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Because wireless networks use radio waves, you may be concerned about health issues. Fortunately, research shows that the output power of wireless networks is much lower than cell phones, and there are no of cial reports of wireless networks causing any medical problems. However, as a precaution, you shouldn t touch the antenna of a wireless card or router while they are being used.
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Figure 11-3: Using a wireless network in the kitchen
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If you are installing your own wireless network, it is helpful to understand the big picture. Even if you re not technologically inclined, understanding the basic workings of your wireless network will provide you with some common sense in case you run into any problems. Here are some components and concepts you need to know:
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Wireless card: Each computer on the network must have a wireless card correctly installed and con gured in order to send and receive wireless signals. These cards are easy to install and con gure (as you will learn in 13). Wireless router: A wireless router is the main hardware in a wireless network. It links with a broadband modem to provide the network with a high-speed Internet connection. The router also sends radio signals that enable computers with wireless cards to connect to your network. Medium access: The wireless cards take turns sending data to and from each other over the air waves. Before a wireless card can transmit data, it must rst analyze the air and determine whether another wireless card is transmitting a signal. If there is no signal present, the wireless card can send data. If it detects a signal, the card waits and sends the data later. This listen-before-transmit method regulates access to the air and only allows one wireless card to send data at any given time. Traf c ow: In most networks, the digital traf c going from one wireless computer to another passes through a wireless router. For example, when Sierra sends a digital music le from her computer to Madison s computer, her computer transmits the le to the wireless router, and then the router sends it along to Madison s computer. Figure 11-4 shows a simple diagram of the way data ows across a network. Ad hoc wireless network: This type of network allows computers to communicate wirelessly with each other without using a router.You can swap les anywhere without having to connect to a wireless router (see Figure 11-5).
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Figure 11-4: Example of traf c ow on a wireless network
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Figure 11-5: Computer users on an ad hoc wireless network
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Most older computers do not have wireless cards, so those cards must be purchased separately. However, if your computer is relatively new, it might already have a wireless card installed.You can nd out via Windows or, if that doesn t work, you can look at your hardware, as described in the following sections.
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Follow these steps to use Windows to see if you have a wireless card:
1. Right-click the My Computer icon on your desktop. If this
icon is not available, click the Start button in the lower-left corner of Windows and click My Computer. If you can t nd the My Computer icon anywhere, do the following: a. Right-click in the empty space on your desktop. b. Select Properties. c. A window opens. Click the Desktop tab. d. Near the bottom of the window, click the Customize Desktop button. e. Another window opens. On the General tab, beneath Desktop Icons, place a checkmark in the My Computer box. f. Click the OK button. g. You will be returned to the previous screen. Click the Apply button. h. Click the OK button. i. The My Computer icon appears on your desktop. Right-click it.
2. 3. 4. 5.
Select Properties. A window opens. Click the Hardware tab. Click the Device Manager button. Click the + (plus sign) located next to the Network Adapters category. If there are icons under Network Adapters, you need to gure out what type they are. An Ethernet card (used with a traditional, wired network) has