120M : (Advice) Thinking of leaving Virgin Media 120mb for BT Infinity up to 76mb

[qasdfdsaq]

Originally Posted by Kushan

Is that true for all VM cabs? I know that some aren't even fed by fibre but more coax, but is it really only one fibre at most? Surely some of the busier areas have additional capacity?

None of the street (distribution) cabs are fed by any fibre at all.

Only the optical nodes are fed by fibre and each fibre is then split into multiple coax.

[AbyssUnderground]

Originally Posted by qasdfdsaq

I've not done a spectral analysis of VM's copper to see how much of the spectrum they actually use - but even the copper coax can carry up to 5-6Gbps under good conditions.

You assume of course the underlying tech (DOCSIS3) can also cope with the speed, which if I'm right in thinking, it can't. I think it tops out at 1Gbps but that tech isn't adopted widely by VM yet (only in trial areas?).

FTTC is flat out fiber to the cab, then it splits into the VDSL signals to your phone line, so the bandwidth is only split at the cabinet, not at the fiber node like on VM which then runs on coax to the street cabs, which then splits again to the individual premises.

[qasdfdsaq]

The total capacity of a piece of coax or fibre has nothing to do with the maximum speed DOCSIS 3 can deliver to a single broadband subscriber.

[telfordcable]

This service by BT FTTPoD is the highest speed up to 330/30 but look at the price below:

http://www.openreach.co.uk/orpg/home...2e9%2Bmw%3D%3D

Best move to nearer NGA Aggregation Node within 0m-199m

[qasdfdsaq]

Or just live at my old office raping the dual 10Gbps links for all they're worth.

[AbyssUnderground]

Originally Posted by qasdfdsaq

The total capacity of a piece of coax or fibre has nothing to do with the maximum speed DOCSIS 3 can deliver to a single broadband subscriber.

My point was the DOCSIS technology VM runs on isn't capable of the 5-6Gbps you state the cable can handle, so the cable would never push that speed over that tech in comparison to fiber and VDSL.

[kwikbreaks]

Originally Posted by qasdfdsaq

The Openreach FTTC DLM is a completely new beast and quite different to the traditional ADSL DLM. It wouldn't have been in use 5 years ago.

From odds and ends I've seen I think the 21C WBC ADSL is different from the version I knew and hated too.

Incidentally I do know that PlusNet sometimes fail to update their internal profile in line with the BTw profile. Their forum frequently has requests to fix those problems and to their credit the forum techs do get it done but the frequency of those requests suggests the automation is a PoS especially considering the vast majority of customers wouldn't be sufficiently switched on to realise there was an issue.

[telfordcable]

PlusNet sometimes fail to update their internal profile in line with the BTw profile is really annoying and pain in the arse. Why is all isp's got two profiling on both sides Bt and the Isp to match the profile correct. Rather daft.

[kwikbreaks]

Originally Posted by AbyssUnderground

My point was the DOCSIS technology VM runs on isn't capable of the 5-6Gbps you state the cable can handle,

20 50Mbps channels can carry 1Gbps so it would need 120 to handle 6Gbps ignoring upstream. Moderate length coax runs could just about cope with that but it would certainly exclude all TV.

---------- Post added at 14:22 ---------- Previous post was at 14:20 ----------

Originally Posted by telfordcable

PlusNet sometimes fail to update their internal profile in line with the BTw profile is really annoying and pain in the arse. Why is all isp's got two profiling on both sides Bt and the Isp to match the profile correct. Rather daft.

I'm guessing they may do it to avoid packet loss.

[qasdfdsaq]

Originally Posted by AbyssUnderground

My point was the DOCSIS technology VM runs on isn't capable of the 5-6Gbps you state the cable can handle, so the cable would never push that speed over that tech in comparison to fiber and VDSL.

You forget much of the cable's capacity is used by several hundred megabits, if not gigabits, of broadcast television. Which has nothing to do with DOCSIS.

Are you somehow of the opinion cable TV does not exist?

[AbyssUnderground]

No of course I know that exists, but I was talking about the Internet delivery side of it.

That said, I don't tend to watch TV so whether it exists or not doesn't bother me

[qasdfdsaq]

The capacity of the cable has very little to do with "the internet delivery side of it"

[telfordcable]

Is that true that virgin media say to me that it will increase 152Meg this year but the upload remain at 12Meg. Virgin ain't interesting in upload increasing (only the download is priority to them) Yesterday, I downloading 117GB and the speed haven't reduced at all, it stay at 12.3MB/s max out transfer rate.

[craigj2k12]

Originally Posted by AbyssUnderground

The other great thing with FTTC is there should be no local congestion issues with it all being fiber, unlike the limited bandwidth of copper that I believe virgin uses (not all cabs are linked with fiber).

http://www.extremetech.com/computing...ccessor-to-dsl

---------- Post added at 16:31 ---------- Previous post was at 16:31 ----------

Originally Posted by Kushan

Fibre has limited bandwidth as well, you know. It's just....better than copper. A lot better.

http://www.techweekeurope.co.uk/news...channel-117030

[qasdfdsaq]

Originally Posted by craigj2k12

http://www.extremetech.com/computing...ccessor-to-dsl

http://www.ispreview.co.uk/index.php...broadband.html

---------- Post added at 17:01 ---------- Previous post was at 17:00 ----------

Originally Posted by craigj2k12

http://www.techweekeurope.co.uk/news...channel-117030

http://www.ispreview.co.uk/index.php...tic-cable.html