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**Iphone** · 29-Mar-2007, 01:54 AM

This document's a little old but still pretty current:

http://www.slipstreamsolutions.co.uk...s_overview.pdf

Basically:

1. GSM dials like an 'old modem'. It's a point-to-point connection, i.e. from your mobile device (PDA/laptop) to a modem using a specified phone number. You're billed per second of connectivity regardless of how much data is transferred.

2. GPRS works like broadband. It's connected all the time (kind of) and you're only billed for each Byte you use. As far as you're concerned it's not point-to-point because you would not connect to a modem that you own - instead you connect into the O2 / Voda (etc) cloud and then you go across the Internet to where your infrastructure is.

In my opinion GSM is much inferior to GPRS. Why have the risk of managing a bank of remote access modems when O2 / Voda etc will do it for you with GPRS? And why go to the cost of a lengthy phone call when you might only be transferring a couple of bytes?

And TCP/IP is just a protocol that sits on top of your GSM/GPRS connection.

29-Mar-2007, 01:54 AM	#2 (permalink)
Iphone Fixed Error! Posts: 4,202 Join Date: Mar 2007 Rep Power: 6 IM:	Re: How the GPRS works and TCP/IP stack This document's a little old but still pretty current: http://www.slipstreamsolutions.co.uk...s_overview.pdf Basically: 1. GSM dials like an 'old modem'. It's a point-to-point connection, i.e. from your mobile device (PDA/laptop) to a modem using a specified phone number. You're billed per second of connectivity regardless of how much data is transferred. 2. GPRS works like broadband. It's connected all the time (kind of) and you're only billed for each Byte you use. As far as you're concerned it's not point-to-point because you would not connect to a modem that you own - instead you connect into the O2 / Voda (etc) cloud and then you go across the Internet to where your infrastructure is. In my opinion GSM is much inferior to GPRS. Why have the risk of managing a bank of remote access modems when O2 / Voda etc will do it for you with GPRS? And why go to the cost of a lengthy phone call when you might only be transferring a couple of bytes? And TCP/IP is just a protocol that sits on top of your GSM/GPRS connection.