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Monitoring System Activity and Performance LTPH-UM-1109-01, Issue 1
34 January 9, 2002 H2TU-C-231 List 2
Table 11. DS1 Alarm Descriptions
Screen
Alarm
Front-Panel
Alarm
Description
H2TU-C DS1 ALARMS (see Figure 21 on page 33)
LLOS
(a)
(a) Issues a minor alarm (sent to the management unit or the backplane), if enabled.
LLOS Line (Unit) Loss of Signal—Loss of the H2TU-C DSX-1 input signal.
LAIS
(a)
LAIS Line Alarm Indication Signal—Indicates an AIS (unframed all ones) pattern is being received at the
H2TU-C DS1 input port.
DBER xxx-DBER Bit Error Rate—The DS1 BER has exceeded the built-in 24-hour threshold limits of approximately
10
-6
. (xxx denotes either TUC or TUR.)
LOF LOF Loss of Frame—Indicates the incoming DS1 payload does not contain the specific frame pattern,
ESF or SF, selected by the FRMG option. Only occurs if the FRMG option is set to SF or ESF.
H2TU-R DS1 ALARMS (see Figure 22 on page 33)
RLOS
(b)
(b) AIS-CI is a modified AIS alarm pattern. Equipment not suited to detect AIS-CI still detects this signal as an AIS. AIS-CI is sent
toward the network indicating that an LOS (RLOS) or AIS (RAIS) has been received from the CPE.
RLOS Remote (Unit) Loss of Signal—Loss of the H2TU-R DS1 input signal.
RAIS RAIS Remote Alarm Indication Signal—Indicates an AIS (unframed all ones) pattern is being received at
the H2TU-R DS1 input port. By default (see Figure 26 on page 42) AIS-CI
(b)
is sent towards the
network.
RAI RRAI Remote RAI - Remote Alarm Indication at the H2TU-R—Indicates an RAI alarm (yellow) from the
CPE with errors from the line unit or network.
LRAI LRAI Line (Unit) RAI - Remote Alarm Indication at the H2TU-R—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.
PRM-NE PRMN Performance Report Messaging - Near End—The count of the PRM-NE register at the H2TU-R
exceeds the 10
-6
BER threshold at 648 events since 12:00:00 AM.
PRM-FE PRMF Performance Report Messaging - Far End—The count of the PRM-FE register at the H2TU-R exceeds
the 10
-6
BER threshold at 648 events since 12:00:00 AM.
DBER xxx-DBER Bit Error Rate—The DS1 BER has exceeded the built-in 24-hour threshold limits of approximately
10
-6
. (xxx denotes either TUC or TUR.)
LOF LOF Loss of Frame—Indicates the incoming DS1 payload does not contain the specific frame pattern,
ESF or SF, selected by the FRMG option. Only occurs if the FRMG option is set to SF or ESF.