134CHAPTER 6: USING RF PLANNING

Compute and When you perform Compute and Place for one or more coverage areas, Place MAPs 3WXM automatically calculates the number of MAP access points you

require and places them in appropriate locations on the floor. To do this, two calculations are performed in 3WXM: One is based on capacity (traffic engineering) and the other is based on pure RF coverage (at a given data rate).

After the calculations are performed, the number of MAPs from capacity and the number of MAPs from coverage are compared, and the bigger count “wins.” If capacity wins, a grid pattern of MAPs is established. The MAP coverage positions are reused, with the excess MAPs remaining in their original grid position.

Using a “clean” RF model is imperative for best results. If you have many parallel RF obstacles that are close together, the placement algorithm tends to add more MAPs than are required. So, even with the automatic clean layout mechanism in 3WXM, complex drawings demand additional pruning and isolation of single RF obstacles objects to keep the RF obstacle count as low as possible. For more information about cleaning your floor plans, see “Clean Layout” on page 122.

When you are performing Compute and Place for a coverage area for the first time, the results do not account for existing MAP access points. Manual overrides of the MAP results are not taken into account if you perform Compute and Place again.

To determine the number and placement of MAPs:

1The Organizer panel is displayed on the left. Expand Sites, right-click on a building, and select Edit.

The Modify Building wizard is displayed.

2Select the Plan RF Coverage tab; then click Compute and Place MAPs.

3If required, under Wiring Closet, use the down arrow to select the wiring closet associated with the area. Click Next.

The Coverage Area Progress is displayed. Information is shown about the number of MAPs per coverage area, and whether they were placed based on coverage or capacity.

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3Com CRWXR10095A, 3CRWX440095A, 3CRWX120695A manual Using RF Planning