The Cisco 3640A server is equipped with four network module slots. Dial connectivity is supported with a series of network modules offering Integrated Services Digital Network (ISDN), Primary Rate Interface (PRI), ISDN Basic Rate Interface (BRI), integrated digital and analog modems, very high density asynchronous interfaces, four port Voice/Fax, 25-Mbps ATM, low-speed asynchronous/synchronous serial, and hardware compression assisted network modules. LAN and WAN connectivity are provided by a series of mixed-media cards supporting Ethernet, Token Ring, and a variety of WAN technologies. Routing applications are supported with high-density Ethernet and a single-port, autosensing, Fast Ethernet network module. Voice and Fax multiservice applications are also supported with integrated voice network modules and voice interface cards.