3COM - Network adapter - GBIC - Gigabit Ethernet - 1000Base-LX-1 port

Flexible Gigabit Ethernet Connections:
A Gigabit Interface Converter (GBIC) is an industry-standard modular transceiver that offers increased flexibility for Gigabit Ethernet connections. Use this GBIC to provide gigabit connectivity to a 3Com Switch 4007 or Switch 4007R, 3Com Switch 4005, 3Com SuperStack 3 Switch 4900 family, (Switch 4900, 4900 SX, 4924 or 4950), 3Com Switch 4050, or 3Com Switch 4060.