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individual communications networks, transmission systems, relay stations, tributary stations, and data terminal equipment ( dte ) usually capable of interconnection and interoperation to form an integrated whole. the components of a communications system serve a common purpose, are technically compatible, use
common procedures, respond to controls, and operate in union. telecommunications is a method of communication (e.g., for sports broadcasting , mass media , journalism , etc.). communication is the act of conveying intended meanings from one entity or group to another through the use of mutually understood...
https://en.wikipedia.org/wiki/Communications_system