Note: Receiver sensitivity is the minimum signal needed to decode a packet at a certain data rate.
The above values are pure radio specifications and do not account for the gain of the single integrated antenna.
To achieve 802.11n/ac connectivity, it is recommended that the Cisco Wireless IP Phone 8821 and 8821-EX be within 100 feet
of the access point.
Regulatory
World Mode (802.11d) allows a client to be used in different regions, where the client can adapt to using the channels and
transmit powers advertised by the access point in the local environment.
The Cisco Wireless IP Phone 8821 and 8821-EX operate best when the access point is 802.11d enabled, where it can determine
which channels and transmit powers to use per the local region.
Enable World Mode (802.11d) for the corresponding country where the access point is located.
Some 5 GHz channels are also used by radar technology, which requires that the 802.11 client and access point be 802.11h
compliant if utilizing those radar frequencies (DFS channels). 802.11h requires 802.11d to be enabled.
The Cisco Wireless IP Phone 8821 and 8821-EX will passively scan DFS channels first before engaging in active scans of those
channels.
If 802.11d is not enabled, then the Cisco Wireless IP Phone 8821 and 8821-EX can attempt to connect to the access point using
reduced transmit power.
Below are the countries and their 802.11d codes that are supported by the Cisco Wireless IP Phone 8821 and 8821-EX.
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