Channel Packet Parameters; Channel Packet Bytes 0 And 1 (Len); Channel Packet Bytes 2 And 3 (Type); Channel Packet Bytes 4 And 5 (Seq) - Digital Voice Systems Net-2000 User Manual

Net-2000™ Voice Codec Unit
User's Manual
short
short
short
short
short
short
short
short
char
};
Note that each bit of channel data occupies one byte of the channel[] buffer in the packet.
The remaining bytes in the channel[] buffer are ignored. The elements of the Decode
packet are described in detail in the following sections.

Channel Packet Parameters

Channel Packet Bytes 0 and 1 (len)

The len parameter (bytes 0 and 1) hold the 16-bit length of the packet (Table 3). The packet length is
always 218 bytes.
len = Length (in bytes) of total packet (including header)
Data Packet Size

Table 14 Channel Packect len header parameter

Channel Packet Bytes 2 and 3 (type)

The type parameter (bytes 2 and 3) is 16-bits packet type and is always 0x003 for channel data.
type = Packet type
Channel Data
Table 15 type header parameter

Channel Packet Bytes 4 and 5 (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.
DVSI Confidential Proprietary
len;
type;
seq;
rate[5];
cmode;
tone[2];
ws;
format;
channel[192];
7 6 5 4 3 2 1 0
0 0 0 0 0 0 0 0
7 6 5 4 3 2 1 0
0 0 0 0 0 0 0 0
Byte 0
7 6 5 4 3 2 1 0
1 1 0 1 1 1 0 0
Byte 2
7 6 5 4 3 2 1 0
0 0 0 0 0 0 1 1
Section 3 – Net-2000™ VCU Control
Byte 1 Decimal
Value
220 bytes
Byte 3
Hex Value
0x0003
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