An Ethernet cable, also called a category 5 (Cat 5) cable, carries the broadband signals between your modem, router, computer, and other wired Internet-capable devices.
Using surge protectors for your power source only does not affect your service. If you do not purchase the right type of surge protector and make the proper connections with coaxial cables, you could have trouble using your Home Phone, receiving some channels on your Digital TV, using the My Services feature that allows you to check your service status, or experience some other kinds of service interruptions. Get the details here on the type of surge protector you need.