Introduction to Data Communications
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Half-Duplex: data flows in both directions but only one direction at a time on the data communication line. Ex. Conversation on walkie-talkies is a half-duplex data flow. Each person takes turns talking. If both talk at once - nothing occurs!


Bi-directional but only 1 direction @ a time!

HALF-DUPLEX

Full-Duplex: data flows in both directions simultaneously. Modems are configured to flow data in both directions.


Bi-directional both directions simultaneously!

FULL-DUPLEX

Introduction to Data Communications
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