... X connection; 100BaseFX supports single-/multi-mode, SC/ST connector, optional.Ck-if11/21 adopt industry stard design, ... RoHS approvals Part No.Descriptionunitif11-M1*TP+1*fiber port,multi-mode,2Km,12~36VDC,SC/FCSTPcsCi-if21 ... 12~36VDC,SC/FCSTPcsCk-if11-S1*TP+1*fiber port,single-mode,20Km,12~36VDC,SC/FCSTPcsCi ... -if21-S2*TP+1*fiber port,single-mode,20Km,12~36VDC,SC/FCSTPcsTransmission ...