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Write a 2 to 3 paper describing the telecommunication systems used in your workplace.

Write a 2 to 3 paper describing the telecommunication systems used in your workplace. Use short answers to explain the difference between:
Rotary and Dual Tone Multifrequency (DTMF)
Wide Area Telecommunications Service (WATS) and Leased lines
Private Branch eXchange (PBX) and Centrex
The layers of the International Organization for Standardization Open Systems Interconnection (ISO OSI) model

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