Cisco 7920 - Unified Wireless IP Phone VoIP, Руководство администратора

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6-11
Cisco Wireless IP Phone 7920 Administration Guide for Cisco CallManager Release 4.0 and 4.1
OL-7104-01
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