CRC is Cyclic Redundancy Check a test to be sure the packet sent is the same as the packet received, without line noise added in transit.
You may wish to be sure your DSL phone line inside your house is as new and as direct as possible (no extensions, if possible) past the demarc box, you are not allowed to replace parts, so if it is the phone company's line that adds the errors, you cannot effect them.
I tried to remain child-like, all I acheived was childish.
I am in the US in a single family dwelling, the demarc (I think it is short for point of demarcation) is a grey box that you can open half of, from there on into the house the wiring is your respnsibility, from the side only the phone company can open back to the pole and on the their office, you can't touch.
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