Alcatel-Lucent sets record of 10 Gbps over traditional copper telephone lines
alcatel-lucent.com
alcatel-lucent.com
Nice intro to the theory around data transmission limits: http://newsoffice.mit.edu/2010/explained-shannon-0115
It's also totally unlimited, with no FUP - I've pulled down many hundreds of gigabytes per month (I work with very large data files and often work from home) and not heard so much as a peep from them about it.
http://www.productsandservices.bt.com/products/broadband/fas...
30 meters with bonded pair for 10 Gbps. While this is pretty cool, due to distance limitation we are not getting telephone line modems that can outstrip fiber optics.
From the article:
"XG-FAST can help operators accelerate FTTH deployments, taking fiber very close to customers without the major expense and delays associated with entering every home."
So you actually are getting a modem, hooked up to your telephone line, that goes up to 70m over telephone cable to the street, and then fiber the rest of the way. Makes a lot more sense than literally doing fiber to every home.
This is exactly how AT&T Uverse works in brownfield retrofits.
Btw Cab is UK tlco slang for it not sure what the USA Telco term is
At the point you're doing that, the marginal cost of getting them there is much higher then the cost of the equipment or cabling they'd be installing.
Digging up people's front lawns requires permission from every homeowner, and if you are offloading cost you have to bill each homeowner...
But none of this would make sense or is in any way indicative of the pile of shit the coalition is set to be responsible for here in Australia, lest anyone think that.
I doubt anyone is under any illusions that the copper is going to outstrip fiber. However, it is still an important result: There are many places that are stuck with old-fashioned twisted pair and it takes literally an act of gov't to lay down fiber. Rather than leaving that population out in the cold, this result gives hope that they may have cutting edge connectivity.
The real issue is commercializability, which has not been Bell's traditional strength.
Because DSL operates above the 3.4 kHz voice limit, it cannot pass through a load coil. Load coils are, in essence, filters that block out any non-voice frequency. They are commonly set at regular intervals in lines placed only for POTS service. A DSL signal cannot pass through a properly installed and working load coil, while voice service cannot be maintained past a certain distance without such coils. Therefore, some areas that are within range for DSL service are disqualified from eligibility because of load coil placement. Because of this, phone companies endeavor to remove load coils on copper loops that can operate without them, and by conditioning other lines to avoid them through the use of fiber to the neighborhood or node
This is for fiber to the premise, not fiber to the node. It would have solved some of the problems with the old NBN model, especially in highrise buildings in the city.
I'm simply for this by the fact the government has been progressively removing all technical references about the NBN from every government website. During their election they promised a climate controlled box every 500 meters or so. This was ridiculed as completely out of the question due to cost and maintenance and has been quietly dropped since then. So even at the best case scenario the distance will be x20 as long as in these trials. And as the researchers noted: "giving broadband speeds up to 500 Mbps over a distance of 100 meters. In contrast, XG-FAST uses an increased frequency range up to 500 MHz to achieve higher speeds but over shorter distances."
It's about squeezing more out of the existing copper to the premise, while we wait for fibre to arrive.
"a major business benefit in locations where it is not physically, economically or aesthetically viable to lay new fiber cables all the way into residences. Instead, fiber can be brought to the curbside, wall or basement of a building and the existing copper network used for the final few meters."
I interpreted "the premise" as the building, but perhaps the conventional interpretation is the entire grounds. Either way, this is certainly about squeezing more out of the existing copper.
It is absolutely useless for the 1km+ distance to exchanges common in cities and 10km+ common in rural settings.
Instead the premises will have in the pits (or on one of the electricity poles) just outside them a tiny box - powered from the household itself through the existing copper - that connects to the fibre, which runs past the household. This contrasts with the average distance to the nodes of about three, four hundred metres likely under what the coalition is doing.
It gets rid of the most expensive part of a FTTH install, which is the actual connection to the customer. So, yes, it's viable.
