Front Panel
150-231-185-05, Revision 05
6
September 13, 1999
HLU-231 List 8E
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.
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
CDU
n
?
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-231.
NDU
n
?
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 the 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 dB or greater is adequate for
reliable system operation.
ACQ1 or ACQ2
Acquisition 1 or Acquisition 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.
A
n
L1 or A
n
L2
Acquisition
n
Loop 1 or
Acquisition
n
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. Therefore,
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-231 List 8E 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.
