Define the layers of the international organization

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Reference no: EM1333541

Use short answers to explain the difference between:

o Rotary and Dual Tone Multi-frequency (DTMF)
o Wide Area Telecommunications Service (WATS) and leased lines
o Private Branch eXchange (PBX) and Centrex
o The layers of the International Organization for Standardization-Open Systems Interconnection (ISO-OSI) model

Reference no: EM1333541

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