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

S2-1

Loop Test Selected

OFFLocal

ONRemote

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 loopback 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 initiate 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

 

 

 

 

E1/T1

 

 

E1/T1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

 

 

 

 

 

 

 

1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2

 

 

 

 

 

 

Fiber

 

2

 

 

 

 

 

1194

1194

 

 

 

 

 

 

 

 

 

 

3

 

 

 

 

 

 

 

 

3

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4

 

 

 

 

 

 

 

 

4

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CSU/DSUs

 

 

 

 

 

 

 

CSU/DSUs

 

 

 

 

 

 

 

 

 

 

 

 

Figure 11. 1194 Local loop

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