ZyXEL Communications NBG-510S Guia do Utilizador descarregar pdf (Página 183)

Appendix C Wireless LANs

NBG-510S User’s Guide

183

Figure 126 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 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.

1 2 ... 178 179 180 181 182 183 184 185 186 187 188 ... 209 210

Sem comentários

ZyXEL Communications NBG-510S Guia do Utilizador Página 183