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LoRaWAN® Regional Parameters v1.0.3revA

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LoRaWAN 1.0.3 Regional Parameters ©2018 LoRa™ Alliance Page 24 of 71 The authors reserve the right to change specifications without notice. 518 If ChMaskCntl = 6 then 125 kHz channels are enabled, if ChMaskCntl = 7 then 125 kHz 519 channels are disabled. Simultaneously the channels 64 to 71 are set according to the ChMask 520 bit mask. The DataRate specified in the command need not be valid for channels specified in 521 the ChMask, as it governs the global operational state of the end-device. 522 523 Note: FCC regulation requires hopping over at least 50 channels when 524 using maximum output power. It is possible to have end-devices with 525 less channels when limiting the end-device conducted transmit power to 526 21 dBm. 527 Note: A common network server action may be to reconfigure a device 528 through multiple LinkAdrReq commands in a contiguous block of MAC 529 Commands. For example to reconfigure a device from 64 channel 530 operation to the first 8 channels could contain two LinkAdrReq, the first 531 (ChMaskCntl = 7) to disable all 125kHz channels and the second 532 (ChMaskCntrl = 0) to enable a bank of 8 125kHz channels. 533 534 2.3.6 US902-928 Maximum payload size 535 The maximum MACPayload size length (M) is given by the following table. It is derived from 536 the maximum allowed transmission time at the PHY layer taking into account a possible 537 repeater encapsulation. The maximum application payload length in the absence of the 538 optional FOpt MAC control field (N) is also given for information only. The value of N MAY be 539 smaller if the FOpt field is not empty: 540 541 542 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 Table 15: US902-928 maximum payload size (repeater compatible) 543 544 The greyed lines correspond to the data rates that may be used by an end-device behind a 545 repeater. 546 If the end-device will never operate under a repeater then the maximum application payload 547 length in the absence of the optional FOpt control field SHOULD be: 548 549 DataRate M N 0 19 11

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