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Regular SFP optical transceivers use two fiber strands to operate. This category includes all types of SFPs using two strands: one for Tx and one for Rx. This category has most common multi-mode and single-mode versions but also covers long-haul options. You can find SX, LX, LHX, ZX and ZHX compatible SFPs in this category with distances up to 120Km, but also 155M, 622M or multi-rate 2.5G and 4G SFPs, used in SONET, SDH or Fibre Channel networks.