Cisco Systems AIRRM3000ACAK9 manual

802.11n Primer - Understanding Spatial Streams

Figure 50 AP 3500i/e is a 2x3:2 system (supports up to 2 transmit chains)

Note 2x3:2 means two transmitters, three receivers supporting two spatial streams.

Figure 51 Modulation and Coding Scheme: 2SS Bonded Channel Supports up to 300 Mbps

Unlike the AP 3500, the newer AP 3600 supports 3SS with twice as many transmitters (4 per band) enabling faster data rates of up to 450 Mbps. Note that there is an extra radio for redundancy and enhanced performance (upstream and downstream) and the AP 3600 can also beamform to 3SS clients as well. The AP 2600 is similar but the extra or redundant radio is for upstream as it is a receive only so it is unable to beamform to 3-ss clients but can beamform at the other non-3ss rates.

Using a dual-band design the AP 3600 has a total of 8 transceivers (transmitter/receivers) using only 4 antennas (Figure 52). Four radios are used in each band, 2.4 GHz and 5 GHz.

Cisco Aironet Series 1600/2600/3600 Access Point Deployment Guide, Release 7.5

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