57 relations: Alarm indication signal, Automatic number identification, Bandwidth (computing), Bell Labs, Bipolar encoding, Bit, Bit rate, Bitstream, Broadcast programming, Byte (magazine), Caller ID, Canada, Carrier system, Carrier wave, Central office multiplexing, Code, Communication channel, Communication protocol, Dark fibre, Data link layer, Data-rate units, Dialed Number Identification Service, Digital Signal 0, Digital Signal 1, Digital Signal 3, DS4/NA, Duplex (telecommunications), E-carrier, Ethernet, Extended superframe, Frame synchronization, Gigabit Ethernet, Hertz, Institute of Electrical and Electronics Engineers, Japan, Jitter, Line code, Line signaling, Mainframe computer, Modified AMI code, Multiplexing, Optical fiber, Overhead information, Primary Rate Interface, Pulse-code modulation, Robbed-bit signaling, Self-healing ring, Superframe, Synchronization, Synchronous optical networking, ..., T-carrier, Telecommunication circuit, Time-division multiplexing, United States, Wavelength-division multiplexing, Wide area network, 10 Gigabit Ethernet. Expand index (7 more) » « Shrink index
Alarm indication signal (AIS) (also called “all ones” because of the data and framing pattern) is a signal transmitted by an intermediate element of a multi-node transport circuit that is part of a concatenated telecommunications system to alert the receiving end of the circuit that a segment of the end-to-end link has failed at a logical or physical level, even if the system it is directly connected to is still working.
Automatic number identification (ANI) is a feature of a telecommunications network for automatically determining the origination telephone number on toll calls for billing purposes.
In computing, bandwidth is the maximum rate of data transfer across a given path.
Nokia Bell Labs (formerly named AT&T Bell Laboratories, Bell Telephone Laboratories and Bell Labs) is an American research and scientific development company, owned by Finnish company Nokia.
In telecommunication, bipolar encoding is a type of return-to-zero (RZ) line code, where two nonzero values are used, so that the three values are +, −, and zero.
The bit (a portmanteau of binary digit) is a basic unit of information used in computing and digital communications.
In telecommunications and computing, bit rate (bitrate or as a variable R) is the number of bits that are conveyed or processed per unit of time.
A bitstream (or bit stream), also known as binary sequence, is a sequence of bits.
Broadcast programming is the practice of organizing and/or ordering of broadcast media programs (Internet, television, radio, etc.) in a daily, weekly, monthly, quarterly or season-long schedule.
Byte was an American microcomputer magazine, influential in the late 1970s and throughout the 1980s because of its wide-ranging editorial coverage.
Caller ID (caller identification, CID), also called calling line identification (CLID), Calling Line Identification (CLI), calling number delivery (CND), calling number identification (CNID), calling line identification presentation (CLIP), or call display, is a telephone service, available in analog and digital telephone systems, including VoIP, that transmits a caller's telephone number to the called party's telephone equipment when the call is being set up.
Canada is a country located in the northern part of North America.
A carrier system is a telecommunications system that transmits information, such as the voice signals of a telephone call and the video signals of television, by modulation of one or multiple carrier signals above the principal voice frequency or data rate.
In telecommunications, a carrier wave, carrier signal, or just carrier, is a waveform (usually sinusoidal) that is modulated (modified) with an input signal for the purpose of conveying information.
Central office multiplexing (or CO muxing) is telephone exchange (central office) equipment that derives a number of lower speed channels from one high-bandwidth channel.
In communications and information processing, code is a system of rules to convert information—such as a letter, word, sound, image, or gesture—into another form or representation, sometimes shortened or secret, for communication through a communication channel or storage in a storage medium.
A communication channel or simply channel refers either to a physical transmission medium such as a wire, or to a logical connection over a multiplexed medium such as a radio channel in telecommunications and computer networking.
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.
A dark fibre or unlit fibre is an unused optical fibre, available for use in fibre-optic communication.
The data link layer, or layer 2, is the second layer of the seven-layer OSI model of computer networking.
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.
