Direction of Flow · Theory

Ch 1 · Sending Bits Down a Wire — card 2 of 2.

Data links also differ by which way data can flow:

• Simplex — one direction only (e.g. TV broadcast)
• Half-duplex — both directions, but one at a time (e.g. a walkie-talkie)
• Full-duplex — both directions at once (e.g. a phone call)

A walkie-talkie where only one person can speak at a time is an example of which mode?