Red Seal Electrician Practice
Signalling and communicationQuestion 133 of 1506

How is full-duplex communication often achieved?

  1. One wire pair with a token passed to each side in turn
  2. One fibre that is cut in half and joined by a gateway
  3. A simplex line with a switch that reverses the direction
  4. Separate channels or wire sets for each direction
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Correct answer: Separate channels or wire sets for each direction

In radio links, a separate frequency is used for each direction.

Source: Lessons in Electric Circuits IV: Digital (Kuphaldt), 14.3: Data Flow

Practice signalling and communication

Questions last reviewed: 18 October 2026