Freedom R8100 SERIES, Operator'S Manual

Page: 119 / 255

119
Field Mnemonic Bits Note
Network Identifier NID 16
Network Access Code NAC 12
Data Unit ID DUID 4 See Table 2.2.7.3.1.3-3
Header Word 120
Message Indicator MI 72 Encryption is not supported
Manufacturer’s ID MFID 8 Not displayed
Algorithm ID ALG 8 Encryption is not supported; 80 is
unencrypted
Key ID KID 16 Encryption is not supported
Talk-group ID TGID 16 Not displayed
Link Control LC 72 Format varies
Format LCF 8
Protected flag P 1 Encryption is not supported
Standard Format SF 1
Opcode LCO 6
Content 56
Low Speed Data LSD 32
Status Symbols (6) SS 12 See Table 2.2.7.3.1.3-2
Table 2.2.7.3.1.3-1. P25 Voice Frame Fields
Note: Although encryption is not supported, Header Word fields and the Link Control Format (LCF) will
be displayed correctly because they are not subject to encryption. Therefore, if these fields indicate
encryption, other fields will not be displayed correctly. Fields that are subject to encryption include the
vocoder information and Link Control information content.
Value (binary) Note Transmitter
00 Unknown, use for talk-around subscriber
01 Inbound Channel is Busy base station/repeater
10 Unknown, use for inbound or outbound subscriber
11 Inbound Channel is Idle base station/repeater
Table 2.2.7.3.1.3-2. P25 Status Symbol Codes
Note: Status symbols are combined by concatenating their binary values but are displayed in hexadecimal.
For example, an idle channel that just became busy is displayed as D5 (11010101).