Cisco pays special attention to its network accessories, which are the foundation stone of the whole network system. The Company offers a variety of connectivity, expansion and upgrade options to accommodate the customer specific needs. Cisco's components are easily and inexpensively upgradeable as customer requirements change.The 16-port Gigabit Ethernet switching module provides 16 switched, full-duplex Gigabit Ethernet ports that you can configure with any combination of 1000BASE-SX, LX/LH, and ZX GBICs. Ports have SC-type connectors for MMF and SMF. The WS-X6516-GBIC module also has enhanced QoS features.