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Net-2000™ VCU Users Manual

Version 4.0, December, 2013

File Mo

5.3 Processing Files with the Net-2000™-VCU Software

Note: There is PC source code provided on the included CD that interfaces to the Net-2000™-VCU in File Mode.

The README on the disc describe how to build and run the PC software example.

The PC program allows users to encode speech to a file and decode channel data from a file. The file mode works

in conjunction with software provided by DVSI that runs on a PC. To work in file mode you first have to load the

PC software onto a PC connected to an Ethernet network that has access to the Net-2000™-VCU. Set the Net-

2000™-VCU to file mode and the unit is now ready to accept packets from the PC using the PC program.

The PC program can run in Windows command prompt (DOS) window. It is comprised of commands that contain

the name of the file to be run and the address of the Net-2000™-VCU that will process it. The Net-2000™-VCU

can process one file at a time. Customized PC software can be written using the Protocol information that is

described in section 4.

In this mode when the Net-2000 receives a packet it processes it and returns a packet. If the packet is PCM data the

Net-2000 will encode it and return an encoded packet. . If the packet is encoded data the Net-2000 will decode it

and return and PCM packet.

When encoding packets the input to the Net-2000 should be raw 16-bit linear PCM samples in little-endian (PC)

byte-order. No headers or format descriptions should be included in the file, only the 8 kHz samples. The Net-2000

will return an encoded packet that contains the vocoder bits with one byte per vocoder bit. The Net-2000 encoder

output is always hard-decision -- i.e., each byte in the output file will either take the value zero (0) or one (1).

When decoding a packet of data make sure to set the vocoder type to be the same as the vocoder that encoded the

data. Otherwise, the Net-2000™-VCU will see the data as invalid and return silence.

5.4 FILE Mode PC-executable Program

The PC executable program is included with the Net-2000™-VCU. To install the PC software, first create a

directory called Net2000 and copy the contents of the floppy disk to it. To run the PC program, open up a command

prompt window, change to the Net2000 directory and run the net2k_file.exe file.

Configuration options for the executable are as follows:

-ip <ipaddr>

-r <vocoder_type><vocoder_rate>

-e <encoder_input_file> <encoder_output_file>

-d <decoder_input_file> <decoder_output_file>

-l <loopback_input_file> <loopback_output_file>

-f <encoder_input_file> <encoder_output_file> <decoder_input_file> <decoder_output_file>

****NOTE: When using the -f (full-duplex option the encoder_output_file> and the <decoder_input_file> cannot be

the same file. The file will be processed and save to the same directory that the PC executable software is located.

-sdbits <soft_decision_bits>

-cmode <4 digit hexadecimal cmode value for encoder (eg 0xf0a1 ) See table below

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Digital Voice Systems Net-2000 Spezifikationen Seite 41