Cisco Cisco 5508 Wireless Controller 기술 참조

In order to beamform to clients using three spatial streams, since three transmitters are used in the 
transmissions, the AP needs at least one additional radio to beamform. The AP 3600 has four radios per 
band and can beamform to clients using three spatial streams.

To summarize, ClientLink 2.0 takes the received signals heard from the client on the uplink and 
calculates how the multipath signal looked from those streams. Then, on the reciprocal side (transmit 
downlink), ClientLink 2.0 uses all four radios to figure out the optimal way to form the signal (transmit 
beamforming) to enable the client to best decode (receive the signal on the downlink) with the least 
amount of retries.

ClientLink 2.0 with an AP 3600 enables beamforming to all 802.11n clients, including 3SS clients, and 
can do so for up to 128 clients at a time. The AP 1600 supports fewer clients (32) and does not support 
3SS. ClientLink 1.0 supported a maximum of 15 clients at a time. ClientLink 2.0 significantly improves 
throughput and coverage up to 60% on the downlink side for much better 802.11n client connectivity 
and for enhancing the Bring Your Own Device (BYOD) experience.

For more information on Cisco ClientLink 2.0, refer to the following URL:

While ClientLink dynamically beamforms and helps to maintain a robust signal, which results in fewer 
retries, it was not designed to change the cell range. ClientLink creates a better connection experience, 
not a larger cell size.

For this reason, during a site survey, it is important to keep in mind that the AP 3600 cell sizes are 
generally the same or very similar to other Cisco access points. 

 depicts typical ranges in the 

1-54 Mbps range. While Cisco always recommends that you survey with the equipment you intend to 
deploy, an earlier survey done with an AP 3500, for example, would not be invalid for an AP 3600 
deployment. 

 and 

 provide examples of the modulation types and signal-to-noise ratio 

(SNR).