Description
2.1 Network structures
SCALANCE W786-xPRO
16
Operating Instructions, Release 08/2007, C79000-G8976-C221-02
Multichannel configuration
If neighboring SCALANCE W78x access points use the same frequency channel, the
response times are longer due to the collisions that occur. If the configuration shown in the
figure is implemented as a single-channel system, computers A and B cannot communicate
at the same time with the SCALANCE W78x access points in their cells.
If neighboring SCALANCE W78x access points are set up for different frequencies, this
leads to a considerable improvement in performance. As a result, neighboring cells each
have their own medium available 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 W78x access points can be
configured with the same network name.
1
1
2
2
A
B
Figure 2-4
Multichannel configuration on channels 1 and 7 with four SCALANCE W78x access
points
