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Technology Stocks : LAST MILE TECHNOLOGIES - Let's Discuss Them Here
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To: MikeM54321 who wrote (1608)7/20/1998 7:44:00 PM
From: DenverTechie  Read Replies (4) of 12823
 
I know it may be hard to believe that 1.5 Mb/s can be delivered over your phone line.

It seems too good to be true. I outlined some of how it works in my post before this one. The phone company achieves this little miracle by putting a POTS splitter in front of the circuit switch to split off the data service like Internet access to its broadband network, while your voice message goes on to the circuit switched network with the big CO switch just like it always has. So the convoluted answer is that the ADSL "high speed data" service is delivered via a packet switched network like you would expect. And your voice part of the ADSL signal is delivered via a circuit switched network, just like you would expect.

The crazy part is that they combine the 2 signals coming from the different networks at a place called an "access node", which is the concentration point for broadband and narrowband signals/information. The access node can combine digital broadcast, broadband data (packet), narrowband data (circuit) and even network management information all onto the xDSL modem for transmission down that old non-conditioned twisted pair copper line to your house. That's where the xDSL modem in your house splits it all out again and sends it to the appliance like phone, TV or computer that you want it to go to (and changes it back to the format that appliance likes to see).

That's probably more than you were looking for and I've started to ramble. Anyway, that's why I say it's a dedicated service that can guarantee the 1.5 Mb/s on your line, while the cable guys can't say that (although they can engineer the shared medium so that you get quoted minimum QoS or Quality of Service using certain cable modems - but that's another long story by itself).
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