Global Sources
EE Times-Asia
Stay in touch with EE Times Asia
?
EE Times-Asia > Networks
?
?
Networks??

G.fast gets green light from telecoms community

Posted: 17 Dec 2014 ?? ?Print Version ?Bookmark and Share

Keywords:G.fast? 1Gbit/s? FTTdp? BBF?

The reality is current technology, VDSL and VDSL2 using vectoring, has already boosted speeds to 100Mbit/s in fibre-to-the-cabinet (FTTC) deployments. Still using vectoring, G.fast will take this to the next level in terms of speed, but the proposed architecture will force operators to move their fibre plant even closer to the customers' distribution point.

It also needs stressing that for many operators G.fast will need to coexist with VDSL or VDSL2. While this is taken into account in the physical layer standard just approved, and has been demonstrated to be technically feasible, it does reduce the bit rates by an estimated 20 per cent at relatively short loop distances from the street cabinet, and if these are higher, data rates can reduce significantly.

So the likelihood is G.fast will clock in at less than the headline data rate, but still sufficient for super-fast broadband services. And, importantly, at rates able to compete against cable operators deploying DOCSIS 3.0 technology, if not the emerging DOCSIS 3.1 specification.

On the cost side of the equation, and hardly surprisingly since its fate hinges on a speedy roll-out of Gaits, Sckipio recently suggested the cost per home of deploying G.fast "over the last 200m" would be just $300, while that of FTTP works out at nearer $1,500.

The end game, of course, is fibre directly into homes (FTTH) so the cost analysis for operators will be: yes, G.fast will help us get there, but it is an interim step, so is it really justified?

The most likely scenario is that in some markets, G.fast is unlikely to find much favour, whereas in others, for instance where the infrastructure is such that it is very difficult to get fibre into a home or office, it could play a significant role.

So while G.fast certainly brings a new twist to the twisted pair, and will clearly extend telcos' options as they upgrade their fixed access networks, it is by no means the end of the line.

- John Walko
??EE Times


?First Page?Previous Page 1???2



Article Comments - G.fast gets green light from telecom...
Comments:??
*? You can enter [0] more charecters.
*Verify code:
?
?
Webinars

Seminars

Visit Asia Webinars to learn about the latest in technology and get practical design tips.

?
?
Back to Top