WAN port

(Wide Area Network port) The socket on a network device that is wired to an external network, which is typically the Internet. In the home and small business, a WAN port is an RJ-45 Ethernet port on a router that is wired to a cable or DSL modem. On small routers, the WAN port may be labeled simply "Internet." In the larger enterprise, a WAN port may hook up to a T3 line or other wide area network service. Contrast with LAN port. See RJ-45.

RJ-45 Ethernet Plug and Socket

RJ-45 plugs and sockets look like telephone plugs and sockets, only larger. Although all network routers and switches have RJ-45 ports, most of them are for local network connections and not WAN ports.