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LoRaWAN Regional Parameters ©2016 LoRa™ Alliance Page 15 of 45 The authors reserve the right to change specifications without notice. Table 12: US902-928 maximum payload size (repeater compatible) 1 The greyed lines correspond to the data rates that may be used by an end-device behind a 2 repeater. 3 If the end-device will never operate under a repeater then the maximum application payload 4 length in the absence of the optional FOpt control field should be: 5 6 DataRate M N 0 19 11 1 61 53 2 133 125 3 250 242 4 250 242 5:7 Not defined 8 61 53 9 137 129 10 250 242 11 250 242 12 250 242 13 250 242 14:15 Not defined Table 13 : US902-928 maximum payload size (not repeater compatible) 7 2.2.7 US902-928 Receive windows 8 The RX1 receive channel is a function of the upstream channel used to initiate the 9 data exchange. The RX1 receive channel can be determined as follows. 10 o RX1 Channel Number = Transmit Channel Number modulo 8 11 The RX1 window data rate depends on the transmit data rate (see Table 14 below). 12 The RX2 (second receive window) settings uses a fixed data rate and frequency. 13 Default parameters are 923.3MHz / DR8 14 15 Upstream data rate Downstream data rate RX1DROffset 0 1 2 3 DR0 DR10 DR9 DR8 DR8 DR1 DR11 DR10 DR9 DR8 DR2 DR12 DR11 DR10 DR9 DR3 DR13 DR12 DR11 DR10 DR4 DR13 DR13 DR12 DR11 Table 14: Data rate mapping 16 The allowed values for RX1DROffset are in the [0:3] range. Values in the range [4:7] are 17 reserved for future use. 18 2.2.8 US902-928 Default Settings 19 The following parameters are recommended values for the US902-928 band. 20 RECEIVE_DELAY1 1 s 21 RECEIVE_DELAY2 2 s (must be RECEIVE_DELAY1 + 1s) 22 JOIN_ACCEPT_DELAY1 5 s 23 JOIN_ACCEPT_DELAY2 6 s 24 MAX_FCNT_GAP 16384 25 ADR_ACK_LIMIT 64 26

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