From owner-freebsd-mobile  Mon May 15  8:16:43 2000
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Date: Mon, 15 May 2000 16:16:43 +0100
From: Roger Hardiman <roger@cs.strath.ac.uk>
Organization: University of Strathclyde
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To: karsten@rohrbach.de
Cc: Panagiotis Astithas <past@netmode.ntua.gr>,
	Borje Josefsson <bj@dc.luth.se>, mobile@FreeBSD.ORG
Subject: Re: Nokia Card Phone 2.0 PCMCIA GSM phone, need help
References: <391F1B16.D55661AD@cs.strath.ac.uk> <200005150600.IAA37101@snoopy.dc.luth.se> <20000515114308.A29850@netmode.ece.ntua.gr> <20000515165854.B93503@rohrbach.de>
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"Karsten W. Rohrbach" wrote:
> 
> > I don't think the GSM protocol can do more than 9600 bps.
> > Maybe 14400 under special conditions (GSM+ or something like that).

The Nokia Card Phone 2.0 implements HSCSD.
This has 2 parts.
1) data channels can be increased from 9600 to 14400
if the signal is good. (it reduces the number of error
correcting codes it sends, leaving more room for actual data)

2) it can bond multiple channels together to give to a higher
data rate.
You can bond upto 3 channels for download (3x14400 = 43200)
and have 1 channel for upload (14000)
which is good for web surfing, downloading.

or you can have 2 channels for download (2x14400 = 28800)
and have 2 channels for upload (2x14400 = 28800)
which is good for voice over IP or video conferencing.

You can also have 3 channels for upload and one for
download when sending bulk email.


If your signal is poor quality, the data channel drops back
to standard 9600, and you get 1, 2 or 3 channels at 9600
instead of at 14400.

Roger


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