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4
Table 4-7 Wi-Fi Advanced Menu
4-8
Field or Button
Beacon Interval
RTS Threshold
Preamble Type
Fragmentation
Threshold
DTIM Interval
CTS Protection Mode
Description
Enter a value between 1 and 65,535 milliseconds. The
Beacon Interval value indicates the frequency interval of the
beacon. A beacon is a packet broadcast by the device to
synchronize the other wireless network.
This value should remain at its default setting of 2347. The
range is 0-2347 bytes. Should you encounter inconsistent
data flow, only minor modifications are recommended. If a
network packet is smaller than the preset RTS threshold
size, the RTS/CTS mechanism will not be enabled. The
device sends Request to Send (RTS) frames to a particular
receiving wireless client on the network and negotiates the
sending of a data frame. After receiving an RTS, the
wireless client responds with a Clear to Send (CTS) frame to
acknowledge the right to begin transmission.
The Preamble defines the length of the CRC block (Cyclic
Redundancy Check is a common technique for detecting
data transmission errors) for communication between the
wireless router and the roaming wireless network adapters.
Note: High network traffic areas should use the shorter
preamble type.
The range is 256-2346 bytes. It specifies the maximum size
for a packet before data is fragmented into multiple
packets. If you experience a high packet error rate, you may
slightly increase the Fragmentation Threshold. Setting the
Fragmentation Threshold too low may result in poor
network performance. Only minor modifications of this
value are recommended.
The default value is 3. This value, between 1 and 255
milliseconds, indicates the interval of the Delivery Traffic
Indication Message (DTIM). A DTIM field is a countdown
field informing clients of the next window for listening to
broadcast and multicast messages. When the router has
buffered broadcast or multicast messages for associated
clients, it
sends the next DTIM with a DTIM Interval value. Its clients
hear the beacons and awaken to receive the broadcast and
multicast messages.
CTS (Clear To Send) is a function used to minimize
collisions among wireless devices on a wireless LAN. CTS
will make sure the wireless network is clear before a
wireless client attempts to send wireless data. Enabling CTS
will add overhead and may lower wireless through put.
None: CTS is typically used in a pure 802.11g environment.
If CTS is set to "Disable" in a mixed mode environment
populated by 802.11b clients, wireless collisions may occur
frequently. If set to Enable, CTS will always be used to
make sure the wireless LAN is clear before sending data. If
set to Auto, CTS will monitor the wireless network and
automatically decide whether to implement CTS based on
the amount of traffic and collisions that occurs on the
wireless LAN.
Advanced Configuration
JAN 2011
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