Each Contivity VPN Switch is a single hardware device, which provides routing, firewall, bandwidth management, encryption, authentication, and data integrity for secure tunneling across managed IP networks and the Internet. With Contivity VPN Switches, you can connect remote users, branch offices, suppliers, and customers with the cost and performance advantages of shared IP networks and the security and control you would expect from private networks. For enterprises, the Contivity VPN Switch taps the Internet to create a powerful, low-cost Virtual Private Network solution to replace expensive, dedicated wide area networks. For service providers, the Contivity VPN Switch is the perfect answer to capitalize on the growing market for managed IP VPNs - Intranets, Extranets, and remote access applications. The Nortel Networks Contivity 600 provides scalable, secure, manageable extranet access for up to 30 simultaneous users across the Public Data Network (PDN).