In-Band Loopback Sessions; General Troubleshooting Tips; Gnlb Test Procedures - ADC HiGain H2TU-C-319 List 4E User Manual

Adc higain h2tu-c-319 list 4e line unit user manual
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LTPH-UM-1049-02, Issue 2
You can also manually terminate the MTA state and exit the MAN LPBK mode by simultaneously pressing the
MODE and LBK pushbuttons for 3 or more seconds. If no loopback or MTA is active, the MAN LPBK mode
automatically terminates after 30 seconds.
-
L
IN
BAND
OOPBACK
The following sections provide step-by-step test procedures for verifying the integrity of the HDSL2 channels at
every module location as well as the DS1 channels to the customer and the local DSX-1 interface.

General Troubleshooting Tips

If trouble is encountered on the DSX-1 interfaces of the H2TU-C, verify that the:
H2TU-C is making a positive connection with its shelf connector.
H2TU-C internal equalizer is set to the correct distance range, as shown in
should be set to the distance from the DSX-1 to the shelf.
The transmit and receive DSX-1 ports have splitting access jacks and miniature, 210-series, bridging jacks as
shown in
Figure 1 on page
LINE jacks splits the IN and OUT and creates metallic loopbacks toward both the DSX-1 and the H2TU-C. 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 toward the DSX-1. The AUX DSX-1 port has no resident test jack access.
The equalizer settings only apply to the specific DSX-1 port selected by the ADS1 option, MUX
or AUX. The unselected port defaults to an equalizer setting of zero.

GNLB Test Procedures

Figure 32 on page 60
GNLB commands shown.
To perform the GNLB loopback test procedure:
1
Have the CO tester send the NREM (3-in-7) in-band loopup code for 5 seconds. You should be able to observe
the NREM message on the front-panel display. 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 toward the H2TU-C and verify that the returned (looped) signal
to the test set is error-free.
3
If
Step 2
fails, have the CO tester transmit the (3-in-5) in-band loopdown code.
4
Have the CO tester send the NLOC (4-in-7) in-band 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 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.
H2TU-C-319 List 4E
S
ESSIONS
3. Connecting one cable between the two bridging jacks and another between the two
is a graphical representation of the various loopback configurations with the associated
Table 22 on page 56
for a description of these commands.
January 9, 2002
Table 5 on page
18. All equalizers
Testing
59

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