cable system vs cable television

cable system and cable television both are nouns.

Word	Noun	Adjective	Verb	Adverb
cable system	Yes	No	No	No
cable television	Yes	No	No	No

As nouns, cable system and cable television are synonyms defined as:

cable system and cable television: a television system that transmits over cables

Other synonyms of cable system include cable, cable television service.

cable system (noun)	cable television (noun)
a television system that transmits over cables	a television system that transmits over cables
	television that is transmitted over cable directly to the receiver