Specifications

Excalibur Multirate DAP Installation and Operation
6-20
• Call - is a message produced by the operator from a DAP to the NMC. Call is
not available when the service is set for DDS or Clear Channel 64 Kbps. This
alarm provides a means of communication between the operator at the DAP site
and the operator at the controller station. This alarm is not stored in the alarm
buffer.
• Downstream Power Fail - generated by the remote DAP when it detects a unit
has lost power. The alarm is sent when the Digital Power Fail Input (DPFI) has
been active for 600 milliseconds.
• Analog Parameter Out of Range - generated when any Analog parameter
(Transmit Level, Receive Level, or Signal Quality) exceeds its threshold setting
for the amount of time selected.
• Framing Loss - generated by the DAP if it is not receiving Racal's proprietary
framing from the far-end unit. The alarm is sent when this condition is detected
for at least 1 second. This framing is required for non-interruptive operation.
This alarm is only available when the service is set for DDSNI or C64NI.
• Transmit Channel Streaming - generated by the DAP when RTS is active for
longer than the amount of time selected in the Parameter Threshold submenu and
the RTS Mode parameter in the RCP submenu is set to Switched.
• Receive Channel Streaming - generated by the DAP when DCD is active for
longer than the amount of time selected in the Parameter Threshold submenu and
the DCD Mode parameter in the RCP submenu is set to Switched.
• Transmit Channel Idle - generated by the DAP when RTS is inactive for longer
than the amount of time selected in the Parameter Threshold submenu and the
RTS Mode parameter in the RCP submenu is set to Constant.
• Receive Channel Idle - generated by the DAP when DCD is inactive for longer
than the amount of time selected in the Parameter Threshold submenu and the
DCD Mode parameter in the RCP submenu is set to Constant.
• Antistreaming Started - generated when RTS is active for longer than the amount
of time selected in the Parameter Threshold submenu and the antistreaming
function is enabled.
• Antistreaming Stopped - generated when RTS goes inactive after antistreaming
starts.
• Excessive Resynchronizations - generated by the DAP when the user-selected
number of resynchronizations occurs for longer than the amount of time selected
in the Parameter Threshold submenu.
• Lost Communication - generated by the central DAP in a multidrop network
when communication is lost with a remote unit for longer than the amount of
time selected in the Parameter Threshold submenu. This alarm is only available
when the service is set for DDSNI and the Automatic Poll parameter is disabled.