Apple AirPort Networks Guía para resolver problemas descargar pdf (Pagina 47)

Overcome Interference

A frustrating part of Wi-Fi networking is that you can’t control

your “air space.” All too often, neighboring Wi-Fi networks and other

emitters cause reception problems in areas that otherwise would have

good reception. If your network’s performance varies by time of day

or even by the minute, the ideas in this chapter may help you identify

the problem.

Do Some Basic Testing

What you test for varies by band. Keep reading after the tests for some

suggestions for how to fix found problems.

For 2.4 or 5 GHz:

• Run iStumbler to determine whether other networks are running

nearby. iStumbler scans for networks and can display their

characteristics, such as signal strength and whether security is

enabled. It can’t tell you more general info about signals being

generated in the

spectrum range, however.

• If you’re desperate for a solution, check out Wi-Spy, a relatively

inexpensive spectrum analyzer that comes in 2.4 GHz only and

2.4 and 5 GHz versions. It can show whether there’s interference

beyond Wi-Fi. (See Testing from Client to Base Station.)

For 2.4 GHz only:

• Investigate your cordless phones and microwave oven as culprits—

they can both create static on the

Wi-Fi line. Do you have problems

only when talking on the phone or making popcorn? There you go.

• Is your Wi-Fi network near a hospital, or light or heavy industry?

Some medical and industrial devices use

the 2.4 GHz band,

including microwave sealers that close bags of potato chips. You

might need to use wired Ethernet or upgrade to computers that

can use the 5 GHz band to overcome that problem.

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Apple AirPort Networks Guía para resolver problemas Pagina 47