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Chapter 3: Networking
Illustrations contained in this document are for representation only.
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Cable Modem (CM) Section
Cable Modem (CM) SectionCable Modem (CM) Section
Cable Modem (CM) Section
The cable modem (or CM) section of your gateway uses EURO-DOCSIS Standard cable modem
technology. EURO-DOCSIS specifies that TCP/IP over Ethernet style data communication be
used between the WAN interface of your cable modem and your cable company.
A EURO-DOCSIS modem, when connected to a Cable System equipped to support such
modems, performs a fully automated initialization process that requires no user intervention.
Part of this initialization configures the cable modem with a CM IP (Cable Modem Internet
Protocol) address, as shown in Figure 3, so the cable company can communicate directly with
the CM itself.
Networking Section
Networking SectionNetworking Section
Networking Section
The Networking section of your gateway also uses TCP/IP (Transmission Control Protocol/
Internet Protocol) for the PCs you connected on the LAN side. TCP/IP is a networking protocol
that provides communication across interconnected networks, between computers with
diverse hardware architectures and various operating systems.
TCP/IP requires that each communicating device be configured with one or more TCP/IP
stacks, as illustrated by Figure 4. On a PC, you often use software that came with the PC or its
network interface (if you purchased a network interface card separately) to perform this
configuration. To communicate with the Internet, the stack must also be assigned an IP
(Internet Protocol) address. 192.168.100.1 is an example of an IP address. A TCP/IP stack can