What can cable companies actually see?

sb1980

Newbie
I've looked but cant find an answer to this.

Can the main UK cable company actually see if you are using different equipment to the stuff they supplied?

As well, if said cable company is also providing your internet, can they not see that you're accessing one of the lines from a line supplier?

Have just bought a H2H, working fine with a line I obtained from a well known auction company, but I'm just curious as to what my cable provider can actually see - i.e do they know I am accessing their feed via different equipment? and do they know I am connecting to some dudes server?
 
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