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Standard User WWWombat
(fountain of knowledge) Wed 06-Feb-13 14:49:18
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Re: Finallly getting TalkTalk Fibre

[re: kasg] [link to this post]
I reckon that we should all get used to the fact that interleaving is going to end up on every line when take-up gets high enough, and that these initial years (or months) are the golden ones.

My own rule of thumb is that the original FTTC on profile 8c gave us one third of the speed, the switch to profile 17a gives us the second third, and the final third comes (or gets restored) from vectoring.

Roll on vectoring then...
Standard User David_W
(experienced) Wed 06-Feb-13 15:12:40
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Re: Finallly getting TalkTalk Fibre

[re: WWWombat] [link to this post]
Some level of interleaving and FEC will probably become more common, though I doubt it will be seen on every line.

In my area, Virgin Media got here first with broadband and the majority of people still seem to be on Virgin, as can be seen from the SSIDs of many of the wireless networks.

This entire side of town (to within around 100m of the exchange) was built in the late seventies and early eighties with decent underground copper D side cabling. I'd think it likely that the E side cabling was an entirely new deployment at that time (which explains why it was always pretty good for ADSL and ADSL2+, though, of course, the E side plays no part in FTTC other than carrying the voice signal from the exchange). As a result, there's none of the junky old line plant many people have to suffer - no old paper insulated cable, no pairs with low twist ratio, no untwisted wiring and no aluminium (so far as I know). All the BT Openreach line plant is underground in ducts - the only overhead stuff is outside the town itself.

There's a relatively high number of PCPs, though the housing is moderately dense - I expect it gives a good balance of relatively short D side cables and a decent number of properties per PCP to make the FTTC roll-out economically viable.

I'd expect this area to be something of a best case scenario for FTTC, though as FTTC is still relatively new and BT Retail are aggressively marketing Infinity, it remains to be seen how high take-up will eventually be. According to the engineer, I was the second FTTC connection on the PCP, and I still have the same latency I had at install, which implies I'm still on fast path. My router keeps RRD graphs of first hop latency and I have thinkbroadband BQM running, so I can keep an eye on those even though I haven't hacked my modem.

As you rightly say, deployment of vectoring offers hope of minimising near-end crosstalk at the DSLAM, which is the majority of crosstalk experienced in a VDSL2 deployment. Hopefully BT Openreach are continuing to work towards deploying vectoring across their FTTC footprint.

The next generation after VDSL2 is likely to require PON - VDSL2 gets pretty much to the limits of copper twisted pairs. Being optical, PON has no issues with crosstalk and REIN. It remains to be seen how the FTTP and FTTB footprint grows in the next few years.

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