Compute And Place Maps - 3Com Wireless LAN Controller WX2200 User Manual

144 C 6: U
HAPTER SING
Compute and Place
MAPs
RF P
LANNING
34 In the Wiring Closet list, select the wiring closet that contains the WX
switch or switches to be connected to the shared MAPs.
If the MAPs will be directly connected to WX switches, a wiring closet is
required. If all the MAPs in the coverage area will be indirectly connected
to WX switches through the network, a wiring closet is not required.
35 In the Redundant Wiring Closet list, select the wiring closet that will
provide redundant connection to the MAPs. This is required for directly
connected MAPs, if you require the MAPs to have redundant
connections. Otherwise, this is not required.
36 Click Finish to complete the wizard and create the coverage area. The
coverage area is now displayed on your floor.
When you perform the Compute and Place procedure for one or more
coverage areas, 3WXM automatically calculates the number of MAPs 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 130.
When you are performing Compute and Place for a coverage area for the
first time, the results do not account for existing MAPs. Manual overrides
of the MAP results are not taken into account if you perform Compute
and Place again.