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LoRaWAN Regional Parameters ©2016 LoRa™ Alliance Page 14 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 11: ChMaskCntl value table 1 If ChMaskCntl = 6 then 125 kHz channels are enabled, if ChMaskCntl = 7 then 125 kHz 2 channels are disabled. Simultaneously the channels 64 to 71 are set according to the 3 ChMask bit mask. The DataRate specified in the command need not be valid for channels 4 specified in the ChMask, as it governs the global operational state of the end-device. 5 6 Note: FCC regulation requires hopping over at least 50 channels when 7 using maximum output power. It is possible to have end-devices with 8 less channels (at least six 125 kHz channels) when limiting the end- 9 device transmit power to 21 dBm. 10 Note: A common network server action may be to reconfigure a device 11 through multiple LinkAdrReq commands in a contiguous block of MAC 12 Commands. For example to reconfigure a device from 64 channel 13 operation to the first 8 channels could contain two LinkAdrReq, the first 14 (ChMaskCntl = 7) to disable all 125kHz channels and the second 15 (ChMaskCntrl = 0) to enable a bank of 8 125kHz channels. 16 17 2.2.6 US902-928 Maximum payload size 18 The maximum MACPayload size length (M) is given by the following table. It is derived from 19 the maximum allowed transmission time at the PHY layer taking into account a possible 20 repeater encapsulation. The maximum application payload length in the absence of the 21 optional FOpt MAC control field (N) is also given for information only. The value of N might 22 be smaller if the FOpt field is not empty: 23 24 DataRate M N 0 19 11 1 61 53 2 133 125 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

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