- Cisco Network Router User's Manual

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CiscoAironetAccessPointDeploymentGuide 
CiscoSystems
Copyright©2012CiscoSystems,Inc.Allrightsreserved.
Page39of52
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Figure 51: AP 3500i/e — 2x3:2 System (Two Transmitters, Three Receivers, Supporting Two Spatial
Streams)
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Spatial streams, the act of transmitting information out of more than one antenna port concurrently,
requires that the AP have at least two or more transmitters and support elements of 802.11n (for
example,supportof
multiplespatialstreams).
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With802.11a/b/g,datarateswereactualMbpsrateslike2,11, and54Mbpsandweredonewithone
transmitter. The AP 3500 has two transmitters per band, so it supports 802.11n data rates up to 300
Mbpsusingtwospatialstreams.
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With802.11n,thedifferentrates
arecalledtheModulationandCodingScheme(MCS)indexvalue,and
the value defines how many streams are used. The AP 3500 supported up to 300 Mbps (MCS rate 15)
configured with a bonded channel and short guard interval (GI). (See Figure 52.) The MCS values
correspondtoactualdata
rates.
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Note:2x3:2meanstwotransmitters,threereceiverssupportingtwospatialstreams
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