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245U-E Wireless Ethernet Modem User Manual
45
Rev Version 2.24
TX Antenna (Note: Not
used on 245U-E-A1 or
245U-E-G1)
Select the antenna port that the module will use for transmissions:
Main Port Only—Messages are transmitted from the main TX/RX port. The
auxiliary port RX is disabled.
Both (Diversity)—Both ports will be used to transmit, but not at the same time.
The module calculates the best port based on previous transmissions and MAC
addressing.
NOTE Broadcast / UDP transmission messages will initially toggle
between the antenna ports, and could result in every second message
not being heard until the module learns which device can be reached
through which antenna port.
Aux Port Only—Messages will be transmitted via the auxiliary RX port only.
RX Antenna (Note: Not
used on 245U-E-A1)
Same as for TX antenna above, but for the receiver port. Setting to
“Both (Diversity)” will allow a high gain antenna to be connected to the
auxiliary RX port, which will give better RX signal gain without increasing the TX
gain and possibly pushing it over the regulatory EIRP threshold.
DTIM Period)
(Access point only.) DTIM sets which beacon frames incorporate extra
information for low power sleeping client devices. Normally set this to 1.
RTS Threshold
Ready To Send threshold. RTS frames can be used to help avoid radio collisions
between two stations that cannot directly hear each other. Any frame larger
than the RTS threshold bytes will be preceded by an RTS message. The default
value of RTS threshold is 2346, which effectively disables RTS signaling, since
this value is larger than the maximum frame size (fragmentation threshold).
Fragmentation
Threshold
(Client stations only.) The maximum transmission unit (MTU) of data over the
radio. If more than this number of bytes is input into the module, it will be
transmitted in more than one message (fragmented).
Interference Mitigation
(Access point only.) Interference Mitigation should only be turn on (default
is off) if using demo whip antennas or if there is a high level of background
interference.
By enabling this option, the radio will dynamically adjust the radio parameters
to help mitigate interference based on any background interference. It will
reduce the receiver sensitivity and therefore should only be enabled on paths
with a high fade margin and good signal quality.