100-SM-LC-L describes an enhancement to American National Standard for Information Technology - Fibre Channel - Physical and Signaling Interface (FC-PH), ANSI X3.230-1994, to American National Standard for Information Technology - Fibre Channel - Physical and Signalling Interface-2 (FC-PH-2) ANSI X3.297-1997, and to American National Standard for Information Technology - Fibre Channel - Physical and Signalling Interface-3 (FC-PH-3), ANSI X3.303-1998, and is an addendum to the FC-PH, FC-PH-2, and FC-PH-3 documents. This document is an extension to the FC-PH, FC-PH-2, and FC-PH-3 standards and describes a low-cost 10-km optical interface.