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DSL/vectoring/G.fast

Ericsson: We Can Do 500 Mbit/s Over VDSL2

Here's an announcement that should raise some hackles within the broadband access community: Ericsson AB (Nasdaq: ERIC) says it can deliver downstream broadband access speeds of more than 500 Mbit/s using VDSL2-based technology. (See Ericsson Claims VDSL2 Breakthrough .)

That's quite the claim, given that VDSL2's top end speed under optimum conditions is 100 Mbit/s downstream and upstream, and delivers around 40 Mbit/s under real-world commercial deployment conditions.

So what's behind Ericsson's claim?

Well, Ericsson says it achieved downstream data transfer rates of more than 500 Mbit/s under lab conditions using line bonding and crosstalk cancellation techniques, known as "vectoring," to boost the potential capacity of the broadband connection.

Ericsson bonded six copper pairs and achieved its headline-grabbing speed across a 500-meter connection using spectrum up to 17 MHz, the vendor's head of product marketing for broadband networks, Don McCullough, tells Light Reading.

McCullough said the same techniques were used on longer connections, up to 1,200 meters, but wouldn't disclose the results.

And what about upstream? While Ericsson says the speed "could in principle be symmetrical," the company didn't use any vectoring in the upstream, though it believes such a test could deliver "at least" 125 Mbit/s across six bonded copper pairs.

Crosstalk cancellation
This technique reduces the "noise" from other copper pairs that interferes with, and reduces the reach of, a DSL connection. Ericsson says it used a VDSL2 reference design chipset with integrated crosstalk cancellation capabilities, and that the specific noise reduction technology deployed is currently going through the standards process at the International Telecommunication Union, Standardization Sector (ITU-T) , where it's known as G.vector. (The standard is scheduled for "consent" at the ITU-T in October this year.)

Pre-standard G.vector technology is just one of a number of approaches used to boost the capabilities of DSL lines. Last year Alcatel-Lucent (NYSE: ALU) unveiled a technology it calls SmartDSL, while multiple vendors, including AlcaLu and ECI Telecom Ltd. , have been investigating the potential of Dynamic Spectrum Management (DSM), a technology that can eliminate crosstalk. (See AlcaLu Develops 'SmartDSL' and DSL Group Forms.)

Specialist vendor Assia Inc. , which is headed by DSL guru John Cioffi, is the leading light in the DSM world. (See Sky Deploys Assia's DSM, Assia Makes DSL Greener, and Valley Wonk: DSL Man.)

Line bonding
For the line bonding techniques, Ericsson deployed a "self-developed implementation and designed the corresponding CPE [customer premises equipment] solution," according to the vendor.

Ericsson says its Ethernet-based multi-pair bonding technology is based on ITU-T specifications described in the recommendation G.998.2, also known as G.bond. [Ed note: This ITU-T recommendation was played by Sean Connery in the 1972 movie You Only Line Bond Twice.]

Line bonding is a technique commonly used by the Ethernet-in-the-first-mile specialist vendors such as Actelis Networks Inc. , Adtran Inc. (Nasdaq: ADTN), Aktino Inc. , Hatteras Networks Inc. , RAD Data Communications Ltd. , and Zhone Technologies Inc. (Nasdaq: ZHNE). (See Ethernet Access Market Update.)

What's next?
Ericsson says it doesn't have any carrier trials in progress or lined up, and that commercial availability of the technology used in this lab trial will "depend on customer demand."

And McCullough recognizes that lab conditions are different from real-world conditions. "In the real world there are different size bundles, and different qualities of copper plant," he says, though he believes there will be interest in what Ericsson has been doing from carriers in Latin America, Asia/Pacific, and Europe, where "there is a strong desire to use fiber-to-the-building [FTTB] and VDSL2 over copper [within buildings to the customer] -- there is copper installed and out there for VDSL2."

Heavy Reading chief analyst Graham Finnie, who has been immersed in high-speed access strategies and technologies in recent months, doesn't believe there will be much in the way of demand. "Six bonded pairs! That immediately says 'niche' to me," says the Brit, who believes such deployments will only be considered where fiber access deployment is too difficult to consider. (See FTTH Europe: Slow Growth Forecast.)

Ericsson is keen on fiber access too, of course, having splashed out $290 million in early 2007 buying GPON specialist Entrisphere: The Swedish giant is also sinking R&D dollars into future access technologies such as WDM-PON and 10-Gig PON. (See Ericsson Joins Cost-Cutting WDM-PON Team, GPON Gets a 10G Look, and Ericsson Buys Entrisphere.)

