ADC HiGain HLU-200 User Manual page 34

Table 11. HLU-200 GNLB Test Procedures Without HiGain Doublers
Step
1 Have the CO tester send the HRU-412 (3-in-7) inband loop-up code for five seconds. Observe that
an HRU NREM loopback is in effect (see Figure 7 for non-doubler loopback configurations, Figure
8 for doubler loopback configurations). The loopback state is indicated by the GREEN LOOP LED
on the front panel and is also displayed in the Span Status screen.
2 Have the CO tester transmit a T1 test signal into the HLU-200 List 1D and verify that the returned
(looped) signal is error free.
3 If the above test fails, have the CO tester transmit the (3-in-5) inband loop-down code.
4 Have the CO tester send the HLU-200 List 1D (4-in-7) inband loop-up for five seconds. Observe
that a NLOC HLU-200 List 1D loopback is in effect. The loopback state is indicated by the GREEN
LOOP LED on the front panel and is also displayed in 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.
6 The HLU-200 List 1D can be looped-up from the remote location (CREM) by issuing the (6-in-7)
command at the HRU-412 DS1 input port.
7 The HRU-412 can be looped-up from the remote location (CLOC) by issuing the (5-in-7) command
at the HRU-412 DS1 input port.
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Action
November 22, 1996
150-200-114-03, Issue 03
HLU-200 List 1D