Testing; System Alarms - ADC HiGain H2TU-C-202 User Manual

Testing

T
ESTING
This section provides information about system alarms, LOS/AIS response, the OCT55 test procedure and
loopback testing.
S A
YSTEM LARMS
Table 20 provides a summary of the system alarms displayed on the H2TU-C-202 alarm history screens (see
"Using the Performance Screens to View Alarm Data" on page
Message on
Alarm
Screen
(a)
SHRT Short
(a)
GND Ground
(a)
OPEN Open
(a)
LOSW Loss of Sync Word
(a)
LLOS Local Loss of Signal
(a)
RLOS Remote Loss of Signal Loss of the H2TU-R DS1 input signal.
LAIS Local Alarm Indication
Signal
RAIS Remote Alarm
Indication Signal
RAI Remote RAI—Remote
Alarm Indication at the
H2TU-R
TX RAI-CI Transmit
RAI-CI—Remote
Alarm Indication at the
H2TU-R
(a)
MAL Margin Alarm
(a)
LA Loop Attenuation
DBER DS1 Bit Error Rate
(a)
HBER HDSL2 Block Error
Rate
PRM-FE Performance Report
Messaging - Far End
PRM-NE Performance Report
Messaging - Near End
(a) Only these alarms assert the System Alarm bus on pins 22 and 30 of the card-edge connector (when the ALM option is
enabled).
40
Table 20. 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.
Indicates an AIS (all ones) pattern is being
transmitted from the local DS1 output port.
Indicates an AIS (all ones) pattern is being
received at the H2TU-R DS1 input port.
Indicates an RAI alarm (yellow) from the CPE
with errors from the line unit or network.
Upon reception of an RAI (yellow alarm) from
the CPE, the H2TU-R sends RAI-CI towards 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.
The margin on the HDSL2 loop has dropped
below the minimum threshold value set for the
system.
The attenuation on the HDSL2 loop has
exceeded the maximum value set for the HDSL2
loop attenuation threshold.
The DS1 BER has exceeded the set threshold
-6
limits of approximately 10 .
The HDSL2 BER has exceeded the set threshold
-6 - 7
limits of 10 or 10 .
Indicates H2TU-R PRM-NE BER threshold is
exceeded.
Indicates H2TU-R PRM-NE BER threshold is
exceeded.
April 21, 2000
152-202-115-04, Revision 04
35).
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.
Set the Margin Alarm Threshold option
to 0 (zero).
Set the HDSL2 Loop Attenuation
Threshold option to zero.
Select DIS for the DBER system option.
Select NONE for the HBER system
option.
Set DBER threshold to DIS.
Set DBER threshold to DIS.
H2TU-C-202 List 1E