Testing; Front-Panel System Alarms - ADC HiGain H2TU-C-388 List 1E User Manual

152-388-115-03, Issue 03
T
ESTING
This section provides information about front-panel system alarms, LOS/AIS response, OCT55 test procedure,
and loopback testing.
F -P S
RONT ANEL
Table 20 on page 43 lists H2TU-C-388 alarm states in order of priority as they appear on the front panel. These
alarms correlate with the alarms displayed on the alarm history screens, detailed in
the DS1 Interface" on page
More than one alarm condition can exist at any given time, but only one message can be displayed on the front
panel. For multiple alarms, only the highest priority alarm displays.
Front-Panel
Alarm
(a)
Message
(b)
POWER FEED SHRT Short
(b)
POWER FEED GND Ground
(b)
POWER FEED OPEN Open
(b)
LOSW Loss of Sync Word
MTA Metallic Test Access
SPTE Split Equipment
SPTF Split Facilities
(b)
LLOS Local Loss of Signal
(b)
RLOS Remote Loss of Signal
LAIS Local Alarm Indication
Signal
RAIS Alarm Indication Signal
at the H2TU-R
RRAI Remote Alarm
Indication
LRAI Line RAI
TRCI Remote Alarm
Indication - Customer
Installation
(b)
MAL Margin Alarm
(b)
LA Loop Attenuation
DBER DS1 Bit Error Rate
(b)
HBER HDSL2 Block Error
Rate
H2TU-C-388 List 1E
A
YSTEM LARMS
36, however, the screens provide a more detailed analysis.
Table 20. 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.
(c)
The HDSL2 loop has lost synchronization.
The H2TU-C is in its MTA/LOSW test state.
A test mode initiated by the HMU which splits
the AUX port's DSX-1 payload and sends it to
the MUX port.
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.
Loss of the DSX-1 input signal.
Loss of the H2TU-R DS1 input signal.
Indicates an AIS (all ones) pattern is being
transmitted from the local DS1 output port.
Indicates an AIS (all ones) pattern is being
received at the H2TU-R DS1 input port.
Remote Alarm Indication at the H2TU-R -
Indicates an RAI alarm (yellow) from the CPE
with errors from the line unit or network.
Indicates an RAI alarm (yellow) from the CPE
with an error-free signal from the line unit or
network.
Upon reception of an RAI (yellow alarm) 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.
The margin on the HDSL2 loop has dropped below
the minimum threshold value set for the system.
The attenuation on the HDSL2 loop has
exceeded the maximum value set for the HDSL2
loop attenuation threshold.
The DS1 BER has exceeded the set 24-hour
threshold limit of approximately 10
The HDSL2 BER has exceeded the set threshold
limits of 10
April 21, 2000
-6
.
-6 - 7
or 10 .

Testing

"Current Statistics Screens for
To Inhibit:
Cannot be inhibited.
Cannot be inhibited.
Cannot be inhibited.
Cannot be inhibited.
Sets MTA option to disabled.
Sets ADS1 option to MUX or
CTHR.
Sets ADS1 option to MUX or
CTHR.
Cannot be inhibited.
Cannot be inhibited.
Cannot be inhibited.
Cannot be inhibited.
Cannot be inhibited.
Cannot be inhibited.
Cannot be inhibited.
Set the Margin Alarm
Threshold option to 0 (zero).
Set the HDSL2 Loop
Attenuation Threshold
option to zero.
Select DIS for the DBER
system option.
Select NONE for the HBER
system option.
43