User's Manual

6

4.2 TRANSMITTER OUTPUT POWER (AND NO JITTER)
The AP/BHM’s Transmitter Output Power is configured on the AP/BHM’s “Configuration => Radio” page.
Radio Frequency Transmit Output Power Range Factory Default Setting
Cyclone OFDM
5.7 GHz
5.8 GHz
-30 dBm to +20 dBm (US)
-30 dBm to +21 dBm (Outside US)
10 dBm
In most regulatory regions, including the US, Canada, and Europe, Cyclone 5700-360.OFDM Series
modules operating in the 5.8 GHz band are limited to 33 dBm with 10MHz channels (Equivalent Isotropic
Radiated Power). This is different than the 30 dBm EIRP allowed for Canopy FSK modules operating in
the 5.4 GHz band because the regulations are for spectral power density and with half the channel size
(10 MHz vs. 20 MHz).
To meet 27 dBm EIRP with the connectorized 18 dBi antenna (with 1 dB of cable loss) that comes with
the Cyclone OFDM AP, the maximum setting allowed is 10 dBm (the default) since 27-17=10.
If a connectorized AP has been purchased and the operator has provided the antenna, the Transmitter
Output Power must be configured based on that antenna and consistent with local or regional regulations.
For example, if a Cyclone 5700-360.OFDM Access Point is being used with a 15 dBi antenna, then the
maximum setting allowed to meet 27 dBm EIRP is the full 12 dBm of which the radio is capable.
IMPORTANT!
It is the responsibility of the operator and professional installer to ensure Transmitter Output Power is set within
regulatory limits for their country or region. These must be set or confirmed on initial configuration and after a
module is reset to factory defaults, and should be confirmed after the software on a module is upgraded.
In most cases the operator will want to set the AP’s Transmitter Output Power to the maximum allowed so
as to have the greatest overall range and the greatest range for 3X operation. It may be useful to reduce
Transmitter Output Power when Canopy systems are located close together, with good coverage given
because of their proximity and full power isn’t needed, or in cases where an operator is trying to reduce
interference from the Canopy system to other systems.
Each SM’s Transmitter Output Power is automatically set by the AP. The AP monitors the received power
from each SM, and adjusts each SM’s Transmitter Output Power so that the received power at the AP
from that SM is not greater than -60 dBm.
Cyclone OFDM Series networks use Auto-TPC because OFDM technology is more sensitive to large
differences in power levels from SMs operating at various distances from the AP than the single carrier
technology used in Canopy FSK. Cyclone OFDM Series modules display the typical Canopy “Receive
Power Level” as shown in Figure 2. Due to the different modulation technique no “jitter” is calculated or
displayed.