Testing; System Alarms - ADC HiGain H2TU-C-231 User Manual

Adc h2tu-c-231 list 2 line unit
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Testing

T
ESTING
This section provides information about front-panel system alarms, LOS and AIS response, OCT55 test
procedure, and loopback testing.
S
A
YSTEM
LARMS
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
on page
32. 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
(c)
LOSW
Loss of Sync Word
(c)
LLOS
Line (Unit) Loss of
Signal
(c)
RLOS
Remote (Unit) Loss of
Signal
LAIS
Line Alarm Indication
Signal
RAIS
Remote Alarm
Indication Signal
LRAI
Line RAI—Remote
Alarm Indication at the
H2TU-R (Net signal
does not have errors.)
RRAI
Remote RAI—Remote
Alarm Indication at the
H2TU-R (Net signal has
errors.)
40
Table 15.
Front-Panel 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.
(d)
The HDSL2 loop has lost synchronization.
Loss of the DSX-1 input signal.
Loss of the H2TU-R DS1 input signal.
Indicates an AIS (unframed all ones)
pattern is being received at the H2TU-C
DS1 input port.
Indicates an AIS (unframed all ones)
pattern is being received at the H2TU-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.
January 9, 2002
"Using the Performance Screens to View Alarm Data"
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.
LTPH-UM-1109-01, Issue 1
Continued
H2TU-C-231 List 2

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