3Com 3CRWX120695A WXR100, 3CRWXR10095A manual Planning the 3COM Mobility System

94CHAPTER 5: PLANNING THE 3COM MOBILITY SYSTEM

1 Click at the start of the line.

2 Drag the cursor to the end of the line.

(line)3 Click to finish.

1 Click to exit free draw mode.

(cursor, under

Select)

Specifying the RF 3WXM uses RF attenuation information in the floor plan when Characteristics of a calculating how many MAPs you need and where to place them to

Floorprovide 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.)

You also can use site survey data to optimize a network plan after you install 3Com equipment. (See “Optimizing a Network Plan” on page 475.)

Recommendations 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.