Comcast’s Xfinity service delivers a high-speed Internet connection over the coaxial cables that they have installed in millions of American households using a system called the Data Over Cable Service Interface Specification. Xfinity cable connections can be extremely fast, with download speeds reaching as fast as 105Mbps as of March of 2013. However, Xfinity cable connections are also finicky and many different factors can impact the actual speed that you see at your router. Writer Bio
