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Module 1: Physical Layer & Data Communication

20222m

Physical layer provides

(i) mechanical specifications of electrical connectors and cables
(ii) electrical specification of transmission line signal level
(iii) specification for IR over optical fiber
(iv) All of the above

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(iv) All of the above

The Physical layer covers everything needed to physically move raw bits across a medium: mechanical specs (connector/cable shape and pin layout), electrical specs (voltage levels, signal timing), and specifications for the transmission medium itself, including optical/IR links. So all three listed items fall under its scope.

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