Cisco Systems - page 39

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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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