Duplex patch cords are fiber optic cables that contain two strands—one for transmitting and one for receiving optical signals, allowing bidirectional communication between devices.

These cords are typically used in full-duplex systems such as Ethernet or Fibre Channel, where simultaneous send and receive operations are required.

Duplex patch cords often feature connectors like LC, SC, or ST in a joined pair, and are color-coded or keyed to maintain polarity and prevent cross-connection errors.

They are essential in structured cabling systems for linking switches, transceivers, and patch panels in high-speed networks.

Simplex patch cords are single-strand fiber optic cables designed for unidirectional signal transmission. Unlike duplex cords, they carry data in only one direction and are used in applications where bidirectional communication is not necessary, such as certain sensor systems or one-way data feeds.

Simplex cords consist of one fiber core and a single connector at each end, typically LC, SC, or ST. They are useful in scenarios where space, cost, or design constraints favor minimal cabling, and they can be deployed in parallel for separate transmit and receive paths if needed.

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