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LoRaWAN Regional Parameters ©2016 LoRa™ Alliance Page 32 of 45 The authors reserve the right to change specifications without notice. 2.6.6 CN470-510 Maximum payload size 1 The maximum MACPayload size length (M) is given by the following table. It is derived from 2 the maximum allowed transmission time at the PHY layer taking into account a possible 3 repeater encapsulation. The maximum application payload length in the absence of the 4 optional FOpt MAC control field (N) is also given for information only. The value of N might 5 be smaller if the FOpt field is not empty: 6 7 DataRate M N 0 59 51 1 59 51 2 59 51 3 123 115 4 230 222 5 230 222 6:15 Not defined Table 36: CN470-510 maximum payload size 8 9 2.6.7 CN470-510 Receive windows 10 The RX1 receive channel is a function of the upstream channel used to initiate the 11 data exchange. The RX1 receive channel can be determined as follows. 12 o RX1 Channel Number = Uplink Channel Number modulo 48, for example, 13 when transmitting channel number is 49, the rx1 channel number is 1. 14 The RX1 window data rate depends on the transmit data rate (see Table Table 37: 15 CN470-510 Data rate offset below). 16 The RX2 (second receive window) settings uses a fixed data rate and frequency. 17 Default parameters are 505.3 MHz / DR0 18 19 20 21 RX1DROffset 0 1 2 3 4 5 Upstream data rate Downstream data rate in RX1 slot DR0 DR0 DR0 DR0 DR0 DR0 DR0 DR1 DR1 DR0 DR0 DR0 DR0 DR0 DR2 DR2 DR1 DR0 DR0 DR0 DR0 DR3 DR3 DR2 DR1 DR0 DR0 DR0 DR4 DR4 DR3 DR2 DR1 DR0 DR0 DR5 DR5 DR4 DR3 DR2 DR1 DR0 Table 37: CN470-510 Data rate offset 22 The allowed values for RX1DROffset are in the [0:3] range. Values in the range [4:7] are 23 reserved for future use. 24 2.6.8 CN470-510 Default Settings 25 The following parameters are recommended values for the CN470-510 band. 26 RECEIVE_DELAY1 1 s 27 RECEIVE_DELAY2 2 s (must be RECEIVE_DELAY1 + 1s) 28 JOIN_ACCEPT_DELAY1 5 s 29 JOIN_ACCEPT_DELAY2 6 s 30