PairGain 150-1504-14, Быстрое руководство по установке, Страница: 13 / 20

Revision 01 Section 350- 431 - 114 -01
HLU- 431 List 1D Page 11
Testing
The HLU- 431 List 1D 4-character front panel display has many useful system
diagnostic messages. They are listed in the following table. This display
turns on when power is initially applied to the HLU-
431 List 1D . To conserve
power, the display only remains on for five minutes if neither the MODE or
SEL buttons are pressed. The use of either button activates the 4-character
display and restarts the 5-minute power-control timer.
Alarms
Only one alarm can be displayed at a time, therefore, only the highest priority
alarm is displayed if more than one alarm exists. The following table lists the
alarms in order of priority.
Status Menu Alarm Messages
Message Full Name Description
NONE No Alarms
LLOS Local Loss of Signal
No signal at the HLU- 431 List 1 D local T1
interface.
RLOS Remote Loss of Signal No signal at the HRU remote T1 interface.
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 CRC’s have exceeded the user
selected ES threshold.
DS1 Digital Service 1 DS1 input BPVs at the HRU have exceeded the
user selected ES threshold.
RAIS or
LAIS Remote Alarm Indicating
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 and 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.
ACO Alarm CutOff A minor alarm occurred and was retired to an
ACO condition after pressing the
SEL button on
the HLU front panel.