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Testing LTPH-UM-1031-03, Issue 3
42 September 12, 2003 H4TU-C-319 List 1
TESTING
This section provides information about front-panel system alarms, LOS and AIS response, the OCT55 test
procedure, and loopback testing.
SYSTEM ALARMS
Table 15 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 Performance Data”
on page 28). Alarms that are not inhibited will drive the front-panel Status LED to a flashing red alarm state.
Table 15. Front-Panel System Alarms
Front-Panel
Message
(a)
Alarm Description To Inhibit:
PWR FEED
SHRT
(b)
Power Feed Short A short exists between Loop 1 and Loop 2 of
the HDSL4 pair.
Cannot be inhibited.
PWR FEED
GND
(b)
Power Feed Ground One of the HDSL4 loops is grounded. Cannot be inhibited.
PWR FEED
OPEN
(b)
Power Feed Open A line power open condition exists. Cannot be inhibited.
SPNn-LOSW Span(n)-Loss of Sync
Word
(c)
The HDSL4 loop has lost synchronization.
The span closest to the network has highest
priority.
Cannot be inhibited.
LLOS Line (Unit) Loss of
Signal
Loss of the DSX-1 input signal. Cannot be inhibited.
RLOS Remote (Unit) Loss of
Signal
Loss of the H4TU-R DS1 input signal. Disable the RDA (Remote Disconnect
Alarm) option. This prevents an LOS
condition at the DS1 input to a H4TU-R
from activating pin H. 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 H4TU-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 H4TU-C DS1 input
port.
Cannot be inhibited.
RAIS Remote Alarm
Indication Signal
Indicates an AIS (unframed all ones) pattern
is being received at the H4TU-R DS1 input
port.
Cannot be inhibited.
LRAI Line RAI—Remote
Alarm Indication at the
H4TU-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.
Continued