Cisco offers a wide variety of connectivity, expansion and upgrade modules to accommodate the range of application needs in customer networks. The network modules assure customers that they can choose a connectivity solution that fits their requirements. As modular components, they are easily and inexpensively field-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 1000BaseSX, LX/LH, and ZX GBICs, copper GBICs, or CWDM GBICs.