fiber-optic transmission system vs FOTS

fiber-optic transmission system and FOTS both are nouns.

Word	Noun	Adjective	Verb	Adverb
fiber-optic transmission system	Yes	No	No	No
FOTS	Yes	No	No	No

As nouns, fiber-optic transmission system and FOTS are synonyms defined as:

fiber-optic transmission system and FOTS: a communication system using fiber optic cables

Other synonyms of fiber-optic transmission system include fibre-optic transmission system.

fiber-optic transmission system (noun)	FOTS (noun)
a communication system using fiber optic cables	a communication system using fiber optic cables