STM1 ELEC SFP 1-port STM-1 SDH Electrical Module, 1.0/2.3 Coaxial Connector (Type A Coupling). 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 (90-9785

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