Watching an LGR video and he mentioned it. I always assumed they were just some kind of tension relief or a splicing point for repairs or something, literally never knew they had a more technical purpose.
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I’ll try to make this a true eli5 answer.
When information moves through the wire, it moves like a stream of water, in a “current”.
The current can pick up stray bits of trash on the river bank, dirtying up the signal.
The cylinder acts like a concrete culvert, designed to stop trash from falling in the river; and a net that catches the trash as it flows through.
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