The Cisco 1600 series is the proven choice for data access for small businesses and small branch offices. Together with its WAN interface cards and Cisco IOS software, the Cisco 1600 series delivers the flexibility, security, and functionality that small offices demand today and as networks evolve.Cisco 1600 routers connect Ethernet LANs to WANs via ISDN, asynchronous serial and synchronous serial connections, supporting Frame Relay, leased lines, Switched 56, Switched Multimegabit Data Service (SMDS), and X.25.