ZyXEL Communications VMG8924-B30A Series Guia do Utilizador descarregar pdf (Página 377)

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Appendix E Wireless LANs

VMG8924-B10A and VMG8924-B30A Series User’s Guide

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An ESSID (ESS IDentification) uniquely identifies each ESS. All access points and their associated

wireless clients within the same ESS must have the same ESSID in order to communicate.

Figure 241 Infrastructure WLAN

Channel

A channel is the radio frequency(ies) used by wireless devices to transmit and receive data.

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

region) so you should use a channel different from 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

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