Issue 1, Section 150-231-164
Revision 04
Page 47
5.09
Figure 31 through Figure 33 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 & MARGIN are span
specific alarms. The PWR-OPEN and PWR-SHRT
alarms indicate alarm conditions on the HLU-231 List.
Neither PWR alarm is available on the other spans. In
Figure 31 through Figure 33, the “First” & “Last” columns
contain the time & date stamp of the first & 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 that occurred on the two HDSL loops between
the HLU-231 List 6D and the first Doubler (HDU1). The
SPAN 2 Screen refers to the loops between the first
Doubler (HDU1) and the HRU-412 for one-Doubler
circuits or between the first and second Doublers (HDU1
& 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. HLU-231 LIST 6D STATUS MENU MESSAGES
Message
Full Name
Description
ALARMS:
NONE
No Alarms
LLOS
Local Loss of Signal
No signal from HLU-231 List 6D local T1 interface.
RLOS
Remote Loss of Signal
No signal from HRU-412 remote T1 interface.
LOSW1(2)
Loss of Sync Word 1(2)
HDSL loop 1 or 2 has lost sync.
H1ES
HDSL Loop 1 Errored Second
Loop 1 CRC have exceeded the ES threshold.
H2ES
HDSL Loop 2 Errored Second
Loop 2 CRC have exceeded the ES threshold.
DS1
Digital Service 1
BPVs for either the HLU-231 List 6D or HRU-412 DS1 input
have exceeded the user selected ES threshold.
R(L)AIS
Remote (Local) Alarm
Indicating Signal
Indicates an AIS (all “1”) pattern is being transmitted from the
remote (local) T1 output port.
MAL1
Margin Alarm 1
The margin on HDSL loop 1 has dropped below the threshold (1
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 (1
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.
Table continued on next page
