Section 150-431-114
Release 01
Page 51
21.09
Figure 32 through Figure 34 show the Alarm
History screens for doubler applications. The
alarms are defined in Section A Paragraph 4.01. The LOS
and PWR system alarms are common to all spans. Only
the LOSW, ES and Margin are span-specific alarms. The
PWR-OPEN and PWR-SHRT alarms indicate alarm
conditions on the HLU-431. Neither PWR alarm is
available on the other spans. In Figure 32 through Figure
34, the “First” and “Last” columns contain the time and
date stamp of the first and last occurrence of each alarm.
The “Current” column shows the status of each alarm.
The “Count” column lists the number of times each alarm
occurred. All the data can be cleared by pressing C
(Clear). The maximum non-overflowing count is 999.
The Span 1 screen concerns alarms which occurred on the
two HDSL loops between the HLU-431, List 1D and the
first doubler (HDU1). The Span 2 screen refers either to
the loops between the first doubler (HDU1) and the HRU-
412, for one-doubler circuits, or, to the loops between the
first and second doublers (HDU1 and HDU2), for two-
doubler circuits. The Span 3 screen refers to the loops
between the second doubler and the HRU-412, for two-
doubler circuits. Table 19 shows a glossary of HiGain
Terms. Table 20 shows the HLU-431, List 1D Four-
Character Front Panel messages.
TABLE 18. HLU-431, LIST 1D STATUS MENU MESSAGES
Message
Full Name
Description
ALARMS:
NONE
No Alarms
“None” indicates no alarms.
LLOS
Local Loss of Signal
No signal from HLU-431, List 1D local DSX-1 interface.
RLOS
Remote Loss of Signal
No signal from HRU-412 remote DS1 interface.
LOSW1
Loss of Sync Word 1
HDSL loop 1 has lost sync.
LOSW2
Loss of Sync Word 2
HDSL loop 2 has lost sync.
H1ES
HDSL Loop 1 Errored Second
Loop 1 CRCs have exceeded the user-selected ES threshold.
H2ES
HDSL Loop 2 Errored Second
Loop 2 CRC have exceeded the user-selected ES threshold.
DS1
Digital Service 1
T1 input BPVs, at either the HLU-431, List 1D or HRU-412, have
exceeded the user-selected ES threshold.
RAIS
Remote Alarm Indicating Signal
Indicates an AIS (all “1”) pattern is being transmitted from the remote
T1 output port.
LAIS
Local Alarm Indicating Signal
Indicates an AIS (all “1”) pattern is being transmitted from the local
T1 output port.
MAL1
Margin Alarm 1
The margin on HDSL loop 1 has dropped below the threshold (0 to 15 dB)
set by the user. Setting the threshold to 0 inhibits the margin alarm.
MAL2
Margin Alarm 2
The margin on HDSL loop 2 has dropped below the threshold (0 to 15 dB)
set by the user. Setting the threshold to 0 inhibits the margin alarm.
CHREV
Channels Reversed
The loop 1 and loop 2 HDSL pairs are reversed at the HDU-451 or HRU-412
line input ports. Loop 1 is specified to carry the (-) simplex DC voltage, and
loop 2 is specified to carry (+) simplex DC voltage.
ACO
Alarm CutOff
A minor alarm occurred and was retired to an ACO condition after pressing
the SEL button on the HLU front panel.
Table continued on next page
