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Bell 101 modem; Bell 103 modem; Bell 202 modem; Bell 212A This page was last edited on 16 December 2024, at 22:17 (UTC). Text is available under the Creative Commons ...
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.
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.
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.
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The Bell 103 and Bell 202 modems used this technique. [15] Even today, North American caller ID uses 1200 baud AFSK in the form of the Bell 202 standard. Some early microcomputers used a specific form of AFSK modulation, the Kansas City standard , to store data on audio cassettes . [ 16 ]
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