... mode, and support MDI/MDI-X connectionFiber Ports: 100BaseFX ports (SC/ST connector, optional)Single-mode: 20, 40,60, 80, 120Km, ... No.Descriptionunitif11-M1*TP+1*fiber port,multi-mode,2Km,12~36VDC,SC/FCSTPcsCi-if21-M2*TP+1*fiber port,multi-mode,2Km ... 36VDC,SC/FCSTPcsCi-if21-S2*TP+1*fiber port,single-mode,20Km,12~36VDC,SC/FCSTPcsTransmission distance and single fiber is optinal optical fiber converter ...