Designed for the demanding requirements at the core backbone of enterprise networks, the 3Com Switch 4070 delivers a unique combination of performance, availability, and flexibility. The switch's durable metal chassis a compact, 2RU-high rack-mountable unit is equipped with 24 SFP (Small Form Factor Plug-in, or ""mini-GBIC"") ports, accommodating 3Com 1000BASE-SX SFP (3CSFP91) and 1000BASE-LX SFP (3CSFP92) transceivers. Mix and match the population of SFPs so as to populate the switch to suit your port count and media needs. Fault-tolerance features include modular, load-sharing, hot-swappable power supplies; modular, hot-swappable fan trays; and hot-swappable GBIC transceivers. You can install a second power supply for added power redundancy. The 3Com Switch 4070 supports 3Com Gigabit Multilayer Switching software, which offers feature-rich Layer 2 functionality, Layer 3 switching for IP networks, and advanced traffic prioritization and security capabilities to accommodate the ever-growing requirements of core Gigabit backbones.