It's also, however, substantially more like Labor's plan than the coalition's. So even if it were to make a buttload of sense and be insanely more cost effective it still wouldn't be done because Labor is evil. Or something. And Telstra and Murdoch wouldn't approve of something like this.
I bet this isn't that much cheaper than a full FTTH - the cost advantage of DSL is eroded as the port density goes down.
The greatest breakthroughs provide something for the masses at a lower cost than previously possible. An important part of engineering is leveraging existing infrastructure to improve service quality. As an example of this it has been technically possible to put fibre into every home for years but apparently not feasible, price-wise. Speed is speed whether it's copper or fibre.
G.Fast, is suppose to be a FTTdp, where fibre goes all the way to your building and replacing the central copper wiring box with its DSLAM. In countries where you have many flats within a building, it is likely the copper wiring to home socket are all within 100M range.
I am not sure this applies to every scenario in every countries. But the concern of Copper quality is mainly a problem with copper outside of the building. Copper within the building are in much better shape and form.
G.Fast also allow operator to config the upload and download speed. Hopefully that means at least 100Mbps of upload speed in the age of cloud computing.
I cant wait to see this deploy. No longer would teleco needs permission and planning to work around every home and every building to get high speed internet.
Huawei and Alcatel-Lucent are the fore front in G.Fast technology.
This system will face the same problems as BPL, only much, much worse.
The truth is that you can't reuse the (all ready full) radio spectrum, especially over copper.
The only way you can do it is with well shielded Coaxial Cable (eg Cable TV) or via light (eg Optical Fiber).
It's a triumph of Sales people over Engineering. Or to put it another way, the laws of physics will always win.
I would have thought homeowners and businessowners alike would spend the money to upgrade their own "infra" to make that work, rather than something like this. Obviously AL thinks there's a market here, it just seems like such a waste.
The coax drop from Comcast drapes off the pole, hits little more than a barrel connector on the side of the house, and then comes straight in the house and plugs into the modem.
Why can't you do the same with fiber?
[1] - http://www.aflglobal.com/Products/Fiber-Outside-Plant/OptiNI...
A good book on the subject is Gleick's The Information http://www.amazon.com/The-Information-History-Theory-Flood/d...
Alcatel-Lucent and BT said speeds of 1.4 terabits per second were achieved during their joint test - enough to send 44 uncompressed HD films a second.
Awesome!
Doubt it. But it is a nice achievement.
Not just by a small factor, but at that speed you're likely to be around two orders of magnitude too far away for this be in any way useful due to the attenuation inherent in your copper line.
The only way this latest increment is useful is to bring fibre in your case about 99% of the way to your household. This will bridge the last 1% because it's cheaper than running fibre into your household.
> It will enable operators to provide Internet connection speeds that are indistinguishable from fiber-to-the-home services, a major business benefit in locations where it is not physically, economically or aesthetically viable to lay new fiber cables all the way into residences. Instead, fiber can be brought to the curbside, wall or basement of a building and the existing copper network used for the final few meters.
> XG-FAST can help operators accelerate FTTH deployments, taking fiber very close to customers without the major expense and delays associated with entering every home
Digging up everyone's yard, replacing lines that might now be running under garages or driveways, and just generally having to operate in people's yard is a lot more work. Especially multiplied by tens or hundreds of thousands of homes.
If you can just trench an alley and run fiber to the nodes then re-use the existing copper for the last 100m that's probably a huge cost savings.
edit: Yep - rural electrification was pretty much completely government driven[1]
[1]https://en.wikipedia.org/wiki/Rural_electricity#United_State...
Anyway, looks like they were interest free loans vs. outright subsidies. At least something came out of the New Deal, whereas fedgov spending during this recession is pissed away.
[1] http://en.wikipedia.org/wiki/Broadband_universal_service#Uni...
On the other hand, give fast track regulatory approval for poles and right-of-ways to ISPs for fiber infra and you can wire a whole town, and let the library pay for their 100Mbps line like everyone else. Bet you that library ends up with a properly sized $100 SOHO router and a $100/mo broadband plan if they have to pay for it out of their books budget.
