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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They act as cheap low pass filters.
Alternating electric current induces magnetic field that opposes the change in electric current. Faster change (higher frequency) induces stronger field.
Adding loop of metal around the wire makes the effect stronger.
So the metal block will cause high frequencies to be attenuated in the wire. The block is made such that it mostly affects only frequencies that are higher than the frequencies used for data transfer.
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