SMC Networks Barricade SMC2404WBR - Manual (Page 5)

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Cable Modem
Most users who have cable modems are set up for DHCP. These include Internet
Service Providers (ISP) such as Comcast, AT&T Broadband and Rogers Cable
service. At most, your ISP may have contacted you to register the Media Access
Control (MAC) address of your network interface card (NIC) in the machine. A
cable modem is used to connect a computer to a cable service that provides
Internet access. Cable modems can dramatically increase the bandwidth between
the user's computer and the Internet service provider. However, cable service is a
shared mode of Internet connectivity, and thus the speed will vary depending on
how many people on that cable segment are using the Internet at the same time.
The cable modem transmission system (CMTS) is responsible for converting
radio frequency (RF) signals into data packets for the Internet.
Setup Wizard for Cable Connection