Arndt- [ VDSL Time Line ]
here's my view of the story:
For VDSL you need FTTC, but it's far too expensive to do that to every residential area.
Even if operators have extensive fiber plans, there are calculations that it would take e.g. France Telecom over 30 years to excange all their copper with fiber, leave alone the costs.
So, for residential, ADSL is doing the job. For business, VDSL is likely to take over when it's available.
One more thing: ADSL has a TTM advantage, VDSL will not be around for quite some time. Indications are, that you'll start to see "super HDSL" systems, which will run at 4 or 8 Mbit/s symmetrical over 2 or 4 wire cable around 1.5 to 2 km. Also interesting: due to asymmetrical speeds up- and downstream it will technically probably not be possible to deploy ADSL and VDSL in the same bunch of copper.
For VDSL you need FTTN Fiber to the Neighborhood
Would like your the source of the Super HDSL system info?
I agree, with the statement ADSL/VDSL in the same bundle, but can you explain what type of interference is the caused?
"2 or 4 wire cable" It would sound better stated as twisted-pair or standard home, which most have 4 wire twisted.
Could you narrow down "quite some time"
BTW what is this TTM advantage ADSL has? Time To Market?
If your able to deliver fiber to the center of a one mile radius, then you have no need to have ADSL running in that radius. If a customer wants just Internet Access you sell the bandwidth at a predetermined Rate Adaptive Speed. But if the customer wants Multiple Channel HDTV and Net Access, you can use the entire 52MB.
In short, who ever wants to give you VDSL, only need lay fiber from the Central Office (CO)to the center of a one mile circle of copper spider web. Giving us Fiber to the Curb ( Know any one that lives at the Curb?) is costly and will take "decades" tear up the streets and install fiber or HFC Hybrid Fiber Coax.
Until such time if your not using Wireless for Phone, TV programming, Net Access Such as LMDS (Cellular Vision)
Then the only way to get those options is through the copper that is located in almost every room of your home, and 800 million other phone lines in the world.
If you were a Telco, would you not want to provide HDTV programming to your customer? for Cost of running 1 mile of glass strand to the center of the Twisted Pair Spiderweb. Add a few DSLAMS at the core, and your a Cable company a high speed Net access, and NET Digital Phone service, and a host of other digital services.
Here in the USA, 85 percent live with 1,800ft (ADSL) of the CO. VDSL will run 1 mile and under, there is a large market that lives within 1 mile.
VDSL will be around in a "very short time", but no, its not a near term solution for everyone, of course that's why have ADSL/DMT for the interim.
VDSL will roll out soon and much faster in parts of the Pacific Rim.
Should you add a direct quote, please show the URL to the source, or the Issue of the Tree Pulp publication. It's a great habit, helps all participates, and adds to the knowledge of the AI SI.
A piece on Amati/NEC VDSL from JW after Supercomm 96
techstocks.com
Another View point. Note: FC stands for Fiber Channel witch is a Product of ANCOR
techstocks.com
Have followed ANCR since Apr 96. Bought in @ $4 1/4 in May 97.
Wish I had the chance to get the same deal on CIENA.
JW@KSC |
