Issue link: https://read.uberflip.com/i/1428362
LoRaWAN 1.0.2 Regional Parameters ©2017 LoRa Alliance™ Page 38 of 55 The authors reserve the right to change specifications without notice. 2.7 AS923MHz ISM Band 999 2.7.1 AS923 Preamble Format 1000 The following synchronization words should be used: 1001 1002 Modulation Sync word Preamble length LORA 0x34 8 symbols GFSK 0xC194C1 5 bytes Table 47: AS923 synch words 1003 2.7.2 AS923 ISM Band channel frequencies 1004 This section applies to regions where the frequencies [923…923.5MHz] are comprised in the 1005 ISM band, which is the case for the following countries: 1006 Brunei [923-925 MHz] 1007 Cambodia [923-925 MHz] 1008 Indonesia [923-925 MHz] 1009 Japan [920-928 MHz] 1010 Laos [923-925 MHz] 1011 New Zealand [915-928 MHz] 1012 Singapore [920-925 MHz] 1013 Taiwan [922-928 MHz] 1014 Thailand [920-925 MHz] 1015 Vietnam [920-925 MHz] 1016 The network channels can be freely attributed by the network operator. However the two 1017 following default channels must be implemented in every AS923MHz end-device. Those 1018 channels are the minimum set that all network gateways should always be listening on. 1019 1020 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 48: AS923 default channels 1021 Those default channels must be implemented in every end-device and cannot be modified 1022 through the NewChannelReq command and guarantee a minimal common channel set 1023 between end-devices and network gateways. 1024 AS923MHz ISM band end-devices should use the following default parameters 1025 Default EIRP: 16 dBm 1026 AS923MHz end-devices should feature a channel data structure to store the parameters of 1027 at least 16 channels. A channel data structure corresponds to a frequency and a set of data 1028 rates usable on this frequency. 1029