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Using AudioSpan

Audio Span -SVD (Simultaneous Voice and Data)

The Zoltrix 56K voice modem and the 336 Rockwell based voice models support Rockwell's Audio Span. This is a feature that allows you to send data files to another user of another modem that supports Audio Span, while also talking to them on the phone, using the same phone line. That's right, this feature no only allows you to talk to a friend while uploading or downloading a file, but also allows you to play your favorite multi-player game over the phone line while also talking to them. Imagine shooting the enemy, while saying "got you" to your friend.

Many software companies are adding support for Rockwell's Audio Span. But even if the software program does not directly support it, you may get it to operate just by changing the INIT string used by the  Program.

How to use Audio Span -SVD (Simultaneous Voice and Data)

Use the following directions to enable the Audio Span feature:

  1. Call the other party you want to play a game with or send data to, using your telephone connected to the phone jack on your modem.
  2. After the caller answers the phone, you can instruct them on exactly what they should do. In this example, inform them that you want to send them a program.
  3. Both Parties should now start a communications program in terminal mode (i.e. BitCom, HyperTerminal etc...)
  4. Both parties should now type the following command followed by the ENTER key:
AT-SMS=3 - SQS=1
Now you both need to agree on who is going to dial and who is going to answer.
One party should type the following command followed by the ENTER key:
ATA
While the other party sends the following command followed by the ENTER key:
ATD
While the modems are attempting to make the connection, you will no longer be able to hear the other party on the telephone handset. As soon as the SVD connection is established, you will see the CONNECT XXXX message from the modem and will be able to talk to the other party and  send or receive files.

When you want to end the connection, just instruct your software to hang up and put the phone headset back on hook.

You could use the same procedure to play a interactive game like Doom. Just modify the INIT string used by the program to include the -SMS=3 and -SQS=1 commands. An INIT string used successfully to test DOOM using this modem is as follows:

AT &F &C1 &D2 -SMS=3 -SQS=1
Just make sure to make a voice connection first using the phones connected to the phone jack on the modems, then instruct the software to dial at one end and answer at the other end.
Copyright@2000 Zoltrix International Limited
Last updated on May 06, 1999