CBTs

Quick question - does a CBT contain a splitter so there is one fibre in, or does the feed contain one fibre for each port?

Thanks 👍

The latter, one fibre per port.

Thank you

A follow up - what length of multi core fibre (or maximum length) is attached to the CBT? I’m wanting to work out the maximum distance from splitter to CBT.

Quote from an OpenReach engineer on kitz forum.

FTTP planning aims to get the max distance from splitter to CBT at 350mtrs. Then there is a max of 150mtrs from CBT to premises.

Technically it can be much longer but it is limited by the lengths of connectorised cable that OpenReach stock.

In reply to a post by j0hn83:

Quote from an OpenReach engineer on kitz forum.

FTTP planning aims to get the max distance from splitter to CBT at 350mtrs. Then there is a max of 150mtrs from CBT to premises.

Technically it can be much longer but it is limited by the lengths of connectorised cable that OpenReach stock.

That would not appear to be the case in reality. Many experiences of CBT to splitter being over a kilometre.

In reply to a post by Zarjaz:

In reply to a post by j0hn83:

Quote from an OpenReach engineer on kitz forum.

FTTP planning aims to get the max distance from splitter to CBT at 350mtrs. Then there is a max of 150mtrs from CBT to premises.

Technically it can be much longer but it is limited by the lengths of connectorised cable that OpenReach stock.

That would not appear to be the case in reality. Many experiences of CBT to splitter being over a kilometre.

I would have thought everything upto the cbt was spliced, thus distance isn't an issue (in terms of cabling).

I don't doubt that at all.

The guy who I quoted goes on to say he's never worked on a rural FTTP deployment.

And of course what you aim for and what you end up with aren't always the same.

Is there CBT's that length now or are they made bespoke for such jobs? Or additional splicing?

Thread on kitz quoted above.

Edit: correction

Edited by j0hn83 (Tue 21-Jul-20 09:55:04)

In reply to a post by Taras:

I would have thought everything upto the cbt was spliced, thus distance isn't an issue (in terms of cabling).

The CBT's themselves are pre spliced with preset lengths of fibre, 350m (apparently) being the longest CBT.
The other end is spliced at the splitter node.

Extra splices involved or longer tail CBT's?

Sorry i meant up to the Fibre dp.. The cbt itself would obviously be pre assembled and thus pre spliced.