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Testing LTPH-UM-1109-01, Issue 1
40 January 9, 2002 H2TU-C-231 List 2
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
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
(c)
Loss of Sync Word
(d)
The HDSL2 loop has lost synchronization. Cannot be inhibited.
LLOS
(c)
Line (Unit) Loss of
Signal
Loss of the DSX-1 input signal. Cannot be inhibited.
RLOS
(c)
Remote (Unit) Loss of
Signal
Loss of the H2TU-R DS1 input 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
Signal
Indicates an AIS (unframed all ones)
pattern is being received at the H2TU-C
DS1 input port.
Cannot be inhibited.
RAIS Remote Alarm
Indication Signal
Indicates an AIS (unframed all ones)
pattern is being received at the H2TU-R
DS1 input port.
Cannot be inhibited.
LRAI Line RAI—Remote
Alarm Indication at the
H2TU-R (Net signal
does not have errors.)
Indicates an RAI alarm (yellow) from the
CPE with an error-free signal from the line
unit or network. RAI signal is transmitted
towards the network.
Cannot be inhibited.
RRAI Remote RAI—Remote
Alarm Indication at the
H2TU-R (Net signal has
errors.)
Indicates an RAI alarm (yellow) from the
CPE with errors from the line unit or
network.
Cannot be inhibited.
Continued