3com Wireless LAN Controller WX2200 User Manual download pdf (Page 122)

122 CHAPTER 6: USING RF PLANNING

Prepare the Floor

Drawings

If your floor drawings are contained in JPEG or GIF files, this step does not

apply. Go directly to “Define Site Information” on page 123.

If you plan to import AutoCAD DXF™ or AutoCAD DWG files into

3WXM, you should perform some “clean up” work before importing the

files. Doing this work before you import the files into 3WXM creates a

more compact file, requiring less storage space. Typically, the more CAD

diagram cleanup that is done within the CAD software, the more

smoothly the drawing will import into 3WXM.

To clean up the AutoCAD file:

 Perform an audit

 Turn on, unlock, and unfreeze all layers

 Remove unnecessary notations

 Purge unused blocks, line types, and layers

Typically, based on the drawing technique chosen when the drawing file

was created in AutoCAD or TurboCAD, a single object may be drawn

with more than one line; for example, walls. When such an object is

imported, it results in more than one object in 3WXM. To avoid the actual

object being defined as more than one obstacle, delete parallel lines

within a certain distance.

Another method you can use to achieve the same result is to group all

the lines into one object. For example, you might group four lines that

form an office or conference room to create one attenuation factor for

that entire area. Or, group multiple lines that were drawn in the floor

plan to create a bigger line.

Grouping lines is not always recommended. For example, grouping lines

into one object does not work well with polylines. Grouped polylines are

recognized by the planning tool in 3WXM as a single, monolithic

obstacle. This causes incorrect results when viewing RF coverage.

Objects must not be RF Obstacles or Groups before Clean Layout is

performed.

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3com Wireless LAN Controller WX2200 User Manual Page 122