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Chapter 3 Wi-Fi 26
Channel width: The maximum channel width. Beginning with 802.11n, channels can be
combined to create a wider channel that allows for more data to be transmitted during a
single transmission. With 802.11n, two 20 MHz channels can be combined to create a 40 MHz
channel. With 802.11ac, four 20 MHz channels can be combined to create an 80 MHz channel.
Guard interval (GI): The guard interval is the space (time) between symbols transmitted from
one device to another. The 802.11n standard denes the option of a short guard interval of
400ns that provides faster overall throughput, but devices may use a long guard interval
of 800ns.
Model 802.11
compatibility
and frequency
band
Maximum
Transmit Rate
Spatial
streams
MCS index Channel
width
Guard
interval
iPad Air 2 802.11ac/n/a
@ 5 GHz
802.11 n/g/b
@ 2.4 GHz
866 Mbps 2 9 (VHT)
15 (HT)
80 MHz 400 ns
iPad mini 3 802.11n @ 2.4 GHz
and 5GHz
802.11a/b/g
300 Mbps 2 15 (HT) 40 MHz 400 ns
iPhone 6 Plus
iPhone 6
802.11ac/n/a
@ 5 GHz
802.11 n/g/b
@ 2.4 GHz
433 Mbps 1 9 (VHT)
7 (HT)
80 MHz 400 ns
iPhone 5s
iPhone 5c
iPhone 5
802.11n @ 2.4 GHz
and 5GHz
802.11a/b/g
150 Mbps 1 7 (HT) 40 MHz 400 ns
iPhone 4s
iPhone 4
802.11n @ 2.4GHz
802.11b/g
65 Mbps 1 7 (HT) 20 MHz 800 ns
iPad Air
iPad mini
with Retina
display
802.11n @ 2.4GHz
and 5GHz
802.11a/b/g
300 Mbps 2 15 (HT) 40 MHz 400 ns
iPad (4th
generation)
iPad mini
802.11n @ 2.4GHz
and 5GHz
802.11a/b/g
150 Mbps 1 7 (HT) 40 MHz 400 ns
iPad (1st,
2nd, and 3rd
generation)
802.11n @ 2.4GHz
and 5GHz
802.11a/b/g
65 Mbps 1 7 (HT) 20 MHz 800 ns
iPod
touch (5th
generation)
802.11n @ 2.4GHz
and 5GHz
802.11a/b/g
150 Mbps 1 7 (HT) 40 MHz 400 ns
iPod
touch (4th
generation)
802.11n @ 2.4GHz
802.11b/g
65 Mbps 1 7 (HT) 20 MHz 800 ns
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