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 MGX-AXSM-16-155/B is a double-height dual-role card that serves as a trunk or a UNI, and provides 16 OC-3c or STM-1c, 16 lines at 155 Mbps.