![Windows 10 install media](https://cdn1.cdnme.se/5447227/9-3/14_64e61dfbddf2b36505b4c7c8.png)
![minimum rssi minimum rssi](https://i.stack.imgur.com/0QFTp.png)
LPWAN name is formed by three components: Low Power, Wide Area, and Network. LoRa uses LPWAN standard (Low Power Wide Area Network). The technology covers the physical layer, while other technologies and protocols such as LoRaWAN (Long Range Wide Area Network) cover the upper layers (read more on ). LoRa enables long-range transmissions (more than 10 km in rural areas) with low power consumption. LoRa uses license-free sub-gigahertz radio frequency bands like 433 MHz, 868 MHz (Europe), 915 MHz (Australia and South/North America ), and 923 MHz ( Asia ). In case you didn’t know, LoRa stands for Long Range radio, which is a wireless protocol developed by Semtech (you’ll find their SX127x chipset on Heltec boards). While this reading is less accurate, and is the same for all Edge Switch's connected to a specific ONS-S8's optical port (OPT 1 - OPT 8), it can still be useful for troubleshooting fiber issues.Fig 1. ONS-S8 Rx Power is similar to the Rx Power column, but is a measurement of the combined amount of light received by the ONS-S8's PON transceiver (ONS-SX-SFP) from the PON transceivers (ONS-CX-SFP) of all of the Edge Switches that are optically connected to it. The ONS-CX-SFP is expected to have a TSSI between 0 and 4 dBm. Tx Power is a TSSI (Transmitted Signal Strength Indicator), which is a measurement of the amount of light transmitted by the Edge Switch's PON transceiver (ONS-CX-SFP) to the ONS-S8's PON transceiver (ONS-SX-SFP). The ONS-CX-SFP supports a maximum RSSI of -3 dBm and a minimum RSSI of -27 dBm. Rx Power is an RSSI (Received Signal Strength Indicator), which is a measurement of the amount of light received by the Edge Switch's PON transceiver (ONS-CX-SFP) from the ONS-S8's PON transceiver (ONS-SX-SFP). (NOTE: This page is only available when configured as a Connect Spectra™ system) The System → RSSI page displays the list of Edge Switches with the corresponding receive and transmit signal strength for each switch's PON transceiver (ONS-CX-SFP) and the receive signal strength of the ONS-S8's PON transceiver (ONS-SX-SFP).
![Windows 10 install media](https://cdn1.cdnme.se/5447227/9-3/14_64e61dfbddf2b36505b4c7c8.png)