User`s manual

Page 48
DVSI Confidential Proprietary
USB-3000™
User’s Manual Version 1.6a
Section 4 - Data and Configuration Packets
Digital Voice Systems, Inc.
The Speech Compression Specialists
4.5. US
he packet inte
B-3000™ P25 and USB-3000™ P25-OEM Packet Interface
rface used by the USB-3000™ P25 and USB-3000™ P25-OEM is the same as to the one used
expanded to support two additional custom rates . To
run the APC s
APCO Project 25 full-rate (PKT_RATEP field)
To select the A tal) is used
C (7200 bps)
T
in the USB-3000™, except that the PKT_RATEP field is
O Pr he following packet fieldoject 25 rates t can be used.
PCO full-rate vocoder via packet interface the PKT_RATEP field (13 bytes to
Example of a PKT_RATEP field with the APCO Project 25 full-rate with FE
Field Identifier RCW 0 RCW 1 RCW 2 RCW 3 RCW 4 RCW 5
0x0A 0x0558 0x086b 0x1030 0x0000 0x0000 0x0190
Table 6 PKT
Example of a PKT_RATEP field with the APCO
_RA elect full-rate with FEC TEP Field to s
Project 25 full-rate with No FEC (4400 bps)
Field Identifier RCW 0 RCW 1 RCW 2 RCW 3 RCW 4 RCW 5
0x0A 0x0558 0x086b 0x0000 0x0000 0x0000 0x0158
Table 7 PKT_RATEP Field to select full-rate with No FEC
APCO Project 25 half-rate (PKT_RATET field)
To select the AP f-rate vocoder via packet i bytes total) is used.
Example of a PKT_RATET field with the APCO Proj
CO hal nterface the PKT_RATET field (2
ect 25 half-rate with FEC (3600 bps) Rate Index 33
PKT_RATET Field
Field Identifier Control Field Data
1 Byte 1 Byte
0x09 0x21
Table 8 PKT
Example of a PKT_RATET field with the APCO Project 25 half-rate with No FEC (2450 bps) Rate Index 34
_RATET Field to select Rate Index Value 33
PKT_RATET Field
Field Identifier Control Field Data
1 Byte 1 Byte
0x09 0x22
Table 9 PKT_RATET Field to select Rate Index Value 34
4.6. USB-3000™ SAT and USB-3000™ SAT-OEM Packet Interface
The packet interface used by the USB-3000™ SAT and USB-3000™ SAT-OEM is the same as to the one used
in the USB-3000™, except that the PKT_RATET and PKT_RATEP fields are expanded to support two
additional rates (Rate 62 and Rate 63) . To run the TerreStar / GlobalStar rates the following packet fields can
be used.