Posted on 1999-12-10
Medium Priority
Last Modified: 2013-11-30
What is the difference between a ISDN, ADSL, Cable, T1, T2 & T3 connection to the internet?
Question by:fraser107
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Expert Comment

ID: 2273526
64 and/or 128 kilobits per sec. Usually connected via a serial port like a dial-up modem. Has 2 channels a and b with 64k on each. You can use one for internet and the other for normal phone calls or use both for data and get 128k total. standard serial ports are 115k so you get 128k you might have to buy a after serial port card.

1.5 to 9 Mbps receiving (like for downloads) and 16 to 640 Kbps sending (like uploading). Used over regular copper phone lines but is done digitally (no connecting phones on this line). Usually a 24h connection type using a modem or router that connects to a network card. New and looks neat.

seems to be 256 Kbps 2 Mbps. Uses a cable modem that connects to a network card. 24h connection. It works like a lan (local area network) in that your basicly sharing your connection with several people so it can degrade quickly the more people on it. Also because of this people might be able to snoop on your connection since everything is send to everyone on the "node" your on.

1.544Mbits per second. Has 24 channels of 64k each. Usually used by businesses. You can buy franctional T1. Expensive (I think about $1000 a month in the us). 24h connection

Don't think this exists.

43 Mbps. 672 channels of 64k each. Really fast stuff and usually used as part of the Internet backbone (not sure if that is still true). The big boy ISPs have this stuff (and more). 24h connection.


Fiber optics. 51.8mbps (oc1) to 2.488Gbps (oc48). 24 hour connection. I don't even want to know how much this would cost.

Accepted Solution

Hooligan earned 200 total points
ID: 2273537
an ISDN is a dedicated line that runs at 128 kbps (a little faster than twice that of a 56k modem), or a dual ISDN at 256 kbps

A cable modem is an internet connection that actually runs through your TV cable lines into your computer, and runs at about 1.5 Mbps per second (mbps is millions of bits per second) but a cable modem's speed is directly related to the amount of users currently connected to the hub, I believe, so it fluctuates widely.

xDSL (digital server line) runs at anywhere forom 128 kbps to 6Mbps depending on what you want to pay for.  It uses your standard copper phone lines.  Unlike a cable modem, it will not fluctuate in speed, as it is dedicated to you.

a T-1 was the first digital system for transferring info. I think bell came up with it?  not positive on that though, anyway, it can transfer data at up to 1.54 Mbps, and alot of ISP's and businesses/schools still use them today.  They are not cheap <g>

A T-3 is roughly equal to 30 T-1 lines, running at about 45Mbps, its pretty much as fast as you can get, and as expensive too.  

I dont think a T-2 exists <g>

remember, its in megaBITS not bytes, so divide the number by 8 to get it into megabytes <g>

Expert Comment

ID: 2273539
bah I didnt mean to submit that as an answer, my apologies

Author Comment

ID: 2274871
Thank you Hooligan! If I were to set up a web hosting business, what type of connection should I get and why?

Expert Comment

ID: 2275448
This question has been answered here already, and better than I would be able to.  I found the link for you, Id suggest ya give the 5 or 10 points it takes to get the answer..here is the link:


Good Luck!

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