Affirmative 7370 Guia Do Utilizador
Survey
The Survey tab can assist you in conducting a site survey. Survey operates at the RF level and is used to
determine the best placement and coverage (overlap) for your network's infrastructure devices. During
a site survey, the current status of the network is read from the client adapter and displayed four times
per second so you can accurately gauge network performance. The feedback that you receive can help
you to eliminate areas of low RF signal levels that can result in a loss of connection between the client
adapter and its associated access point (or other infrastructure device).
Survey can be operated in two modes:
• Passive. This is the default site survey mode. It does not initiate any RF network traffic; it simply
determine the best placement and coverage (overlap) for your network's infrastructure devices. During
a site survey, the current status of the network is read from the client adapter and displayed four times
per second so you can accurately gauge network performance. The feedback that you receive can help
you to eliminate areas of low RF signal levels that can result in a loss of connection between the client
adapter and its associated access point (or other infrastructure device).
Survey can be operated in two modes:
• Passive. This is the default site survey mode. It does not initiate any RF network traffic; it simply
listens to the traffic that the client adapter hears and displays the results. Follow the instructions in
the
the
to activate the passive mode.
• Active. This mode causes the client adapter to actively send or receive low-level RF packets to or
from its associated access point and provides information on the success rate. It also enables you to
set parameters governing how the site survey is performed (such as the data rate). Follow the
instructions in the
set parameters governing how the site survey is performed (such as the data rate). Follow the
instructions in the
to activate the active mode.
Guidelines
Keep the following guidelines in mind when preparing to perform a site survey:
• Use the active mode when performing a site survey.
• Use the active mode when performing a site survey.
• Perform the site survey when the RF link is functioning with all other systems and noise sources
operational.
• Execute the site survey entirely from the YEStablet.
• Conduct the site survey with all variables set to operational values.
• Consider the following operating and environmental conditions when performing a site survey:
o Data rates - Sensitivity and range are inversely proportional to data bit rates. Therefore, the
maximum radio range is achieved at the lowest workable data rate, and a decrease in
receiver threshold sensitivity occurs as the radio data increases.
receiver threshold sensitivity occurs as the radio data increases.
o Antenna type and placement - Proper antenna configuration is a critical factor in
maximizing radio range. As a general rule, range increases in proportion to antenna height.
o Physical environment - Clear or open areas provide better radio range than closed or filled
areas. Also, the less cluttered the work environment, the greater the range.
o Obstructions - A physical obstruction such as metal shelving or a steel pillar can hinder the
performance of wireless devices. Avoid placing these devices in a location where a metal
barrier is between the sending and receiving antennas.
barrier is between the sending and receiving antennas.
o Building materials - Radio penetration is greatly influenced by the building material used
in construction. For example, drywall construction allows greater range than concrete
blocks, and metal or steel construction is a barrier to radio signals.
blocks, and metal or steel construction is a barrier to radio signals.
Using Passive Mode
This is the default site survey mode when you click on the Survey tab. It does not initiate any RF
network traffic; it simply listens to the traffic that the client adapter hears and displays the results. As
you move the YEStablet to various locations in your site, you will see the effect on the metrics
described in Table 5 change.
network traffic; it simply listens to the traffic that the client adapter hears and displays the results. As
you move the YEStablet to various locations in your site, you will see the effect on the metrics
described in Table 5 change.
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