Freedom R8100 SERIES, Operator'S Manual

Page: 120 / 255

120
Value DUID Note
0 HEADER Header Data Unit
3 TERM Terminator without LC
5 LDU1 Logical Link Data Unit 1
7 TSBK Trunking Signaling Data Unit (block)
10 (and 5) LDU1:LDU2 Logical Link Data Unit 2 (and 1)
12 PDU Packet Data Unit
14 TERM(LC) Terminator with LC
- - Reserved
Table 2.2.7.3.1.3-3. P25 Data Unit Identifier Values
Note: The DUID field is LDU1 if the frame contained just the first Logical Link Control Unit before the
terminator. It is LDU1:LDU2 if the frame contains both the first and second before the terminator; they
are combined to display the complete information together.
Figure 2.2.7.3.1.3-4 P25 Voice Frame Decode Unit to Unit
The User Voice Call fields are from the Link Control code word. Raw displays all nine bytes directly;
subsequent fields display the same information in individual fields according to the Link Control opcode
(LCO), if applicable. The “0 - GRP_V_CH_USR” (Group Voice Channel User) message indicates the
user of this channel for group voice traffic, on both inbound and outbound messages (see Figure
2.2.7.3.1.3-3 for field details). The “3 – LC_U2U_V_CH_USR” (Unit to Unit Voice Channel User)
message indicates the user of this channel for unit to unit voice traffic, on both inbound and outbound
messages and on conventional and trunked systems. See
Figure 2.2.7.3.1.3-4 for field details.