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Front Panel
Table 2
lists the front-panel display messages. The four-character displays reports the code of a pertinent alarm,
loopback or diagnostic message, in some cases followed by a second four-character message that modifies the first
message with a value or current configuration setting.
Message
Full Name
ALARM MESSAGES
ACO
Alarm CutOff
ALRM
Alarm Condition
BER
Bit Error Rate
LLOS
Local Loss of Signal
LOSW
Loss of Sync Word
MAL1 or MAL2
Margin Alarm Loop 1 or Loop 2
RLOS
Remote Loss of Signal
LOOPBACK MESSAGES
CDUn?
Customer Doubler n Loopback
CLOC
Customer Local Loopback
CREM
Customer Remote Loopback
NDUn?
Network Doubler n Loopback
NLOC
Network Local Loopback
NREM
Network Remote Loopback
SMJK
Remote SmartJack Loopback
DIAGNOSTIC MESSAGES
1=xx or 2=yy
HDSL Loop Margins
ACQ1 or ACQ2
Acquisition 1 or 2
AnL1 or AnL2
Acquisition n Loop 1 or Loop 2
ARM
HiGain System Armed
BAD RT?
No response from HRU
CODE xxxx
Line Code: AMI, B8ZS, AUTO
6
Table 2. Front-panel Display Messages
Description
A system alarm has occurred, and has been retired to an ACO
condition by pressing the SEL button on the HLU front panel.
A system alarm condition is in effect.
A system BER alarm is in effect.
Indicates that no signal is detected at the T1 input to the HLU.
Causes a system alarm.
Indicates that one of the HDSL loops has lost sync. Causes a system
alarm.
The margin on HDSL Loop 1 or Loop 2 has dropped below the
threshold (1 to 15 dB) as set by the operator.
Indicates that no signal is detected at the DS1 input to the HRU.
Causes a system alarm.
Query to initiate loopback at doubler n to CI, where n is the number
of the doubler.
Signal from customer is looped back to the customer at the HRU.
Signal from customer is looped back to the customer at HLU-231.
Query to initiate loopback at doubler n to network, where n is the
number of the doubler.
DSX-1 signal is looped back to DSX-1 at HLU.
DSX-1 signal is looped back to DSX-1 at the HRU.
Signal from DSX-1 is looped back at the HRU by the HRU SmartJack
module.
Indicates the power of the received HDSL signal on each loop
relative to noise. Any value of 06 dB or greater is adequate for
reliable system operation.
The multiplexers of the HLU and the HRU or first doubler are trying
to establish synchronization over Loops 1 or 2 of Span 1.
The multiplexers of the two devices on Span n are trying to establish
synchronization with each other on Loops 1 or 2, where n is the
number of the span.
Armed to respond to Intelligent Repeater Loop Codes.
The HLU does not receive any response from the HRU. Therefore,
the integrity of the HRU or the two HDSL loops (they may be open)
is questionable.
The line code that HLU-231 List 8A is receiving at its DSX-1
interface, if the DS1 option is set to Auto. Otherwise, it mimics either
of the other two DS1 line code settings, Alternate Mark Inversion
(AMI) or Bipolar with 8-zero Substitution (B8ZS). Displayed during
System Settings review mode.
September 7, 1999
150-231-181-01, Revision 01
HLU-231 List 8A
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Troubleshooting
