Thanks for the great and insight-full responses Mike, Sean, and Chad. PPP is not an option at this point due to equipment limitations. However, I think T.38 header might be a good. I have to explore that and if it's not then Radio Packets should teach me a lot.
Thanks again guys, Bruce On Sun, Dec 11, 2011 at 2:07 PM, Chad Osmond <[email protected]> wrote: > Packet radio applications will do this. You can modulate to a wav play > that wav to the far side and on the far side save to a.wav and.demodulate. > > My guess is 2400 would be the expected speed. > > Chad > On Dec 10, 2011 5:13 PM, "Bruce N" <[email protected]> wrote: > >> Hi everyone, >> >> I have a situation where there is a PSTN line but there is no 56k Modem; >> However there is a Linksys ATA with an FXO port attached to PSTN line and >> registered to Asterisk. I want to stream "data" back and forth. No audio. >> >> I understand that is what a 56k modem best does in case of a PSTN analogue >> line. I want to know if there is any method, algorithm (like using various >> pitch sounds to send data) that I can take advantage of with or WITHOUT >> using Asterisk? Currently, I am looking to send alpha-numeric in >> 30-50 characters but later on, it can get larger so error correction, >> error >> detection (maybe using a hash digest), and as fast data-transfer as >> possible (close to 56k) is ideal. I am assuming that 56k modems are the >> fastest possible over analogue lines (since they have patented algorithms >> and chips specifically built for this purpose)?! >> >> Currently in Asterisk 1.8x there is a morsecode() application which is >> really cool but of course it's very slow. Also, there is no Morse code >> reader for Asterisk (I could be wrong; please correct me if so). Or a very >> basic thing I can do is to use DTMF and assign each letter a number and >> transmit/decode on the Asterisk side but it will be really slow for my >> purpose. So, something like that should do the job but since this is to be >> machine automated I am sure it can be much faster using various pitch >> sounds in much smaller intervals per code. Another example of this is some >> programs that exist for amateur radio operators where a radio along with >> GPS can be used to track location of a car. >> >> Any input, however technically in-depth, is much appreciated. >> >
