Trunking control message – Codan Radio P25 Training Guide User Manual
Page 91
P25 RADIO SYSTEMS | TRAINING GUIDE
Chapter 6: P25 Trunking Page 83
Figure 6-7: Multiple Block Trunking (MBT)
Optionally
Protected
Alternate Multi Block Trunking Header
0
A/N
Bit 7
Bit 2
Bit 3
Bit 4
Bit 5
Bit 6
Bit 0
Bit 1
Octet 0
Octet 6
Octet 5
Octet 4
Octet 3
Octet 2
Octet 1
Octet 9
Octet 8
Octet 7
Octet 11
Octet 10
Blocks to follow
MFID
Logical Link ID
SAP Identifier
1
0
I/O
1
1
1
1
1
1
0
0
Opcode
Defined by Trunking Messages
Header CRC
Defined by Trunking Messages
Multi-Block Trunking Packet
0
A/N
Bit 7
Bit 2
Bit 3
Bit 4
Bit 5
Bit 6
Bit 0
Bit 1
Octet 0
Octet 6
Octet 5
Octet 4
Octet 3
Octet 2
Octet 1
Octet 9
Octet 8
Octet 7
Octet 11
Octet 10
Blocks to follow
MFID
Logical Link ID
SAP Identifier
1
0
I/O
1
1
0
1
1
1
0
0
Pad Octet Count
Reserved
Header CRC
Data Header Offset
0
0
0
Unconfirmed Data Header
Bit 7
Bit 2
Bit 3
Bit 4
Bit 5
Bit 6
Bit 0
Bit 1
Octet 0
Octet 6
Octet 5
Octet 4
Octet 3
Octet 2
Octet 1
Octet 9
Octet 8
Octet 7
Octet 11
Octet 10
Trunking Control Message
Data Block
Bit 7
Bit 2
Bit 3
Bit 4
Bit 5
Bit 6
Bit 0
Bit 1
Octet 0
Octet 6
Octet 5
Octet 4
Octet 3
Octet 2
Octet 1
Octet 9
Octet 8
Octet 7
Octet 11
Octet 10
Trunking Control Message
Packet CRC (Last Data Block Only)
Last Data Block