Apple AirPort Networks Anleitung zur Fehlerbehebung PDF herunterladen (Seite 28)

802.11ac, which functions only in the 5 GHz band, can employ

quadruple-wide channels that use 80 MHz of spectrum. This extra

width allows a more efficient radio encoding to boost data rates higher.

Other Uses of the 2.4 and 5 GHz Bands

The 2.4 GHz and 5 GHz bands weren’t empty before Wi-Fi networking

came along. 2.4 GHz is known as a “junk band” because it’s full of

approved uses that can conflict at times. Industrial sealers, for

instance, use heating processes that emit 2.4 GHz radiation. (There

are many other junk bands, too, most not used for networking.)

Problems with Wi-Fi networks often stem from your own or your

neighbors’ use

of conflicting technology, including 2.4 GHz cordless

phones, microwave ovens, nearby industrial sites, and wireless

cameras. The 5 GHz band has many fewer approved uses; primarily,

5.8 GHz cordless phones will be your enemy.

Throughput

The 5 GHz band offers consistent throughput—the amount of actual

data passing over the network exclusive of overhead used to transmit

it. With 2.4 GHz, however, throughput is all over the place. When

other technologies interfere in the 2.4 GHz band, Wi-Fi devices and

base stations are forced to slow down.

The highest possible 802.11n rate happens when two adapters use

the 5 GHz band with 40 MHz, and the highest 802.11ac rate happens

with 80 MHz channels.

Note: The highest rate for 802.11n is 150 Mbps in a wide channel

times the number of streams in that band. That’s a minimum of

150 Mbps for single-stream devices up to a maximum of 600 Mbps

for four-stream devices. With 802.11ac, it’s a minimum of 433 Mbps

when an 80 MHz channel is available, and up to 1.3 Gbps in an Apple

device. It could be much faster in future eight-stream devices!

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 Anleitung zur Fehlerbehebung Seite 28