Print 32 comment(s) - last by skyyspam.. on Oct 29 at 9:41 PM

1Gbps over DSL copper lines may be in our future
Realistic connectivity with DSL will be in the 390Mbps range

Broadband speeds for internet users in America are often woeful in comparison to the speeds found in other countries around the world. The FCC is working hard to get faster broadband connections all around the country, especially to the poor and those that live in rural areas.

Vendors are also working hard to increase the speed of our web connections using existing methods while other firms work on faster speeds with new technology like fiber optic and wireless connectivity. Today, the majority of fixed-line internet is served by copper cables that have been around for decades.

As various vendors that make the hardware that allows broadband over cable wires using DSL technology make technological breakthroughs, the speeds consumers can get are growing. Nokia Siemens recently announced that it could transmit data at up to 825Mbps using copper wires for a distance of 400 meters. Huawei has also announced that it has been able to transmit data at up to 700Mbps over the same distance.

The fastest speeds in tests have been from Alcatel-Lucent with the ability to send data at 910Mbps over 400 meters. These fast speeds are achieved using different methods. One of the methods reports
PC World is VDSL2 (Very high bit-rate digital subscriber Line) that sends data over several copper pairs at one time. The VDSL2 method also uses DSL Phantom Mode to create a third virtual copper pair to send more data over along with the two copper pairs.

Phantom Mode reportedly causes crosstalk that the vendor then has to eliminate using noise canceling tech very similar to the tech used by noise canceling headphones. The tech monitors noise on the copper pairs continuously and generates its own signal to cancel the noise out. The vendors getting some of the highest speeds are using copper wire with four pairs inside, but that wiring is not readily available making the dual pair approach more realistic. 

Sending data across two copper pairs is good for data speeds up to 390Mbps over 400 meters and vectoring can increase that distance to 1,000 meters. Products using these new techniques are starting field trials with providers now and should be in the commercial space for consumers next year.

Fiber optic web connections are already available at 1Gbps speeds in some areas.

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RE: Brilliant, just what we need...
By theapparition on 10/27/2010 11:08:12 AM , Rating: 2
How many people live within 400 meters of a central office either, or 1000 meters?

This is just lab tech that will no doubt improve current DSL offerings, but by the time that happens, Fiber will be pushing true 1Gbps and beyond.

RE: Brilliant, just what we need...
By Hyperion1400 on 10/27/2010 1:34:05 PM , Rating: 2
It's not you distance to the office that matters, it's your distance to the callbox. Which, if I remember correctly, is >3 kilometers for almost all DSL subscribers. Once your signal reaches the callbox it's almost unimpeded at that point until it reaches the central office.

Now, even though a bunch of people most likely live outside the 1k boundary, I have no doubt that telco's could offer a scaled down version of this service(say on the order of 100mbps) to those living on the outside of the 1k boundary.

RE: Brilliant, just what we need...
By wempa on 10/28/2010 12:22:01 PM , Rating: 2
Regardless of whether it's the CO or the callbox, the fact that DSL is so distance-sensitive is a major issue. Back when it first came out in NJ and I looked into it, I found that I was like 20000 feet away and therefore, unable to get the service. I had to wait a while longer before cable modems became available in my area.

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