Codan Radio P25 Training Guide - Manual (Page 63)

P25 RADIO SYSTEMS | TRAINING GUIDE
Chapter 4: Anatomy of the Common Air Interface Page 55
S - Explicit Source ID Required
%0 Explicit Source ID is not required.
%1 Explicit Source ID is required. The next LC will contain the Source ID including
Network ID and System ID. Used for trunked systems only.
Service Options
This fi eld contains individual bits that indicate the type(s) of service being requested or provided. The
Service Options are diagrammed in Figure 4-8:
Figure 4-8: Service Options
E - Emergency
%0 Normal or non-emergency status
%1 Emergency status requiring special processing
P - Protected
%0 Resources (other than the control channel) should be non-encrypted
%1 Resources (other than the control channel) should be encrypted
D - Duplex
%0 Half duplex, the subscriber is capable of transmitting but not simultaneously receiving on the assigned channel
%1 Full duplex, the subscriber is capable of transmitting and receiving simultaneously on the assigned channel
M - Mode
%0 Resources shall support circuit operation (data)
%1 Resources shall support packet operation (data)
R - Reserved
This bit is reserved and set to %0 by the sender and ignored by the receiver.
Priority Level
This indicates the relative importance attributed to the service that is being requested.
%000 Reserved %100 Default
%001 Lowest %101 System Defi ned
%010 System Defi ned %110 System Defi ned
%011 System Defi ned %111 Highest
E P
Bit 7 Bit 2 Bit 3 Bit 4 Bit 5 Bit 6 Bit 0 Bit 1
Priority Level
Service options
R D M