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Vantage CNM 2.0
Figure 6-1 RTS Threshold
Wireless stations (WS) A and B do not hear each other. They can hear the AP. When station A sends data to the
ZyXEL device, 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.
Enabling the RTS Threshold causes redundant network overhead that could
negatively affect the throughput performance instead of providing a remedy.
6.2.4 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 ZyXEL device will fragment the packet into smaller data frames.
A large Fragmentation Threshold is recommended for networks not prone to interference while you should set
a smaller threshold for busy networks or networks that are prone to interference.
If the Fragmentation Threshold value is smaller than the RTS/CTS value (see previously) you set then the
RTS (Request To Send)/CTS (Clear to Send) handshake will never occur as data frames will be fragmented
before they reach RTS Threshold size.
6-2
Configuration > WLAN
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