System Feature Overview 61
68007024085 April 2011
2.4.5 Data Precedence and Data Over Voice Interrupt
Data applications on the internal option board, or running on an attached PC, are able to request
priority treatment of data messages, and Data Over Voice Interrupt independently. To facilitate this,
the data application designates the precedence of each data message as being Immediate,
Priority, or Routine. When the radio receives a data message for transmission from an internal
option board or attached PC application, the radio determines the precedence requested for the
data message, and processes the data message accordingly.
The use of the precedence designators can be summarized as such:
• Immediate precedence is used to place data near the top of the queue and request the
Data Over Voice Interrupt feature.
• Priority precedence is used to place the data near the top of the queue without
invoking the Data Over Voice Interrupt feature.
• Routine precedence is used to place the data at the bottom of the queue.
Immediate precedence is used to automatically clear the channel of voice calls by using the Data
Over Voice Interrupt feature prior to beginning the data transmission. This capability departs from
the typical behavior of a radio system, which normally gives priority to voice calls over pending
data calls. The radio user whose transmission was interrupted receives a Talk Prohibit Tone until
the user releases the PTT.
For the Data Over Voice Interrupt feature to operate consistently, all radios using the channel
should be provisioned with the ability to be interrupted. If some radios are provisioned without the
ability to be interrupted (e.g., normally desirable for a supervisor’s radio), then those radios’
transmissions cannot be interrupted, and the data message will be placed near the top of the data
queue (behind any existing queues for Immediate precedence data messages). When Immediate
precedence is designated and a data (or control) transmission occupies the channel, the radio
must wait for the channel to become clear before initiating the data transmission.
Priority precedence is used to ensure that the data message is transmitted before any Routine
precedence data messages, and after any existing Immediate precedence data messages.
Priority precedence does not use the Data Over Voice Interrupt capability. When either Priority or
Routine precedence is designated, the radio must wait for the channel to become clear before
initiating the data transmission.
NOTE: The Data Precedence and Data Over Voice Interrupt features do not need to be configured
in the radio or repeater via the CPS because these features are always available.
For more information on the Data Precedence and Data Over Voice Interrupt features, please refer
to the MOTOTRBO Option Board ADK Development Guide on the MOTODEV Application
Developers website.
http://developer.motorola.com
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