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What is this ????

MikeW106

Member
I live off the main roads locally down a small lane with only copper lines into the house. Last week BT installed fibre cables down the lane across the top of existing poles, they left the cables wound up hanging from the pole. Today I noticed this box had been installed on the pole and the cables wired into it. What exactly is this box ? Does it indicate that there will be a wireless element to providing us with fibre broadband…… I wonder as the inscription on the box ends “4G”. Thanks
 

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It's a fibre splitting point. Nothing to do with wireless. GPON is actually a single fibre/connection for multiple premesis which are passively split into more fibres sending and recieving the same light.
 
CBT do not Urban Dictionary that.
A connectorised block terminal, also referred to as a “connectorised terminal block”, is an external box used to join and secure multiple fibre cables together.
 
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It's a fibre splitting point. Nothing to do with wireless. GPON is actually a single fibre/connection for multiple premesis which are passively split into more fibres sending and recieving the same light.
Thanks. Does that arrangement tend to result in slower speeds per premises ?
 
Thanks. Does that arrangement tend to result in slower speeds per premises ?
Depends what you define as slow, each fibre cable could have the 1.8Gbps service, and there's usually 8 ports per CBT, so the overall speed a CBT can passthrough is around 15Gbps at present
 
Depends what you define as slow, each fibre cable could have the 1.8Gbps service, and there's usually 8 ports per CBT, so the overall speed a CBT can passthrough is around 15Gbps at present
Though not 1.8 Gbit/s to every customer on the port at the same time of course.

OP: doesn't make any difference as is how all Openreach networks are built. Your splitter node just happens to be on a pole rather than underground so you can see it. Almost every full fibre provider in the UK has this architecture.
 
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Though not 1.8 Gbit/s to every customer on the port at the same time of course.

OP: doesn't make any difference as is how all Openreach networks are built. Your splitter node just happens to be on a pole rather than underground so you can see it. Almost every full fibre provider in the UK has this architecture.
I don't know, I've got the CBT to myself at present.
 
CBT and splitter aren't the same thing. A CBT has as many fibers coming in as connectors. A splitter takes 1 fibre and splits it into 30 (+ 2 spares), most splitter housings tabe 4 fibre in and split to 120 (+8 spares)

Being on your own CBT isn't that unusual, being the only one on a given PON would be more unusual, but if course happens in the early stages
 
Mmm sorry for confusion. When I say 'port' I mean the OLT port, nothing to do with a CBT.

Talking about CBT capacity is no different from talking about the capacity of a strand of fibre so entirely down to what's either side. In the case of Openreach at the moment that's GPON and almost never does a single CBT carry light from multiple OLT ports or have an entire OLT port to itself. If it does it won't for long as the build continues :)
 
For GPON which OR currently uses Each GPON trunk line coming out of an OLT port can support up to 2.4Gbps downstream and 1.2Gbps upstream.

Each GPON port/trunk line is split using a 32:1 ratio with 2 reserved for spares which means that 2.4Gbps down and 1.2Gbps up is shared by upto 30 premises.

The good news is that the passive infrastructure once installed does not need to be changed to get faster speeds just the active equipment at each end (OLT and ONT).

Many alt nets use XGSPON which is capable of just under 10Gbps up and down then of course there’s 25G PON and 50G PON which increase the capacity to 25 and 50Gbps respectively.
 
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As we're posting photos here's the Openreach one in the joint box near me. I should have done a better job, but it does illustrate how Openreach was able to fibre my area without doing any civils.
20240805_174602_20.webp
 
Been away for a while, but made me chuckle this thread.

Unless your neighbours etc never order FTTP in future, at some point you guys will lose the coveted "only *** in the village" claim for being only one on your CBT. Jesting. 😉
 
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