P25 data applications – Codan Radio P25 Training Guide User Manual
Page 42
TRAINING GUIDE | P25 RADIO SYSTEMS
Chapter 3: P25 Technical Information
Page 34
Routine Group Call Procedure
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NAC and TGID are set by the user (Channel Selector).
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MFID is set to standard value for CAI transmission.
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MI, ALGID, and KID are set by secure or clear mode parameters.
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Emergency bit is set to indicate non-emergency call.
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Source ID is the Unit ID of the radio.
Emergency Group Call Procedure
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NAC and TGID are set by the user (Channel Selector).
•
MFID is set to standard value for CAI transmission.
•
MI, ALGID, and KID are set by secure or clear mode parameters.
•
Emergency bit is set to indicate an emergency call.
•
Source ID is the Unit ID of the radio.
Individual Call Procedure
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The Unit ID of the user to be called is entered into the radio and this is the Destination ID.
TGID is set to the null talk group of $0000
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NAC is set by the user (Channel Selector).
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MFID is set to standard value for CAI transmission.
•
MI, ALGID, and KID are set by secure or clear mode parameters.
P25 DATA APPLICATIONS
P25 supports the transfer of data over the air (by the Common Air Interface) in the form of data packets.
Some Data applications include Over The Air Rekeying (OTAR) of encrypted radios, Trunking System
Control Channel messages, and user data applications such as GPS, Alarm Monitoring and System
Status.