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Revision 01 Section 350-231-134
HLU-231 List 3D 11
Testing
Minor alarm and diagnostic messages routinely appear on the HLU-231
front-panel four-character display. This display automatically turns on when
power is initially applied to the HLU-231. To conserve power, the display
remains on for only five minutes if neither the MODE or SEL buttons are
pressed. The use of either button activates the four-character display and
restarts the 5-minute power-control timer.
Alarms
Only one alarm can be displayed at a time, so the highest priority alarm is dis-
played if more than one alarm exists. The following table lists the alarms
ordered by priority:
Status Menu Alarm Messages
Message Full Name Description
NONE No Alarms
LLOS Local Loss of Signal No signal from HLU-231 local T1 interface.
RLOS Remote Loss of Signal No signal from HRU remote T1 interface.
MNR Minor Alrm A minor alarm condition is in effect.
LOSW1 or
LOSW2 Loss of Sync Word 1
or 2 HDSL loop 1 or 2 has lost sync.
H1ES or
H2ES HDSL Loop 1 or 2
Errored Second Loop 1 or 2 has incurred a CRC error.
DS1 Digital Service 1 DS1 input BPVs at the HRU have
exceeded the user selected ES threshold.
RAIS Remote Alarm Indicat-
ing Signal Indicates an AIS (all “1”) pattern is being
transmitted from the remote or T1 output
port.
MAL1 or
MAL2 Margin Alarm 1 or 2 The margin on HDSL loop 1 or 2 has
dropped below the threshold (1 to 15 dB)
set by the user.
CHREV Channels Reserved The Loop 1 & 2 HDSL pairs are reversed at
the HRU input port. Loop 1 is specified to
carry the (-) simplex DC voltage, and Loop
2 is specified to carry the (+) simplex DC
voltage.