An solution-simplest Modem is a commUnity tool this is capable of receiving messages, but cannot ship messages. Answer-simplest Modems had been typically the cHeapest modems to be had.
Answer-only modems were first manufactured with the aid of Bell SySTEMs round 1962. They used Frequency-Shift Keying (an early Frequency Modulation scheme) and acquired messages at a Charge of 2,half Hz. AT&T later came out with each an originate-simplest modem, model 113D, and an answer-simplest modem, model 113B/C. In 1977, Vadic got here out with the VA3467 Triple Modem, an answer-most effective modem; it was sold to Computer middle Operators and had a 1,two hundred-bps mode.
In 1981, Hayes brought its Smartmodem and later produced a solution-simplest modem version, which operated at the Server aspect but become much Greater high-priced than the acoustically coupled fashions (picked up audio alerts from a Smartphone Handset) that operated on the Client side. However, this solution-simplest modem become a low-cost, server-aspect modem that helped Make the Bulletin Board Systems (BBSs) flourish.
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