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Please specify your question about OC3/STM1 IR SFP clei 1-port OC-3/STM-1 SONET/SDH Optics Module, IR-1 / I-1, 1310 nm, LC Connector. Can be used in the Quad OC3/STM1 SFP Cell Relay card (90-8687-25) or OC3/STM1 1:N Working I/O (90-9785-02) (in ESE R5.X) or OC3/STM1 1:N Protecting I/O (90- *