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What is the difference between full duplex and dual simplex? I can not really distinguish the difference. Is it the fact that in full duplex, data can be exchanged simultaneously in both channels while in dual simplex, it's only one at the time? Is PCI Express well a dual simplex?

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    \$\begingroup\$ Looks like this \$\endgroup\$ – AltAir Dec 24 '17 at 20:05
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Dual Simplex means the 2 lanes are simultaneous unidirectional, but hardware may be selected in either direction.

Full Duplex is also simultaneous unidirectional but by hardware design limited to opposing directions such as RS-232, USB 2

So Dual Simplex could be dual lanes for same direction for bandwidth doubling doubling such as USB 3 or configured as Dual Simplex in opposite directions.

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