Signal Strength And Coverage - Cisco 7925G Deployment Manual

You must use non-overlapping channels and allow at least 20 percent overlap with adjacent channels when deploying phones in
the 802.11b/g environment.

Signal Strength and Coverage

To ensure acceptable voice quality, the Cisco Unified Wireless IP Phone 7925G should always have a signal of -67 dBm or
higher when using 2.4 or 5 GHz and ensure the Packet Error Rate (PER) is no higher than 1%.
A minimum Signal to Noise Ratio (SNR) of 25dB = -92dBm noise level with -67 dBm signal should be maintained.
It is recommended to have at least two access points on non-overlapping channels with at least -67 dBm signal with the 25 dB
SNR to provide redundancy.
To achieve maximum capacity and throughput, the wireless LAN should be designed to 24 Mbps. Higher data rates (36-54
Mbps) can optionally be enabled.
Recommended to set the minimum data rate to 11 Mbps or 12 Mbps for 2.4 GHz (dependent upon 802.11b client support
policy) and 12 Mbps for 5 GHz, which should also be the only rate configured as a basic rate.
For more information about signal strength and cell edge design, refer to the "VoWLAN Design Recommendations" chapter in
the Enterprise Mobility Design Guide at this URL:
http://www.cisco.com/application/pdf/en/us/guest/netsol/ns279/c649/ccmigration_09186a00808d9330.pdf
Cisco Unified Wireless IP Phone 7925G Deployment Guide
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Minimum 20% Overlap
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