The modem should be fine. I'd be more concerned about the coax and linkages leading up to it. This includes the drop from the pole/ped to your house, any splitters, and any/all terminators on the coax ...

Ok so im not to good with cable line/type and all that stuff. I am looking to get a new modem I know how to do that my problem is I will need some more cable line and an a adapter, but I do not know ...