Energy efficiency The Cisco 3900 series offers intelligent power management & allows the customer to control power to the modules based on the time of day. Platform flexibility & ongoing development of both hardware & software capabilities lead to a longer product lifecycle, lowering all aspects of the total cost of ownership, including materials & energy use. Modular platform The Cisco 3900 series router is highly modular platforms with several types of module slots to add connectivity & services for varied branch-office network requirements. Multi-gigabit fabric The Cisco 3900 series introduces a multi-gigabit fabric that allows for efficient module-to-module communication, enabling tighter services interactions across modules while reducing the overhead on the router processor. TDM interconnectivity fabric Unified communications services in the branch office are significantly enhanced with the use of TDM interconnectivity fabric in the router architecture, allowing for scaling of DS-0 channel capacity.