i have a comcast 2003 black cable running from the pole to my box. i have a 30 ft. comcast 2000 black underground cable running from the box, along the roof, and through the rain gutter to the outside of the wall outlet. i have an 8 ft. white comcast 2005 cable running from there, to the spltter. i have a terayon HSI modem, and tv connected to the splitter. my tv reception is great, and my HSI speed is good, but i am wondering if the comcast 2000 cable is too old, and if i should replace it, with a newer cable for optimum performance?