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150-451-103-02, Revision 02 Installation
HDU-451 List 3 September 18, 1998 13
If the HDU-451 loses power, the HLU at the central is not present. Measure
the resistance of the HDSL input loop. Resistance should be normal loop
resistance plus the 25-Ohm signature of the HLU.
Line Unit Status Menu Messages
Table 5 shows the messages that can appear on the line unit four-character
front panel display.
Table 5. HLU-451 Status Menu Messages
Message Full Name Description
ALARMS
NONE No Alarms
LLOS Local Loss of Signal No signal from local T1 interface.
RLOS Remote Loss of Signal No signal from remote T1 interface.
MNR Minor Alarm A Minor Alarm condition is in effect.
LOSW Loss of Sync Word One of the HDSL loops has lost synchronization.
H1ES HDSL Loop 1 Errored
Second Loop 1’s CRC has exceeded the user-selected
Errored Seconds threshold.
H2ES HDSL Loop 2 Errored
Second Loop 2’s CRC has exceeded the user-selected
Errored Seconds threshold.
DS1 Digital Service 1 DS1 input BPVs have exceeded the
user-selected Errored Seconds threshold.
ACO Alarm Cut Off An Alarm Cut Off is in effect.
LAIS Local Alarm Indicating
Signal Indicates an AIS (all 1s) pattern is being
transmitted from the local T1 output port.
RAIS Remote AIS Indicates an AIS (all 1s) pattern is being
transmitted from the local T1 output port.
HDSL-1(2) HDSL Loop 1(2) Defines HDSL loop 1(2) in any given span.
MAL 1(2) Margin Alarm 1 (2) The Margin on HDSL loop 1 (2) has dropped
below the threshold (1 to 15) set by the user.