Manual Loopback Session; Setting The Loopback Time-Out Option (Lbto Switch); Loopback Test Procedures; General Troubleshooting Tips - ADC HiGain H2TU-C-202 User Manual

Testing

Manual Loopback Session

A manual loopback session allows you to select any one of the HiGain HDSL2 loopbacks listed in
page 44 with the exception of SmartJack loopbacks, which can only be issued by inband commands.

Setting the Loopback Time-out Option (LBTO Switch)

Before initiating a loopback session, verify that the Loopback Time-out parameter is set to the desired setting.
1 Use the Loopback Time-out parameter from the switch when using a maintenance terminal.
2 Select the desired setting:
• NONE (time-out disabled)
• 120 minutes (default setting)
All loopbacks can be initiated by inband commands in the T1 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 HDSL2) 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.
46
P
ROCEDURES
April 21, 2000
152-202-115-04, Revision 04
Table 6 on page 18. All equalizers should
H2TU-C-202 List 1E
Table 21 on