On Tue, 5 Sep 2017 07:47:04 +0100, Graham J <
gra...@invalid.com>
wrote:
>Anthony R. Gold wrote:
>> On Mon, 4 Sep 2017 23:26:03 +0100, Nick <
Nick...@yahoo.co.uk> wrote:
>>
>>> Virgin might
>>> still allow you to cancel within a month of ordering if you don't like it.
>>
>> I never knew about that older offer. I will ask about that.
>>
>>> Bottom line my VirginMedia is ok but. if I could get uncongested FTTC at
>>> > 50Mps down/ 16Mps up. I would go with that in preference.
>>
>> I am surprised to hear that. I know I can also get FTTC/VDSL from several
>> different providers over Openreach lines, but as with VM I might have no
>> prior warning of how uncongested that might be. I'll try to find neighbours
>> who can share their experiences, as several posters have advised.
>>
Try the VM web site and look at their forums?
>
>
>My understanding is that congestion in FTTC/VDSL depends on exchange
>equipment and the backhaul from the exchange. So to some extent it is
>controlled by the ISP - a better ISP will buy a bigger backhaul and
>share it with fewer clients. In some cases there may be limitations in
>the Openreach system which prevent an ISP from buying more backhaul
>capacity; but several ISPs can then band together to apply pressure to
>Openreach to install more capacity. This sort of limitation would even
>affect a leased line (or FTTP) which is otherwise uncontended.
The thing to remomber is congestion occurs at the point "somewhere
along the path" where there is an issue with passing your traffic.
Congestion is easier to detect with cable - since the rate limit for
the subscriber bandwidth is imposed by the kit, not the quality of a
copper pair.
When I had issues on my 150m cable ~ 6 months ago for a week or so it
was still running at 30m+ - which is about what i would get with
FTTC....
I noticed some connection startup lag so possibly packet loss was the
main issue rather than raw speed
>
>By contrast VM suffers congestion at the street level, depending on the
>exact technology used to distribute the signal. Any improvement would
>normally require replacement of equipment in street cabinets - much more
>of a problem for Virgin, I suspect.
They can logically split the load across different cable channels
- but yes once the fill all the channels they hit a hard limit.
- modern modulation gets more out of a channel so maybe some of the
box upgrades help use the capacity better?
Since many reports tend to be about "problems in city x" I suspect it
isnt always just individual cable segments, or there are ways to dice
the segments until they hit a more general problem.
>
>Having the choice of multiple suppliers would seem to be a more prudent
>course of action.
There dont seem to be many "cable only" locations - so most with VM as
an option probably can have FTTC as well (but not at the same speeds).
Stephen Hope
stephe...@xyzworld.com
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