[AusNOG] DSL G.Fast Details

[Mark ZZZ Smith]

>From March last year -

"The FTTdp technology option for the Australian National Broadband Network"
http://telsoc.org/ajtde/2014-03-v2-n1/a26


"Fibre to the Distribution Point (FTTdp) is a broadband access network technology that encompasses fibre to the street lead-in pit at the front fence, with an average copper lead-in length of 30m. FTTdp promises very high VDSL2 capability, with easy upgrading to G.fast or individual FTTP (Fibre to the Premises) on an on-demand basis. The network capability of FTTdp is thus very close to the capability of a full FTTP deployment. Cost savings compared to FTTP promise to be substantial – a possible $12 billion in savings for the Australian National Broadband Network – due to the use of existing copper pair lead-ins, thus avoiding civil engineering works for each individual fibre lead-in. Indeed, there is reason to expect that the initial cost of FTTdp deployment will be comparable to that of FTTN (Fibre to the Node). FTTdp has additional benefits of reduced copper maintenance and limited ongoing upgrade costs compared to FTTN. Significantly deeper fibre network penetration is potentially cost-neutral (or better) with FTTdp when compared to the FTTN baseline due to elimination of time-consuming activities involved with FTTN deployment. The reduced street impact of FTTdp is also important."

I found it particularly interesting that power is or can be supplied to the FTTdp node by the CPEs, which means the FTTdp  equipment can possibly be installed inside the footpath pits themselves without needing power infrastructure, putting them exceptionally close to the subscribers and therefore the copper lead in is quite short. I've recently been specifically looking at pits on my daily walk, and for the residential streets I've been walking, they occur quite often, probably as commonly as once every 50 metres if not more often. According to wikipedia, the G.Fast target bandwidth for lead ins less than 100m is 500Mbps to 1Gbps, so I think it is quite likely that a lot of residences in Australia would achieve that sort of bandwidth.

It is quite logical that the majority of the expense of FTTP networks is the lead in installation - the construction of residential roads and the telecommunications pits in the footpaths are going to be pretty consistent - the variation is in peoples' uniquely designed and constructed homes, driveways and gardens.


________________________________
From: Skeeve Stevens <skeeve+ausnog at theispguy.com>
To: AusNOG Mailing List <ausnog at ausnog.net> 
Sent: Tuesday, 3 February 2015, 9:27
Subject: [AusNOG] DSL G.Fast Details



Hi all,

BT (UK) have started deploying DSL G.FAST with a stated speed of up to 500mb.

They have extended their VDSL2 Vectoring trial to 100 DSLAMs (http://www.telecompaper.com/news/bt-openreach-extends-vdsl-2-vectoring-tests-to-100-dslams--1062638)

I found this: http://en.wikipedia.org/wiki/G.fast and the performance of the technology is quite interesting... especially inside buildings.

Is anyone deploying this in Australia... and indeed, is this what NBNCo is planning to extend FTTN with?  The Wiki refer to deployments using this as FTTdp (distribution point)

Does anyone know what the average distance from a NBNCo Node to the premises will be?

The Wiki doesn't give much detail what happens after 250m

I like how they say that the node is the size of a large shoebox and is often mounted on a pole.  That would be less than the size of most Bigpond Cable things on poles already in place.

Just interesting to know more.



...Skeeve

--
Skeeve Stevens - The ISP GuyEmail: skeeve at theispguy.com ; Twitter: @TheISPGuy
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