Specifications

Net-2000™ VCU Users Manual
Version 4.0, December, 2013
Interface Protocol
indicate the
actual number of samples in voice[]. The elements of the Voice Data Packet are described
in detail in the following sections.
6.3.3.4 Voice Data Packet Bytes 0 & 1 (len)
The len parameter (bytes 0 and 1) hold the 16-bit length of the packet (Table 3). The packet length can vary from
347 to 351 bytes.
len = Length (in bytes) of total packet (including header)
16 bit Word
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Byte 0 Byte 1 Decimal Value
Data Packet Size 0 0 0 0 0 0 0 0 x x x x x x x x 347 - 351 bytes
Table 31 len Header Parameter
6.3.3.5 Voice Data Packet Bytes 2 & 3 (type)
The type parameter (bytes 2 and 3) is 16-bits packet type and is always 0x002 for voice data.
type = Packet type
16 bit Word
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Byte 2 Byte 3
Hex Value
Voice Data 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0x0002
Table 32 type Header Parameter
6.3.3.6 Voice Data Packet Bytes 4 & 5 (seq)
Bytes 4 and 5 hold the 16-bit sequence number (see Table 33). The sequence number is used as a method to detect
if and when data packets are dropped, so it is important to ensure that consecutive sequence numbers are transmitted
for channel data packets during operation.
seq = Sequence number*
16 bit Word
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Byte 4 Byte 5 Decimal Value
Minimum Value 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 -32768
Maximum Value 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 32767
Table 33 seq Header Parameter
*Note: Sequence numbers should be incremented by one every time a packet is
transmitted. When the sequence number reaches 32767, the next valid sequence
number is -32768.
6.3.3.7 Voice Data Packet Bytes 6 to 17 (rate[0-5])
The rate[] array is used to indicate the vocoder type and is identical to the rate[] array in the Channel Data Packet
discussed in section Channel Data Packet Bytes 6 to 17 (rate[0-5]).
(Subject to Change) Page 51
DVSI CONFIDENTIAL PROPRIETARY