120M : Can someone explain why cable suffers on upload?

[telfordcable]

Originally Posted by qasdfdsaq

Careful, he knows mspaint.

lol

[Kushan]

Originally Posted by telfordcable

lol

Hey Telford, check this out:

[telfordcable]

^^ wish we all having this! Maybe one day!

[craigj2k12]

Just upgraded my VM package...

[roughbeast]

Returning to the main topic:

This may seem dumb, but would it not make sense for VM to upgrade the coax between the optical node and street cab to fibre? This seems to be the sticking point when it comes to competing with BTs upstream capability and overall capacity.
Yep, very very expensive and it's not just the cable that would have to be changed, but as a long-term plan would it not be worth aiming for?

<Prepares for ridicule>

Remember this Seph? http://en.wikipedia.org/wiki/Hybrid_fibre-coaxial

I like it, even if it has so many wrong bits, and it keeps my world nice and simple.

[Kushan]

I thought most of the green cabs already did have fibre going into them, with some that are just coax.

There seems to be a different answer to this one every time it comes up, though.

[qasdfdsaq]

Originally Posted by roughbeast

Returning to the main topic:

This may seem dumb, but would it not make sense for VM to upgrade the coax between the optical node and street cab to fibre? This seems to be the sticking point when it comes to competing with BTs upstream capability and overall capacity.

That's kinda what we were talking about several pages ago.

Though to be honest it'd be just as effective to run ten extra coax lines as it would be to run ten extra fibre lines, both carry DOCSIS RF channels anyway. Although fibre would be thinner so you could probably fit more into the same space if you were limited by duct diameter.

---------- Post added at 01:58 ---------- Previous post was at 01:56 ----------

[telfordcable]

Virgin Media to bring new traffic management on xmas day:

133Mb to become 1.5Tb download and 12Mb to become 1.5Tb upload all day xmas day only

[roughbeast]

Originally Posted by qasdfdsaq

That's kinda what we were talking about several pages ago.

Though to be honest it'd be just as effective to run ten extra coax lines as it would be to run ten extra fibre lines, both carry DOCSIS RF channels anyway. Although fibre would be thinner so you could probably fit more into the same space if you were limited by duct diameter.[COLOR="Silver"]

Yes, but I didn't get a definitive answer. What would be most expensive and which would offer most future proofing? Extra coax or fibre?

Originally Posted by Kushan

I thought most of the green cabs already did have fibre going into them, with some that are just coax.

There seems to be a different answer to this one every time it comes up, though.

I wonder how many areas already have fibre from node to cab then and how many of those have individualised coax from cab to premises?

[Sephiroth]

Originally Posted by roughbeast

Returning to the main topic:

This may seem dumb, but would it not make sense for VM to upgrade the coax between the optical node and street cab to fibre? This seems to be the sticking point when it comes to competing with BTs upstream capability and overall capacity.
Yep, very very expensive and it's not just the cable that would have to be changed, but as a long-term plan would it not be worth aiming for?

<Prepares for ridicule>

Remember this Seph? http://en.wikipedia.org/wiki/Hybrid_fibre-coaxial

I like it, even if it has so many wrong bits, and it keeps my world nice and simple.

Qasi has partially answered this as regards the same RF frequencies. The key to higher speed is the number of available channels load balanced to the users. This doesn't rise with a switch from coax to cable. Indeed, unless fibre technology has moved on since I last looked some time ago, a single fibre is constrained to 96 colours (frequencies) whereas coax is not.

The channel number constraint on coax is the (for illustration I'll take the downstream) frequency range divided by the 8 MHz bandwidth (what is it now 200 meg to 1 Gig which gives 100 theoretical channels?).

To answer Kushan's point about fibre at the green cabinet - in my area 5 or so launch cabinets aggregate over coax at an optical node and maybe 20 or so green cabinets go to a launch cabinet.

Something like that,

[qasdfdsaq]

Originally Posted by roughbeast

Yes, but I didn't get a definitive answer. What would be most expensive and which would offer most future proofing? Extra coax or fibre?

Fibre would be more expensive
Fibre would offer more future proofing

Fibre offers virtually unlimited capacity but using it all gets exceedingly expensive - to the point it's much much cheaper to run multiple fibres than to shove more carriers onto one fibre once you go above a certain amount. It also requires more expensive active equipment.

The main advantage of coax is it's easy to manipulate - extending, shortening, splitting, etc. can all be done with a couple of $15 hand tools. Splicing fibre is something you need a dedicated technician to do with a few hundred $'s worth of equipment.

I wonder how many areas already have fibre from node to cab then and how many of those have individualised coax from cab to premises?

None?

[adzii_nufc]

Sorry if it's already been answered but what speeds could/should we be looking at with Virgin in the next two years. Realistically not theoretically. Both upload and download.

200/20? As the next top tier?

[telfordcable]

Originally Posted by adzii_nufc

200/20? As the next top tier?

No, should be 200/100 next year

60/30
120/60
200/100

[Kushan]

Originally Posted by telfordcable

No, should be 200/100 next year

60/30
120/60
200/100

[Sephiroth]

You'd need 4 upstreams per modem with at least 64QAM. Is that what VM are doing?