Specifications

Cisco Unified Wireless IP Phone 7921G Series Deployment Guide 32
2.4 GHz (802.11b/g)
In the 2.4 GHz (802.11b/g environment, only non-overlapping channels must be utilized when deploying VoWLAN. Non-
overlapping channels have 22 MHz of separation and are at least 5 channels apart.
There are only 3 non-overlapping channels in the 2.4 GHz frequency range (channels 1, 6, 11). In Japan, channel 14 can be
utilized as a fourth non-overlapping channel when using 802.11b access points.
Non-overlapping channels must be used and allow at least 20 percent overlap with adjacent channels when deploying phones in
the 802.11b/g environment.
Ch 1
Ch 6
Ch 11
Ch 6
Ch 6
Ch 11
Ch 1
Ch 11
Minimum 20% Overlap