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LoRaWAN Regional Parameters ©2016 LoRa™ Alliance Page 19 of 45 The authors reserve the right to change specifications without notice. 2.3.5 CN779-787 LinkAdrReq command 1 2 The CN780 LoRaWAN only supports a maximum of 16 channels. When ChMaskCntl field is 3 0 the ChMask field individually enables/disables each of the 16 channels. 4 5 ChMaskCntl ChMask applies to 0 Channels 1 to 16 1 RFU .. .. 4 RFU 5 RFU 6 All channels ON The device should enable all currently defined channels independently of the ChMask field value. 7 RFU Table 18: ChMaskCntl value table 6 If the ChMask field value is one of values meaning RFU, then end-device should reject the 7 command and unset the "Channel mask ACK" bit in its response. 8 2.3.6 CN779-787 Maximum payload size 9 The maximum MACPayload size length (M) is given by the following table. It is derived from 10 limitation of the PHY layer depending on the effective modulation rate used taking into 11 account a possible repeater encapsulation layer. The maximum application payload length in 12 the absence of the optional FOpt control field (N) is also given for information only. The 13 value of N might be smaller if the FOpt field is not empty: 14 15 DataRate M N 0 59 51 1 59 51 2 59 51 3 123 115 4 230 222 5 230 222 6 250 242 7 230 222 8:15 Not defined Table 19: CN780 maximum payload size 16 If the end-device will never operate with a repeater then the maximum application payload 17 length in the absence of the optional FOpt control field should be: 18 19 DataRate M N 0 59 51 1 59 51 2 59 51 3 123 115 4 250 242 5 250 242 6 250 242 7 250 242

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