User`s manual

Report No.：T11112830801-RT-1
Page 18 of 48
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7.2 RF OUTPUT POWER, TRANSMIT POWER CONTROL (TPC) AND
POWER DENSITY
DEFINITION
ETSI EN 301 893 clause 4.4.1
RF Output Power : The RF output power is the mean equivalent isotropically radiated
power (EIRP) during a transmission burst.
Transmit Power Control (TPC) : Transmit Power Control (TPC) is a mechanism to be
used by the RLAN device to ensure a mitigation factor of at least 3 dB on the aggregate
power from a large number of devices. This requires the RLAN device to have a TPC
range from which the lowest value is at least 6 dB below the values for mean EIRP given
in table 1.
TPC is not required for channels whose nominal bandwidth falls completely within the
band 5 150 MHz to 5 250 MHz.
Power Density : The power density is the mean Equivalent Isotropically Radiated Power
(EIRP) density during a transmission burst.
LIMITS
ETSI EN 301 893 clause 4.4.2
RF output power and power density at the highest power level
For devices with TPC, the RF output power and the power density when configured to
operate at the highest stated power level of the TPC range shall not exceed the levels
given in table 1.
For devices without TPC, the limits in table 1 shall be reduced by 3 dB, except when
operating on channels whose nominal bandwidth falls completely within the band 5150
MHz to 5250 MHz.
Table 1: Mean EIRP limits for RF output power and power density at the highest
power level
Frequency Range Mean EIRP Limit Mean EIRP Density Limit
5150 MHz to 5350 MHz 23 dBm 10 dBm/MHz
5470 MHz to 5725 MHz 30 dBm (see note) 17 dBm/MHz (see note)
NOTE : For Slave devices without a Radar Interference Detection function the mean EIRP shall be less
than 23 dBm and the mean EIRP density shall be less than 10 dBm/MHz.