To To http://www.extremetech.com/extreme/186011-10gbps-over-a-copper-telephone-line-a-new-world-record-set-by-bell-labs The telecommunications master of Bell Labs managed to achieve a world record connection speed of 10Gbps (10,000Mbps) through copper wire. The new technology called XG.fast can be used to extend the life of existing copper wire networks on a large scale, providing telecommunications companies with an alternative to laying expensive fiber optic networks for billions of homes that already have telephone lines. But more importantly, it may mean that you finally got a serious upgrade from a ~10MbpsADSL or ~50MbpsVDSL connection. Bell Labs, now the R&D department of global telecommunications giant Alcatel-Lucent, developed XG.fast as an extension of G.fast. G.fast is the successor to VDSL2-VDSL2 is the technology used in most FTTC (Fiber to the Cabinet) installations worldwide. When used with FTTC, the speed of VDSL2 is as high as 150Mbps, the speed of G.fast is as high as 1.25Gbps, and the speed of XG.fast is from 2Gbps to 10Gbps. If you open a manhole, you will see a large telephone line like this with hundreds of telephone lines on it Like the new copper wire technology, the huge speed of XG.fast is mainly due to its use of a larger frequency range. VDSL2 only uses 17 or 30MHz spectrum blocks, while G.fast allows up to 212MHz, while XG.fast uses a large 500MHz. It is almost the same as WiFi: you can only compress a lot of data into the small 20MHz channels available in the 2.4GHz band, but you can squeeze more data into the 80MHz and 160MHz channels available in 5GHz. However, the problem with squeezing 500MHz on the copper wire is that higher frequencies will decay (weak) quickly. Add crosstalk (interference from the other copper wire in the twisted pair), and your effective range will be very short. For VDSL2, if 150Mbps is required, the maximum line length is about 400 meters; for 1.25GbpsG.fast, the maximum distance is reduced to 70 meters. For 10GbpsXG.fast, the maximum distance reported by Bell Labs is only 30 meters (100 feet). For the slower version of XG.fast, the symmetrical clock is 1Gbps (total 2Gbps) and the distance managed by the researchers is 70 meters (230 feet). Nevertheless, 100 feet is still much better than the alternative of laying fiber into someone's home (FTTH). The time, energy and money required to lay a new fiber optic cable in billions of homes is almost daunting. If most houses in the world already have a pair of copper wires, why not use them? [Read: The fastest wireless network in the world can reach 100 gigabits per second, which can be expanded to megabits. However, don't expect 10Gbps/10,000Mbps connections anytime soon. The further development of FTTC and VDSL2, followed by G.fast (which is being approved by the ITU) is the next step that will be introduced by the ISP in the next few years. G.fast and its 1Gbps promise will require fiber to be closer to home—perhaps FTTdp (distribution point; under the sidewalk or on a pole), so it will cost a lot of capital expenditure. XG.fast will almost certainly require FTTB (Fiber to the Basement), although FTTdp is possible in some cases. [Read: The secret world of submarine cables. ] In the final analysis, these are all just expedients. So far, the best solution is to deliver fiber to everyone’s home immediately. Of course, this will cost billions or trillions of dollars, but ISPs should consider their own problems and future development now, rather than constantly piece together to keep up with scattered patches and updates. Sadly, unless the government provides huge funds, things rarely happen in this world. <br>
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Netizens reply: To To The loss is too large, just a laboratory product. It is better to change the optical fiber, it is cheap and universal
Netizens reply: To To It doesn't make sense, it has been eliminated! the cost is too high!
Netizens reply: To To What kind of stuff? I thought that the 10M coaxial LAN can be upgraded directly after changing the protocol. So much money for replacing the 100M LAN cable 20 or 30 years ago was spent in vain
Netizen reply: To To It was said before that the last mile was the hardest, but now it has become the last 70 meters?
Netizens reply: To To There is no application scenario for a distance of tens of meters. German NetCologne has obtained 1Gbps G.fast from the corridor to the home. Technically speaking, there is G.mgfast, but the shortcomings are that the distance is shorter than FTTH in one step.
Netizens reply: To To It’s just that it’s okay to have fiber to the home for so many years, and I don’t feel how expensive it is, but foreign operators treat individual users more harshly
Netizen reply: To To The domestic cost of entry is not bad at all. There are not many broadband installed in a small residential area. Unicom broadband directly installed a line on each layer. .

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