(Fiber-Optic Cable Intermatability Standard) Specifications for cable connectors from the TIA that define the requirements for interconnection between fiber-optic plugs and sockets. Following are some of the common FOCIS standards. FOCIS-1 See SMA connector. FOCIS-2 See ST connector. FOCIS-3 See SC connector. FOCIS-4 See FC connector. FOCIS-6 See Fiber Jack.