER) Test Pattern Generator
To use the V.52 BER tests in conjunction with the Remote Digital Loop-
back tests (or with Local Line Loopback tests), follow these instructions:
1. Locate the “511/511E” toggle switch on the front panel of the 2701/I
and move it UP. This activates the V.52 BER test mode and trans-
mits a “511” test pattern into the loop. If any errors are present, the
local modem’s red “ER” LED will blink sporadically.
2. If the above test indicates no errors are present, move the V.52 tog-
gle switch DOWN, activating the “511/E” test with errors present. If
the test is working properly, the local modem's red “ER” LED will
blink once per second. A successful “511/E” test will confirm that
the link is in place, and that the Model 2701/I’s built-in “511” genera-
tor and detector are working properly.
Note The above V.52 BER tests can be used independently of the
Remote Digital Loopback tests. This requires two operators:
one to initiate and monitor the tests at the local Model 2701/I,
and one to do the same at the remote Model 2701/I. In this
case, the test pattern sent by each Model 2701/I will not be
looped back, but will be transmitted down the line to the other
Model 2701/I. While one operator initiates test, the other moni-
tors for errors.