Operation Manual

Handleiding Internet van Ziggo 82
5. Networking
5.1 Communications
Data communication involves the flow of packets of data from one device to
another. These devices include personal computers, Ethernet, cable modems,
digital routers and switches, and highly integrated devices that combine
functions, like the Wireless Cable Gateway.
The gateway integrates the functionality often found in two separate devices
into one. It’s both a cable modem and an intelligent wireless voice gateway
networking device that can provide a host of networking features, such as NAT
and firewall. Fig.3-1 illustrates this concept, with the cable modem (CM)
functionality on the left, and networking functionality on the right. In this figure,
the numbered arrows represent communication based on source and
destination, as follows:
figure 67: Communication between your PCs and the network side
5.2 Type of communication
1. Communication between the Internet and your PCs Example: The packets
created by your request for a page stored at a web site, and the contents of
that page sent to your PC.
2. Communication between your cable company and the cable modem side.
Example:
When your cable modem starts up, it must initialize with the cable company,
which requires the cable company to communicate directly with the cable
modem itself.