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Definition: cable/DSL gateway

A device that connects multiple computers to a cable or DSL line for Internet access. Also called a "residential gateway," "modem/router," "home gateway" and "Internet gateway," it includes a modem for the cable or DSL service, an Ethernet switch to connect (typically four) computers by wire and a router. The device may also include an access point for Wi-Fi, in which case it is a wireless router and modem in one unit. See wireless router, cable modem and DSL modem.

A DSL Gateway
This unit from Zoom Telephonics combines a DSL modem, switch and router in one appliance. Most routers for homes and small offices include a firewall.