Wireless Array
Installing the Wireless Array
45
data rate achievable at each level, with many additional lower rates occurring at
each level dependent on signal level, signal to noise ratio in the environment, etc.
Phase 1 802.11ac, first available in consumer products in 2012 and enterprise
products in 2013, supports up to 80MHz channels and up to 3 spatial streams for a
maximum data rate of 1.3Gbps.
Phase 2 and beyond products, expected starting in 2014, will add 160MHz
channels and up to 8 spatial streams for a maximum data rate of 6.9Gbps.
ACExpress™
Xirrus 802.11ac IAPs use ACExpress™ to optimize wireless performance by
automatically separating faster 802.11ac clients from slower Wi-Fi clients. Since
Wi-Fi is a shared medium, this separation ensures that slower 802.11a/b/g/n
clients do not starve the performance of 802.11ac clients. For example, the data
rate of an 802.11n client is less than 25% of the rate of an 802.11ac client, and thus
will take four times as much air time for a given amount of data. This takes
available bandwidth away from faster clients, reducing their performance
significantly. ACExpress intelligently separates clients by type onto different
radios, grouping fast clients separately from slow clients, thereby maximizing
performance for all. ACExpress is supported on all Xirrus 802.11ac products, both
APs and Arrays. ACExpress may be enabled or disabled as part of the Load
Balancing feature. See
Step 26 on page 307
.
802.11ac Deployment Considerations
The theoretical data rates shown are just that, theoretical. For 802.11ac
deployments, numerous factors affect real-world performance. These are some
important considerations in the deployment of networks that include 802.11ac:
Wireless networks are not wired networks.
Wired network users who
share a Gigabit network can expect to see bursts of up to 900Mbps,
depending on their hardware. Maximum Wi-Fi data rates are reduced by
signaling overhead and media contention. Most 802.11ac users will see
data rates less than 100Mbps as the effective bandwidth is shared among
all devices connecting to a given radio.
Summary of Contents for XR-520
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