closed-circuit television; CCTV
Refers to a private, closed-circuit television system used for surveillance or internal broadcasting, not for public broadcast.
This apartment building has a closed-circuit television system installed, so residents can see the entrance on their monitors.
community antenna television; CATV; cable TV
A system that delivers television programming to multiple households via coaxial or fiber-optic cables; often used interchangeably with ケーブルテレビ in modern Japanese.
In mountainous areas, community antenna television is used as a means of receiving terrestrial broadcasts.
pay TV; subscription TV
Television service provided for a fee, often via cable; in Japanese, 有料放送 or ペイテレビ are more common for the general concept, but 有線テレビ can imply pay TV when the context is cable-based subscription services.
If you subscribe to pay TV, you can watch specialty channels.