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LoRaWAN Regional Parameters ©2016 LoRa™ Alliance Page 27 of 45 The authors reserve the right to change specifications without notice. ChMaskCntl ChMask applies to 0 Channels 0 to 15 1 Channels 16 to 31 .. .. 4 Channels 64 to 71 5 RFU 6 All 125 kHz ON ChMask applies to channels 64 to 71 7 All 125 kHz OFF ChMask applies to channels 64 to 71 Table 30: ChMaskCntl value table 1 If ChMaskCntl = 6 (resp 7) then 125 kHz channels are enabled (resp disabled). 2 Simultaneously the channels 64 to 67 are set according to the ChMask bit mask. 3 Note: ACMA regulation requires hopping over at least 20 channels 4 when using channels that do not meet a minimum 6 dB bandwidth of 5 500 kHz. 6 2.5.6 AU915-928 Maximum payload size 7 The maximum MACPayload size length (M) is given by the following table. It is derived from 8 the maximum allowed transmission time at the PHY layer taking into account a possible 9 repeater encapsulation. The maximum application payload length in the absence of the 10 optional FOpt MAC control field (N) is also given for information only. The value of N might 11 be smaller if the FOpt field is not empty: 12 13 DataRate M N 0 19 11 1 61 53 2 134 126 3 250 242 4 250 242 5:7 Not defined 8 41 33 9 117 109 10 230 222 11 230 222 12 230 222 13 230 222 14:15 Not defined 14 Table 31: AU915-928 maximum payload size 15 The greyed lines correspond to the data rates that may be used by an end-device behind a 16 repeater. 17 18 If the end-device will never operate with a repeater then the maximum application payload 19 length in the absence of the optional FOpt control field should be: 20 21

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