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LTPH-UM-1031-03, Issue 3 Front Panel
H4TU-C-319 List 1 September 12, 2003 5
Table 2 lists the front-panel display messages. The four-character display reports the code of an alarm, loopback,
or diagnostic message and, in some cases, is 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 pushbutton on the H4TU-C front panel.
ALRM Alarm Condition Exists A system alarm condition is in effect.
DBER DS1 Bit Error Rate A system DS1 BER alarm is in effect and remains in effect until cleared.
DU1U or DU1D Doubler 1 Upstream or Downstream
Port
Precedes LA, HBR, and MAL and indicates the first H4D doubler HDSL4
upstream or downstream interface.
DU2U or DU2D Doubler 2 Upstream or Downstream
Port
Precedes LA, HBR, and MAL and indicates the second H4D doubler
HDSL4 upstream or downstream interface.
HBRx HDSL4 Block Error Rate Loop 1 or
Loop 2
A system HDSL4 Block Error Rate alarm is in effect. (x indicates
Loop 1 or Loop 2.)
LAx Loop Attenuation Loop 1 or Loop 2 The attenuation on the HDSL4 loop has exceeded the maximum
threshold value. (x indicates Loop 1 or Loop 2.)
LAIS Line Alarm Indication Signal Indicates an AIS (unframed all ones) pattern is being received or
transmitted at the H4TU-C DS1 input or output ports.
LLOS Line (Unit) Loss of Signal Indicates that no signal is detected at the DSX-1 input to the H4TU-C.
Causes a system alarm.
LOF Loss of Frame The DS1 input does not contain the ESF or SF frame pattern setting of
the FRMG option.
LOSW Loss of Sync Word Indicates that one of the HDSL4 loops has lost synchronization.
LRAI Line RAI Indicates an RAI alarm (yellow) from the CPE with an error-free signal
from the line unit or network. RAI signal is transmitted towards the
network.
MALx Margin Alarm Loop 1 or Loop 2 The margin at Loop 1 or Loop 2 of the HDSL4 interface has dropped
below the threshold (0 to 15 dB) set by the operator. (x indicates
Loop 1 or Loop 2.)
PWR FEED GND Power Feed Ground The HDSL4 loop is grounded.
PWR FEED OPEN Power Feed Open Indicates a line power open condition.
PWR FEED SHRT Power Feed Short Indicates a short between Loop 1 and Loop 2 of the HDSL4 pair.
PRMF Performance Report Messaging -
Far End
H4TU-R PRM-FE BER threshold has been exceeded at far end.
PRMN Performance Report Messaging -
Near End
H4TU-R PRM-NE BER threshold has been exceeded at near end.
RAIS Remote Alarm Indication Signal Indicates an AIS (unframed all ones) pattern is being received or
transmitted at the H4TU-R DS1 input or output ports.
RLOS Remote (Unit) Loss of Signal Indicates that no signal is detected at the DS1 input to the H4TU-R.
Causes a system alarm.
RRAI Remote RAI—Remote Alarm
Indication at the H4TU-R (Net signal
has errors.)
Indicates an RAI alarm (yellow) from the CPE with errors from the line
unit or network. RAI-CI signal is transmitted towards the network.
SPNn Span Number Accompanies the LOSW alarm and identifies the span where the LOSW
alarm occurred.
TUC Transmission Unit Central Office Precedes DBER, HBR, MAL, LA, and LOF alarms and indicates that the
alarm has occurred at the H4TU-C Central Office unit.
TUR Transmission Unit Remote End Precedes DBER, HBR, MAL, LA, and LOF alarms and indicates that the
alarm has occurred at the H4TU-R remote unit.
Continued