Specifications

Cisco Unified Wireless IP Phone 7921G Series Deployment Guide 38
Occurs when the reflected waves arrive in phase with the main signal and add on to the main signal thereby increasing the
signal strength.
Decreased Signal Amplitude
Occurs when the reflected waves arrive out of phase to some extent with the main signal thereby reducing the signal
amplitude.
Use of Orthogonal Frequency Division Multiplexing (OFDM), which is used by 802.11a and 802.11g, can help to reduce issues
seen in high multipath environments.
If using 802.11b in a high multipath environment, lower data rates should be used in those areas (i.e. 1 and 2 Mbps).
Use of antenna diversity can also help in such environments.
Verification with Site Survey Tools
These are many tools and applications that can be utilized to verify coverage, quality and configuration.
• Cisco Wireless Control System (WCS) for Unified Wireless LAN management
• Cisco Wireless LAN Solution Engine (WLSE) for Autonomous Wireless LAN management
• Cisco Spectrum Expert
• AirMagnet (Survey, WiFi Analyzer, VoFi Analyzer, Spectrum Analyzer)
• Cisco Unified Wireless IP Phone 7921G
Cisco 7921G Neighbor List
The Cisco Unified Wireless IP Phone 7921G can be utilized to verify coverage by using the Neighbor List menu.
By Default, the Cisco Unified Wireless IP Phone 7921G only scans when the current signal lowers to a certain threshold, so
only one access point may be visible in the list if configured for auto scan mode.