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Download as PDF; Printable version; In other projects Appearance. move to sidebar hide. Help ... Bell 103 modem; Bell 202 modem; Bell 212A This page was ...
A typical volume of Bell System Practices from the 1970s. The Bell System Practices (BSPs) is a compilation of technical publications which describes the best methods of engineering, constructing, installing, and maintaining the telephone plant of the Bell System under direction of AT&T and Bell Telephone Laboratories. [1]
The Bell DataPhone 300 used the same protocol as the Bell 103. This modem is from 1978. The Bell 103 modem or Bell 103 dataset was the second commercial modem for computers, released by AT&T Corporation in 1963. [1] [2] It allowed digital data to be transmitted over regular unconditioned telephone lines at a speed of 300 bits per second.
The back of a Teletype Model 33 teleprinter with a Bell 101C Data Set in the pedestal, 1963.. The Bell 101 Data Set was the first commercial modem for computers, released by AT&T Corporation in 1958 for use by SAGE, and made commercially available in 1959, shortly after AT&T's Bell Labs announced their 110 baud modulation frequencies.
Hayes Microcomputer Products was a US-based manufacturer of modems.The company is known for the Smartmodem, which introduced a control language for operating the functions of the modem via the serial interface, in contrast to manual operation with front-panel switches.
The T-carrier is a hardware specification for carrying multiple time-division multiplexed (TDM) telecommunications channels over a single four-wire transmission circuit. It was developed by AT&T at Bell Laboratories ca. 1957 and first employed by 1962 for long-haul pulse-code modulation (PCM) digital voice transmission with the D1 channel bank.
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A dial-up modem transmits computer data over an ordinary switched telephone line that has not been designed for data use. It was once a widely known technology, mass-marketed globally dial-up internet access. In the 1990s, tens of millions of people in the United States alone used dial-up modems for internet access. [3]