General Questions - Rural FTTP

We are having FTTP connected at the end of this year, I have two general questions that I will be grateful if anyone can answer for me -

1. Outside the village the properties are on average 1/2 mile apart with a pole outside each house. Will there normally be an individual CBT for each property and the fibre cable therefore spliced every 1/2 mile?

2. Is the Allt/ISP's ONU normally at each Village Exchange or in a new cabinet at the Fibre Network Access Point if this is different. Is there a map of where these access points are?.

Much appreciated.

If the properties really are 1/2 mile apart, then yes, quite likely a fibre CBT on each pole …. Where the splices are on the fibres route back to the splitter node would be far less predictable.

If you are referring to Openreach FTTP, then fibres usually run to a splitter, then aggregation node, then at a head end in one of the larger exchanges

Would they typically put in a 4 port CBT but only light 1 port?

In reply to a post by dect:

Would they typically put in a 4 port CBT but only light 1 port?

They normally have put the 4 port ones around here for one property, along with having these tiny splitter nodes lower down (they are about a third the size of the normal splitters). Would have assumed they would light up all ports on the CBT, even though its unlikely more than 2 would ever be used.

Edited by deleted (Thu 10-Jun-21 07:21:02)

In reply to a post by dogcat:

They normally have put the 4 port ones around here for one property

Thanks for confirming

In reply to a post by dogcat:

tiny splitter nodes lower down (they are about a third the size of the normal splitters).

They sound like track nodes rather than splitter nodes.

In reply to a post by dogcat:

Would have assumed they would light up all ports on the CBT, even though its unlikely more than 2 would ever be used.

That would be a waste if they did as a 32 way fibre split could be reduced down to possibly only 8 active customers on one fibre.

In reply to a post by dect:

Would they typically put in a 4 port CBT but only light 1 port?

Quite possibly … but that leaves the flexibility of unlit spares, rather like the copper network.

They sound like track nodes rather than splitter nodes.

My thoughts too

In reply to a post by Zarjaz:

Quite possibly … but that leaves the flexibility of unlit spares, rather like the copper network.

Thanks

In reply to a post by Zarjaz:

In reply to a post by dect:

Would they typically put in a 4 port CBT but only light 1 port?

Quite possibly … but that leaves the flexibility of unlit spares, rather like the copper network.

At what point (urban vs semi-rural vs deep in the sticks) do they decide on commissioning the CBT whether to splice and light all the ports at the splitter node? I kind of understand the deep rural situation, but in the urban situation it would surely make no sense to splice and light the ports individually.

Also how many PONs do they typically run to a splitter node? There must be at least a choice of primary and secondary PON? (appreciate this could be commercially confidential, so I'm expecting a "no comment" 😂)

It seems, from my limited experience, that most CBT’s are not fully lit … 6 on a 12, 4 on an 8 etc etc …

I suppose some faceless planner somewhere looks at how many properties a copper DP serves and bases it roughly on that.

No comment

In my case in our village, I live on a private lane and I am the only one with a UG feed (underground) and in our manhole I have my own 4 way CBT, and was told they only light up 2 ports, I ask why, one working and one spare if the other goes down.
Our fibre goes through many nodes (joints) on the way to an exchange 12 miles away and not our local one 3 miles away.
It has nothing to do with any cabinets.

Our Local farms and near by properties may have there own 4 way CBT or one larger one (that's worked out in the area survey.)
They have various lengths of pre-connectorised fbre cable up to 350 metre's that go to the properties from the CBT.

There are No maps for the public to access.

See Link

In reply to a post by Pheasant:

Also how many PONs do they typically run to a splitter node? There must be at least a choice of primary and secondary PON? (appreciate this could be commercially confidential, so I'm expecting a "no comment" 😂)

In Urban areas they usually put 2 or 4 separate splitters in to a single enclosure.
So up to 4 PONs per Splitter Node.

Confusingly, OpenReach actually label this as a single PON, so up to 120 properties per "OpenReach PON".
Technically it's 4 individual GPON PONs, fed by 4 fibres.

Although it's a 32:1 split they try keep 2 spare per Splitter.

In my new build that was retro fitted with FTTP last year they did 2 splitters per enclosure, so up to 60 properties per enclosure for the whole development.

Thank you

Thanks John. Very insightful as usual.