ADC H2TU-C-319 List 4E Manual Do Utilizador
LTPH-UM-1049-02, Issue 2
Testing
H2TU-C-319 List 4E
January 9, 2002
59
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.
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.
IN
-
BAND
L
OOPBACK
S
ESSIONS
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.
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
. All equalizers
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
shown in
. Connecting one cable between the two bridging jacks and another between the two
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.
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.
GNLB Test Procedures
GNLB commands shown.
for a description of these commands.
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.
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.
to the test set is error-free.
3
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.
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
. If the test passes, the problem is in the downstream direction. If it fails, the problem is in the
upstream direction.
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.
or AUX. The unselected port defaults to an equalizer setting of zero.