Testing; System Alarms; Front-Panel System Alarms Summary - ADC H2TU-C-202 User Manual

LTPH-UM-1072-03
T
ESTING
This section provides information about front-panel system alarms, LOS and AIS response, OCT55 test
procedure, and loopback testing.
S A
YSTEM LARMS
Table 21 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
on page 39. Alarms that are not inhibited will drive the front-panel Status LED to a flashing red alarm state.
Front-Panel
Alarm
(a)
Message
(b)
PWR FEED SHRT Power Feed Short
(b)
PWR FEED GND Power Feed Ground
(b)
PWR FEED OPEN Power Feed Open
(c)
LOSW Loss of Sync Word
(c)
LLOS Line (Unit) Loss of Signal
(c)
RLOS Remote (Unit) Loss of
Signal
LAIS Line Alarm Indication Signal Indicates an AIS (unframed all ones) pattern is
RAIS Remote Alarm Indication
Signal
TRCI Transmit RAI-CI—Remote
Alarm Indication at the
H2TU-R
RRAI Remote RAI—Remote
Alarm Indication at the
H2TU-R
xxx-DBER DS1 Bit Error Rate
PRMF Performance Report
Messaging - Far End
PRMN Performance Report
Messaging - Near End
(c)
xxx-HBER HDSL2 Block Error Rate
H2TU-C-202 List 2F
Table 21.

Front-Panel System Alarms Summary

Description
A short exists between the Tip and Ring of the
HDSL2 pair.
The HDSL2 loop is grounded.
A line power open condition exists.
The HDSL2 loop has lost synchronization.
Loss of the DSX-1 input signal.
Loss of the H2TU-R DS1 input signal.
being received at the H2TU-C DS1 input port.
Indicates an AIS (unframed all ones) pattern is
being received at the H2TU-R DS1 input port.
Upon reception of an RAI (yellow alarm) from
the CPE, the H2TU-R sends RAI-CI toward the
network if the network signal received at the
H2TU-R is clear.
If the network signal is impaired (LOS, AIS, or
LOF), then the RAI is passed on to the network
unaltered.
Indicates an RAI alarm (yellow) from the CPE
with errors from the line unit or network.
The DS1 BER has exceeded the set threshold
limits of approximately 10
TUC or TUR. If TUC and TUR occur at the same
time, then TUC displays.
Indicates H2TU-R PRM-FE BER threshold is
exceeded.
Indicates H2TU-R PRM-NE BER threshold is
exceeded.
The HDSL2 BER has exceeded the set threshold
-6
limits of 10
TUR. If TUC and TUR occur at the same time,
then TUC displays.
October 25, 2002
"Using the Performance Screens to View Alarm Data"
-6
. xxx denotes either
- 7
or 10 . xxx denotes either TUC or

Testing

To Inhibit
Cannot be inhibited.
Cannot be inhibited.
Cannot be inhibited.
Cannot be inhibited.
Cannot be inhibited.
Cannot be inhibited.
Cannot be inhibited.
Cannot be inhibited.
Cannot be inhibited.
Cannot be inhibited.
Select DIS for the DBER
system option.
Set DBER threshold to
DIS.
Set DBER threshold to
DIS.
Select NONE for the HBER
system option.
Continued
49