Nortel DM1401A33 (telecommunications transmission and networking portfolio) Power Supply

The Nortel DM1401A33 is a Contivity Extranet Switch 4500, a mid-range VPN gateway appliance rated for up to 5,000 concurrent tunnels, fitted with five PCI expansion slots, dual 10/100Base-TX ports, dual redundant power supplies, and server-class internal storage. The Contivity 4500 sits above the smaller Contivity 1100/1700-series appliances already confirmed in this catalogue and below the largest Contivity models in Nortel’s VPN gateway range, aimed at medium-to-large sites terminating a substantial number of IPsec site-to-site or remote-access VPN tunnels. Its PCI expansion slots allowed additional interface or encryption-acceleration cards to be fitted as a site’s requirements grew, and the dual power supply and RAID-capable storage configuration reflect its positioning as a resilience-focused appliance for production VPN termination rather than an entry-level unit. Contivity appliances were a widely-deployed Nortel product line through the 2000s, and a number remain in service, particularly on long-running site-to-site VPN infrastructure that has not been re-platformed onto newer gateway hardware. Tech-Star (UK-based, shipped worldwide) stocks Contivity appliances for ongoing VPN infrastructure support.