Apple AirPort Networks Troubleshooting Guide download pdf (Page 27)

Pick the Right Place and

the Right Channel

This chapter helps you tune your network for optimum performance.

It starts by helping you understand more about the portion of the radio

frequency spectrum that your base station uses and how to determine

the right channel to use in each frequency band. After that it explains

how to

Pick Compatibility and Set a Channel.

Finally, you’ll learn how to Pick the Right Place for a base station with

General Testing Advice as well as details on Testing from Client to Base

Station and Testing from Base Station to Client.

Note: Apple added simultaneous dual-band radios to the early 2009

Extreme and Time Capsule and the 2012 Express.

Spectrum Trade-offs

Shortly, I explain how to select channels for a base station. To make

the best choice, you may need some background on spectrum and

channel choices. (If you don’t know the basics of spectrum bands and

channels, read Wi-Fi Spectrum before proceeding here.)

Let’s begin by comparing the two bands. The 2.4 GHz band is crowded

with Wi-Fi networks, Bluetooth devices, and other uses; the

5 GHz

band is relatively empty—in the

United States, the band has almost

seven times the amount of frequency available in 2.4 GHz. Further,

Apple restricts what were once called wide channels to the 5 GHz

band in 802.11n in order to avoid treading on 2.4 GHz networks.

These broader channels in 802.11n use twice the amount of spectrum

(40 MHz) and thus can achieve twice the data throughput.

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Apple AirPort Networks Troubleshooting Guide Page 27