Hello all,
First thanks for you Brian and ELrayes for replying, your replies are very helpful. Now, I know an extra requirment for my project, I have to send data from the microcontroller to the PSTN with the data rate of 56bps, so I have to use a modem. So, now I guess I need to use a modem chip such as the one from cermetek.
Concerning what you said rayes, I'm enforced to use the PSTN , it is one of a system specs, so I can't use popular wireless techniques which are easier to implement!
I have another question, I can't find many topics regarding the interfacing of a microcontroller with the PSTN, shall I use DSP chip or I just need to use a modem chip along with the microcontroller...
Sameh Yassin