Issue link: https://read.uberflip.com/i/1428371
LoRaWAN Regional Parameters ©2016 LoRa™ Alliance Page 34 of 45 The authors reserve the right to change specifications without notice. 2.7 AS923MHz ISM Band 1 2.7.1 AS923 Preamble Format 2 The following synchronization words should be used: 3 4 Modulation Sync word Preamble length LORA 0x34 8 symbols GFSK 0xC194C1 5 bytes Table 38: AS923 synch words 5 2.7.2 AS923 ISM Band channel frequencies 6 This section applies to regions where the frequencies [923…923.5MHz] are comprised in the 7 ISM band, which is the case for the following countries: 8 Brunei [923-925 MHz] 9 Cambodia [923-925 MHz] 10 Hong Kong [920-925 MHz] 11 Indonesia [923-925 MHz] 12 Japan [920-928 MHz] 13 Laos [923-925 MHz] 14 New Zealand [915-928 MHz] 15 Singapore [920-925 MHz] 16 Taiwan [922-928 MHz] 17 Thailand [920-925 MHz] 18 Vietnam [920-925 MHz] 19 The network channels can be freely attributed by the network operator. However the two 20 following default channels must be implemented in every AS923MHz end-device. Those 21 channels are the minimum set that all network gateways should always be listening on. 22 23 Modulation Bandwidth [kHz] Channel Frequency [MHz] FSK Bitrate or LoRa DR / Bitrate Nb Channels Duty cycle LoRa 125 923.20 923.40 DR0 to DR5 / 0.3-5 kbps 2 < 1% Table 39: AS923 default channels 24 Those default channels must be implemented in every end-device and cannot be modified 25 through the NewChannelReq command and guarantee a minimal common channel set 26 between end-devices and network gateways. 27 AS923MHz ISM band end-devices should use the following default parameters 28 Default ERP: 14 dBm 29