The Cisco Services Performance Engine (SPE) allows you to protect your initial investment for a longer time period and scale router performance as your network and branch-office needs grow. The Cisco 3900 Series offers embedded hardware encryption acceleration, voice- and video-capable DSP slots, optional firewall, intrusion prevention, call processing, voicemail, and application services. In addition, the platforms support the industry's widest range of wired and wireless connectivity options such as T1/E1, T3/E3, xDSL, copper, and fiber Gigabit Ethernet. The Cisco 3900 Series offers superior performance and flexibility for flexible network deployments from small business offices to large enterprise offices-all while providing industry-leading investment protection.