The FDDI is an emerging Standard fiber optic LAN technology suitable for backbone & high-performance workstation applications. This report describes the FDDI standards & the media that FDDI uses, & provides information about wiring for & effectively configuring FDDI LANs. Also describes the relationship of FDDI to the Governmet Open Systems Interconnection Profile (GOSIP) & discusses connecting FDDI to other networks. 40 figures & 10 tables.