Discussion
How many number of transmission modes exists for data communication circuits ?
Answer: B
The key gives (B) 3.
The usual answer is three transmission modes: simplex (data flows one way only), half duplex (both ways, but one direction at a time) and full duplex (both ways at once). Every standard classification of a data communication circuit contains these three.
Some data communications texts add a fourth, full/full duplex, in which a station sends to one station while receiving from another. That is why 4 can be argued, but the key and the common classification give 3. Two and one would leave out one of the three basic modes.
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