132 CHAPTER 4: P LANNING THE 3COM MOBILITY S YSTEMDrawing RF Obstacles To draw RF obstacles, you use the Insert RF Obstacle box of the EditContent page. Follow these steps.1 In the Insert RF Obstacle group box of the Edit Content page, click one ofthe following icons and draw the object as described:Using an object other than a line to represent an RF obstacle’s dimensionsdoes not materially affect the calculation of RF attenuation. When 3WXMcalculates attenuation along any vector passing through the obstacle, itcounts the obstacle’s RF attenuation only once, regardless of the floorspace it occupies.Object Action(circle)Diagonally drag the cursor over the area where you wantthe circle to appear.(square)Diagonally drag the cursor over the area where you wantthe square to appear.3WXM treats squares as one solid object when calculatingRF attenuation. To draw a square outline, draw four linesin a square shape, which are treated as four separate RFobstacles.(parallelogram)1 Click at a vertex, and drag the cursor to the nextconnected vertex.2 Click again, and drag the cursor until the parallelogramtakes the shape you want.3 Click to finish.(polygon)1 Click at a vertex, then move the cursor to the nextvertex.2 Repeat until the polygon takes the shape you want.For a polygon with n sides, click n-1 additional times atthe vertices. For example, to draw a 7-sided polygon,click at 6 vertices.3 At the last vertex before completing the shape,Right-click to complete the polygon.3WXM supports concave polygons. A concave polygoncontains an internal angle greater than 180 degrees.(line)1 Click at the start of the line.2 Drag the cursor to the end of the line.3 Click to finish.
