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 48-port 10/100TX switching module provides 48 switched, 10/100-Mbps, full- or half-duplex ports. Ports have RJ-21 connectors for Category 5 cable. This module has 128K per-port packet buffers and a single fabric channel interface. The switching module is upgradable to support distributed forwarding with an optional Distributed Forwarding Card.