Testing; System Alarms; Front-Panel System Alarms Summary - ADC HiGain H2TU-C-231 List 3F User Manual

Testing

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 system alarms in order of priority as they appear on the line unit front panel.
When multiple alarms occur, the front-panel display only reports the highest priority alarm. Additionally, the
alarm history screens display alarms, but provide greater detail (see
Alarm Data" on page
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)
SPNn-LOSW Span(n)-Loss of Sync Word The HDSL2 loop has lost synchronization.
LLOS Line (Unit) Loss of Signal
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
xxx-HBER HDSL2 Block Error Rate
48
37). All alarms that are not inhibited flash red on the front-panel Status LED.
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.
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) 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
limits of 10
TUR. If TUC and TUR occur at the same time,
then TUC displays.
"Using the Performance Screens to View
-6
. xxx denotes either
-6 - 7
or 10 . xxx denotes either TUC or
June 12, 2002
LTPH-UM-1149-01
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
H2TU-C-231 List 3F