36 System Feature Overview
April 2011 68007024085
Channel is configured in portable and mobile radio CPS at the Digital Emergency Systems
settings.
The Capacity Plus system does not support a revert channel for emergency. The start of an
Emergency Call is announced over all busy channels. This allows a listening radio that is
interested in joining the Emergency Call, to leave its channel and join the Emergency Call. A radio
is interested in an Emergency Call if the emergency group is either the Tx-Group, or is in the Rx-
Group list of the radio. A radio listening to an Emergency Call (e.g., e1) joins another Emergency
Call (e.g., e2), only if the e2’s group has a higher priority than the e1’s group. The first priority is the
Tx-Group, followed by any Rx-Group in the Rx-Group list of the radio.
The Capacity Plus system ensures that an Emergency Call should start on a channel where the
users monitoring the “Emergency” group are present. There are some behavior differences in
software versions R01.05.00, R01.06.00 and R01.07.00. This is shown in the following flowchart:
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