Cisco Systems 7920 用户手册
1-8
Site Survey Guide for Deploying Cisco 7920 IP Phones
OL-6315-01
Chapter 1 Overview
Recommendations for Successful VoIP Surveys
Comparison of a Manual Survey and an Automated Survey
shows an actual hospital survey done using AirMagnet Surveyor with an 802.11b Cisco
PCM350 client card. Four panels on the AirMagnet window show the survey results. The top-left panel
shows that the survey data was collected in passive mode. The middle left panel shows the access points
seen by the survey client while doing the passive mode walkabout to collect survey data. The right panel
shows the floor plan that was imported and the strength of signal as reported by the client walkabout for
the survey area. The dark green to light blue colors indicate that the signal strength on the floor of the
hospital wing varied from -30 dBm to -55 dBm. The five access points that are located on the floor are
tagged with their MAC addresses. The room walls on this floor had 6 dB of attenuation and the doors
had 7 dB of attenuation. The through-floor attenuation was 7 dB.
shows that the survey data was collected in passive mode. The middle left panel shows the access points
seen by the survey client while doing the passive mode walkabout to collect survey data. The right panel
shows the floor plan that was imported and the strength of signal as reported by the client walkabout for
the survey area. The dark green to light blue colors indicate that the signal strength on the floor of the
hospital wing varied from -30 dBm to -55 dBm. The five access points that are located on the floor are
tagged with their MAC addresses. The room walls on this floor had 6 dB of attenuation and the doors
had 7 dB of attenuation. The through-floor attenuation was 7 dB.
Figure 1-6
Hospital Floor Survey with AirMagnet Surveyor
shows the manual survey results of a group of survey engineers. The AirMagnet Surveyor
report shows a remarkable similarity to the manual survey. The survey in
shows that
throughout the floor the signal is above -65 dBm. The manual survey was done with a cell edge
requirement of -65 dBm. The manual survey was completed several weeks before the AirMagnet
Surveyor survey. The floor plans used for AirMagnet Surveyor were imported from the drawings
provided by the contracted survey team. By necessity, the survey team spent a great deal of time
determining the proper location, power settings, and antenna types to be used on the floor. However, the
AirMagnet Surveyor provided an updated survey in a couple of minutes from a walkabout that took less
than 20 minutes.
requirement of -65 dBm. The manual survey was completed several weeks before the AirMagnet
Surveyor survey. The floor plans used for AirMagnet Surveyor were imported from the drawings
provided by the contracted survey team. By necessity, the survey team spent a great deal of time
determining the proper location, power settings, and antenna types to be used on the floor. However, the
AirMagnet Surveyor provided an updated survey in a couple of minutes from a walkabout that took less
than 20 minutes.