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7.0 TEST MODES
The following section describes the test patterns and loopbacks used in
the Model 1194. The Model 1194 offers local/remote loopback tests, plus
a built-in V.52 BER test pattern generator to evaluate the condition of the
modems and the network (T1/E1 lines) and fiber links. These tests can
be activated physically from the front panel. Before initiating a loopback
test, the user needs to select Local or Remote loops via DIP switch S2-1
located on the underside of the unit
7.1 LOCAL LOOPBACK TEST
This feature is used to test the T1 or E1 link on a per-port basis. Each of
the four T1 or E1 ports can be tested to verify the proper operation of the
line and the device at the remote end of the T1/E1 link. During local loop-
back the corresponding E1 or T1 port in the Model 1194 will transmit the
data received back to the originating device.
Set S2-1 to the OFF position, this setting prepares the Model 1194 for
local loop. The model 1194 has 3 front panel toggle switches, one of the
switches initiates 511/511E test patterns, the other two switches will ini-
tiate loops for a network port, the switches have labels corresponding to
network ports (P1 through P4). For example, to initiate a local loop on
network port 1, move the first switch from the left UP towards label “P1”.
See Figure 11 loop diagram
Figure 11.
1194 Local loop
S2-1
Loop Test Selected
OFF
Local
ON
Remote
E1/T1
Fiber
CSU/DSUs
4
3
2
1
4
3
2
1
1194
1194
E1/T1
CSU/DSUs
