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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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