In simplex mode, the sender is able to send data but cannot receive data, making it a mono-directional connection.

Advantages

AdvantageDescription
SimplicityData flowing only one way is far more simple than multidirectional
Cost-EffectiveIf data only needs to go one way, hardware can be simplified
No CollisionThere is no risk of collision on a simplex route as it only travels one way
Efficient for some applicationsSome setups (i.e. transporting keyboard input) only require single directional communication

Disadvantages

AdvantageDescription
Lack of bidirectional communicationSome applications are not possible (i.e. video calls)
Inefficient at complex tasksUnable to receive acknowledgements in return hence error checking is impossible