Verification With Site Survey Tools - Cisco 9971 Deployment Manual

Multipath can exist in environments where there are reflective surfaces (i.e. metal, glass, etc.). Avoid mounting access points
on these surfaces.
Below is a list of multipath effects:
Data Corruption
Occurs when multipath is so severe that the receiver is unable to detect the transmitted information.
Signal Nulling
Occurs when the reflected waves arrive exactly out of phase with the main signal and cancel the main signal completely.
Increased Signal Amplitude
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
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
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Cisco Wireless LAN Solution Engine (WLSE) for Autonomous Wireless LAN management
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Cisco Spectrum Expert
•
AirMagnet (Survey, WiFi Analyzer, VoFi Analyzer, Spectrum Analyzer)
•
Cisco Unified IP Phone 9971 Wireless LAN Deployment Guide
(OFDM), which is used by 802.11a and 802.11g, can help to reduce issues
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