ppp over dsl and dialup..urgent!

harrypotter February 5, 2009 at 08:50:04
Specs: Windows XP
Hi frnds!I am a student.I have read in the text that PPP can be used directly on dialup connections, but on DSL we use PPPoE(PPP over ethernet).why exactly this difference?Why shouldnt we use PPPoE in dialup?(cos when we link up comps and connect it to dialup connection,we need ethernet too right?).Are both DSL and dialup modems are serial port devices?I read in wikipedia that external modems have parallel ports!.Arent DSL modems external modems?.so are they parallel?please explain:)

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February 5, 2009 at 09:45:45
Dial up modem and DSL modems are completely different things, one being analogue and the other digital.

Broadband modems generally use Ethernet, sometimes USB, but never the serial port nor parallel, in fact neither dial-up or broadband modems use parallel ports.

Dial-up always uses a serial port, whether internal or external. I have never seen a dial-up modem with a parallel port. There is nothing to be gained by using a parallel port except give the modem more work to do and you dont need Ethernet with dial-up, just an RS232 serial port.

The are many different type of point to point protocols, for instance I use a broadband modem connected to Ethernet and use PPPoATM, that's PPP over Asynchronous Transfer Mode.

Just to confuse you even more, TCP/IP which is what the Internet runs on is not a point to point protocol. But you need a point to point protocol in order to connect to your ISP. It is all done with encapsulation. Look it up on Google.


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February 6, 2009 at 15:13:46
What makes this an "Urgent" problem? Just askin...

"So won’t you give this man his wings
What a shame
To have to beg you to see
We’re not all the same
What a shame" - Shinedown

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