Silvanet Mesh Network
The Silvanet Mesh Network uses LoRa in the PHY layer and LoRaWAN for the Mesh Network.
The Silvanet Mesh Network consists of any number of Mesh Gateways that forward messages from Silvanet Wildfire Sensors and other Mesh Gateways to one or more Border Gateways. As forests may cause interference with mobile network coverage, the Dryad Mesh Network allows for large-scale off-grid deployments.
LoRa and LoRaWAN
Using the ISO model, Silvanet devices use in the PHY layer the long-range, low power LoRa modulation while in the MAC layer communication between devices is managed using LoRaWAN.
LoRaWAN uses frequencies based on country-specific regulations.
Updates to device firmware uses LoRaWAN to distribute updates over-the-air to all Silvanet devices in a Site simultaneously (FUOTA).
Silvanet devices and LoRaWAN
The proprietary Silvanet Mesh Gateway uses LoRaWAN to enable large-scale deployment of Silvanet Wildfire Sensors in the challenging environment of forests where leaves, trees, hills and topology often inhibit radio waves. In these types of environments, the range of traditional LoRaWAN gateways is very limited which prevents them from sending and receiving messages deep into forests.
Silvanet Border Gateways use LoRaWAN to communicate with Mesh Gateways or directly to Wildfire Sensors if they are within range. The Border Gateway forwards messages from sensors and Mesh Gateways to the Silvanet Cloud over the Internet using LTE-M mobile radio, fixed line (Ethernet) connectivity or satellite connectivity.
Border Gateways are responsible for transmitting messages to all devices in the Silvanet Mesh Network for firmware updates using FUOTA.
LoRa frequency bands
Silvanet Border Gateways, Mesh Gateways and Wildfire Sensors use the Silvanet Mesh Network which is based on LoRa. The frequency bands used by the Silvanet Mesh Network depends on the region in which it is deployed:
Europe: 868 MHz
North America: 915 MHz
Asia: 923 MHz
These are set in the Silvanet devices by Dryad.
Sensor frequency channels - Europe
Sensor frequency channels - North America
Max radio frequency power - EU and North America
Maximum radio frequency power transmitted (Tx) in frequency bands in which the sensor operates (EU and North America):
EU Max Tx power: 25 mW EIRP
US Max Tx power: 25 mW EIRP
LoRa Frequency bands (MHz) - select countries
For a full list, see The Things Network Frequency Plans by Country.
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