Wireless Lan Design; 802.11 Network; Ghz (802.11A/N/Ac) - Cisco 8861 Deployment Manual

Wireless LAN Design

The following network design guidelines must be followed in order to accommodate for adequate coverage, call capacity and
seamless roaming for the Cisco IP Phone 8861 and 8865.

802.11 Network

Use the following guidelines to assist with deploying and configuring the wireless LAN.

5 GHz (802.11a/n/ac)

5 GHz is the recommended frequency band to utilize for operation of the Cisco IP Phone 8861 and 8865.
In general, it is recommended for access points to utilize automatic channel selection instead of manually assigning channels to
access points.
If there is an intermittent interferer, then the access point or access points serving that area may need to have a channel statically
assigned.
The Cisco IP Phone 8861 and 8865 support Dynamic Frequency Selection (DFS) and Transmit Power Control (TPC) from
802.11h, which are required when using channels operating at 5.260 - 5.720 GHz, which are 15 of the 24 possible channels.
Need to ensure there is at least 20 percent overlap with adjacent channels when deploying the Cisco IP Phone 8861 and 8865 in
an 802.11a/n/ac environment, which allows for seamless roaming. For critical areas, it is recommended to increase the overlap
(30% or more) to ensure that there can be at least 2 access points available with -67 dBm or better, while the Cisco IP Phone
8861 and 8865 also meet the access point's receiver sensitivity (required signal level for the current data rate).
Dynamic Frequency Selection (DFS)
DFS dynamically instructs a transmitter to switch to another channel whenever radar signal is detected. If the access point
detects radar, the radio on the access point goes on hold for at least 60 seconds while the access point passively scans for
another usable channel.
Cisco IP Phone 8861 and 8865 Wireless LAN Deployment Guide
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