These small text snippets tell a program how to "connect" to a database.
If you are looking for setup files for a device with "300 Mbps" connection capability (often labeled N300): Routers like the Tenda N300 or Strong Repeater 300 use specific settings you can download or export as a file.
Use tools like Ookla Speedtest or nPerf to check if your download speed hits the 300 Mbps mark.