Apple AirPort Networks Instrukcja Naprawy Pobierz pdf (Strona 20)

Note: The adapters in a Mac can, in fact, connect to all the 23 legal

channels in the United States. Some companies may deploy Wi-Fi

networks using non-Apple base stations that allow the use of all

23 channels, as they’re more likely to be available inside buildings

without hitting military and weather radar rules.

Note: In March 2014, the FCC voted to add another 100 MHz for

unlicensed wireless use,

about five channels’ worth, in the 5 GHz

without the same sort of restrictions that have plagued the 15

channels noted above. However, it is almost certain that no existing

802.11ac or n hardware will work in that new band. We may be

waiting for some time before those are available in practical terms.

Apple also chose to limit 802.11n’s wide channels to the 5 GHz band.

Wide channels are an 802.11n feature that uses two adjacent channels

at once—this doubles the raw bandwidth. Apple’s choice was an option

under the Wi-Fi Alliance’s certification rules, but some vendors offer

wide channels in 2.4 GHz.

In practice, 2.4 GHz wide channels don’t work well, because 802.11n

devices tread lightly to avoid interfering with other networks. In a real-

world situation, you would likely see an improvement in throughput

with 2.4 GHz wide channels only if no other Wi-Fi networks were

nearby.

Even wider channels are possible in 802.11ac: the equivalent of four

and eight normal channels in 5 GHz, the only band in which 802.11ac

functions. Apple supports only the four-channel-wide flavor, which

makes sense as there aren’t eight adjacent channels available for

consistent use in 5 GHz.

Click here to buy the full 196-page “Take Control of Your Apple Wi-Fi Network” for only $20!

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Apple AirPort Networks Instrukcja Naprawy Strona 20