If you have cable TV at home, then depending on where you live in the world it may be possible for you to enjoy the benefits of a cable modem (if your not doing so already). You are probably already aware that a cable modem is a device that is designed to provide a broadband Internet connection without the use of a phoneline. But, have you ever wondered exactly how cable modems work? If so, then read on! This article is designed to inform you exactly that, plus a little more on the side ;-) However, some of this article delves into technical depth so if you have trouble understanding parts of this article then please do consult the Talkbroadband Forums.

Cable Modem Types:

External Cable Modems:


External meaning outside of your computer, an external modem is a small box that can provide a computer with an Internet connection through either usb or ethernet. As of recent times, most cable modems do come with USB ports installed as well as the usual Ethernet port. If you have an external cable modem and wish to use Ethernet to connect it to your computer, you will need to install a NIC (Network Interface Card) inside your computer.

Internal Cable Modems:


Internal cable modems come in the form of a PCI (Peripheral Component Interconnect) bus card for PC's. There are alternative standards (PCMCIA devices for example) for Apple Mac's and laptops. There are certainly disadvantages when using internal cable modems. For instance, if you want to power down just the cable modem itself, then it would mean completely shutting down the computer.

Set Top Box Integrated Cable Modems:


In some instances a cable TV operator will issue you a set-top box with an in-built cable modem. This type of cable modem is commonly used for services like interactive TV and Internet via your television. However, there are a number of companies that use this type of cable modem to supply Internet access to your computer. Connecting a computer to the set top box cable modem via cat5 Ethernet cable will also provide Internet access. See diagram below: