Cablevision Systems Corporation is an American cable television company. It is the 5th largest cable provider in the USA, with most customers residing in New York, New Jersey and Connecticut. http://www.ncta.com/ContentView.aspx?contentId=73 Cablevision also offers high-speed Internet connections (Optimum Online), as well as digital cable (iO), and Vo IP phone service (Optimum Voice) through its Optimum brand name. Furthermore, Cablevision now offers Optimum Online Wi-Fi, which is available throughout the country to existing Optimum Online customers.

Cablevision, formerly Electrovision de La Tuque, is a cable television and Internet provider in Canada. The company predominantly serves the Abitibi-Témiscamingue area, though it serves other parts of Quebec and Ontario as well.