ADC H2TU-C-388 Manual de usuario Pagina 52

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Testing 152-388-100-02, Issue 2
44 June 6, 2000 H2TU-C-388 List 1
4 Have the CO tester send the NLOC (4-in-7) inband loopup for 5 seconds. You should be able to observe the
NLOC message on the front-panel display. (The Status LED on the front panel should be yellow, and the
loopback mode should also be identified on the Span Status screen.)
5 Repeat Step 2. If the test passes, the problem is in the downstream direction. If it fails, the problem is in the
upstream direction.
Figure 27. Loopback Modes
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