Comms query

[#1]

Anyone recognise this, know what it is?

[#2]

It is used to extend multi-core copper cable.

Usually found toward the bottom of the pole. I've seen them opened up when Openreach are tracing cable faults, saves them climbing the post.

[#3]

Gemini AI says

• Copper Cable Joint Enclosure: This is a watertight, heavy-duty shell used by Openreach (and other networks) to splice multi-pair copper distribution cables together on a utility pole.

• The Mechanism: It uses an internal gel-sealing system and those heavy-duty plastic tension clamps around the middle to create a completely weatherproof seal without needing special tools or heat-shrinking.

• Why it's there: It typically connects a larger underground or overhead copper trunk cable to the individual copper dropwires that feed into nearby houses for standard telephone and FTTC (Fibre-to-the-Cabinet) broadband.

[#4]

Thanks @Dan_the_Van that makes sense to me.