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Testing LTPH-UM-1049-02, Issue 2
52 January 9, 2002 H2TU-C-319 List 4E
TESTING
This section provides information about front-panel system alarms, LOS and AIS response, OCT55 test
procedure, and loopback testing.
SYSTEM ALARMS
Table 21 summarizes all possible 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 44). All alarms that are not inhibited will drive the front-panel Status LED to a flashing red alarm state.
Table 21. Front-Panel System Alarms Summary
Front-Panel
Message
(a)
Alarm Description To Inhibit:
PWR FEED SHRT
(b)
Power Feed Short A short exists between the Tip and Ring of the
HDSL2 pair.
Cannot be inhibited.
PWR FEED GND
(b)
Power Feed Ground The HDSL2 loop is grounded. Cannot be inhibited.
PWR FEED OPEN
(b)
Power Feed Open A line power open condition exists. Cannot be inhibited.
LOSW
(b)
Loss of Sync Word
(c)
The HDSL2 loop has lost synchronization. Cannot be inhibited.
MTA Metallic Test Access The H2TU-C is in its MTA/LOSW test state. Sets MTA option to disabled.
SPTE Split Equipment A test mode initiated by the HMU which splits the
AUX port’s DSX-1 payload and sends it to the MUX
port.
Sets ADS1 option to MUX or
CTHR.
SPTF Split Facilities A test mode initiated by the HMU which splits the
facility DS1 payload from the AUX port #1 and sends
it to the MUX port.
Sets ADS1 option to MUX or
CTHR.
LLOS
(b)
Local Loss of Signal Loss of the DSX-1 input signal. Cannot be inhibited.
RLOS
(b)
Remote Loss of Signal Loss of the H2TU-R DS1 input signal. Cannot be inhibited.
LAIS Local Alarm Indication
Signal
Indicates an AIS (all ones) pattern is being received
at the H2TU-C input port.
Cannot be inhibited.
RAIS Alarm Indication Signal
at the H2TU-R
Indicates an AIS (all ones) pattern is being received
at the H2TU-R DS1 input port.
Cannot be inhibited.
RRAI Remote Alarm
Indication
Remote Alarm Indication at the H2TU-R Indicates an
RAI alarm (yellow LED) from the CPE with errors
from the line unit or network.
Cannot be inhibited.
LRAI Remote Alarm
Indicator - Customer
Installation
Indicates an RAI alarm (yellow LED) from the CPE
with an error-free signal from the line unit or
network.
Cannot be inhibited.
TRCI Remote Alarm
Indication - Customer
Installation
Upon reception of an RAI (yellow LED) 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.
Cannot be inhibited.
xxx-DBER DS1 Bit Error Rate The DS1 BER has exceeded the set 24-hour
threshold limit of approximately 10
-6
. (xxx denotes
either TUC or TUR. If TUC and TUR occur at the
same time, then TUC displays.)
Select DIS for the DBER
system option.
PRMF Performance Report
Messaging - Far End
Indicates H2TU-R PRM-FE BER threshold is
exceeded.
Set DBER threshold to DIS.
PRMN Performance Report
Messaging - Near End
Indicates H2TU-R PRM-NE BER threshold is
exceeded.
Set DBER threshold to DIS.
Continued