3com 3CRWX120695A WXR100 Manual De Usuario

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HAPTER

 5: P

LANNING

 

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OBILITY

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3WXM uses RF attenuation information in the floor plan when 
calculating how many MAPs you need and where to place them to 
provide the wireless coverage required for the floor. The RF attenuation 
information comes from the attenuation values associated with objects 
on the floor plan that have been converted into RF obstacles. An RF 
obstacle is an object that has an attenuation value associated with it.

You can add RF obstacles to a floor plan in the following ways:

„

Select the objects that will be RF obstacles and assign attenuation 
values to them. This method is available for floor plans that are 
imported from CAD drawings. (See “Converting Objects into RF 
Obstacles” on page 95.)

„

Use the graphics tools in 3WXM to draw the RF obstacles and assign 
attenuation values to them. This method is available for any floor plan. 
(See “Drawing RF Obstacles” on page 97.)

„

Import RF measurements from a site survey. This method requires the 
Ekahau Site Survey™ tool to create the site survey. You can use this 
method alone or in combination with the methods above. (See 
“Importing RF Obstacle Data from a Site Survey” on page 98.)

Consider the following when creating RF obstacles:

„

Be aware if a CAD drawing contains overlapping objects. If you create 
RF obstacles on objects that are on top of each other, the attenuation 
is increased at that point. (3WXM sums the attenuation factors in dB.)

„

Grouping objects is useful if you want one attenuation factor for an 
area on the floor.

 

(line)

1 Click at the start of the line.

2 Drag the cursor to the end of the line.

3 Click to finish.

 (cursor, under 

Select)

1 Click to exit free draw mode.