Cisco 7920 Administration Guide - Page 157

Chapter 6 Verifying the Wireless Network Configuration on the Cisco Wireless IP Phone Performing a Site Survey Verification Note For more detailed information about the wireless voice requirements, refer to the Cisco Wireless IP Phone 7920 Design and Deployment Guide • 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. Related Topics • 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 OL-7104-01 Cisco Wireless IP Phone 7920 Administration Guide for Cisco CallManager Release 4.0 and 4.1 6-11