Cisco-Linksys EF31SC 100BaseFX SC Fiber Module for EF3116 & EF3124 Connects multiple switches separated by distances of up to 2000 meters or 6560 feet Fiber-optic cables allow speeds of up to 200 Mbps Easy to set up--no software setup required Fully compact design for use with the Linksys EF3116 and EF3124 100BASE-FX IEEE 802.3u compliant; onboard mini-jumper grants operation in half or full duplex