The Bell 212A modulation scheme defined a standard method of transmitting full-duplexasynchronous serial data at 1200 bits per second (bit/s) over analogue transmission lines. The equivalent, but incompatible ITU-T standard is V.22.
The Bell 212 Dataset is a 1979-vintage modem used for communicating over telephone lines at 300 or 1200 bit/s.[1] The 212A standard provides for the ability of a modem to auto-answer a ringing phone.[2]
Usageedit
The Bell 212A scheme was the most common standard used for 1200 bit/s transmission on US data networks such as CompuServe during the period that dial-up Internet access was the norm (1980s and 1990s).[3][2]
^"BSP 592-039-100: Data Set 212AR-L1A/2A -- Transmitter-Receiver -- Description and Operation", Bell System Practices, American Telephone & Telegraph Co, June 1979
^ abFrank J. Derfler, "The Universal Data Systems' 212 LP modem", InfoWorld, pp. 52-53, 9 August 1982.
^Frank J. Derfler Jr., "Selecting the right modem", PC Magazine, pp. 224-233, January 1983.
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bell, 212a, modulation, scheme, defined, standard, method, transmitting, full, duplex, asynchronous, serial, data, 1200, bits, second, over, analogue, transmission, lines, equivalent, incompatible, standard, contents, device, usage, also, referencesdevice, edi. The Bell 212A modulation scheme defined a standard method of transmitting full duplex asynchronous serial data at 1200 bits per second bit s over analogue transmission lines The equivalent but incompatible ITU T standard is V 22 Contents 1 Device 2 Usage 3 See also 4 ReferencesDevice editThe Bell 212 Dataset is a 1979 vintage modem used for communicating over telephone lines at 300 or 1200 bit s 1 The 212A standard provides for the ability of a modem to auto answer a ringing phone 2 Usage editThe Bell 212A scheme was the most common standard used for 1200 bit s transmission on US data networks such as CompuServe during the period that dial up Internet access was the norm 1980s and 1990s 3 2 See also editList of device bandwidthsReferences edit BSP 592 039 100 Data Set 212AR L1A 2A Transmitter Receiver Description and Operation Bell System Practices American Telephone amp Telegraph Co June 1979 a b Frank J Derfler The Universal Data Systems 212 LP modem InfoWorld pp 52 53 9 August 1982 Frank J Derfler Jr Selecting the right modem PC Magazine pp 224 233 January 1983 nbsp This article related to telecommunications is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Bell 212A amp oldid 1166717419, wikipedia, wiki, book, books, library,
