Who needs fiber? Backhaul By a Dozen Bonded DSLs

aries 2 pair bond12 bonded lines of 35b VDSL should be able to deliver 2 gig downstream ~400 meters. That's comparable to the most common G.fast backhaul, 2.4 gig GPON. Telcos are confident few will use the high speeds simultaneously so the high over-subscription is realistic. Upstream on the older DSLs is lower, so the upstream will probably be limited.

Kurt Raaflaub says Adtran has trial units at customers. As far as I know, this is the first public description of bonded 35b and I hadn't anticipated this possible use. Deutsche Telekom says 35b will be ready for deployment the second half of 2018.

Read more ...

Terabit DSL for the Interested Layman

Use the plastic sheathing around the phone wires as a waveguide. With 1,000x more spectrum, you get 1,000 more speed. Glass fiber optic waveguides can carry 250 terabits. John Cioffi wants to apply similar techniques using the air gaps between the plastic surrounding a billion phone lines.

The proposed terabit DSL can use 300 GHz+ of spectrum, "submillimeter waves." Current DSLs use 100-500 MHz. Higher frequencies just wouldn't make it through a standard copper wire. The signals get weaker (attenuate) very quickly in copper. 500 MHz can only carry about 30 meters. Gigahertz, even less.

Cioffi proposes using the tiny air spaces between the plastic insulated wires as a "waveguide." The signal would travel over the air gaps, not the copper or plastic. Fiber optic, glass or plastic, "guides" the waves; why couldn't the plastic insulation do similar? (The waves are very, very small. They can easily fit in the gaps.) The signal is carried through the air between the wires, not on the copper wires.

Read more ...

Terabit DSL. The Technical Presentation and the Announcement

Nobody's built a demonstration unit yet, but numerous very respected engineers are impressed by the concept. Using submillimeter frequencies, the telephone binders as waveguides, and massive calculations for "noise cancellation," speeds as high as a terabit should be possible.

Those specifications are at or slightly beyond the state of the art, so building the first unit is still to come. With support, Cioffi believes it can be done in just a few years and commercially soon after. That remains unproven but the industry is alive with enthusiasm.  Technical presentation .

Terabit DSL Proposed By Stanford Professor John Cioffi

One Terabit 100 meters, 100 Gigabits 300 meters, 10 Gigabits 500 meters 

Read more ...

Bharti reaches 2M VDSL but India will always be a wireless network

Reliance-Jio-pricing.-200jpg200M wireless, 2M wired. Reliance just signed up 100M 4G subscribers in six months; India is likely to pass the U.S. in broadband connections by the end of the year. About 15M of those have DSL, mostly from government owned BSNL & MTNL. Bharti, which is the fourth largest telco in the world, has just connected DSL customer two million. The current offering is VDSL, which they sell as the misleading, "up to 100 megabits." I haven't found any evidence of vectoring nor a breakdown of actual speeds or distances. Based on the British experience, that means most customers will get 10 megabits to 50 megabits. They call it V-Fiber, a marketer's fantasy.

Reliance Jio is currently running fiber home, designed for a gig but apparently mostly sold at 100 megabits.

Read more ...

Unbundling obsolete in the age of vectoring: an inconvenient truth

Sharon White can raise Internet speeds across Britain by 100 megabits with smart policy.  British Telecom, Vodafone, Sky, and TalkTalk would all benefit if White gets this one right. More important, the Brits get a much better Internet. The only losers would be John Malone's cableco and the now outdated policy for sharing of the binder. (BT has promised 10M lines of G.fast at speeds of 200-800 megabits. My examples here are from Britain, but other countries will face similar issues.)

Competition doesn't have to die. It does have to move from the cable to the exchange. Unbundling was a great idea in 2000 and is the main reason European broadband is 30-70% cheaper than American and Canadian. The 25 or 50 twisted pairs that run together from the exchange could be split between several carriers and performance was unaffected.

Future competition will require BT's local loop monopoly to hand off to others at the local exchange at the right price. The "right price" would include a profit proportionate to the investment. BT would be welcome to recover costs plus a profit; regulated prices would prevent exploitation of the monopoly.

That was the near-ubiquitous model for unbundling until recently. Currently in the EU, monopolies are being allowed to charge far more, after Kroes and Richards were blinded by a lobbying campaign brilliantly orchestrated by Luigi Gambardella.

Read more ...

AT&T's $10 for the poor. Thank you Jim, Ralph, Randall, John. & John

Scrooge Verizon! AT&T did the right thing, offering $5 and $10 packages for the poor. Anyone in the food stamp program qualifies. Speeds are 10 megabits down where AT&T can deliver that speed, ~75% of their homes. It's 3 megabits or 5 megabits where that's the fastest AT&T can provide. Where AT&T doesn't have DSL (about 10%,) they do not offer discounted wireless. Of course a higher speed is preferable, but this is decent for a basic service. About 40M Americans are eligible for food stamps. More than a third of them live in AT&T territory.

With HD TV looking pretty good these days at 3 megabits, people will be able to access 90% or more of all Internet functionality. The main thing that is impractical at those speeds is keeping lots of music and video in the cloud. I'm finding that very convenient, especially because Amazon offers unlimited storage for $55.year. I have 6 terabytes now backed up. 

Read more ...

G.fast comes of age with 10M lines for Britain

Usain bolt by drcliffordchoi 320

It works, finally. As always, the telcos were cautious and the vendors promised too much. The dam has broken now, with BT going at 3M homes passed each year. http://bit.ly/BThalffast CEO Patterson will keep going until “almost all” Brits can get what he’s calling ultrafast broadband.

AT&T looks to be the next big order, millions of lines with fiber to the basement and G.fast to each apartment. http://bit.ly/GfastATT. Chunghwa in Taiwan is covering almost the entire country. In Australia, Parliament is debating how much of the National Broadband network should switch to G.fast. Rio de Janeiro, Panama, Belgium, and Switzerland are on the way.  

Much more at Gfastnews.com

"Yes you can unbundle G.fast and vectored DSL!" - John Cioffi

Software unbundling could add 100 megabits to typical speeds in England. BT has just committed to 10M lines of G.fast in the next four years and "most of the country" soon after that. They are talking speeds of "up to 330 megabits" rather than the 500-800 now proven for G.fast from the local distribution point. Instead, they will put the DSLAMs in existing cabinets and save. 

Cioffi, who invented vectored DSL, believes using software unbundling would allow 100 megabits faster speed. Alternatively, you can extend the reach at a given speed. Traditional unbundling shares the physical lines in the bundle. Today's technology - vectoring and G.fast - provides much higher speeds but is very sensitive to other signals in the same bundle. The incumbents are saying hardware unbundling is now undesirable. They prefer to control everything and sell bitstream access.

ASSIA's multitenant software allows multiple companies to manage the parameters for each customer and troubleshoot many problems, The carrier would manage the physical network including the vectoring noise cancellation. Each company would have a management console and could support their own customers directly.  

BT's current plan is to run G.fast in frequencies from 22 MHz to 106 MHz. That leaves 0-17 MHz for other companies running older VDSL on unbundled loops. If the companies could agree that all would use the BT G.fast local loop, British homes would get 100 megabits more speed. BT would be able to use frequencies 2 MHz to 106 MHz rather than 22 to 106 MHz

Read more ...