6. Glossary
| Term | Definition |
|---|---|
| BLE | Bluetooth low energy. |
| CSS | Chirp Spread Spectrum. |
| DLRV | Downlink route validity: the time for which the Amazon Sidewalk cloud keeps a downlink route to an Endpoint on a Sub-GHz link (FSK or LoRa); the keep-alive (KA) refreshes it. |
| Downlink | Data sent from a Gateway to an Endpoint. |
| Endpoint | A device that accesses services of Amazon Sidewalk to transport messages to and from the application services through AWS IoT. |
| FFN | Frustration Free Networking. |
| FFS | Frustration Free Setup. |
| FSK | 2-Gaussian Frequency Shift Keying modulation scheme. |
| Gateway | Connections between Endpoints and Amazon Sidewalk are established and maintained through these devices. Gateways are Amazon and Ring devices. Amazon Sidewalk messages are transported between Amazon Sidewalk and the AWS IoT service through these devices. |
| ISR | Interrupt Service Routine. |
| KA | Keep-alive: an uplink the Amazon Sidewalk stack sends periodically on a Sub-GHz link (FSK, or LoRa in Profile B or Profile C) to keep the downlink route valid. |
| LoRa | Long Range proprietary protocol based on Chirp Spread Spectrum modulation scheme (CSS). |
| MTU | Maximum Transmission Unit. |
| PAL | Platform abstraction Layer. |
| SBDT | Sidewalk Bulk Data Transfer. |
| Sid API | Amazon Sidewalk Application Programming Interface. |
| Uplink | Data sent from an Endpoint to a Gateway. |