Net-2000™ Voice Codec Unit
User’s Manual
Page 29
DVSI Confidential Proprietary
Section 4 – Net-2000™ VCU Interface Protocol
Reset Packet Parameters
len
The len parameter (bytes 0 and 1) hold the 16-bit length of the packet (Table 3). The packet length
is eight bytes.
len = Length (in bytes) of total packet (including header)
Byte 0
7 6 5 4 3 2 1 0
Byte 1
7 6 5 4 3 2 1 0
Decimal
Value
Reset Packet Size
0 0 0 0 0 0 0 0
0 0 0 0 1 0 0 0
8 bytes
Table 26 len header parameter
type
The type parameter (bytes 2 and 3) is 16-bits packet type and is always 0x0000 for reset packets.
type = Packet type
Byte 2
7 6 5 4 3 2 1 0
Byte 3
7 6 5 4 3 2 1 0
Hex Value
Reset
0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0
0x0000
Table 27 type header parameter
seq
Bytes 4 and 5 hold the 16-bit sequence number (see Table 5). 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*
Byte 4
7 6 5 4 3 2 1 0
Byte 5
7 6 5 4 3 2 1 0
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 28 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.
which