When looking at the fiber end-face, fiber positions are numbered from left to right starting with P1. The P1 position is also commonly marked with a white dot on the side of the connector housing. Fiber polarity is the direction that light signals travel from one end of a fiber optic cable (link) to the other. Because fiber duplex links rely on matched transmit-receive alignment, polarity determines how cables, connectors. The TIA-568-C. 0 Standard (Commercial Building Telecommunications Cabling Standard) defines the A-B polarity scenario for discrete duplex patch cords, with the premise that transmit (Tx) should always go to receive (Rx) — or "B" should always connect to "A" — no matter how many segments there are. This refers to the placement of the notches that ensure alignment during connector mating on either end. Below are 6 fundamental rules for managing fiber optic.
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