Codan Radio P25 Training Guide - Manual (Page 47)

P25 RADIO SYSTEMS | TRAINING GUIDE
Chapter 3: P25 Technical Information Page 39
Triggering conditions
A number of triggering conditions may cause the subscriber to transmit the location information. Most
of the triggers are actions performed by the subscriber user. The P25 Location Services supports
confi guration and use of these triggers, but the subscriber manufacturer determines which triggers may
be implemented. All of the manufacturers supported triggering options should be enabled or disabled
by the administrator of the P25 system
The following are supported triggering conditions when the subscriber will transmit location information:
PTT – at the end of each PTT. This is only available on Conventional systems; Trunking systems do
not support it.
Periodic – on a programmable time interval (not less than 3 second intervals)
Emergency – when the emergency mode is entered, and whenever an emergency message is
transmitted.
Power On/Off – when the radio is powered on or off.
Host Request – in response to a request from the data host (Tier 2 only)
User Request – when the user of the subscriber requests that it be transmitted. (a button push for
example).
Distance Change – when the distance between the current and the last reported location exceeds a
specifi ed value.
The P25 Location Service specifi cation does not support triggering conditions for speed change,
direction change or a proximity trigger. This does not mean that a manufacturer cannot implement
these triggers in their subscriber.
The triggering conditions can be confi gured by commands sent by the LSHS to the subscriber, via the
bi-directional request/response protocol used in Tier 2. Tier 1 does not support the response/request
protocol.