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46 relations: Analog signal, Baud, Bell 103 modem, Bell 212A, Bit, Communication protocol, Conexant, Cyclic redundancy check, D-subminiature, Data, Data-rate units, Digital data, Duplex (telecommunications), Fax, First-mover advantage, Frequency-shift keying, H.324, Hayes Microcomputer Products, Integrated Services Digital Network, ITU V.23, ITU-T, Kilobit, Latin, Link Access Procedure for Modems, List of interface bit rates, LZ77 and LZ78, Megabit, Microcom Networking Protocol, Modem, Modulation, OSI model, Phase-shift keying, Plain old telephone service, Pulse-code modulation, Quadrature amplitude modulation, RS-232, RS-422, RS-423, Shaping codes, Symbol rate, Trellis modulation, USRobotics, V.61, V.92, Videotelephony, 56 kbit/s line.
Analog signal
An analog signal is any continuous signal for which the time varying feature (variable) of the signal is a representation of some other time varying quantity, i.e., analogous to another time varying signal.
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Baud
In telecommunication and electronics, baud (symbol: Bd) is a common measure of the speed of communication over a data channel.
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Bell 103 modem
The Bell 103 modem or Bell 103 dataset was the second commercial modem for computers, released by AT&T Corporation in 1962.
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Bell 212A
The Bell 212A modulation scheme defined a standard method of transmitting full-duplex asynchronous serial data at 1.2 kbit/s over analogue transmission lines.
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Bit
The bit (a portmanteau of binary digit) is a basic unit of information used in computing and digital communications.
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Communication protocol
In telecommunication, a communication protocol is a system of rules that allow two or more entities of a communications system to transmit information via any kind of variation of a physical quantity.
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Conexant
Conexant Systems, Inc. was an American-based software developer and fabless semiconductor company.
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Cyclic redundancy check
A cyclic redundancy check (CRC) is an error-detecting code commonly used in digital networks and storage devices to detect accidental changes to raw data.
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D-subminiature
The D-subminiature or D-sub is a common type of electrical connector.
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Data
Data is a set of values of qualitative or quantitative variables.
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Data-rate units
In telecommunications, data-transfer rate is the average number of bits (bitrate), characters or symbols (baudrate), or data blocks per unit time passing through a communication link in a data-transmission system.
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Digital data
Digital data, in information theory and information systems, is the discrete, discontinuous representation of information or works.
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Duplex (telecommunications)
A duplex communication system is a point-to-point system composed of two or more connected parties or devices that can communicate with one another in both directions.
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Fax
Fax (short for facsimile), sometimes called telecopying or telefax (the latter short for telefacsimile), is the telephonic transmission of scanned printed material (both text and images), normally to a telephone number connected to a printer or other output device.
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First-mover advantage
In marketing strategy, first-mover advantage (FMA) is the advantage gained by the initial ("first-moving") significant occupant of a market segment.
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Frequency-shift keying
Frequency-shift keying (FSK) is a frequency modulation scheme in which digital information is transmitted through discrete frequency changes of a carrier signal.
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H.324
H.324 is an ITU-T recommendation for voice, video and data transmission over regular analog phone lines.
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Hayes Microcomputer Products
Hayes Microcomputer Products was a U.S.-based manufacturer of modems.
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Integrated Services Digital Network
Integrated Services Digital Network (ISDN) is a set of communication standards for simultaneous digital transmission of voice, video, data, and other network services over the traditional circuits of the public switched telephone network.
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ITU V.23
The V.23 standard was an early modem standard approved by the ITU in 1988.
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ITU-T
The ITU Telecommunication Standardization Sector (ITU-T) is one of the three sectors (divisions or units) of the International Telecommunication Union (ITU); it coordinates standards for telecommunications.
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Kilobit
The kilobit is a multiple of the unit bit for digital information or computer storage.
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Latin
Latin (Latin: lingua latīna) is a classical language belonging to the Italic branch of the Indo-European languages.
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Link Access Procedure for Modems
Link Access Procedure for Modems (LAPM) is part of the V.42 error correction protocol for modems.
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List of interface bit rates
This is a list of interface bit rates, is a measure of information transfer rates, or digital bandwidth capacity, at which digital interfaces in a computer or network can communicate over various kinds of buses and channels.
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LZ77 and LZ78
LZ77 and LZ78 are the two lossless data compression algorithms published in papers by Abraham Lempel and Jacob Ziv in 1977 and 1978.
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Megabit
The megabit is a multiple of the unit bit for digital information.
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Microcom Networking Protocol
Microcom Networking Protocol (MNP) family of error-correcting protocols were commonly used on early high-speed (2400 bit/s and higher) modems.
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Modem
A modem (modulator–demodulator) is a network hardware device that modulates one or more carrier wave signals to encode digital information for transmission and demodulates signals to decode the transmitted information.
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Modulation
In electronics and telecommunications, modulation is the process of varying one or more properties of a periodic waveform, called the carrier signal, with a modulating signal that typically contains information to be transmitted.
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OSI model
The Open Systems Interconnection model (OSI model) is a conceptual model that characterizes and standardizes the communication functions of a telecommunication or computing system without regard to its underlying internal structure and technology.
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Phase-shift keying
Phase-shift keying (PSK) is a digital modulation process which conveys data by changing (modulating) the phase of a constant frequency reference signal (the carrier wave).
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Plain old telephone service
Plain old telephone service or plain ordinary telephone service (POTS) is a retronym for voice-grade telephone service employing analog signal transmission over copper loops.
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Pulse-code modulation
Pulse-code modulation (PCM) is a method used to digitally represent sampled analog signals.
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Quadrature amplitude modulation
Quadrature amplitude modulation (QAM) is the name of a family of digital modulation methods and a related family of analog modulation methods widely used in modern telecommunications to transmit information.
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RS-232
In telecommunications, RS-232, Recommended Standard 232 is a standard introduced in 1960 for serial communication transmission of data.
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RS-422
RS-422, also known as TIA/EIA-422, is a technical standard originated by the Electronic Industries Alliance that specifies electrical characteristics of a digital signaling circuit.
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RS-423
RS/EIA/TIA-423 is a standard for serial communications.
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Shaping codes
In digital communications shaping codes are a method of encoding that changes the distribution of signals to improve efficiency.
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Symbol rate
In digital communications, symbol rate, also known as baud rate and modulation rate, is the number of symbol changes, waveform changes, or signaling events, across the transmission medium per time unit using a digitally modulated signal or a line code.
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Trellis modulation
In telecommunication, trellis modulation (also known as trellis coded modulation, or simply TCM) is a modulation scheme that transmits information with high efficiency over band-limited channels such as telephone lines.
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USRobotics
U.S. Robotics Corporation, often called USR, is a company that produces USRobotics computer modems and related products.
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V.61
ITU V.61 is a standard for Analog Simultaneous Voice and Data (ASVD), a MODEM related standard for use over a POTS line or leased line.
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V.92
V.92 is an ITU-T recommendation, titled Enhancements to Recommendation V.90, that establishes a modem standard allowing near 56 kb/s download and 48 kb/s upload rates.
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Videotelephony
Videotelephony comprises the technologies for the reception and transmission of audio-video signals by users at different locations, for communication between people in real-time.
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56 kbit/s line
A 56 kbit/s line is a digital connection capable of carrying 56 kilobits per second (kbit/s), or 56,000 bit/s, the data rate of a classical single channel digital telephone line in North America.
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References
[1] https://en.wikipedia.org/wiki/List_of_ITU-T_V-series_recommendations
