Kitz Forum

Broadband Related => FTTC and FTTP Issues => Topic started by: renluop on July 29, 2015, 04:27:47 PM

Title: EO lines and FTTC- a perhaps odd question
Post by: renluop on July 29, 2015, 04:27:47 PM: It was a friend's move in to a premises on an EO line that raised this one in my noddle.

The normal PCP is some way from the exchange so supplying fibre gives a welcome substantial sipped uplift. In the case of fibre cabinets for EO lines that will be extremely close to the exchange, the copper line thence to the user premises will be pretty well the same.

I've a feeling I may be missing something, but where does the benefit for EO premises lie, as they so little fibre in their route?

In advance suitable smileys are ::) :-[ :blush: :-X
Title: Re: EO lines and FTTC- a perhaps odd question
Post by: licquorice on July 29, 2015, 05:11:37 PM: VDSL cannot be supplied directly from the exchange, so only the slower ADSL is available on EO lines without a cabinet.
Title: Re: EO lines and FTTC- a perhaps odd question
Post by: renluop on July 29, 2015, 05:16:18 PM: I know that, but the beginnings of installations of (combined)cabinets close to exchanges is on the cards.
Is it not?
Title: Re: EO lines and FTTC- a perhaps odd question
Post by: lcl00 on July 29, 2015, 05:19:34 PM: BT aren't able to provide VDSL from the exchange. The reason given for this is that it would interfere with the existing ADSL lines. I don't really understand this given that they can use power masking to reduce the impact that VDSL at a remote cabinet will have on ADSL lines.

I think the current course of action to address this is to reroute groups of customers through an existing cabinet or potentially add a new cabinet somewhere between the exchange and the customer. If it's a new cabinet, it's likely that it'll be one of the combined cabinets. There seem to be many of them cropping up around here lately although they are to provide fibre for customers further away from an existing cabinet usually.
Title: Re: EO lines and FTTC- a perhaps odd question
Post by: licquorice on July 29, 2015, 05:24:52 PM: Quote from: renluop on July 29, 2015, 05:16:18 PM
I know that, but the beginnings of installations of (combined)cabinets close to exchanges is on the cards.
Is it not?

Yes, so they will be able to get the faster VDSL speeds. The length of fibre is immaterial.
Title: Re: EO lines and FTTC- a perhaps odd question
Post by: Black Sheep on July 29, 2015, 07:16:18 PM: As touched upon above ......... the preferred method is to 'drop a cab' generally just outside the Exchange, to 'pick up' the EO feed cable. Then, at the side of that new cab, the VDSL cab is installed and FTTC is the available.

There are a tiny percentage of 'combined cabs' whereby the EO cable and the VDSL equipment (DSLAM) are sited in the same cab. I've never seen one, but they do exist.
Title: Re: EO lines and FTTC- a perhaps odd question
Post by: Ronski on July 29, 2015, 07:29:07 PM: Quote from: renluop on July 29, 2015, 04:27:47 PM
I've a feeling I may be missing something, but where does the benefit for EO premises lie, as they so little fibre in their route?

In advance suitable smileys are ::) :-[ :blush: :-X

If you live right next to the exchange then the most you'll get on adsl is 24/1.2 Mbps, with FTTC you could then get 80/20. The length of fibre makes no difference.
Title: Re: EO lines and FTTC- a perhaps odd question
Post by: renluop on July 29, 2015, 08:40:57 PM: I must be having a worse day than normal with befuddling brain? :(

BTW has anyone calculated the attenuation rate from the fibre cabs yet?
Title: Re: EO lines and FTTC- a perhaps odd question
Post by: Black Sheep on July 29, 2015, 08:50:26 PM: Quote from: renluop on July 29, 2015, 08:40:57 PM
I must be having a worse day than normal with befuddling brain? :(

BTW has anyone calculated the attenuation rate from the fibre cabs yet?

How do you mean, Ren ?? Are you talking about speed-drop over D-side distance ??
Title: Re: EO lines and FTTC- a perhaps odd question
Post by: renluop on July 30, 2015, 06:08:47 AM: Mais oui, M.
Title: Re: EO lines and FTTC- a perhaps odd question
Post by: Black Sheep on July 30, 2015, 07:22:27 AM: Quote from: renluop on July 30, 2015, 06:08:47 AM
Mais oui, M.

Ha ha, I first had to 'Google' you reply ......... but to answer your question ..... yeah, this is old had really Ren.

Somewhere in the dim and distant past on this forum, there is a coloured graph/chart that is similar to the original ADSL graph/chart ..... that depicts the average 'speed over attenuation'.
If only I had the time to dig it out. :)
Title: Re: EO lines and FTTC- a perhaps odd question
Post by: licquorice on July 30, 2015, 08:41:18 AM: Speed graph
Title: Re: EO lines and FTTC- a perhaps odd question
Post by: renluop on July 30, 2015, 09:46:16 AM: That graph shows the effect of attnuation, rather than the attenuation in dB. How might tat be calculated from the graph? :-\
Title: Re: EO lines and FTTC- a perhaps odd question
Post by: licquorice on July 30, 2015, 10:00:15 AM: Have a read of this thread http://forum.kitz.co.uk/index.php?topic=10566.0
Title: Re: EO lines and FTTC- a perhaps odd question
Post by: renluop on July 30, 2015, 10:18:27 AM: Thanks! I was also wondering if the fact that one's ADSL connection was very good might be an indication of what to expect from VDSL, on the basis that the D side is likely to a contributor to that ADSL performance. If there is a defect on the E side would the position along the cable length influence its affect?

( I think I'm getting konradofied without the brain) :( ;D
Title: Re: EO lines and FTTC- a perhaps odd question
Post by: licquorice on July 30, 2015, 11:26:44 AM: Not necessarily, VDSL and ADSL frequencies are different so the attenuation characteristics of the line will be different. What is good for ADSL might not be good for VDSL. The position of the defect on the E side shouldn't make any difference.
Title: Re: EO lines and FTTC- a perhaps odd question
Post by: renluop on July 30, 2015, 08:27:05 PM: Thanks! The odd reasoning behind my question was that in the matter of TV a near block of the signal, can as "I understand it (? oxymoron ;)) be worse than one more distant. An example of the illogicality of my logic. :blush: