3com CRWXR10095A Manuale Utente

When planning a 3Com network, you need to consider how the building 
layout and physical objects affect signal loss. Walls, windows, and doors 
absorb RF signals, and different building materials have different 
attenuation factors. 

You can model an RF obstacle on your floor plan and assign the obstacle 
type and attenuation factor, or you can assign an obstacle type and 
attenuation factor to objects in a DWG or DXF drawing. 3WXM uses 
these values when calculating coverage for the network.

If you do not have an imported drawing, or if you are working with a GIF 
or JPEG image, you must create RF obstacles manually. If you are using an 
imported CAD drawing, you can convert many of the objects in the 
drawing into RF obstacles. All objects similar in construction material 
should be placed in one layer. For example, if the drawing file has walls 
spread out in different layers, but after performing a site-survey, they 
walls were found to be similar in material construction, it is better to put 
them in one layer. In this way, the RF attenuation assignment can be 
performed in one step.

This section show how to select and draw objects and convert them into 
RF obstacles. 3WXM preserves the layers defined in a CAD drawing.

Table 13 provides some common AutoCAD layer terminology.

Table 13   Common AutoCAD Layer Terminology

glaz windows

scol

steel columns

p-fixt

bathroom 

p-part

bathroom stall partitions 

ext

int

exterior 

interior