Gnlb Test Procedures - ADC HiGain H2TU-C-202 Manual

Testing
The transmit and receive DSX-1 ports have splitting access jacks and miniature 210-series, bridging jacks as
shown in Figure 2 on page
LINE jacks splits the IN and OUT and creates metallic loopbacks towards both the DSX-1 and the H2TU-C-202.
If separate plugs are inserted into both LINE jacks with the other end disconnected, the BRG jacks can be used to
send and receive test patterns towards the DSX-1.

GNLB Test Procedures

Figure 30 provides a graphical representation of the various loopback configurations with the associated GNLB
commands shown. Also, refer to
To perform the GNLB loopback test procedure:
1 Have the CO tester send the NREM (3-in-7) inband loopup code for 5 seconds. The Status LED on the front
panel should be green and the loopback mode should also be identified on the Monitor screen.
2 Have the CO tester transmit a DS1 test signal towards the H2TU-C and verify that the signal returned (looped)
to the test set is error-free.
3 If step 2 fails, have the CO tester transmit the (3-in-5) inband loopdown code.
4 Have the CO tester send the NLOC (4-in-7) inband loopup for 5 seconds. The LBK LED on the front panel
should be a steady yellow, and the loopback mode should also be identified on the Monitor 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.
48
4. Connecting one cable between the two bridging jacks and another between the two
Table 22 on page 46
February 28, 2001
for a description of these commands.
LTPH-TP-1005-02, Issue 2
H2TU-C-202 List 3E