Vladimir -
VZ: >>>>I am not buying this argument at all. I suspect that the ADSL at CO is also statistically maxed before being forwarded to the next switch. In addition the bandwidth of the info sent to you by a host(shared by hundreds if not thousends) could be significantly less then attainable by ADSL modem. And BTW I think you ignore the fact that the cable modem's baud rate could be so much higher so the sharing by the 50 to a 100 simultaneously connected subscribers becomes irrelevant. And there is no limitation on the distance from the house to CO.>>>>
THIS IS WHERE DSLAMS COME INTO PLAY.
DSLAMS simply multiplex traffic, this process should not be hard for you to understand, you sound like you have a good background.
ADSL traffic coming into the central/remote office is segmented by POTS circuit splitters to send the concurrent voice telephony
(should there the be any) to the voice network.
ADSL traffic is sent along to a shelf rack-mounted ADSL line cards, the number of ports vary depending on the maker, in the case of Amati there are 4 ports with the TI CHIP, then to the ISP or whatever data service the customer uses to established a connection.
All the concentrating takes place once the DSL traffic enters the network, which optimizes network resources and bandwidth on the back end connections to remote data services.
The numerous vendors tend to differ in there strategies. Some are working on routing the data to ATM Switches, some to TCP/IP Routers before it is sent to the connected data service.
Do you know of any companies who might have a large percentage of the router market, that might just want to work with a DSL company?
How about an ATM company that has an ATM Switch that's twice as fast as todays standard.
I hope that explains how the Central Office End Equipment handles DSL traffic in an efficient manner and not maxed out as you suspect.
As to your Cable modem Bullish side, Not all cable companies have the Financial where with all to replace the current One-Way Coax Infrastructure, like Time Warner has. Even Ted Turner happily agreed to get rid of this side of the house and concentrate on
the entertainment side. Cable Modems will be out there, but by the time most companies implement, DSL will have been in full swing operations for quite sometime IMHO.
DSL like a Wildfire will feed on the current installed POTS infrastructure (650 - 700 million pots lines, and growing), with nothing in its path to slow it down.
JW@KSC |
