Testing

LTPH-UM-1109-01, Issue 1

 

 

TESTING

This section provides information about front-panel system alarms, LOS and AIS response, OCT55 test procedure, and loopback testing.

SYSTEM ALARMS

Table 15 summarizes all possible HDSL2 system alarms in order of priority as they appear on the front panel. When multiple alarms occur, the front-panel display only reports the highest priority alarm. The alarm history screens display alarms also, but provide greater detail. See “Using the Performance Screens to View Alarm Data” on page 32. Alarms that are not inhibited will drive the front-panel Status LED to a flashing red alarm state.

Table 15. Front-Panel System Alarms Summary

Front-Panel

Alarm

Description

To Inhibit

Message (a)

PWR FEED

Power Feed Short

A short exists between the Tip and Ring of

Cannot be inhibited.

SHRT (b)

 

the HDSL2 pair.

 

PWR FEED

Power Feed Ground

The HDSL2 loop is grounded.

Cannot be inhibited.

GND (b)

 

 

 

PWR FEED

Power Feed Open

A line power open condition exists.

Cannot be inhibited.

OPEN (b)

 

 

 

LOSW (c)

Loss of Sync Word (d)

The HDSL2 loop has lost synchronization.

Cannot be inhibited.

LLOS (c)

Line (Unit) Loss of

Loss of the DSX-1 input signal.

Cannot be inhibited.

 

Signal

 

 

RLOS (c)

Remote (Unit) Loss of Loss of the H2TU-R DS1 input signal.

 

Signal

Disable the RDA (Remote Disconnect Alarm) option. The front-panel Status LED still flashes red and the ALRM RLOS message displays to alert you of the LOS state. LOS is sent towards the network from the H2TU-C. This option prevents the common occurrences of a CPE LOS condition from generating recurring alarms and AIS payloads.

LAIS

Line Alarm Indication

Indicates an AIS (unframed all ones)

Cannot be inhibited.

 

Signal

pattern is being received at the H2TU-C

 

 

 

DS1 input port.

 

 

 

 

 

RAIS

Remote Alarm

Indicates an AIS (unframed all ones)

Cannot be inhibited.

 

Indication Signal

pattern is being received at the H2TU-R

 

 

 

DS1 input port.

 

 

 

 

 

LRAI

Line RAI—Remote

Indicates an RAI alarm (yellow) from the

Cannot be inhibited.

 

Alarm Indication at the

CPE with an error-free signal from the line

 

 

H2TU-R (Net signal

unit or network. RAI signal is transmitted

 

 

does not have errors.)

towards the network.

 

 

 

 

 

RRAI

Remote RAI—Remote

Indicates an RAI alarm (yellow) from the

Cannot be inhibited.

 

Alarm Indication at the

CPE with errors from the line unit or

 

 

H2TU-R (Net signal has

network.

 

 

errors.)

 

 

Continued

40

January 9, 2002

H2TU-C-231 List 2