Motorola MOTOTRBO SYSTEM PLANNER Specifications Page 45

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36 System Feature Overview
November, 2008
2.4.3.4 GPS Revert Channel
The GPS Revert Channel feature allows system operators a configurable option to off load radio
transmitted location updates onto a pre-programmed digital channel that differs from the digital
Selected Channel. This feature effectively removes Location Update traffic from the Selected
Channel in order to free up that channel to accommodate increased voice loads and/or to enhance
the user experience by reducing the number of channel busies during voice call requests. This
feature also allows a large group to communicate on a single voice channel while sending location
updates on multiple GPS Revert Channels to accommodate larger Location Update loads. This
increases the Location Update throughput associated with radios belonging to a single group.
Each channel programmed into the radio has a configurable CPS option to designate the GPS
transmission channel on which it transmits Location Update messages. The CPS options for the
GPS transmission channel are Selected, All, and None. Choosing Selected means that the GPS
updates are transmitted on the current channel. In the case of All, a single channel must be
chosen from the list of all channels. This chosen channel is known as the GPS Revert Channel
and this is where GPS updates are transmitted on. It is understood that there may be instances
when the radio is known to be out of range of any control station accepting location updates. In
order to extend battery life, minimize time away from the Selected Channel, and/or to efficiently
use frequency resources in these situations, the radio can also be configured to disable the
transmission of Location Update messages on a per channel basis by using the selection None. It
should be noted that a radio will be shown as present to the dispatcher when a radio is switched
from a GPS enabled channel to a GPS disabled channel until the presence indication duration is
exceeded.
To configure the radio to support location updates, there are a few parameters that must be
managed correctly. How these parameters interact to dictate the radio’s performance is shown in
the table that follows. These parameters are the radio wide GPS setting that resides in the General
Settings CPS folder, and the ARS and GPS Revert settings that are present for each channel
defined in CPS. In this case the channel being defined is titled “Channel1”. Also, in the case where
a GPS Revert Channel (GPS1) is selected, this requires that GPS1 has already been defined as a
channel in CPS.
General
Settings: GPS
Channels:
Zone1
Channel1
ARS
Channels:
Zone1
Channel1
GPS Revert
Result
Not Enabled Not Enabled Not Selectable
GPS Chip: Disabled
Presence: Disabled
Location: Disabled
Not Enabled Enabled Not Selectable
GPS Chip: Disabled
Presence: Enabled
Location: Disabled
Enabled Not Enabled Not Selectable
GPS Chip: Enabled
Presence: Disabled
Location: Disabled
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