NBC Sports Regional Networks is the collective name for a group of regional sports networks in the United States that are primarily owned and operated by the NBCUniversal division of the cable television company Comcast. The networks were originally established as Comcast SportsNet (CSN), a unit of Comcast's cable television business, beginning with a network in Philadelphia which launched in 1997. Their operations were aligned with the national NBC Sports division following the 2011 acquisition of NBC Universal by Comcast. NBC Sports Regional Networks' business and master control operations are based in Englewood Cliffs, NJ.