SMC Networks BARRICADETM N SMCWBR11S-3GN - Manual (Page 78)

C HAPTER 7 | Wireless Configuration
Advanced Settings
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will save all broadcast/multicast frames for the Basic Service Set (BSS)
and forward them after every beacon. Using smaller DTIM intervals
delivers broadcast/multicast frames in a more timely manner, causing
stations in Power Save mode to wake up more often and drain power
faster. Using higher DTIM values reduces the power used by stations in
Power Save mode, but delays the transmission of broadcast/multicast
frames. (Range: 1-255 beacons; Default: 1 beacon)
◆ Fragmentation Threshold – Configures the minimum packet size that
can be fragmented when passing through the access point.
Fragmentation of the PDUs (Package Data Unit) can increase the
reliability of transmissions because it increases the probability of a
successful transmission due to smaller frame size. If there is significant
interference present, or collisions due to high network utilization, try
setting the fragment size to send smaller fragments. This will speed up
the retransmission of smaller frames. However, it is more efficient to
set the fragment size larger if very little or no interference is present
because it requires overhead to send multiple frames. (Range: 256-
2346 bytes; Default: 2346 bytes)
◆ RTS Threshold — Sets the packet size threshold at which a Request to
Send (RTS) signal must be sent to a receiving station prior to the
sending station starting communications. The access point sends RTS
frames to a receiving station to negotiate the sending of a data frame.
After receiving an RTS frame, the station sends a CTS (clear to send)
frame to notify the sending station that it can start sending data.
If the RTS threshold is set to 0, the access point always sends RTS
signals. If set to 2347, the access point never sends RTS signals. If set
to any other value, and the packet size equals or exceeds the RTS
threshold, the RTS/CTS (Request to Send / Clear to Send) mechanism
will be enabled.
The access points contending for the medium may not be aware of each
other. The RTS/CTS mechanism can solve this “Hidden Node Problem.”
(Range: 1-2347 bytes: Default: 2347 bytes)
◆ Short Preamble — Sets the length of the signal preamble that is used
at the start of a data transmission. Use a short preamble (96
microseconds) to increase data throughput when it is supported by all
connected 802.11g clients. Use a long preamble (192 microseconds) to
ensure all 802.11b clients can connect to the network.
(Default: Disabled)
◆ Short Slot — Sets the basic unit of time the access point uses for
calculating waiting times before data is transmitted. A short slot time
(9 microseconds) can increase data throughput on the access point, but
requires that all clients can support a short slot time (that is, 802.11g-
compliant clients must support a short slot time). A long slot time
(20 microseconds) is required if the access point has to support
802.11b clients. (Default: Enabled)