Issue link: https://read.uberflip.com/i/1428359
LoRaWAN 1.0.3 Regional Parameters ©2018 LoRa™ Alliance Page 22 of 71 The authors reserve the right to change specifications without notice. dwell time of FHSS mode. In practice this limits the measured 462 conducted power of the end-device to 21 dBm. 463 Devices which use an antenna system with a directional gain greater 464 than +6 dBi, but reduce the specified conducted output power by the 465 amount in dB of directional gain over +6 dBi. 466 US902-928 end-devices MUST be capable of operating in the 902 to 928 MHz frequency band 467 and MUST feature a channel data structure to store the parameters for 72 channels. This 468 channel data structure contains a list of frequencies and the set of data rates available for 469 each frequency. 470 471 If using the over-the-air activation procedure, the end-device SHALL transmit the Join- 472 request message on random 125 kHz channels amongst the 64 125kHz channels defined 473 using DR0 and on 500 kHz channels amongst the 8 500kHz channels defined using DR4. 474 The end-device SHALL change channels for every transmission. 475 For rapid network acquisition in mixed gateway channel plan environments, the device 476 SHOULD follow a random channel selection sequence which efficiently probes the octet 477 groups of eight 125 kHz channels followed by probing one 500 kHz channel each pass. 478 Each consecutive pass SHOULD NOT select a channel that was used in a previous pass, 479 until a Join-request is transmitted on every channel, after which the entire process can 480 restart. 481 Example: First pass: Random channel from [0-7], followed by [8-15]… [56-63], then 64 482 Second pass: Random channel from [0-7], followed by [8-15]… [56-63], then 483 65 484 Last pass: Random channel from [0-7], followed by [8-15]… [56-63], then 71 485 Personalized devices SHALL have all 72 channels enabled following a reset and shall use the 486 channels for which the device's default data-rate is valid. 487 2.3.3 US902-928 Data Rate and End-device Output Power encoding 488 FCC regulation imposes a maximum dwell time of 400ms on uplinks. The TxParamSetupReq 489 MAC command MUST not be implemented by US902-928 devices. 490 The following encoding is used for Data Rate (DR) and End-device conducted Power 491 (TXPower) in the US902-928 band: 492 493 DataRate Configuration Indicative physical bit rate [bit/sec] 0 LoRa: SF10 / 125 kHz 980 1 LoRa: SF9 / 125 kHz 1760 2 LoRa: SF8 / 125 kHz 3125 3 LoRa: SF7 / 125 kHz 5470 4 LoRa: SF8 / 500 kHz 12500 5:7 RFU 8 LoRa: SF12 / 500 kHz 980 9 LoRa: SF11 / 500 kHz 1760 10 LoRa: SF10 / 500 kHz 3900 11 LoRa: SF9 / 500 kHz 7000 12 LoRa: SF8 / 500 kHz 12500 13 LoRa: SF7 / 500 kHz 21900