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Chapter 3 Wi-Fi 25
The Wi-Fi network design for high density is more complex, due to the higher density of
mobile devices. Because of the large number of devices in each classroom, one access point per
classroom might be required. Multiple access points should be considered for the common areas,
to provide adequate coverage and capacity. The number of access points for the common areas
may vary, depending on the density of Wi-Fi devices in those spaces.
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Important: A pre-install site survey should always be performed to determine the exact number
of access points needed and where those access points should be mounted. A site survey also
determines the proper power settings for each radio. Once the installation of the Wi-Fi network
is complete, a post-install site survey should be performed to conrm the Wi-Fi environment.
For example, if designing a network to support a large number of people in a building it is best
to validate the design with people in the building. (Or, if classroom doors will be closed when the
network is in use, the door should be closed when validating the design as well.)
Sometimes it is desirable to create multiple SSIDs for dierent purposes. For example, a guest
network may be required. Care should be taken to avoid creating too many SSIDs, as the
additional SSIDs cause additional bandwidth usage.
Design for Applications
Apple products use multicast networking for services like AirPlay and AirPrint. Therefore,
multicast support should be part of the design plan. For information about how to prepare your
network for Bonjour, see Bonjour.
Wi-Fi standards in iOS devices
Wi-Fi specications for Apple iOS devices are detailed in the list that follows, which includes this
information:
802.11 compatibility: 802.11ac, 802.11n, 802.11a, 802.11b/g
Frequency band: 2.4 GHz or 5 GHz
Maximum Transmit Rate: This is the highest rate at which a client cant transmit data over Wi-Fi.
Spatial streams: Each radio can send independent data streams at the same time, each
containing dierent data, which can increase overall throughput. The number of these
independent data streams is dened as the number of spatial streams.
MCS index: The Modulation and Coding Scheme (MCS) index denes the maximum
transmission rate at which 802.11ac/n devices can communicate. 802.11ac uses Very High
Throughput (VHT) and 802.11n uses High Throughput (HT).
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