ZyXEL VFG6005 User Guide - Page 140

Channel, RTS/CTS

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Figure 172 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. 131

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Figure 172
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.