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The readily available 103A2 gave an important boost to the use of remote low-speed terminals such as the Teletype Model 33 ASR and KSR, and the IBM 2741.AT&T reduced modem costs by introducing the originate-only 113D and the answer-only 113B/C modems.
However, the modem function was incidental to the multiplexing function, so they are not commonly included in the history of modems.The 201A operated half-duplex at 2,000 bit/s over normal phone lines, while the 201B provided full duplex 2,400 bit/s service on four-wire leased lines, the send and receive channels each running on their own set of two wires.The famous Bell 103A dataset standard was also introduced by AT&T in 1962.Disclaimer: has a zero-tolerance policy against illegal pornography.We do not own, produce or host the videos displayed on this website. We have no control over the content of these websites.One could also use the 212A with a 103A modem at 300 bit/s.
According to Vadic, the change in frequency assignments made the 212 intentionally incompatible with acoustic coupling, thereby locking out many potential modem manufacturers.
A common type of modem is one that turns the digital data of a computer into modulated electrical signal for transmission over telephone lines and demodulated by another modem at the receiver side to recover the digital data.
Modems are generally classified by the maximum amount of data they can send in a given unit of time, usually expressed in bits per second (symbol bit(s), sometimes abbreviated "bps"), or bytes per second (symbol B(s)).
For example, the ITU V.21 standard used audio frequency-shift keying with two possible frequencies, corresponding to two distinct symbols (or one bit per symbol), to carry 300 bits per second using 300 baud.
By contrast, the original ITU V.22 standard, which could transmit and receive four distinct symbols (two bits per symbol), transmitted 1,200 bits by sending 600 symbols per second (600 baud) using phase-shift keying.
For many years, the Bell System (AT&T) maintained a monopoly on the use of its phone lines and what devices could be connected to them.