Before revision: Asynchronous start-stop is the physical layer used to connect computers to modems for many dial-up Internet access applications, using a data link framing protocol such as PPP to create packets made up out of asynchronous serial characters .
After revision: Asynchronous start-stop is the lower data-linksecond (encapsulating) layer used to connect computers to modems for many dial-up Internet access applications, using a data link framing protocol such as PPP to create packets made up out of asynchronous serial characters .