ZyXEL 91-005-124003B Datasheet download pdf (Page 160)

G-1000 User’s Guide

160 Wireless LANs

Figure 104 Infrastructure WLAN

Channel

A channel is the radio frequency(ies) used by IEEE 802.11a/b/g wireless devices. Channels

available depend on your geographical area. You may have a choice of channels (for your

region) so you should use a different channel than an adjacent AP (access point) to reduce

interference. Interference occurs when radio signals from different access points overlap

causing interference and degrading performance.

Adjacent channels partially overlap however. To avoid interference due to overlap, your AP

should be on a channel at least five channels away from a channel that an adjacent AP is using.

For example, if your region has 11 channels and an adjacent AP is using channel 1, then you

need to select a channel between 6 or 11.

RTS/CTS

A hidden node occurs when two stations are within range of the same access point, but are not

within range of each other. The following figure illustrates a hidden node. Both stations (STA)

are within range of the access point (AP) or wireless gateway, but out-of-range of each other,

so they cannot "hear" each other, that is they do not know if the channel is currently being

used. Therefore, they are considered hidden from each other.

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ZyXEL 91-005-124003B Datasheet Page 160