ZyAIR G-3000 User’s Guide
59
Chapter 5 Wireless Configuration and Roaming
Figure 20
RTS/CTS
When station A sends data to the ZyAIR, 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.
5.2.2 Fragmentation Threshold
A
Fragmentation Threshold
is the maximum data fragment size (between 256 and 2432
bytes) that can be sent in the wireless network before the ZyAIR will fragment the packet into
smaller data frames.
Note:
Enabling the RTS Threshold causes redundant network
overhead that could negatively affect the throughput
performance instead of providing a remedy.
Summary of Contents for ZyAIR G-3000
Page 14: ...ZyAIR G 3000 User s Guide 15 Table of Contents...
Page 22: ...ZyAIR G 3000 User s Guide 23 List of Tables...
Page 26: ...ZyAIR G 3000 User s Guide 27 Preface...
Page 40: ...ZyAIR G 3000 User s Guide 41 Chapter 2 Introducing the Web Configurator...
Page 48: ...ZyAIR G 3000 User s Guide 49 Chapter 3 Wizard Setup...
Page 54: ...ZyAIR G 3000 User s Guide 55 Chapter 4 System Screens...
Page 100: ...ZyAIR G 3000 User s Guide 101 Chapter 8 IP Screen...
Page 116: ...ZyAIR G 3000 User s Guide 117 Chapter 10 Maintenance Figure 59 Restart Screen...
Page 122: ...ZyAIR G 3000 User s Guide 123 Chapter 11 Introducing the SMT...
Page 132: ...ZyAIR G 3000 User s Guide 133 Chapter 13 LAN Setup...
Page 174: ...ZyAIR G 3000 User s Guide 175 Appendix C Power over Ethernet Specifications...
Page 176: ...ZyAIR G 3000 User s Guide 177 Appendix D Brute Force Password Guessing Protection...
Page 188: ...ZyAIR G 3000 User s Guide 189 Appendix E Setting up Your Computer s IP Address...
Page 192: ...ZyAIR G 3000 User s Guide 193 Appendix F IP Address Assignment Conflicts...
Page 200: ...ZyAIR G 3000 User s Guide 201 Appendix G IP Subnetting...
Page 202: ...ZyAIR G 3000 User s Guide 203 Appendix H Command Interpreter...
Page 206: ...ZyAIR G 3000 User s Guide 207 Appendix I Log Descriptions...
Page 210: ...ZyAIR G 3000 User s Guide 211 Appendix J Wireless LAN and IEEE 802 11...
