Issue link: https://read.uberflip.com/i/1428362
LoRaWAN 1.0.2 Regional Parameters ©2017 LoRa Alliance™ Page 17 of 55 The authors reserve the right to change specifications without notice. Table 16: US902-928 downlink RX1 data rate mapping 490 The allowed values for RX1DROffset are in the [0:3] range. Values in the range [4:7] are 491 reserved for future use. 492 2.2.8 US902-928 Class B beacon 493 The beacons are transmitted using the following settings: 494 DR 8 Corresponds to SF12 spreading factor with 500kHz bw CR 1 Coding rate = 4/5 Signal polarity Non-inverted As opposed to normal downlink traffic which uses inverted signal polarity frequencies 923.3 to 927.5MHz with 600kHz steps Beaconing is performed on the same channel that normal downstream traffic as defined in the Class A specification Table 17: US902-928 beacon settings 495 The downstream channel used for a given beacon is: 496 Channel = [ ( _ _ ) ] 8 497 whereby beacon_time is the integer value of the 4 bytes "Time" field of the beacon 498 frame 499 whereby beacon_period is the periodicity of beacons , 128 seconds 500 whereby floor(x) designates rounding to the integer immediately inferior or equal to x 501 502 Example: the first beacon will be transmitted on 923.3Mhz , the second 503 on 923.9MHz, the 9 th beacon will be on 923.3Mhz again. 504 505 506 Beacon channel nb Frequency [MHz] 0 923.3 1 923.9 2 924.5 3 925.1 4 925.7 5 926.3 6 926.9 7 927.5 507 508 The beacon frame content is: 509 Size (bytes) 5 4 2 7 3 2 BCNPayload RFU Time CRC GwSpecific RFU CRC 510 2.2.9 US902-928 Default Settings 511 The following parameters are recommended values for the US902-928 band. 512 RECEIVE_DELAY1 1 s 513 RECEIVE_DELAY2 2 s (must be RECEIVE_DELAY1 + 1s) 514 JOIN_ACCEPT_DELAY1 5 s 515 JOIN_ACCEPT_DELAY2 6 s 516 MAX_FCNT_GAP 16384 517