Section 350-231-172
Revision 01
14
HLU-231 List 7B
Four-Character Diagnostic Messages
The HLU-231 diagnostic messages are listed in the table below.
Diagnostic Messages
Message
Full Name
Description
FERR
Framing Bit Error
Occurred
Framing bit error occurred at HLU T1
input.
LBPV
Local Bipolar
Violation
A bipolar violation has been received at
the T1 input to the HLU.
SIG1 or SIG2
Signal 1 or Signal 2
The HLU and HRU transceivers are trying
to establish contact with each other.
S2L1 or 2
†
Signal 2 Loop or
Loop 2
The 1st Doubler and either the HRU or
2nd Doubler transceivers are trying to
establish contact with each other on loops
1 or 2 of span 2.
S3L1 or 2
†
Signal 3 Loop or
Loop 3
The 2nd Doubler and HRU transceivers
are trying to establish contact with each
other on loops 1 or 2 of span 3.
ACQ1 or
ACQ2
Acquisition 1 or
Acquisition 2
The HLU and HRU multiplexers are trying
to establish synchronization over each
loop.
A2L1 or 2
†
Acquisition 2 Loop
1 or Loop 2
The 1st Doubler and either HRU or 2nd
Doubler multiplexers are trying to estab-
lish synchronization with each other on
loops 1 or 2 of span 2.
A3L1 or 2
†
Acquisition 3 Loop
1or Loop 2
The 2nd Doubler and either HRU multi-
plexers are trying to establish synchroni-
zation with each other on loops 1 or 2 of
span 3.
ACO
Alarm CutOff
A minor alarm has occurred, and been
retired to an ACO condition, through the
use of the HLU front panel SEL button.
Self Test
The HLU is in a self test mode. This
occurs every power ON/OFF cycle.
†
These messages only apply to systems with doublers present.
Summary of Contents for 150-1111-72
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