User guide

Adjusting Transmitter Output Power Configuring for the Destination
382
pmp-0229 (Mar 2013)
Reboot
When you click this button
1. the module reboots.
2. any changes that you saved by a click of the Save Changes button are
implemented.
Adjusting Transmitter Output Power
Authorities may require transmitter output power to be adjustable and/or lower than the highest
that a module produces. Adjustable power modules include a Radio tab parameter to reduce power
on an infinite scale to achieve compliance. If you set this parameter to lower than the supported
range extends, the value is automatically reset to the lowest supported value. The high end of the
supported range does not vary from radio to radio.
Although transmitter output power is settable in the PMP Series 400 OFDM AP, this AP
automatically sets the transmitter output power in its SMs through a feature named Auto-TPC. The
conceptual reason for this feature is OFDM reception in the AP is more sensitive to large
differences in power levels received from its SMs than is its standard Canopy single-carrier AP
counterpart. The OFDM AP sets the SM to the lesser of the following two levels:
• 10 dBm. This is the maximum allowed, because the SM operates with its integrated antenna,
and regulation permits EIRP of not greater than 27 dBm.
• power level such that the power that the AP receives from the SM is not greater than 60 dBm.
See also Procedure 3: Reducing transmitter output power on Page 155.
The professional installer of the equipment has the responsibility to
• maintain awareness of applicable regulations.
• calculate the permissible transmitter output power for the module.
• confirm that the initial power setting is compliant.
• confirm that the power setting is compliant following any reset of the module to factory
defaults.
The total gain per antenna in 900-MHz and 5.7-GHz radios is stated in Table 58.