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Genesis gives birth to DSLRings up to 400 Mbps technology
Monday 15 October 2012 11:07:46 by Andrew Ferguson

Genesis Technical Systems has found a novel way to potentially provide up to 400 Mbps to properties over the existing copper network, without the expense of deploying fibre.

The DSL Rings technology was demonstrated at NextGen12 and this week has moved on to the Broadband World Forum in Amsterdam.

With Openreach committed to its majority FTTC programme (~10% FTTP) and no sign of the local authorities going for anything massively alternative, DSL Rings looks unlikely to be deployed on a large scale in the UK, but it may find its way into the mix for some areas possibly. The market is most likely to be overseas in countries that have not already started deploying fibre.

400 Mbps over copper sounds very promising, but if you watch the YouTube presentation it becomes clear as to how this is achieved. Most VDSL2 deployments currently operate from the street cabinet, but Genesis is proposing moving the point at which VDSL2 operates to be the drop point (closest telegraph pole that serves 10 to 16 properties). At this short distance of 50m VDSL2 can perform in the 150 to 250 Mbps speed range, then by bonding a second pair you reach 400 Mbps, the clever part of the Genesis system appears to be to create a shared loop between the properties and thus aggregating the bandwidth, so the node on the pole can use a single bonded connection back to the exchange.

We are not sure about the concept and its useful deployment in the UK, some older properties with original drop wires only have a single pair, and the distance from the drop point to the exchange even if bonding is used will be a long way to get decent speeds without deploying fibre. The issue of power for a small device should not be a factor as other manufacturers have demonstrated small DSLAMs that can be powered by a couple of copper pairs.


Posted by AndrueC over 4 years ago
There's also a lot of relatively new builds (like mine built in the late 80s) that have no drop wires.
Posted by locris over 4 years ago
Drop wire means connecting wire - not necessarily overhead - your drop wire will be underground.
Posted by snadge over 4 years ago
good... but 'shared' bandwidth...suppose it depends on what your neighbours are like with their internet connection..I live next to a load of elderly people so I guess it would be high-speed for me most of the time.
Posted by izools over 4 years ago
OK so you have 20 properties served by a DP.

Each property can connect at let's say for argument's sake 4 meg due to line length.

These lines are combined into a 20x4mbit aggregate bonded set, yielding a total of 80Mbit bandwidth

(Note the bandwidth per pair remains the same due to the loop length)

This 80Mbit bandwidth is then shared back about these 20 properties.

So each still has a four megabit bandwidth, uncontended.

Seems kinda stupid to me or have I missed something?
Posted by andrew (Favicon staff member) over 4 years ago
Would be extremely rare to have a DP so far away that only 4Meg were possible. The DP is a lot closer than the street cabinet, usually 50 to 100m
Posted by Dixinormous over 4 years ago
This is all getting a bit silly though, it's just fibre to a bit closer than the cabinet. There's a definite and legitimate case for FTTN/C and the same goes for FTTB, both are natural aggregation points, both are likely to be close-ish to power.

There's a pretty high degree of desperation to sweat the copper evidenced here when you're pushing out active hardware onto a wall / pole to share between 20 people.
Posted by locris over 4 years ago
"At the moment we can't see any reason why any individual family can use more than 24 Megs, we tried it in our labs and we recreate every typical house across the UK with HD streaming, with facebook uploads, you tube downloads whatever it is, we can't create a situation where more than 24 Mega bits is used. It doesn't mean we should build the infrastructure for what we see today, we absolutely shouldn't, we should build it for the future."

Transcript from Speech at NextGen 12
Posted by andrew (Favicon staff member) over 4 years ago
@dixinormous They are not advocating fibre to the DP, but using bonding for the backhaul from there to the node or exchange
Posted by vicdupreez over 4 years ago
Ok... so here is another perfect example... Mark my words... and I will eat them if I am wrong... BT will NOT touch this until they have finished with their patchy fttc and fttp installs. Then they will say that this is outdated technology and that there is no possible benefit... PLEASE BT prove me wrong...
Posted by WWWombat over 4 years ago
But surely the bonded pairs that go back from the DP to the exchange (or even the cabinet) aren't going to be as short as the house-DP links.

I think it is a bit optimistic to expect that this side is *also* capable of 400Mbps.
Posted by New_Londoner over 4 years ago
I would expect Vectoring to be easier to implement, and without the need to bond pairs etc. Also, not sure it's worth introducing contention into this part of the network given the problems it's causing Virgin already. An upgrade path to Vectoring and profile 30a, with the option of FTTP on dmand looks like a better bet to me than this.
Posted by Dixinormous over 4 years ago
I should've put the word fibre in quotes there Andrew. Regardless the point on active hardware getting closer to the customer stands.

This is getting silly and at very most would perhaps be viable as a tactical solution used very sparingly indeed where appropriate and worthwhile.
Posted by andrew (Favicon staff member) over 4 years ago

I actually agree with you, in terms of if the costs to deploy mean its a choice of a 2 Meg BET service or this for cluster of 3 or 4 properties then this might be option.
Posted by locris over 4 years ago
@Andrew Costs to deploy DSL Rings are a very small fraction of fibre & not much more than conventional DSL technologies & those costs will come down.

DSL Rings is back haul agnostic, however, its Bonded solution will bond blocks of 12 pairs up to 48 (currently). Regeneration technology takes care of the distance problem to provide an end to end solution. So if each pair renders 10Mb/s 24 could provide 240Mb/s. A great advantage is that, if there is a dodgy pair (say giving just 2Mb/s) because it's bonded, no individual suffers - the bandwidth is shared equally so it would be 232Mb/s.
Posted by searcher100 over 4 years ago
This is assuming the metal thieves won't rip all the copper wire and metal box's they can find. Fibre has no value to them. But new shiny metal attached to telegraph poles may be tempting. I've had the lead balance weights taken of my car wheels so size and weight of new equipment might be to much for them.
Posted by locris over 4 years ago
Tasty neighbours.... ;)

There is no new metal - as the man said, it reuses the existing copper network:

Cheers .....
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