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When might Eircom to enable vectoring on their eFibre/VDSL service?
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Yes 9ms to Dublin (down from 26ms pre G.INP turn on)
9ms from Galway to Dublin, like the other stats on your 1700m line, really puts mine to shame (I'm still happy with them though - so much better than this time last year
). I wonder if the fact that yours is a business line makes a difference? 0 -
9ms from Galway to Dublin, like the other stats on your 1700m line, really puts mine to shame (I'm still happy with them though - so much better than this time last year). I wonder if the fact that yours is a business line makes a difference?
I can't imagine the business line makes any difference. When the line was on DSL, it suffered constant drop outs and was totally unreliable. I had Eircom out a number of times and they even swapped the pair running back to the exchange 4Km away. I also had a new run of approx 50m of Cat5 put in, due to the errors, from the wall box back to a Eircom punch panel in the riser. From there it wanders (I'm told by Eircom) between a number of cabinets. But now I'm on VDSL it's so much better.
The figures I have seem very impressive for the quoted dB. As I said, I can't say for definite I'm at 1700m from the cab but judging by the attenuation calc checker (which some say could be incorrect) it ties in. I know that I'm over 1Km from the fact that I could not initially get VDSL and also speaking to Eircom's engineer who swapped the line back to the exchange.0 -
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It would be pretty unusual for them to run a full new line the whole way. The lines run on multi core cables filled with compressed air to keep them dry. They're filled with air by compressors in the exchange.
Not exactly insignificant infrastructure and quite a bit more complicated than you'd think.
They would just swap you to a less noisy pair.
Noise might not be from a fault either. It could be ISDN or ADSL services located next to your pair.
This is why vectoring is such a huge breakthrough. It manages all that crosstalk for VDSL2.
That's interesting - I like learning more about the infrastructure that supplies a service I've come to rely so heavily on, and the problems that can affect it.As SpaceTime says, they only swapped the pair back to the exchange through the existing cable. It actually made no odds as the line kept dropping - probably due to spiking noise outside of our building on the path back (as I had the cable re-routed in the building to try and resolve to no avail).
I'm also fairly convinced that an attenuation figure you'd see on DSL should give a good indication of what you'd get on VDSL - regardless of the different frequencies involved. But I've no other references from anyone else as there has been no direct exchange connections migrated over to VDSL. Once that happens you'd have the orig dB, orig assumed distance by DSL and be able to do a straight comparison for VDSL speed/distance as the exact same copper pair is being used. Until that time though, it's all a bit of guesswork...
Yes, I thought a fresh run, especially over 4km, was pretty unlikely. For what it's worth, my downstream attenuation on DSL was 30dB and, since moving on to VDSL, is now 24dB. I don't have a handle on how different frequencies might affect reported attenuation - I figured that the pertinent distance now was between my house and local fibre cab rather than between house and exchange, and that the reduced distance was responsible for the reduced attenuation. Something I read earlier in this thread seemed to support that supposition but I can't find it now
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If anything, moving to fibre to node / FTTC infrastructure should save them a lot of maintenance. Keeping copper cables dry in a climate like Ireland or Britain is quite challenging and requires a lot of compressed air and maintenance of leaks in cables.
Fibre can quite happily run through a puddle without any consequences as it's glass fibres with light shining through them rather than rust-prone copper.
Also it's a lot thinner than copper for the amount of data carried. So, you're talking about replacing a huge fat bundle of copper wires and complicated compression fittings with simple wiring that's not much different looking to a vacuum cleaner cable.
Roll on the roll out
I wonder if I'll still be around for the next phase of bringing fibre closer to the premises... Will we ever see fibre (or something similar) piped into homes in the same cable as the electric? A unified infrastructure might be viable assuming there is no interference to fibre optics (being, as you say, light based) from the electromagnetic fields.0 -
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The NTU filter should be taking care of most of that.
Older P&T era wiring is actually great for DSL. They tended to use grey and white very, very high quality twisted single pairs. It's sometimes tinnned copper though which may behave differently for attenuation.
That's what you'll find in a lot of 1960s-late 70s buildings.
The bad wiring is almost always DIY or electrician installed.
As long as the insulation is still intact
Problem is a lot of it is DIY. High grade TE cabling to the street, junk bargain bin old runs after that.
The NTU will help if its inside the house, but I'm talking before that. Buried under the garden.0 -
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