System Feature Overview 25
NOTE: For the Voice Interrupt feature to operate consistently, all radios using the channel should
be provisioned with the ability to be interrupted. However, not all need to be provisioned
with the Voice Interrupt capability.
If some radios are provisioned without the ability to be interrupted (e.g., normally desirable for a
supervisor’s radio), then those transmissions cannot be interrupted and the radio user receives a
Channel Busy tone if the Voice Interrupt feature is attempted while receiving an uninterruptible
voice transmission.
If configured for Follow Admit Criteria and the previously configured channel access (Admit
Criteria) is set to either Channel Free or Color Code Free, the user will receive a Transmit Denial
Tone when they press the PTT while receiving a transmission for them. Users must wait until the
user stops transmitting and call hangtime starts before they are granted a transmission. Utilizing
the Channel Free Tone helps train users from transmitting too early. Although a setting of Always
may be useful for speeding up conversations for well disciplined users, it may cause undisciplined
users to “step over” other users. Therefore, it is recommended that most users are provisioned
with an In Call Criteria of Follow Admit Criteria.
2.2.3.6 Repeater Wake-up Provisioning
When there is no inbound traffic for a specified duration (Subscriber Inactivity Timer), the repeater
stops transmitting and enters an inactive state. In this inactive state, the repeater is not
transmitting, but instead it is listening for transmissions. When the user or radio needs to transmit
through the repeater, the radio sends a wake-up message to the repeater.
Upon receiving the wake-up message, the repeater activates and begins transmitting idle
messages. The radio then synchronizes with the repeater before it begins its transmission.
The repeater wake-up sequence is configurable within the radio. The number of wake-up attempts
(“TX Wakeup Message Limit“) and the time between the attempts (“TX Sync Wakeup Time Out
Timer”) may be altered if required to operate with other vendor’s systems. It is recommended that
these values remain at default while operating on MOTOTRBO systems.
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