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LTPH-UM-1049-02, Issue 2 Front Panel
H2TU-C-319 List 4E January 9, 2002 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 Cut Off A system alarm has occurred, and has been retired to an ACO
condition by pressing the LBK pushbutton on the H2TU-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.
HBER HDSL2 Block Error Rate A system HDSL2 Block Error Rate alarm is in effect.
LA Loop Attenuation Indicates that the attenuation on the HDSL2 loop has exceeded the
maximum threshold value.
LAIS Local Alarm Indication Signal Indicates an AIS (all ones) pattern is being received or transmitted
at the H2TU-C DS1 input or output ports.
LLOS Local Loss of Signal Indicates that no signal is detected at the DSX-1 input to the
H2TU-C. Causes a system alarm.
LOSW Loss of Sync Word Indicates that the HDSL2 loop has lost synchronization.
MAL Margin Alarm The margin on HDSL2 loop has dropped below the threshold
(0 to 15 dB) as set by the operator.
MTA Metallic Test Access Indicates the H2TU-C is in a metallic test access state.
PWR FEED GND Power Feed Ground The HDSL2 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 the Tip and Ring of the HDSL2 pair.
PRMF Performance Report Messaging - Far
End
H2TU-R PRM-FE BER threshold has been exceeded.
PRMN Performance Report Messaging - Near
End
H2TU-R PRM-NE BER threshold has been exceeded.
RAIS Remote Alarm Indication Signal Indicates an AIS (all ones) pattern is being received or transmitted
at the H2TU-R DS1 input or output ports.
RLOS Remote Loss of Signal Indicates that no signal is detected at the DS1 input to the H2TU-R.
Causes a system alarm.
RRAI Remote RAI—Remote Alarm
Indication at the H2TU-R (Net signal
has errors.)
Indicates an RAI alarm (yellow LED) from the CPE with errors from
the line unit or network.
SPN1 Span Number Accompanies the LOSW alarm and identifies the span where the
LOSW alarm occurred.
TRCI Transmit RAI-CI—TX RAI-CI
Indication - Customer Installation at
the H2TU-R (Net signal does not have
errors.)
Upon reception of an RAI (yellow LED) from the CPE, the H2TU-R
sends RAI-CI toward the network if the network signal received at the
H2TU-R is clear. If the network signal is impaired (LOS, AIS, or Loss
of Frame [LOF]), then the RAI is automatically passed on to the
network.
TUC Transmission Unit Central Office Accompanies the HBER, MAL, and LA alarm and indicates that the
alarm has occurred at the H2TU-R remote unit.
TUR Transmission Unit Remote End Accompanies the HBER, MAL, and LA alarm and indicates that the
alarm has occurred at the H2TU-R remote unit.
Continued