Codan Radio P25 Training Guide - Manual (Page 96)

TRAINING GUIDE | P25 RADIO SYSTEMS
Chapter 7: P25 Phase 2 Page 88
P25 PHASE 2 TRUNKING SYSTEM OPERATION
A P25 Phase 1 Trunking system operates as shown in Figure 7-3.
Figure 7-3: P25 Phase 1 Trunking System
The control channel and all voice and data traffi c channels operate in a 12.5 KHz FDMA mode. The
subscribers request a traffi c channel by communicating with the Trunking Resource Controller (TRC)
on the control channel.
Traffic (Voice or
Data) Channel
FDMA
Phase 1
12.5 KHz
Subscriber Unit Subscriber Unit
Registration
Registers on Phase 1 FDMA
Control Channel
Talk Group
Control
Channel
FDMA
Phase 1
12.5 KHz
Traffic (Voice or
Data) Channel
FDMA
Phase 1
12.5 KHz
Voice or Data Call
Assigned any Phase 1 FDMA
Traffic Channel for all Voice
or Data Communications
Traffic (Voice or
Data) Channel
FDMA
Phase 1
12.5 KHz
Trunking Resource Controller (TRC)
C4FM
C4FM
C4FM
C4FM
C4FM
C4FM