Description Cisco QSFP-100G-ER4L-X Compatible is a 100GEBASE-ER4 QSFP28 module reaching 30km (no FEC) or 40km (with FEC) over SMF. Operating at 1310nm with duplex LC connectors, it features full DOM support for monitoring signal stability over long distances. This module is engineered for high-availability 100GbE backhaul in regional and metropolitan fiber networks.
