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Bidirectional Signals

It is not entirely true that a port can only be Input or Output. Some ports are "bidirectional" (duplex) which is the case of Ethernet, RS-232 and others. Green Book concerns about "Bidirectional Signals"; ports are kept into the Inputs/Outputs set.

When you add a port which Signal Type is bidirectional, you are free to define that port type as Input or Output. As a convention, we suggest to define Ethernet Switches ports as Outputs and computers NIC ports as Inputs.