— Ray Le Maistre, International News Editor, Light Reading

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paolo.franzoi 12/5/2012 | 4:08:59 PM
re: Ericsson: We Can Do 500 Mbit/s Over VDSL2


 




So, let me get this right.-á We are now thinking that it is wonderful to bond 6 pairs to get high rate DSL for in building distribution.-á Really Don?-á Come on buddy.-á You can spin better than that.-á Riddle me this batman....How many buildings pull 6 pairs to every apartment?-á None sound like a good answer?-á If you are going to have to put more copper in the riser (which is why you would do VDSL2 distribution in the first place to not run new plant within the building),-á you are a lot better off running fiber up the riser.




Heck - I can run 1 Gb/s over copper with a pluggable interface! -á




seven




 


bitsarebits 12/5/2012 | 4:08:59 PM
re: Ericsson: We Can Do 500 Mbit/s Over VDSL2


> How many buildings pull 6 pairs to every apartment?-á


That will depend on where you live. I live in CA. Recently, to my surprise, I found that there are 6 pairs to my house. (I lived in a small house). I did not know when AT&T or its precedent pulled those many pairs to a single house.
bitsarebits 12/5/2012 | 4:08:58 PM
re: Ericsson: We Can Do 500 Mbit/s Over VDSL2


Ericsson used 6 pairs. In theory, you can do better than that, 4 pairs will do the trick,




http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=4303358




so there is still room for improvement.


paolo.franzoi 12/5/2012 | 4:08:58 PM
re: Ericsson: We Can Do 500 Mbit/s Over VDSL2


 




There are 6 pairs to the pedestal on the street - not 6 pairs in the loop.




 




 


t.bogataj 12/5/2012 | 4:08:57 PM
re: Ericsson: We Can Do 500 Mbit/s Over VDSL2


bitsarebits: "so there is still room for improvement"




A lot of room for improvement: the target is 100 Gbps (sic!). (You just need to be a believer.) In case you haven't read the June 2007 issue of the IEEE Communications Magazine, do so now.




CuPON: The copper alternative to PON 100 Gb/s DSL networks




Nice reading,




T.


digits 12/5/2012 | 4:08:56 PM
re: Ericsson: We Can Do 500 Mbit/s Over VDSL2


So, following the inclusion of the following paragraph in this article:




Ericsson says its Ethernet-based multi-pair bonding technology is based on ITU-T specifications described in the recommendation G.998.2, also known as G.bond. [Ed note: This ITU-T recommendation was played by Sean Connery in the 1972 movie You Only Line Bond Twice.]




Ericsson has been in touch.... They want to suggest alternatives, namely




CopperFinger




and




The Fiber Is Not Enough




Any other suggestions?




Ray


DCITDave 12/5/2012 | 4:08:55 PM
re: Ericsson: We Can Do 500 Mbit/s Over VDSL2


FDR promised 6 pairs to every apartment and a chicken in every pot.




But that was then...


fiber_r_us 12/5/2012 | 4:08:55 PM
re: Ericsson: We Can Do 500 Mbit/s Over VDSL2


Copper are Forever




Fibre Another Day




Dr. No Fibre




For Your Pairs Only




From Sweden with Love




Copper Eye




License to Kill Fibre




Live and Let Fibre Die




Man with a Copper Pair




Never say Fibre




Octocopper




Copper Never Dies


paolo.franzoi 12/5/2012 | 4:08:54 PM
re: Ericsson: We Can Do 500 Mbit/s Over VDSL2


 




I find all of this stuff hysterical.-á Go get a DSL line to work at its defined rates with noise present in real loops and we can start to talk.-á Now do it with a 10-12 BER so that we can have nice clean HDTV streams.




At some point, you have to have lots of electronics close to the customer to do this.-á This presents all kinds of challenges that basically get removed when you run fiber. -á Once you are within a few hundred meters of the end consumer one really has to look at the investment model.-á Apartment buildings are one thing where you can put a bunch of equipment in a basement and use the existing plant to achieve something.-á Single Family Homes are quite another, where distances become so short that you have to have one piece of electronics per 2 - 4 homes (1 per home in large lots). -á




People can then argue whether a point to point or a point to multipoint architecture is better, but DSL is deader than a doornail going forward in to the long future.-á Even AT&T has to ponder whether U-verse is going to really work for them.




seven




 


opticalwatcher 12/5/2012 | 4:08:54 PM
re: Ericsson: We Can Do 500 Mbit/s Over VDSL2


One Pair is Not Enough




 


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