Cisco Aironet Access Point Deployment Guide
Common or Distributed Antenna System (DAS)
Due to the dual‐band nature of the antenna system on the AP 2600 and the AP 3600, along with key features such as ClientLink 2.0 beamforming, the AP 2600 and the AP 3600 are not recommended for deployments on Distributed Antenna Systems (DAS).
Note: Cisco does not certify, endorse or provide RF support for Wi‐Fi deployments over any DAS.
The DAS vendor and systems integrator are solely responsible for the support of the DAS products, adequate RF coverage, and any RF‐related issues. This support includes, but is not exclusive to, location accuracy, RF coverage, roaming issues related to RF, multipath issues, and scalability.
The DAS vendor and systems integrator are also responsible for understanding that the deployed DAS system meets the requirements of all of the customer Wi‐Fi devices and applications over the DAS system; this statement includes, but is not exclusive to, all Voice over WLAN (VoWLAN) and medical devices.
While Cisco Technical Assistance Center (TAC) and Cisco field teams do not provide support for RF issues that arise in a Cisco WLAN used over a DAS, they do provide support for non‐RF related issues in Cisco products according to the customer support agreement with Cisco Systems.
For more information, see the following URL:
http://www.cisco.com/en/US/prod/collateral/wireless/ps5678/ps6973/positioning_statement_c07‐ 565470_ps10092_Products_Data_Sheet.html
Elevators
Elevator coverage can sometimes be accomplished by placing APs in the near field of the elevator, typically on each floor near the elevator door. Since elevators often have metal doors, and the shafts are often concrete or contain other materials that degrade Wi‐Fi coverage, it is important to check the coverage inside the elevator. Elevator coverage can be a challenge, but it is often possible, especially if the elevator only serves a few floors.
In high rise elevators, roaming issues are more problematic because the client cycles through a large number of APs rather quickly. Some companies put a patch antenna on the floor inside the shaft and a patch antenna on the bottom of the elevator car, while other companies use leaky coaxial cable along the side of the shaft.
When installing any Wi‐Fi equipment inside elevator cars or shafts, follow local regulations. Some installations may be prohibited because of safety reasons, while other installations may be prohibited by the building owner or local fire department. Only elevator repair persons or experienced contractors should perform this type of work.
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