Depends on the route the fibre takes and where they have placed the aggregation node (s), but I may not be necessary to take the fibre your local exchange at all.

Edited by deleted (Tue 02-Jun-15 10:53:35)

In reply to a post by Ribble:

Depends on the route the fibre takes and where they have placed the aggregation node (s), but I may nit be necessary to take the fibre your local exchange at all.

hmm ok thanks!

One further possibility, beyond the ones already mentioned related to shutting rural exchanges, is using exchange -> exchange spines to add resilience.

The general understanding has been that fibre spines ran out from an exchange, taking in a number of PCPs en route. However, I saw a suggestion today that spines run exchange to exchange.

Quite a while ago, I saw a proposal from within BT suggesting that fibre could run from exchange to exchange, offering the possibility for cabinets to be dual-parented, improving resilience.
http://www.ecoc2010.org/contents/attached/c20/WS_5_R...

This concept extended backwards, as suggested by others, allowing those small exchanges to close - ultimately leaving the spines running between core nodes instead.

I wonder if BT have been putting into place exactly this kind of resilient architecture.

It could, of course, mean that they're putting in additional exchanges exchange backhaul.

Perhaps that's what they are doing.
Connecting Devon & Somerset said that the Yeovil Exchange is the headend for our area.
I just thought it was quite strange they were running the fibre from the last cabinet in Yeovil nearest to us and on to Martock as I would have assumed they would have already been linked by fibre in the first place if that topology is in use.

It's killing me not knowing how this works

oh and i spoke to TalkTalk (my provider) who said it wasn't available yet however there were some fibre lines already in use at the exchange.

The plot thickens!

Edited by deleted (Thu 04-Jun-15 06:11:15)

In reply to a post by WWWombat:

One further possibility, beyond the ones already mentioned related to shutting rural exchanges, is using exchange -> exchange spines to add resilience.

The general understanding has been that fibre spines ran out from an exchange, taking in a number of PCPs en route. However, I saw a suggestion today that spines run exchange to exchange.

Quite a while ago, I saw a proposal from within BT suggesting that fibre could run from exchange to exchange, offering the possibility for cabinets to be dual-parented, improving resilience.
http://www.ecoc2010.org/contents/attached/c20/WS_5_R...

This concept extended backwards, as suggested by others, allowing those small exchanges to close - ultimately leaving the spines running between core nodes instead.

I wonder if BT have been putting into place exactly this kind of resilient architecture.

It could, of course, mean that they're putting in additional exchanges exchange backhaul.

Thanks for linking this it made interesting reading, has this been done anywhere that anyone knows of? I live in a village next to the OP (bewA) but on the same exchange, we have both watched as this fibre cable runs from yeovil, through their village, now through mine Stoke Sub Hamdon and then onto the village with the exchange (Martock), along the way has run next to all the new fibre cabinets and yet it appears albeit it early days nothing has been activated.

*

, has this been done anywhere that anyone knows of?

No. Generally the fibre spine goes from the head end exchange out to the local exchange area, maybe via an existing route or via a new route if none exists, to the aggression node (s). Outlying cabs maybe fed from a node in the adjacent exchange area to avoid having to double back The spine rarely if ever goes through the local exchange unless it is also the headend, but may go to a node ( manhole) outside to feed the local cabinets

In reply to a post by Ribble:

Outlying cabs maybe fed from a node in the adjacent exchange area to avoid having to double back The spine rarely if ever goes through the local exchange unless it is also the headend, but may go to a node ( manhole) outside to feed the local cabinets

On this last point, the text on page 14 shows the same idea - "When Intermediate exchanges are no longer required can be bypassed", with the diagram showing: In one local exchange, the thicker spine line is implied to go into the exchange, but in two cases it goes into a "junction access point" in front of the exchange.

Spines might not exist entirely in this resilient mode, but the ability to drop intermediate exchanges, and connect only to "enduring" exchanges seems to be thoroughly employed.

Well everything has gone quiet now. Looks like the initial load of NGA's are in with some planning for a couple of others late August/September.
BT/contractors had to put in new ducting between the next village and the exchange home village (Martock). Not sure if they put the fibre in yet where they had to replace the ducting. It was about 0.5km of new ducting anyways.
the PCP serving my village has been reshelled as of a couple of weeks a go.
I suppose now the waiting game between now and commissioning the NGA.
Nothing new about speeds for FTTC on BT's Wholesale checker.

The only date i've got is from CDS' website saying Jan 2016 for PCP5 on WWMART but after emailing CDS direct they are suggesting October at the moment!