Issue link: https://read.uberflip.com/i/1428359
LoRaWAN 1.0.3 Regional Parameters ©2018 LoRa™ Alliance Page 21 of 71 The authors reserve the right to change specifications without notice. 2.3 US902-928MHz ISM Band 425 This section defines the regional parameters for the USA, Canada and all other countries 426 adopting the entire FCC-Part15 regulations in 902-928 ISM band. 427 2.3.1 US902-928 Preamble Format 428 The following synchronization words SHOULD be used: 429 430 Modulation Sync word Preamble length LORA 0x34 8 symbols 431 LoRaWAN does not make use of GFSK modulation in the US902-928 ISM band. 432 2.3.2 US902-928 Channel Frequencies 433 The 915 MHz ISM Band SHALL be divided into the following channel plans. 434 • Upstream – 64 channels numbered 0 to 63 utilizing LoRa 125 kHz BW varying from 435 DR0 to DR3, using coding rate 4/5, starting at 902.3 MHz and incrementing linearly 436 by 200 kHz to 914.9 MHz 437 • Upstream – 8 channels numbered 64 to 71 utilizing LoRa 500 kHz BW at DR4 438 starting at 903.0 MHz and incrementing linearly by 1.6 MHz to 914.2 MHz 439 • Downstream – 8 channels numbered 0 to 7 utilizing LoRa 500 kHz BW at DR8 to 440 DR13, starting at 923.3 MHz and incrementing linearly by 600 kHz to 927.5 MHz 441 442 443 Figure 1: US902-928 channel frequencies 444 915 MHz ISM band end-devices are required to operate in compliance with the relevant 445 regulatory specifications, the following note summarizes some of the current (March 2017) 446 relevant regulations. 447 Frequency-Hopping, Spread-Spectrum (FHSS) mode, which requires 448 the device transmit at a measured conducted power level no greater 449 than +30 dBm, for a period of no more than 400 msec and over at least 450 50 channels, each of which occupy no greater than 250 kHz of 451 bandwidth. 452 Digital Transmission System (DTS) mode, which requires that the 453 device use channels greater than or equal to 500 kHz and comply with 454 a conducted Power Spectral Density measurement of no more than +8 455 dBm per 3 kHz of spectrum. In practice, this limits the conducted output 456 power of an end-device to +26 dBm. 457 Hybrid mode, which requires that the device transmit over multiple 458 channels (this may be less than the 50 channels required for FHSS 459 mode, but is recommended to be at least 4) while complying with the 460 Power Spectral Density requirements of DTS mode and the 400 msec 461 903.0 902.3 904.6 914.2 …. 923.3 923.9 927.5 …. 8x downlink channels 64 + 8 uplink channels