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, Connecticut, and Pennsylvania.  Cablevision also offers high-speed Internet connections (Optimum Online), as well as digital cable (iO), and VoIP 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.
The Madison Square Garden, L.P. subsidiary controls the Madison Square Garden arena in New York City, and the professional sports teams that play there—the New York Knicks, New York Rangers, and New York Liberty. The same company also owns the Hartford Wolf Pack, a minor-league professional hockey team affiliated with the Rangers, and operates (but does not own) two Connecticut sports venues, the Hartford Civic Center Coliseum and Rentschler Field.
Cablevision's sports holdings also include TV rights for the Knicks, Rangers, Liberty, New York Islanders, New Jersey Devils and Red Bull New York. These games are aired on their MSG Network and FSN New York cable channels.