150-432-100-02, Revision 02
Front Panel
HLU-432 List 1
July 18, 2002
5
lists the front-panel display messages. The four-character panel display 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.
Table 2.
Front-Panel Display Messages
Message
Full Name
Description
ALARM MESSAGES
ACO
Alarm Cutoff
A system alarm has occurred and has been retired to an ACO condition
by pressing the SEL button on the HLU front panel.
ALRM
Alarm Condition
A system alarm condition is in effect.
BER
Bit Error Rate
A system BER alarm is in effect.
LLOS
Local Loss of Signal
Indicates that no signal is detected at the T1 input to the HLU. Causes
a system alarm.
LOSW
Loss of Sync Word
Indicates that one of the HDSL loops has lost sync. Causes a system
alarm.
MAL1 or MAL2
Margin Alarm Loop 1 or Loop 2
The margin on HDSL Loop 1 or Loop 2 has dropped below the
threshold (1 to 15 dB) as set by the operator.
RLOS
Remote Loss of Signal
Indicates that no signal is detected at the DS1 input to the HRU.
Causes a system alarm.
LOOPBACK MESSAGES
CDUn?
Customer Doubler n Loopback
Query to initiate loopback at doubler n to CI, where n is the number of
the doubler.
CLOC
Customer Local Loopback
Signal from customer is looped back to the customer at the HRU.
CREM
Customer Remote Loopback
Signal from customer is looped back to the customer at HLU-432.
NDUn?
Network Doubler n Loopback
Query to initiate loopback at doubler n to network, where n is the
number of the doubler.
NLOC
Network Local Loopback
DSX-1 signal is looped back to DSX-1 at HLU.
NREM
Network Remote Loopback
DSX-1 signal is looped back to DSX-1 at the HRU.
SMJK
Remote SmartJack Loopback
Signal from DSX-1 is looped back at the HRU by the HRU SmartJack
module.
DIAGNOSTIC MESSAGES
1=xx or 2=yy
HDSL Loop Margins
Indicates the power of the received HDSL signal on each loop relative
to noise. Any value of ‘06’ or greater is adequate for reliable system
operation.
ACQ1 or ACQ2
Acquisition 1 or 2
The multiplexers of the HLU and the HRU or first doubler are trying to
establish synchronization over Loops 1 or 2 of Span 1.
AnL1 or AnL2
Acquisition n Loop 1 or Loop 2
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.
ARM
HiGain System Armed
Armed to respond to Intelligent Repeater Loop Codes.
BAD RT?
No response from HRU
The HLU does not receive any response from the HRU. Thus, the
integrity of the HRU or the two HDSL loops (they may be open) is
questionable.
CODE xxxx
Line Code: AMI, B8ZS, AUTO
The line code that HLU-432 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.
