MicroNet Technology SP906GK - Manual (Page 23)

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Preamble The preamble defines the length of the CRC block for
communication among wireless devices. This option is
only active in the Ad Hoc network.
There are three modes including Auto, Short and Long
Preamble. If “Auto“mode is selected, SP906GK will
automatically switch the preamble mode depending on
the wireless devices SP906GK is connected to.
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
2347 bytes. Minor change is recommended.
Fragment Threshold The value defines the maximum size of packets; any
packet size larger than the value will be fragmented. If
you decreased this value and experienced 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 2346 bytes. Minor change is
recommended.
Channel Plan This setting allows you to choose the certificate of
country or organization.