Appendix D Wireless LANs
P-320W v3 User’s Guide
238
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.
Figure 150
RTS/CTS
When station A sends data to the AP, it might not know that the station B is
already using the channel. If these two stations send data at the same time,
collisions may occur when both sets of data arrive at the AP at the same time,
resulting in a loss of messages for both stations.
RTS/CTS
is designed to prevent collisions due to hidden nodes. An
RTS/CTS
defines the biggest size data frame you can send before an RTS (Request To
Send)/CTS (Clear to Send) handshake is invoked.
When a data frame exceeds the
RTS/CTS
value you set (between 0 to 2432
bytes), the station that wants to transmit this frame must first send an RTS
(Request To Send) message to the AP for permission to send it. The AP then
responds with a CTS (Clear to Send) message to all other stations within its range
to notify them to defer their transmission. It also reserves and confirms with the
requesting station the time frame for the requested transmission.
Stations can send frames smaller than the specified
RTS/CTS
directly to the AP
without the RTS (Request To Send)/CTS (Clear to Send) handshake.
You should only configure
RTS/CTS
if the possibility of hidden nodes exists on
your network and the "cost" of resending large frames is more than the extra
network overhead involved in the RTS (Request To Send)/CTS (Clear to Send)
handshake.
If the
RTS/CTS
value is greater than the
Fragmentation Threshold
value (see
next), then the RTS (Request To Send)/CTS (Clear to Send) handshake will never
occur as data frames will be fragmented before they reach
RTS/CTS
size.
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Страница 24: ...Chapter 1 Getting to Know Your P 320W v3 P 320W v3 User s Guide 24 ...
Страница 36: ...Chapter 2 Introducing the Web Configurator P 320W v3 User s Guide 36 ...
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Страница 72: ...Chapter 4 Wireless LAN P 320W v3 User s Guide 72 ...
Страница 76: ...Chapter 5 Wireless Client Mode P 320W v3 User s Guide 76 ...
Страница 88: ...Chapter 7 LAN P 320W v3 User s Guide 88 ...
Страница 104: ...Chapter 10 VLAN P 320W v3 User s Guide 104 ...
Страница 105: ...105 PART III Security Firewall 117 Content Filtering 125 ...
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Страница 116: ...Chapter 11 WAN P 320W v3 User s Guide 116 ...
Страница 124: ...Chapter 12 Firewall P 320W v3 User s Guide 124 ...
Страница 129: ...129 PART IV Management Static Route 131 Remote Management 135 Universal Plug and Play UPnP 141 ...
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Страница 140: ...Chapter 15 Remote Management P 320W v3 User s Guide 140 ...
Страница 154: ...Chapter 16 Universal Plug and Play UPnP P 320W v3 User s Guide 154 ...
Страница 155: ...155 PART V Maintenance and Troubleshooting System 157 Logs 163 Product Specifications 193 ...
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Страница 178: ...Chapter 18 Logs P 320W v3 User s Guide 178 ...
Страница 184: ...Chapter 19 Tools P 320W v3 User s Guide 184 ...
Страница 192: ...Chapter 20 Troubleshooting P 320W v3 User s Guide 192 ...
Страница 196: ...Chapter 21 Product Specifications P 320W v3 User s Guide 196 ...
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