3Com - Expansion module - Expansion Slot - Gigabit Ethernet - 1000Base-SX-1 port

Single Port Fiber Gigabit Ethernet Connection:
Scale the performance of your Ethernet/Fast Ethernet network by adding this module to the 3Com SuperStack 3 Switch 4400 or Switch 4400 SE 10/100 managed switch. This module provides a resilient, short-haul, high-performance inter-workgroup or workgroup-to-backbone Gigabit Ethernet connection.