ADTRAN DSU 56 user manual FAR END Tests, Remote Digital

Chapter 3. Test Modes

FAR END TESTS

Remote Digital

When the RDL test is initiated at the local DSU 56/64, it commands the remote DSU into loopback with the industry standard V.54 loopback pattern. The loopback point and the signal paths for the remote DSU are the same as the LOOP ONLY test for a local DSU, shown in Figure 3-4 on page 3-6. This Loopback test is performed with data from the terminal or test equipment. The RDL LED flashes during initialization of the test and turns on solid once the test is in progress.

To initiate the RDL test, perform the following steps:

1.Press SELECT five times to turn on the RDL test indicator.

2.Press TEST while this test indicator is on.

3.To terminate this test, press TEST.

RDL with Test Pattern (TP)

When the RDL WITH TP test is initiated at the local DSU 56/64, the local DSU commands the remote DSU into loopback with the industry standard V.54 loopback pattern. The loopback point and the signal paths for the remote DSU are the same as the LOOP ONLY test for a local DSU; see Figure 3-4 on page 3-6. This LOOPBACK test is performed with data from the internal test pattern generator and error detector. The RDL and PTRN LEDs flash during initialization of the test and turn on solid once the test is in progress.

To initiate the RDL WITH TP test, perform the following steps:

1.Press SELECT six times to turn on both the RDL and PTRN test indicators.

2.Press TEST while these test indicators are on.

3.To terminate this test, press the TEST switch.

61200062L1-1 DSU 56/64 User Manual 3-7