CiscoAironetAccessPointDeploymentGuide
CiscoSystems
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Figure 51: AP 3500i/e — 2x3:2 System (Two Transmitters, Three Receivers, Supporting Two Spatial
Streams)
Spatial streams, the actof transmitting informationout ofmore thanone antennaport concurrently,
requires that the AP have at least two or more transmitters and support elements of 802.11n (for
example,supportof
multiplespatialstreams).
With802.11a/b/g,datarateswereactualMbpsrateslike2,11,and54Mbpsandweredonewithone
transmitter. The AP 3500has two transmitters perband, soit supports802.11n data rates up to 300
Mbpsusingtwospatialstreams.
With802.11n,thedifferentrates
arecalledtheModulationandCodingScheme(MCS)indexvalue,and
thevaluedefines howmanystreamsareused.The AP3500supportedupto 300Mbps(MCSrate15)
configured with a bonded channel and short guard interval (GI). (See Figure 52.) The MCS values
correspondtoactualdata
rates.
Note:2x3:2meanstwotransmitters,threereceiverssupportingtwospatialstreams