Issue link: https://read.uberflip.com/i/1428362
LoRaWAN 1.0.2 Regional Parameters ©2017 LoRa Alliance™ Page 15 of 55 The authors reserve the right to change specifications without notice. Table 12: TX power table 441 2.2.4 US902-928 JoinAccept CFList 442 The US902-928 LoRaWAN does not support the use of the optional CFlist appended to the 443 JoinAccept message. If the CFlist is not empty it is ignored by the end-device. 444 2.2.5 US902-928 LinkAdrReq command 445 For the US902-928 version the ChMaskCntl field of the LinkADRReq command has the 446 following meaning: 447 448 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 13: ChMaskCntl value table 449 If ChMaskCntl = 6 then 125 kHz channels are enabled, if ChMaskCntl = 7 then 125 kHz 450 channels are disabled. Simultaneously the channels 64 to 71 are set according to the 451 ChMask bit mask. The DataRate specified in the command need not be valid for channels 452 specified in the ChMask, as it governs the global operational state of the end-device. 453 454 Note: FCC regulation requires hopping over at least 50 channels when 455 using maximum output power. It is possible to have end-devices with 456 less channels when limiting the end-device conducted transmit power 457 to 21 dBm. 458 Note: A common network server action may be to reconfigure a device 459 through multiple LinkAdrReq commands in a contiguous block of MAC 460 Commands. For example to reconfigure a device from 64 channel 461 operation to the first 8 channels could contain two LinkAdrReq, the first 462 (ChMaskCntl = 7) to disable all 125kHz channels and the second 463 (ChMaskCntrl = 0) to enable a bank of 8 125kHz channels. 464 465 2.2.6 US902-928 Maximum payload size 466 The maximum MACPayload size length (M) is given by the following table. It is derived from 467 the maximum allowed transmission time at the PHY layer taking into account a possible 468 repeater encapsulation. The maximum application payload length in the absence of the 469 optional FOpt MAC control field (N) is also given for information only. The value of N might 470 be smaller if the FOpt field is not empty: 471 472 473 DataRate M N