Cisco 3660 Router 3660-MB-1FECisco 3600 Series 3660 Router 3660 MB 1FE, 3660 MB 1FE, 3660 Router product information. The Cisco 3600 series is a multifunction platform that combines dial access, routing, and LAN to LAN services and multiservice integration of voice, video and data in the same device. As a modular solution, the Cisco 3660 series has the flexibility to meet both current and future connectivity requirements. The Cisco 3600 series is fully supported by Cisco IOS