Motorola 5440AP User Manual - Page 17

Canopy 400 Series OFDM AP and SM User Guide GHz band because the regulations are for spectral power density and with half the channel size (10 MHz vs 20 MHz), Canopy OFDM is allowed half the power (27 dBm vs 30 dBm). To meet 27 dBm EIRP with the 17 dBi antenna that comes with the 5400AP, the maximum setting allowed is 10 dBm (the default) since 27-17=10. If the 5400APC has been purchased and the operator has provided the AP antenna, the Transmitter Output Power must be configured based on that antenna and consistent with local or regional regulations. For example, if a 5400APC is being used with a 12 dBi antenna, then the maximum setting allowed to meet 27 dBm EIRP is the full 15 dBm of which the radio is capable, since 27-12=15. 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, not by the operator. The AP's Auto-TPC (Transmit Power Control) sets each SM's Transmitter Output Power to the lesser of • 10 dBm, the maximum allowed on the SM since it has an integrated 17 dBi antenna and a regulatory maximum EIRP of 27 dBm (27-17=10) • a power level so that the received power at the AP from that SM is not greater than 60 dBm. Canopy 400 Series APs use Auto-TPC because OFDM technology is more sensitive to large differences in power levels from SMs than the single carrier technology used in Canopy FSK. Canopy 400 Series modules display the typical Canopy "Receive Power Level" but due to the different modulation technique no "jitter" is calculated or displayed. 4.3 DOWNLINK DATA %, RANGE, AND CONTROL SLOTS The Downlink Data % parameter on the AP's "Configuration => General" page can be set in 1% increments between 10% and 90%. (Standard Canopy can be set between 1% and 99%, although internal calculations don't result in that extreme of slot assignment between uplink and downlink.) The default is 75%, the same as standard Canopy. The default Range, set on the AP's "Configuration => General" page, is 5 miles, but can be set in 1 mile increments between 1 and 10 miles. If the Range is set to greater than 5 miles, then the Downlink Data % can be a maximum of 85%, else some close-in SMs won't register due to details of the Canopy scheduler. For example, a Range of 6 miles and a Downlink Data % of 90% is not allowed. Operationally, Version 1, April 2008 Page 17 of 40