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So what happens to regular ADSL when a local cabinet is upgraded to fibre?

mgillespie
Grafter
Posts: 222
Registered: 08-04-2007

So what happens to regular ADSL when a local cabinet is upgraded to fibre?

My mothers internet has always been pretty naff, she is a fair distance from the exchange.   She pays for an upto 8MBit connection, but at the best of times, it's more like 2MBit, with a massive amount of variation on that according to speed checkers and ping tests.
Recently the local cabinet was upgraded to fibre and it's open for orders, and now her internet is rock solid 2MBit, with speed checker almost a flatline at 2Mbit, as if it's being artificially capped at that previously copper theoretical speed but now running over fibre but at copper speeds for her line distance.
Is this true?  If so, that's a bit unfair, as surely it should be capped at what she pays for (upto 8Mbit).  If so, is this even legal?
13 REPLIES
Community Veteran
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Registered: 02-02-2008

Re: So what happens to regular ADSL when a local cabinet is upgraded to fibre?

In theory nothing happens.
In practice they've probably remade a fair few joints during the install and she's getting the benefit of the resulting stability.
mgillespie
Grafter
Posts: 222
Registered: 08-04-2007

Re: So what happens to regular ADSL when a local cabinet is upgraded to fibre?

So it's still running copper all the way back to the exchange?
Community Veteran
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Registered: 15-06-2007

Re: So what happens to regular ADSL when a local cabinet is upgraded to fibre?

The only effect on your mothers line is if a load of users on the existing cab have switched to fibre.thereby reducing the load from the cab to the exchange
The fibre cab gets a fibre feed direct from the exchange bypassing the local cab completely
If you want to ask for help in relation to your mothers line please provide the information requested here http://community.plus.net/forum/index.php/topic,96155.0.html
mgillespie
Grafter
Posts: 222
Registered: 08-04-2007

Re: So what happens to regular ADSL when a local cabinet is upgraded to fibre?

It's actually now working properly for her distance from the exchange.  It's been problematic for years, and fixed itself magically the same few weeks it all switched over in her area.

Community Veteran
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Re: So what happens to regular ADSL when a local cabinet is upgraded to fibre?

Interesting.... since Fibre was available in this area my speed has almost doubled, guess it's down to more people transferring to Fibre.
pwatson
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Re: So what happens to regular ADSL when a local cabinet is upgraded to fibre?

Quote from: Oldjim
The only effect on your mothers line is if a load of users on the existing cab have switched to fibre.thereby reducing the load from the cab to the exchange

Define 'load'? 
There's nothing active in the cabinet for ADSL and each customer's data is separate all the way back to the exchange.  It is possible that fewer ADSL users on the shared path from the cabinet to the exchange would mean less crosstalk and therefore an improvement in the signal to noise performance of remaining ADSL connections?
Community Veteran
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Re: So what happens to regular ADSL when a local cabinet is upgraded to fibre?

Does the exchange have to be 21CN for FTTC to be available?
Edit: looks like the answer is no.
Community Veteran
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Re: So what happens to regular ADSL when a local cabinet is upgraded to fibre?

Quote from: pwatson
Quote from: Oldjim
The only effect on your mothers line is if a load of users on the existing cab have switched to fibre.thereby reducing the load from the cab to the exchange

Define 'load'? 
There's nothing active in the cabinet for ADSL and each customer's data is separate all the way back to the exchange.  It is possible that fewer ADSL users on the shared path from the cabinet to the exchange would mean less crosstalk and therefore an improvement in the signal to noise performance of remaining ADSL connections?

load in this context means - a lot of
The implication of the first post was that speed tests were very variable which is a sign that the exchange virtual path to which the cab was connected may be running hot and therefore shifting a lot of heavy users onto fibre - which is different virtual path - could alleviate the situation
itsme
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Re: So what happens to regular ADSL when a local cabinet is upgraded to fibre?

Quote from: gleneagles
Interesting.... since Fibre was available in this area my speed has almost doubled, guess it's down to more people transferring to Fibre.

Same here but it double after upgrading the cabinets, they renewed the existing cabinet, but before they started moving users over to fibre.
pwatson
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Re: So what happens to regular ADSL when a local cabinet is upgraded to fibre?

Quote from: Oldjim
Quote from: pwatson
Quote from: Oldjim
thereby reducing the load from the cab to the exchange

Define 'load'
load in this context means - a lot of
The implication of the first post was that speed tests were very variable which is a sign that the exchange virtual path to which the cab was connected may be running hot

My point was that the 'load from the cab to the exchange' is erroneous.  Any resultant reduction of the traffic on the virtual path from the exchange onwards may indeed have a positive effect on speedtests of course...
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Re: So what happens to regular ADSL when a local cabinet is upgraded to fibre?

@ClashcityRocker
I suspect it will be a combination of things. Your mother had a poor connection before, due to some problem that may have got resolved as a result of the work that has gone on with the Fibre enablement. The existing PCP Cab will have had work done on it, a certain amount of re-jumpering will have taken place and bad joints may have been remade. There will be less ADSL users on the copper cable back to the exchange and therefore less cross-talk resulting in an improved noise margin which will have given better speed on a resync.
Is your mother with Plusnet for Broadband?
mgillespie
Grafter
Posts: 222
Registered: 08-04-2007

Re: So what happens to regular ADSL when a local cabinet is upgraded to fibre?

Quote from: Anotherone
Is your mother with Plusnet for Broadband?

You don't think I would miss out on a referral do you?  Cheesy Cheesy
Community Veteran
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Registered: 31-08-2007

Re: So what happens to regular ADSL when a local cabinet is upgraded to fibre?

Well next time you are round there, post the full modem/router DSL stats and then whoever can say how well the connection is or is not doing  Smiley