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LoRaWAN® Regional Parameters RP002-1.0.4 ©2022 LoRa Alliance ® Page 55 of 101 The authors reserve the right to change specifications without notice. 2.8.7 AU915-928 Receive Windows 1057 • The RX1 receive channel is a function of the upstream channel used to initiate the data 1058 exchange. The RX1 receive channel can be determined as follows: 1059 o RX1 Channel Number = Transmit Channel Number modulo NbChannel, 1060 where NbChannel is the number of active receive channels. 1061 • The RX1 window data rate depends on the transmit data rate (see Table 21). 1062 • The RX2 (second receive window) settings uses a fixed data rate and frequency. 1063 Default parameters are 923.3 MHz / DR8. 1064 1065 Upstream Data Rate Downstream Data Rate RX1DROffset 0 1 2 3 4 5 DR0 DR8 DR8 DR8 DR8 DR8 DR8 DR1 DR9 DR8 DR8 DR8 DR8 DR8 DR2 DR10 DR9 DR8 DR8 DR8 DR8 DR3 DR11 DR10 DR9 DR8 DR8 DR8 DR4 DR12 DR11 DR10 DR9 DR8 DR8 DR5 DR13 DR12 DR11 DR10 DR9 DR8 DR6 DR13 DR13 DR12 DR11 DR10 DR9 DR7 DR9 DR8 DR8 DR8 DR8 DR8 Table 37: AU915-928 downlink RX1 data rate mapping 1066 The allowed values for RX1DROffset are in the [0:5] range. Values in the range [6:7] are 1067 reserved for future use. 1068 2.8.8 AU915-928 Class B Beacon 1069 The downstream channel used for a given beacon is: 1070 Channel = [ ( _ _ ) ] 8 1071 • where beacon_time is the integer value of the 4-byte Time field of the beacon frame 1072 • where beacon_period is the periodicity of beacons, 128 seconds 1073 • where floor(x) designates rounding to the integer immediately inferior or equal to x 1074 Example: The first beacon will be transmitted on 923.3 MHz, the second 1075 on 923.9 MHz, the 9 th beacon will be on 923.3 MHz again. 1076 1077 Beacon Channel Number Frequency [MHz] 0 923.3 1 923.9 2 924.5 3 925.1 4 925.7 5 926.3 6 926.9 7 927.5 Table 38: AU915-928 beacon channels 1078 1079