System Feature Overview 31
2.3.2.1 Upgrading a System to be Transmit Interrupt Capable
There are several considerations when upgrading a deployed system that presently do not support
the Transmit Interrupt feature,
1
to become Transmit Interrupt capable.
For systems that use a DR 3000 repeater, the repeater software version must be upgraded to
R01.06.00, or later.
For systems that do not use privacy exclusively (See “Voice and Data Privacy” on page 95), radio
transmissions with privacy disabled and interruptible voice enabled cannot be received by radios
using software versions prior to R01.06.00.
For systems that use privacy exclusively, there are no major concerns receiving radio
transmissions with both privacy and interruptible voice enabled; provided the older release
supports the type of privacy being used by the radio provisioned with software version R01.06.00
or later.
To minimize service disruption during the upgrade period, systems that do not use privacy
exclusively may be upgraded using the following approach:
• Provision new radios with software version R01.06.00 or later. Configure two channels;
one channel with Transmit Interrupt features enabled, and the other channel with all
Transmit Interrupt features disabled. During the upgrade, the channel with all Transmit
Interrupt features disabled is used.
• Individually upgrade previously deployed radios to software version R01.06.00 or
later, and provision with the two channels described above. The channel with all
Transmit Interrupt features disabled is then used during the upgrade.
• For systems that use a repeater, the repeater may be upgraded to be Transmit Interrupt
capable at any time. Finally, once all radios have been upgraded to the compatible
software version, the channel with the Transmit Interrupt features enabled is used by all
radios on the system.
2.3.3 Digital Signaling Features
We have already described how digital calls utilize digital vocoding and error correction coding
processes, and that a given digital call occupies a single logical channel (frequency and TDMA
time slot). Within a given time slot, the digital call is organized into voice information and signaling
information. Included in the signaling information is an identifier used to describe the type of call
that is transmitted within the time slot (e.g. Group Call, All Call, or Private Call). Signaling
information also includes identification information and/or control information, which is used to
notify listeners on a voice call of system events and status (e.g. the ID of the transmitting radio and
the group ID). Because this information is repeated periodically during the course of the call, this
embedded signaling allows users to join a voice transmission that is already in progress and still
participate in the call. This is referred to as Late Entry, and is an advantage over analog signaling
schemes.
1. Systems that are running on software versions R01.01.00 – R01.06.00, or later which has the Transmit
Interrupt feature disabled in the CPS configuration, or non-Motorola equipment, etc.
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