Digital Voice Systems Net-2000 Especificações descarregar pdf (Página 46)

Net-2000™ VCU Users Manual

Version 4.0, December, 2013

Interface Protocol

type = Packet type

16 bit Word

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

Command Packets

Byte 2 Byte 3 Decimal Value

Reset 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

Encode 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 2

Decode 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 3

Response Packets

Byte 2 Byte 3 Decimal Value

ACK 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

NACK 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1

Voice 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 2

Channel 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 3

Table 10 type Header Parameter

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

Reset Start Value 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

Maximum Value 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 32767

Table 11 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.

6.3.2 Channel Data Packet

Channel Data Packets contain channel data output by the encoder (coded speech) or are inputs to the decoder to

synthesize speech. Decode Command Packets and Channel Response Packets use the Channel Data Packet format.

6.3.2.1 Decode Command Packet

The VCU can receive Decode Command Packet from another VCU in VOIP mode or from a PC in File Mode. In

VOIP mode, the VCU decodes the channel data and sends the synthesized speech to the VCU analog outputs. In File

Mode, the VCU decodes the channel data and transmits a Voice Response Packet.

6.3.2.2 Channel Response Packet

The VCU transmits a Channel Response Packet to a PC in File Mode after encoding a received Encode Command

Packet.

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Digital Voice Systems Net-2000 Especificações Página 46