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) version allows customers to connect sites with link spans of a maximum of 80Km, while the OC-48c intermediate-reach (IR) version of the OC-48c interface allows customers to connect sites with link spans up to 15Km.The ATM OC-48c interface modules are designed specifically to meet the demanding needs of large enterprise and service provider networks that require high capacity multiservice links between sites.