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 ATM OC-48c super port adapter modules are dual-slot, full width interface modules available for the Catalyst 8540 MSR. The OC-48c long-reach (LR) allows customers to connect sites with link spans of a maximum of 80Km.