GSM modem

anybody having information about GSM modem. I am working on a project of HDL based SMS sender System Design. Can anybody help?

http://www.laipac.com/gsm-gprs-usb-modem.htm
http://www.com1.fr/products/industri...prs_socket.php
http://www.rim.net/products/oem/index.shtml

I have used both the Nokia 30 and Siemens TC35i. Both are very easy to use and you got them up and running with a microcontroller app in a few hours. Just send commands in Hayes AT format, and off you go.

That is, assuming you don't want to modulate and demodulate the GMSK of the air interface, because that is slightly less straightforward

Bert

Hi,
you can find embedded modems and modules at www.falcom.de

Anybody has papers on gsm modem design?

could you please describe for me how it is work and how transmit digital data from voice channel.
thanks

A GSM cell phone is also a GSM modem. IF you want to do experimentation only, using a phone is easiest and cheapest way to go. They all respond to standard AT commands and do whatever a modem can do.