Working with a Multifiber Source
Fiber Inspection Probe 107
Understanding Fiber Polarity
Understanding Fiber Polarity
The polarity of a multifiber patchcord refers to how the fibers are linked
between the transmitting (Tx) and receiving (Rx) connectors. The
application refers to the TIA 568 standard which defines three polarity
types: A, B, and C. Any other fiber mappings in a multifiber patchcord will
result in an unknown polarity type.
Type A: An MPO connector is inserted key up on one end of the cable
and key down on the other end. The fiber sequence is the same at
each end of the cable (1-1, 2-2, 3-3, and so on).
Type B: Both MPO connectors, on each end of the cable, are inserted
key up. The fiber positions are reversed at each end of the cable (fiber
1 is mated to fiber 12, fiber 2 arrives at fiber 11, and so on).
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