The Cisco 3600 series is a family of modular, multifunction access routers for medium and large-sized offices and smaller Internet Service Providers (ISPs). With more than 70 modular interface options, the Cisco 3600 family provides solutions for voice/data integration, virtual private network (VPN) dial access, and multiprotocol data routing. The high-performance, modular architecture of the Cisco 3600 series protects a customer's investment in network technology and integrates the functions of several devices into a single, manageable solution.The Cisco 3600 bundles, installed with the digital modem network modules and PRI/BRI interfaces, offer the most flexible, scalable, manageable, and high-performance dial access solutions available in the market today. The Cisco 3640 BRI modem bundles utilize the popular 1E2W network modules to provide Ethernet LAN connectivity for up to 16 concurrent remote users, utilizing the four or eight port BRI network module.