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In the world of telecommunications there are three categories of communication systems: duplex, half duplex, and simplex. Duplex can send and receive information at the same time; an example of a duplex device would be a cell phone. A half-duplex...

In the world of telecommunications there are three categories of communication systems: duplex, half duplex, and simplex. Duplex can send and receive information at the same time; an example of a duplex device would be a cell phone. A half-duplex device can send and receive information but not simultaneously, rather they have to take turns sending or receiving; and example of this would be a walkie-talkie. Simplex only allows information to flow in one direction and only one direction like a car radio or a beeper.

Fiber optic patch cords come in two of the three standard types: Duplex and Simplex. A duplex patch cord has two fiber optic cables in separate housing but the housings are fused together and the two cables terminate onto a dual patch cord which plugs into a duplex patch panel. A simplex is just half of a duplex, just one fiber optic cord. Because fiber optic can only communicate in one direction people often opt for the duplex because it simplifies how many patch cords are necessary.

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