SCALANCE X accessory STP 991-1LD, Pluggable for SCALANCE XM-400, 1x 100 Mbit/s ST/BFOC port, optical, single-mode optical up to max. 26 km.
6GK5991-1AC00-8AA0 – SCALANCE X accessory STP 991-1LD, Pluggable, Multimode plug-in insert
SCALANCE X accessory STP 991-1LD, Pluggable for SCALANCE XM-400, 1x 100 Mbit/s ST/BFOC port, optical, single-mode optical up to max. 26 km