Smartjack Loopback Commands; Manual Loopback Session; Loopback Test Procedures; General Troubleshooting Tips - ADC HiGain H2TU-C-202 Manual

LTPH-TP-1005-02, Issue 2

SmartJack Loopback Commands

The HiGain HDSL2 SmartJack (SMJK) Loopback (LPBK) commands allow you to use inband, out-of-band, and
universal codes to initiate and terminate loopback testing of the HiGain HDLSL2 circuit (see
Procedure" on page 52
M L
ANUAL OOPBACK
A manual loopback session allows you to select any one of the HiGain HDSL2 loopbacks listed in
page 46.
Setting the Loopback Time-out Option
Before initiating a loopback session, verify that the loopback time-out parameter is set to the desired setting.
1 Using a maintenance terminal, open the Config menu, display the Standard Options screen, then set the
Loopback Time-out parameter.
2 Select the desired setting:
• NONE (time-out disabled)
•
20 minutes
•
60 minutes
•
120 minutes (default setting)
All loopbacks can be initiated by inband commands in the DS1 payload or by a command from the HiGain HDSL2
system (maintenance screen selections). Therefore, whenever a loopback is active, the method by which it was
activated is indicated in the Loopback and Status screens by the annotation HG (HiGain) or PL (Payload) adjacent
to the identified loopback. For example, NREM-HG indicates that the loopback was initiated by the HiGain
HDSL2 system.
SMJK loopback commands are only activated by inband commands.
L T
OOPBACK EST
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 interface 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 per
be set to the distance from the DSX-1 to the shelf.
H2TU-C-202 List 3E
for additional information).
S
ESSION
P
ROCEDURES
February 28, 2001
"SmartJack Test
Table 6 on page 17. All equalizers should
Testing
Table 22 on
47