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The side-B partner for SM321A-2: a single-fiber link up to 2 km.
SM321B-2 is the second half of a single-fiber pair: it sits at the opposite end of the line from an SM321A-2 module. Together they raise a gigabit channel over one fiber at up to 2 kilometers. Typical uses — links between buildings on a plant site, connecting a remote CCTV node, a trunk between floor switches.