Test Modes; Local Line Loopback (Llb) - Patton electronics 1082/F User Manual

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5.3 TEST MODES

The Model 1082 offers two proprietary loopback test modes, plus a built-

in V.52 BER test pattern generator, to evaluate the condition of the

modems and the communication link. These tests can be activated phys-

ically from the front panel, or via the interface.

The Local Line Loopback (LLB) test checks the operation of the local

Model 1082, and is performed separately on each unit. Any data sent to

the local Model 1082 in this test mode will be echoed (returned) back to

the user device (see Figure 11). For example, characters typed on the

keyboard of a terminal will appear on the terminal screen.

To perform an LLB test, follow these steps:

1. Activate LLB. By moving the front panel toggle switch up to "Local".

Once LLB is activated, the Model 1082 transmitter output is con-

nected to its own receiver. Data is also looped back to the line. The

LED should be lit.

2. Verify that the data terminal equipment is operating properly and

can be used for a test.

3. Perform a V.52 BER (bit error rate) test as described in "Using the

V.52 (BER) test pattern generator" on page 23. If the BER test

equipment indicates no faults, but the data terminal indicates a fault,

follow the manufacturer's checkout procedures for the data terminal.

Also, check the interface cable between the terminal and the Model

1082.

LLB initiated

Figure 11. Local Line loopback

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