From the Manufacturer: With advanced switching technology, the EtherFast 10/100 Ethernet Switches will boost your network performance with much more than just full duplex data transfer and dedicated bandwidth. They feature nonblocking, wire-speed switching that forwards packets as fast as your network can deliver them. Also included are Address Learning and Aging to prevent data transfer errors and Data Flow Control to help prevent packet collisions. The rack mountable switches include an Expansion Port that accepts an optional Fiber Module to let you grow your network by linking to other switches in full duplex mode up to 2000 meters (6560 feet) away. The compact switches are small enough to fit into any crowded office. No matter how intensive your network demands, the EtherFast 10/100 Ethernet Switches advanced chipsets support your needs with an affordable and efficient networking solution you can count on.