Cisco 1600 series routers connect small offices with Ethernet LANs to the Internet and to company intranets using several wide-area-network (WAN) technologies: Integrated Service Digital Network (ISDN), asynchronous serial, and synchronous serial such as Frame Relay, leased lines, Switched 56, Switched Multimegabit Data Service (SMDS), and X.25. The Cisco 1600 series consists of four models, each of which has an Ethernet port, a built-in WAN port, and a slot for an optional second WAN port:
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