System Feature Overview 29
This feature is supported in single site conventional, IP Site Connect, Capacity Plus and Linked
Capacity Plus system configurations. This feature is also supported by radios in analog mode.
WARNING: Because a phone patch call needs other call processing requirements in addition to
DTMF tones, simply connecting an APP box to the control station does not enable the
phone patch call capability. If phone patch calls need to be supported, please use the
configurations defined in the DTP feature. See “Digital Telephone Patch (DTP)” on
page 309.
2.3.2 Transmit Interrupt
The Transmit Interrupt feature is a suite of features proprietary to Motorola. This feature generally
allows a radio to shut down an ongoing clear, Basic Privacy, or Enhanced Privacy, or AES
interruptible voice transmission, and potentially initiate a new transmission. Transmit Interrupt is
independent of call type, therefore it applies to Group Calls, Private Calls, Emergency Calls and All
Calls. This feature also applies to Private Calls that are initiated via remote monitor command, and
Group Calls that are initiated via emergency remote monitor.
For software version R01.06.00, this feature is supported on digital direct channels, digital
repeater channels and IP Site Connect local channels. For software version R01.07.00 or later,
this feature is also supported on Capacity Plus system configurations and IP Site Connect wide
area channels. For IP Site Connect wide area channels, a repeater can use this feature to stop a
voice transmission where a radio continues to transmit even after failure of arbitration. This also
provides feedback to the transmitting radio that the transmission is not repeated over-the-air and
allows the radio to participate in a call started by another radio.
Transmit Interrupt is also supported on Linked Capacity Plus system configurations.
To support different use cases, Transmit Interrupt has four unique variations:
• Voice Interrupt: This feature allows a radio that is unmuted to an interruptible voice call,
to stop the ongoing voice transmission and initiate its own voice transmission to the
same call membership. Voice Interrupt is typically used during a prolonged voice
transmission when “late-breaking” or urgent information becomes available, and it is
necessary to disseminate the information to the group as quickly as possible.
• Emergency Voice Interrupt: This feature allows a radio to stop any ongoing
interruptible voice transmission, and initiate its own emergency transmission.
Emergency Voice Interrupt gives a radio an improved access to the radio channel, in an
emergency condition.
• Remote Voice Dekey: This feature allows a radio to stop an ongoing interruptible voice
transmission. It is typically used by a supervisor to remotely dekey a radio that is
inadvertently transmitting (e.g., the PTT is inadvertently pressed for an extended period
of time) and occupying the radio channel.
• Data Over Voice Interrupt: This feature allows a third-party data application on an
option board or attached PC to control the radio in order to stop any ongoing
interruptible voice transmission and initiate its own data message transmission. The
application can also specify in the data message, an option to discard itself, if an
ongoing voice transmission is not interruptible. This feature is useful in situations where
data traffic is more important than voice traffic. Data Over Voice Interrupt is not used by
any data applications native to the radio (e.g., Text Message, Location, and Telemetry
do not use Data Over Voice Interrupt).
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