The modem is one of the most consequential pieces of technology ever built. It connected the world — not as a metaphor, but literally, at a specific historical moment, in hundreds of millions of homes. Before it, a computer was a tool. With it, a computer became a window onto everything else. This site tells that story from the beginning.
Six epochs from the telegraph of 1837 to the 5G modems of today. The theory of Nyquist and Shannon. The Bell 103, the Hayes Smartmodem, the 56k war, the death of dial-up, the rise of broadband and mobile. A complete chronological account.
Fifteen key devices from every era: the Bell 103A, the Hayes Smartmodem 300, the USR Sportster, the Motorola SURFboard, the Huawei E220 USB dongle, the Qualcomm Snapdragon X55. Specifications, descriptions, and historical significance for each.
A detailed technical reference: the Nyquist and Shannon theorems with formulas, FSK, QAM and OFDM modulation, V.34 and V.90 handshake protocols, error correction and compression, how DSL and ADSL work, MIMO, beamforming, and carrier aggregation.
The human side of the modem era. The sound of the dial-up handshake. The BBS sysops who ran their boards through the night. The overnight download. The AOL discs. The 56k standards war from the consumer's point of view. The day broadband arrived.
From the first electrical signal carrying encoded information to the chip in your smartphone: