Sony Ericsson / Sony : Symbian phones : Circuit Switched Data vs GPRS: whats better?
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Hey, i've heard something about circuit switched data but im not too sure what its actually all about.
Is it any better/faster than GPRS for internet access?
And if so, how do i use it on my P900?
Cheers
Nik
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Posted: 2004-03-11 17:12:47
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CSD is just your normal dial up where you dial a number to connect to an internet service provider and is limited to 9.6kbps on most networks
GPRS on the other hand is the internet connection provided by the mobile phone operator and can be has high as (approx) 50kbps or more depending on your phone and operator
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Posted: 2004-03-11 17:17:38
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There is HSCSD (High Speed Circuit Switched Data) which is faster at 28.8 but really its old hat. GPRS is alot better as it is on size rather than time. Check my e-mail is 1k usage. £3 per Meg. CSD was just a hassle and more expensive when checking e-mail. You can also take your time with WAP.
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Posted: 2004-03-11 17:21:47
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Ah right cheers thanx
So i take it with GPRS you can load up a webpage and stay on it for as long as you want. You only get charged for the actual transfer of data to your phone?
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Posted: 2004-03-11 17:31:44
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exactly!
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Posted: 2004-03-11 17:32:23
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quality!
nice one, cheers guys
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Posted: 2004-03-11 17:38:19
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Getting into detail.
Several cellphones can use the same frequency for calls.
Each phone call uses a time slot to transfer the data.
HSCSD uses 2 or more time slots to transfer data.
So it's like you're using 2 or more phones to transmit the data in paralell.
9600 baud (the max for dial up) x number of time slots.
The tariff though is not like (number of slots x call tariff).
Operators have special prices for HSCSD.
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Posted: 2004-03-11 17:55:43
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You'll probably like this url Krubach. Don't ask me if its real or not though.
http://www.cantrip.org/nobugs.html
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Posted: 2004-03-11 18:18:44
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@Masseur
Actually HSCSD is a technology that rides on GSM as the bearer. HSCSD can go as high as 56K depending on the network and the MSC equipment involved. As an example, E-Plus in Germany is using Ericsson AXE-10 switches with the HSCSD service installed. If you connect to the HSCSD network using the ISDN V110 protocol or V120, you can connect at 56k, however most of the time the connection speeds are generally 43K.
P.S. I did the network planning for E-Plus and Mannesman(now Vodafone)
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Posted: 2004-03-11 19:37:26
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in england, only orange support high speed csd, but as it is in narrow band form, their maximum is 43 kb/s, but set it so upload and download is the same, so 28.8 kb/s, if you are sending the odd email or something, gprs is better, if you are downloading a whole load of emails, or sending a load of emails, in batch form, then hscsd is better, it depends what you are using it for, gprs is good for short bursts of data passing through if you're gonna read stuff before downloading newer content, like web browsing, whereas hscsd is good for constant data transfer as it is charged per minute instead of gprs which is charged for the amount of data
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Posted: 2004-03-11 20:32:15
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