>Any ideas on how I could use only ONE external modem to receive rs232 data
>and have it modulate the data so that I can output the audio to my soundcard
>or tape recorder. I only need 4800 baud. I am thinking I need to use a
>signal generator (imitate answering modem carrier)to fake my modem into
>staying off hook and doing a carrier detect. My research shows that for v.32
>audio of two modems negotiating, or just the answering modem. I have
>disabled dialtone detect by ATX0 and given it ATN0S37=7 to lock it to 4800
>baud and to disable automode. Do I need to also disable handshaking?
>OR am I totally out to lunch with my approach?
Lunch time. :-(
A v.34 modem negotiates a connection with another modem at the
distant end, and it takes more than just an answer tone.
Moreover, once they lock up, they are synchronized to each
other, and equipment which can lock onto it and decode either of
the two modems is expensive.
Basically it could be done with a 300 bps (Bell 103) modem (and
even at speeds higher than 300 bps too!), but not by anything
since the Bell 212A 1200 bps modems came out.
Quote:>I also built a circuit to provide enough milliamps to power the rj11 jack
Rj-11 jacks do not consume power.
Quote:>and have tapped into this phone cord to get the audio out. This circuit
>enables me to directly connect two modems without using phone system. My
>intention was to get two talking and then see if I could get to just the one
>modem scenario. Any help would be appreciated.
Generally, modems do not require any voltage on the line to
function. (If you have one that does, throu it away and buy a
You do know that using an audio tape recorder with FSK tones was
used by several "home" computers back in the 1970's? It was the
only thing available until inexpensive (well, relatively
inexpensive any way) floppy disks came along. But even when
floppies were big in size, small in storage capacity, and
expensive to use, they still beat the jacket off using an audio
tape recorder. And today, floppies have improved, while audio
tapes have not!
Floyd L. Davidson <http://www.ptialaska.net/~floyd>