User's Guide

Chapter 10 Wireless
NWA/WAC/WAX Series User’s Guide
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Figure 72 An Example Four-Channel Deployment
However, some regions require the use of other channels and often use a safety scheme with the
following four channels: 1, 4, 7 and 11. While they are situated sufficiently close to both each other and
the three so-called “safe” channels (1,6 and 11) that interference becomes inevitable, the severity of it is
dependent upon other factors: proximity to the affected AP, signal strength, activity, and so on.
Finally, there is an alternative four channel scheme for ETSI, consisting of channels 1, 5, 9, 13. This offers
significantly less overlap that the other one.
Figure 73 An Alternative Four-Channel Deployment
Load Balancing
Because there is a hard upper limit on an AP’s wireless bandwidth, load balancing can be crucial in
areas crowded with wireless users. Rather than let every user connect and subsequently dilute the
available bandwidth to the point where each connecting device receives a meager trickle, the load
balanced AP instead limits the incoming connections as a means to maintain bandwidth integrity.
There are three kinds of wireless load balancing available on the Zyxel Device:
Load balancing by station number limits the number of devices allowed to connect to your AP. If you
know exactly how many stations you want to let connect, choose this option.
For example, if your company’s graphic design team has their own AP and they have 10 computers,
you can load balance for 10. Later, if someone from the sales department visits the graphic design
team’s offices for a meeting and he tries to access the network, his computer’s connection is delayed,
giving it the opportunity to connect to a different, neighboring AP. If he still connects to the AP
regardless of the delay, then the AP may boot other people who are already connected in order to
associate with the new connection.
Load balancing by smart classroom also limits the number of devices allowed to connect to your AP.
But any new connections will be just rejected when the AP is overloaded.