ADC HiGain H2TU-C-231 Manual page 46

Monitoring System Activity and Performance
Screen Alarm Front-Panel Alarm Description
H2TU-C DS1 ALARMS (see Figure 21 on page
(a)
LLOS LLOS
LAIS LAIS
DBER xxx-DBER
H2TU-R DS1 ALARMS (see
(a)
RLOS RLOS
RAIS RAIS
RAI RRAI
TX RAI-CI TRCI
PRM-NE PRMN
PRM-FE PRMF
DBER xxx-DBER
(a) This is a DS1-specific alarm that also issues a minor alarm (sent to the management unit or the backplane), if enabled.
(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.
38
Table 17. DS1 Alarm Descriptions
37)
Line (Unit) Loss of Signal—Loss of the H2TU-C DSX-1 input signal.
Line Alarm Indication Signal—Indicates an AIS (unframed all ones) pattern is being
received at the H2TU-C DS1 input port.
Bit Error Rate—The DS1 BER has exceeded the built-in 24-hour threshold limits of
approximately 10
Figure 22 on page 37)
Remote (Unit) Loss of Signal— Loss of the H2TU-R DS1 input signal.
Remote Alarm Indication Signal—Indicates an AIS (unframed all ones) pattern is being
received at the H2TU-R DS1 input port. By default AIS-CI
(see Figure 26 on page
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.
Transmit RAI-CI - Remote Alarm Indication at the H2TU-R—Upon reception of an RAI
(yellow alarm) from the CPE, the H2TU-R sends an RAI-CI towards 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. This is applicable to SF or
ESF framing. In an all SF environment, RACI must be enabled to convert SF-RAI to
SF-RAI-CI.
Performance Report Monitoring - Near End—The count of the PRM-NE register at the
H2TU-R exceeds the 10
Performance Report Monitoring - Far End—The count of the PRM-FE register at the
H2TU-R exceeds the 10
Bit Error Rate—The DS1 BER has exceeded the built-in 24-hour threshold limits of
approximately 10
September 28, 2001
-6
. (xxx denotes either TUC or TUR.)
46).
-6
BER threshold at 648 events since 12:00:00 AM.
-6
BER threshold at 648 events since 12:00:00 AM.
-6
. (xxx denotes TUR.)
LTPH-TP-1034-01, Issue 1
(b)
is sent towards the network
H2TU-C-231 List 4E