3Com 3CRWX275075A - Wireless LAN Managed Access Point 2750 Quick Start Manual - Page 14
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•
The 5GHz radio's AutoChannelSelect/SmartSelect setting described in the user guide must always
remain enabled to ensure that automatic 5GHz channel selection complies with European
requirements. The current setting for this feature is found in the 5GHz Radio Configuration Window
as described in the user guide.
•
The end-user must follow the procedures explained in this user guide in order to operate this device
in accordance with European regulatory requirements for Transmit Power control. This device
employs Transmit Power Control (TPC) to reduce the potential for interference to other
communication systems operating in the 5GHz frequency bands. The TPC feature implemented in
this Wireless LAN device must be configured by the end-user when operating in any European
Community country.
TPC Configuration Procedure
When operating this device using 5GHz channels in a European Community country, the end user or
installer is obligated to follow the procedure below in order to operate this device in accordance with
European regulatory requirements for Transmit Power control.
The "Transmit Power" setting described in the 5GHz Radio Advanced Configuration Window is used to
reduce this device's power by 0dB (100% power), -3dB (half power), -6dB (quarter power) if required. The
default setting is 100% which represents no reduction in power.
CHECK CURRENT LINK RATES OF ASSOCIATED STATION DEVICES:
1
After initial installation, use the 5GHz Statistics Window to view all currently associated
Wireless station devices operating on 5GHz channels. Check current transmit & receive link rates
of each station by clicking on the applicable, underlined links. The highest possible link rate is
54Mbps (Note 108Mbps Turbo operation in 5GHz is not allowed in the European Community).
CHECK IF MAXIMUM LINK RATES ARE CURRENTLY ACHIEVED:
2
If the majority of station link rates found in step 1 are:
• lower than the maximum possible link rate values of 54Mbps, then no further action is required.
(This indicates that this device must continue to transmit at full power to maintain acceptable
performance).
OR
• equal to the maximum possible link rates, then a reduction in the access point's transmit power
may be possible. Please proceed to step 3).
REDUCE POWER TO 50% AND RECHECK LINK RATE:
(user interruption will occur during the following process)
3
Set the access point's "Transmit Power" to Half (-3dB) using the pull-down menu in the 5 GHz
radio advanced configuration window. Reboot access point for setting to take effect.
4
Check the current link rates as before. If the link rate values for the majority of associated
station devices are now:
• lower than 54Mbps, the -3dB power reduction is not necessary. Change the "Transmit Power"
setting back to 100% as explained in step 3). No further action is required.
OR
• equal to the maximum possible link rate values, then the -3dB reduction has no adverse affect
on operation and further reduction may be needed. Proceed to step 5.
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