I think at least one side of the equation or 'market' has to be driven by someone who is paying with scarce money, not just Benjamins hot off the presses, to keep things under control.
For the same frequency ranges as ADSL2+, VDSL2 delivered pretty much no improvement. What VDSL2 did do is expand the frequency range up to 17 MHz/30 MHz, depending on the profile.
So the question you might want to ask is "How high a frequency can we use?" and in that case the real question you're looking for is "How short a piece of copper do you have?".
And the answer to that is very quickly becoming "a very short piece of copper indeed".
Either that or a lot of copper that's ideally also very thick... which, considering most copper was rolled out with the aim of providing a low attenuation at 3000 Hz over at most a low number of kilometres isn't often the case.
tl;dr: How long is a piece of string?
Depending on these parameters, power, bandwidth, and signal to noise, the bandwidth can be arbitrarily high (subject I suppose to quantum effects). See: http://en.m.wikipedia.org/wiki/Shannon%E2%80%93Hartley_theor...
This system uses a bandwidth of 500 MHz over two pairs. That gives roughly 10 bits per second per hertz. Both are pretty close to the state of the art over unshielded copper cable. You coaxial cable is usually about 600 MHz. But if you use waveguides and the like, you can get into the GHz range.
And in the long term, you'd probably pay to replace this yourself with fibre since (if other high bitrate copper solutions are any indication) fibre would be lower power, lower maintenance and more reliable.
We have a failed government with incompetent and neutered regulators and legislators that are operating in a system that is so deeply corrupt that the best of intentions cannot generate any kind of real momentum. There really needs to be a focus on bifurcating the infrastructure from services. What is wrong with us that we pay taxes to pay for functions of government when all that happens is that those taxes go to subsidizing the privatization of government services and then being overcharged by that very private sector we stood up.
Infrastructure is a core function and purpose of government, without it being under socialized responsibility and control there is no purpose for government.
Another example that is so blatantly obvious but no one seems to see for all the trees is electronic payment processing; why is there no almost zero cost electronic payment infrastructure that essentially serves the same purpose as paper money. I am not at all for the abolition of paper money, especially in light of the reminder that government is not our friend or anyone's friend but its own, but there should be a government / public infrastructure for payment processing. It's actually rather shocking that there is no such system and it is purely corruption of the worst kind that is preventing it.
Ever wonder why it is rather difficult to use a Visa/MC/AE in Germany, it's because the electronic payment / money system is a pseudo public infrastructure and highly regulated. There is no money to be creamed and siphoned off of the economy by the big payment processors.
Something the startup community does not take into account is that it is only as successful and has as much wiggle room as the big cartel controlled sectors permit. So you built a service or a product, you're just mucking around while you still have to pay protection money to the mob.
Sometimes I wish that efforts like Dwolla would gain a lot more traction. Their payment processing fee is fractions of the extortion of the mob, yet they can't seem to catch on. What is wrong with us, why would we be ok with having your profits siphoned off? Those huge payment processing fees are profits that you pay for not good reason.
The same problem affects this technology, there is absolutely no reason for any ISP to implement this technology any time soon. They get away with extortion for shitty services, why would they provide exponentially faster service for anything but a lot more as they seesaw up expectation that "of course, it's faster so I should pay more"
No thanks, I would much rather have direct control over my own home network. (Sure, you could achieve that with a repeater in your home, but then what was the point of moving the Wi-Fi router to the street?)
My home PC is hooked up to my router with a CAT6 cable. The router is hooked up to the FTTH modem with another CAT6 cable. So it's hard lines all the way. Both the speed and latency of this setup are much better than anything I ever got with any wireless alternative, especially when I'm trying to talk with other devices on the other side of a wall or two.
Who will be happy to charge you by the number of devices you can connect.
ISPs (used to) do that. The solution has always been to use your own router in front of the modem. Sounds like a similar solution would work here.> (Sure, you could achieve that with a repeater in your home, but then what was the point of moving the Wi-Fi router to the street?)