How computers used telephone calls and modems to establish temporary data connections.
What was dial-up internet?
Dial-up internet used a telephone modem to call an access number and create a data connection over a voice-grade line.
While connected, the telephone line was usually busy for ordinary calls.
Why was it important?
Dial-up brought email, discussion groups, web pages and online services to homes using infrastructure that already existed.
It helped make the internet a mass experience even though speeds were slow by modern standards.
What were its limits?
Connection setup took time. Throughput was limited by the channel, compression and noise. Calls could drop, and the line could not normally carry a simultaneous voice conversation.
Legacy
Broadband replaced dial-up for most users, but its architecture illustrates a complete communication chain: a computer, modem, telephone network, provider, addressing, authentication and data protocols.
Ai disclosure: written with the help of AI (ChatGPT). You are encouraged to point out errors and omissions.
