Computer Science for IGCSE & O level - Data Transmission (Section 10 - No. 41)
In half-duplex data transmission, data can be sent...
In one direction only.
Simultaneously in both directions.
In both directions but not at the same time.
Only over short distances.
Giải thích
Half-duplex mode occurs when data can be sent in BOTH directions but not at the SAME TIME.