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Bell Labs Hits 10 Gbit/s Broadband Over Copper
7/10/2014

Bell Labs' new XG-Fast carries broadband frequencies over copper from the curb to the residence at 1-to-10 gigabit per second broadband speeds.
Bell Labs' new XG-Fast carries broadband frequencies over copper from the curb to the residence at 1-to-10 gigabit per second broadband speeds.

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Loperman
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G Fast Details
Loperman   7/10/2014 2:08:23 PM
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anything new or exotic about the G Fast electronics?

R_Colin_Johnson
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Re: G Fast Details
R_Colin_Johnson   7/10/2014 2:30:23 PM
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G.fast is an acronym for Fast Access to Subscriber Terminals and its main purpose is just that--to get higher speeds from digital subscriber lines (DSLs). It is modeled on Very-high-bit-rate digital subscriber line 2 (VDSL2) which was designed to get high-speed data over the copper telephone wires already in older buildings (VDSL2 was defined as standard ITU-T G.993.2 in 2005.) The only thing exotic about G.fast is its promise of 200-to-500 megabit per second speeds for DSL.

Tibor.boros
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Spectral Efficiency
Tibor.boros   7/12/2014 1:12:14 PM
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It seems the spectral efficiency without bonding (1 pair) is 5.7 bps/Hz, while with bonding (2 pairs) it is 10 bps/Hz. What's the catch? Distance (70m vs. 30m)? I would still not expect such a big difference.

R_Colin_Johnson
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Blogger
Re: Spectral Efficiency
R_Colin_Johnson   7/15/2014 2:32:15 PM
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I asked your question ("What's the catch?") to the Bell Labs experts and this is what they said: "Distance is one part of the answer; we're also doing some undisclosed optimizations to get the most out of the 2-pair/30m case."

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