Look at the cable feed coming into your house, alot of people
have one feed in. It is then split "using a splitter"one feed in,two feeds out.
One goes to your box another to your modem/router.
If your signal quality is less than say about 70% then
plug the in feed in (by-pass the splitter)direct to the box during the re scan.
Most of the time it isn't a problem, but if you have a low signal it should work.