Testing; System Alarms - ADC H4TU-C-388-L1 User Manual

LTPH-UM-1122-02, Issue 2
T
ESTING
This section provides information about front-panel system alarms, LOS and AIS response, the OCT55 test
procedure, and loopback testing.
S A
YSTEM LARMS
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
on page 28). Alarms that are not inhibited will drive the front-panel Status LED to a flashing red alarm state.
Front-Panel
Alarm
(a)
Message
PWR FEED Power Feed Short
(b)
SHRT
PWR FEED Power Feed Ground
(b)
GND
PWR FEED Power Feed Open
(b)
OPEN
SPNn-LOSW Span(n)-Loss of Sync
(c)
Word
LLOS Line (Unit) Loss of
Signal
RLOS Remote (Unit) Loss of
Signal
LAIS Line Alarm Indication
Signal
RAIS Remote Alarm
Indication Signal
LRAI Line RAI—Remote
Alarm Indication at the
H4TU-R (Net signal
does not have errors.)
RRAI Remote RAI—Remote
Alarm Indication at the
H4TU-R (Net signal
has errors.)
H4TU-C-388 List 1
"Using the Performance Screens to View Performance Data"
Table 15. Front-Panel System Alarms
Description
A short exists between the Loop 1 and Loop 2
of the HDSL4 pair.
One of the HDSL4 loops is grounded.
A line power open condition exists.
The HDSL4 loop has lost synchronization.
The span closest to the network has highest
priority.
Loss of the DSX-1 input signal.
Loss of the H4TU-R DS1 input signal.
Indicates an AIS (unframed all ones) pattern
is being received at the H4TU-C DS1 input
port.
Indicates an AIS (unframed all ones) pattern
is being received at the H4TU-R DS1 input
port.
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.
Indicates an RAI alarm (yellow) from the CPE
with errors from the line unit or network.
September 12, 2003
To Inhibit:
Cannot be inhibited.
Cannot be inhibited.
Cannot be inhibited.
Cannot be inhibited.
Cannot be inhibited.
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.
Cannot be inhibited.
Cannot be inhibited.
Cannot be inhibited.
Cannot be inhibited.

Testing

Continued
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