Closing In On 1Gbps Using DSL

angry tapir writes "DSL vendors are using a variety of methods, such as bonding several copper lines, creating virtual ones, and using advanced noise cancellation to increase broadband over copper to several hundred megabits per second. At the Broadband World Forum in Paris, Nokia Siemens Networks became the latest vendor to brag about its copper prowess. It can now transmit speeds of up to 825M bps over a distance of 400 meters."

Comments

Direct link to graphic

[rsborg]

https://gigaom.files.wordpress.com/2010/04/dslphantommodeexplained.jpg

Re:400M ?

[Thorfinn.au]

That means a mini DSLAM in a street pillar connected by fibre to the exchange, this gets the speed they need for the connection without the need to replace that last "mile". Still a significant cost to put in but saves about 80% on a full fibre retro-fit to the house/business

Re:4 pairs

[LoRdTAW]

I doubt most of the copper POTS wiring out there is cat 3. The phone wire used in most homes is the old 4 conductor cable that did not have twisted pairs. Nowadays I believe most of the four conductor phone cable is indeed twisted and meets CAT 3 standards. I bought some at home depot not too long ago and it was 4 conductor CAT 3 twisted pair with RED/GREEN and BLACK/YELLOW pairs. The non twisted pair might still be sold so no guarantee there.

And that is just the home wiring. Who knows what crusty old non twisted pair cable lurks between homes and the central office.

And getting back to the grand parent poster:
1000BT is an IEEE 802.3-2008 standard. It not only defines the data layer (how the bits are transmitted) but also the physical link which defines the electrical interface.
DSL is different than the 802.3 standard both at the data link layer and the physical layer. So its an apples to oranges comparison. Gigabit is Ethernet and DSL and other broadband technologies are completely different.

Re:400M ?

[ScrewMaster]

Me. I've just had vsdl service installed, which utilizes QWest's FTTN(Fiber To The Node) service. The DSLAM is about 2 blocks away from my house. I'm getting 20mbit down/5 mbit up. It's awesome. I see it as the future of DSL, simply bridging the last mile problem from fiber nodes.

I'm on U-Verse, and have been very pleased with it. U-Verse is also VDSL, and while it's no gigabit connection it works very well. Somewhat ironically (well, irritatingly) there's an AT&T VRAD right across the street from my house, not fifty feet away. But I'm not connected to it: I'm running from a box down on the main drag, maybe a mile away. I'm currently on the 12 mbit/sec plan (saved a few bucks) but I get about 15 which is fine for me, and when I first got it I was rated at 18 mbit/sec, and was getting a solid 22. Not bad for phone wiring. Plus which AT&T gives me a 2 mbit/sec backchannel, which I find very useful (compared to the 30 or 40 kbit/sec up I got from Comcast, when I was on their 20 mbit/sec plan!) And it's consistent, usable bandwidth in both directions.