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LoRaWAN 1.0.2 Regional Parameters ©2017 LoRa Alliance™ Page 21 of 55 The authors reserve the right to change specifications without notice. 2.3.5 CN779-787 LinkAdrReq command 587 588 The CN780 LoRaWAN only supports a maximum of 16 channels. When ChMaskCntl field is 589 0 the ChMask field individually enables/disables each of the 16 channels. 590 591 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 21: ChMaskCntl value table 592 593 If the ChMask field value is one of values meaning RFU, then end-device should reject the 594 command and unset the "Channel mask ACK" bit in its response. 595 2.3.6 CN779-787 Maximum payload size 596 The maximum MACPayload size length (M) is given by the following table. It is derived from 597 limitation of the PHY layer depending on the effective modulation rate used taking into 598 account a possible repeater encapsulation layer. The maximum application payload length in 599 the absence of the optional FOpt control field (N) is also given for information only. The 600 value of N might be smaller if the FOpt field is not empty: 601 602 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 22: CN780 maximum payload size 603 604 If the end-device will never operate with a repeater then the maximum application payload 605 length in the absence of the optional FOpt control field should be: 606 607 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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