To test the fiber connection, do the following:

1.Set S2-1 to the ON position.

2.Locate the port label (P1-P4) above or below the front panel switches, Activate Remote Loopback for a network port by moving the appropriate front panel toggle switch UP or DOWN. A green TM LED corresponding to the port under test will turn on. A BER test can now be initiated using a BER tester or the built-in 511/511E pat- tern generator.

3.Upon completion of the remote loop test, return the front panel switch to center position. After approximately 30 seconds, the TM LED should turn off.

7.3THE V.52 TEST PATTERN GENERATOR

To use the V.52 BER test in conjunction with the Local or Remote Loop- backs, follow these instructions:

1.Locate the “511/511E” toggle switch on the front panel of the Model 1194 and move it UP. This activates the V.52 BER test mode and transmits a “511” test pattern into the loop. If any errors are present, the red “ERR” LED corresponding to the port under test will blink intermittently.

2.If the above test indicates no errors, move the V.52 toggle switch down, activating the “511/E” test with errors present. If the test is working properly, the local 1194 red “ERR” LED will blink approxi- mately once every 2 seconds. A successful “511/E” test will confirm that the link is in place, and that the Model 1194’s built-in “511” gen- erator and detector are working properly.

Note Note: When the unit is set for Network Clock Mode, the unit will derive its timing from the Network (T1/E1)Interface. Failure to connect to the network may result in bit errors during the 511 or 511/E test.

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