Nack Packet Parameters; Table 50 Len Header Parameter; Table 51 Type Header Parameter - Digital Voice Systems Net-2000 User Manual

Net-2000™ Voice Codec Unit
User's Manual
Nack packets have the following format described Table 18 and C-language data structure below:
struct nack_packet_t {
short
short
short
short
short
};
The size of the Nack packet is ten bytes. The elements of the Nack packet are described in detail in
the following sections.

Nack Packet Parameters

Nack 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 is
ten bytes.
len = Length (in bytes) of total packet (including header)
Ack Packet Size

Table 50 len header parameter

Nack Packet Bytes 2 & 3 (type)
The type parameter (bytes 2 and 3) is 16-bits packet type and is always 0x0001 for nack packets.
type = Packet type
Nack

Table 51 type header parameter

DVSI Confidential Proprietary
len;
type;
seq;
cmd;
reason;
Byte 0
7 6 5 4 3 2 1 0
0 0 0 0 0 0 0 0
Byte 2
7 6 5 4 3 2 1 0
0 0 0 0 0 0 0 0
Section 3 – Net-2000™ VCU Control
Byte 1 Decimal
7 6 5 4 3 2 1 0
0 0 0 0 1 0 1 0 10 bytes
Byte 3
Hex Value
7 6 5 4 3 2 1 0
0 0 0 0 0 0 0 1
Value
0x0001
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