Cisco 7920 - Unified Wireless IP Phone VoIP Administration Manual page 157

Chapter 6 Verifying the Wireless Network Configuration on the Cisco Wireless IP Phone
For more detailed information about the wireless voice requirements, refer to the
Note
Cisco Wireless IP Phone 7920 Design and Deployment Guide
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Related Topics
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Cisco Wireless IP Phone 7920 Administration Guide for Cisco CallManager Release 4.0 and 4.1
OL-7104-01
Minimum of two access points on non-overlapping channels appear in the
7920 Site Survey utility at all times.
No more than one AP per overlapping channel with a radio signal strength
indicator (RSSI) less than 35.
Two of the APs, including the connected (C) AP must have an RSSI of greater
than 35. Two APs insure that phones can roam easily and that a backup AP is
available when one AP is busy or unavailable.
The available link speed must be at 11 Mbps at all times.
AP coverage should overlap by 20 percent.
The packet error rate (PER) should be no higher than one percent.
The minimum signal to noise ratio (SNR) should be 25 db.
The transmit power should be the same for both the AP and phones.
All APs must have diversity antennas and must use the diversity setting.
In a high traffic area such as a conference room, use additional APs to balance
the load.
Site Survey Verification, page 6-8
Understanding the Wireless LAN, page 2-1
Interacting with the Cisco Aironet Access Point, page 2-8
Voice Quality in a Wireless Network, page 2-12
Performing a Site Survey Verification
6-11