ADC H2TU-C-388 HiGain, User Manual

Page: 51 / 76

152-388-115-03, Issue 03 Testing
H2TU-C-388 List 1E April 21, 2000 43
T
ESTING
This section provides information about front-panel system alarms, LOS/AIS response, OCT55 test procedure,
and loopback testing.
F
RONT
-P
ANEL
S
YSTEM
A
LARMS
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 “Current Statistics Screens for
the DS1 Interface” on page 36 , however, the screens provide a more detailed analysis.
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.
Table 20. Front-Panel System Alarms Summary
Front-Panel
Message
(a)
Alarm Description To Inhibit:
POWER FEED SHRT
(b)
Short A short exists between the Tip and Ring of the
HDSL2 pair. Cannot be inhibited.
POWER FEED GND
(b)
Ground The HDSL2 loop is grounded. Cannot be inhibited.
POWER FEED OPEN
(b)
Open A line power open condition exists. Cannot be inhibited.
LOSW
(b)
Loss of Sync Word
(c)
The HDSL2 loop has lost synchronization. Cannot be inhibited.
MTA Metallic Test Access The H2TU-C is in its MTA/LOSW test state. Sets MTA option to disabled.
SPTE Split Equipment A test mode initiated by the HMU which splits
the AUX port’s DSX-1 payload and sends it to
the MUX port. Sets ADS1 option to MUX or
CTHR.
SPTF Split Facilities 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. Sets ADS1 option to MUX or
CTHR.
LLOS
(b)
Local Loss of Signal Loss of the DSX-1 input signal. Cannot be inhibited.
RLOS
(b)
Remote Loss of Signal Loss of the H2TU-R DS1 input signal. Cannot be inhibited.
LAIS Local Alarm Indication
Signal Indicates an AIS (all ones) pattern is being
transmitted from the local DS1 output port. Cannot be inhibited.
RAIS Alarm Indication Signal
at the H2TU-R Indicates an AIS (all ones) pattern is being
received at the H2TU-R DS1 input port. Cannot be inhibited.
RRAI Remote Alarm
Indication Remote Alarm Indication at the H2TU-R -
Indicates an RAI alarm (yellow) from the CPE
with errors from the line unit or network. Cannot be inhibited.
LRAI Line RAI Indicates an RAI alarm (yellow) from the CPE
with an error-free signal from the line unit or
network. Cannot be inhibited.
TRCI Remote Alarm
Indication - Customer
Installation 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. Cannot be inhibited.
MAL
(b)
Margin Alarm The margin on the HDSL2 loop has dropped below
the minimum threshold value set for the system. Set the Margin Alarm
Threshold option to 0 (zero).
LA
(b)
Loop Attenuation The attenuation on the HDSL2 loop has
exceeded the maximum value set for the HDSL2
loop attenuation threshold. Set the HDSL2 Loop
Attenuation Threshold
option to zero.
DBER DS1 Bit Error Rate The DS1 BER has exceeded the set 24-hour
threshold limit of approximately 10
-6
.
Select DIS for the DBER
system option.
HBER
(b)
HDSL2 Block Error
Rate The HDSL2 BER has exceeded the set threshold
limits of 10
-6
or 10
- 7
.
Select NONE for the HBER
system option.