User's Manual

Basic Information on Wireless LAN Communication
Multichannel Configuration
If neighboring SCALANCE W 788 access points use the same frequency channel,
the response times are longer due to the collisions that occur. If the configuration
shown in Figure 1-4 is implemented as a single-channel system, computers A and
B cannot communicate at the same time with the SCALANCE W 788-1pro access
points in their cells.
If neighboring SCALANCE W 788 access points are set up for different frequen-
cies, this leads to a considerable improvement in performance. As a result, neigh-
boring cells each have their own medium and the delays resulting from time-offset
transmission no longer occur.
Channel spacing should be as large as possible; a practical value would be 25
MHz (five channels). Even in a multichannel configuration, all SCALANCE W 788
access points can be configured with the same network name.
1
1
7
7
A
B
Figure 1-4 Multichannel Configuration on Channels 1 and 7 with four
SCALANCE W 788 Access Points
Operating Instructions SCALANCE W 788-1pro / SCALANCE W 788-2pro
C79000-G8976-C184-01
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