Edimax Technology EW-7326Ig - Manual (Page 22)

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Parameter Description
802.11b Preamble Mode The preamble defines the length of the CRC block for
communication among the wireless stations. There are three
mode including Long, Short and Auto. High network traffic areas
should use the shorter preamble type. If “Auto“ mode is selected,
the card will auto switch the preamble mode depending on the
wireless stations that the card is connecting to.
Note that the parameter is only active in the Ad Hoc operation
mode.
Fragment Threshold The value defines the maximum size of packets; any packet size
larger than the value will be fragmented. If you have decreased
this value and experience high packet error rates, you can
increase it again, but it will likely decrease overall network
performance. Select a setting within a range of 256 to 2432 bytes.
Minor change is recommended.
RTS Threshold Minimum packet size required for an RTS (Request To Send). For
packets smaller than this threshold, an RTS is not sent and the
packet is transmitted directly to the wireless network. Select a
setting within a range of 0 to 2432 bytes. Minor change is
recommended.
Set Defaults Let the setting values return to default.
Apply Confirm the settings in the “Advanced“.