Dialed Number Identification Service (DNIS) is a service sold by telecommunications companies to corporate clients that lets them determine which telephone number was dialed by a customer.
Digital Signal 0 (DS0) is a basic digital signaling rate of 64 kilobits per second (kbit/s), corresponding to the capacity of one analog voice-frequency-equivalent communication channel.
Digital Signal 1 (DS1, sometimes DS-1) is a T-carrier signaling scheme devised by Bell Labs.
A Digital Signal 3 (DS3) is a digital signal level 3 T-carrier.
The Digital Signal 4/NA (DS4/NA) is a 139.264-Mbit/s aggregate-multiplexed signal, equivalent to 3 Digital Signal 3s or 2,016 Digital Signal 0s.
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.
The E-carrier is a member of the series of carrier systems developed for digital transmission of many simultaneous telephone calls by time-division multiplexing.
Ethernet is a family of computer networking technologies commonly used in local area networks (LAN), metropolitan area networks (MAN) and wide area networks (WAN).
In telecommunications, extended superframe (ESF) is a T1 framing standard.
In telecommunication, frame synchronization or framing is the process by which, while receiving a stream of framed data, incoming frame alignment signals (i.e., a distinctive bit sequences or syncwords) are identified (that is, distinguished from data bits), permitting the data bits within the frame to be extracted for decoding or retransmission.
In computer networking, Gigabit Ethernet (GbE or 1 GigE) is a term describing various technologies for transmitting Ethernet frames at a rate of a gigabit per second (1,000,000,000 bits per second), as defined by the IEEE 802.3-2008 standard.
The hertz (symbol: Hz) is the derived unit of frequency in the International System of Units (SI) and is defined as one cycle per second.
The Institute of Electrical and Electronics Engineers (IEEE) is a professional association with its corporate office in New York City and its operations center in Piscataway, New Jersey.
Japan (日本; Nippon or Nihon; formally 日本国 or Nihon-koku, lit. "State of Japan") is a sovereign island country in East Asia.
In electronics and telecommunications, jitter is the deviation from true periodicity of a presumably periodic signal, often in relation to a reference clock signal.
Some signals are more prone to error than others when conveyed over a communication channel as the physics of the communication or storage medium constrains the repertoire of signals that can be used reliably.
Line signaling is a class of telecommunications signaling protocols.
Mainframe computers (colloquially referred to as "big iron") are computers used primarily by large organizations for critical applications; bulk data processing, such as census, industry and consumer statistics, enterprise resource planning; and transaction processing.
Modified AMI codes are a digital telecommunications technique to maintain system synchronization.
In telecommunications and computer networks, multiplexing (sometimes contracted to muxing) is a method by which multiple analog or digital signals are combined into one signal over a shared medium.
An optical fiber or optical fibre is a flexible, transparent fiber made by drawing glass (silica) or plastic to a diameter slightly thicker than that of a human hair.
Overhead information is digital information transferred across the functional interface between a user and a telecommunications system, or between functional units within a telecommunications system, for the purpose of directing or controlling the transfer of user information or the detection and correction of errors.
The Primary Rate Interface (PRI) is a telecommunications interface standard used on an Integrated Services Digital Network (ISDN) for carrying multiple DS0 voice and data transmissions between the network and a user.
Pulse-code modulation (PCM) is a method used to digitally represent sampled analog signals.
In communication systems, robbed-bit signaling is a scheme to provide maintenance and line signaling services on many T1 digital carrier circuits using channel-associated signaling (CAS).
A self-healing ring, or SHR, is a telecommunications term for loop network topology, a common configuration in telecommunications transmission systems.
In telecommunications, superframe (SF) is a T1 framing standard.
Synchronization is the coordination of events to operate a system in unison.
Synchronous optical networking (SONET) and synchronous digital hierarchy (SDH) are standardized protocols that transfer multiple digital bit streams synchronously over optical fiber using lasers or highly coherent light from light-emitting diodes (LEDs).
The T-carrier is a member of the series of carrier systems developed by AT&T Bell Laboratories for digital transmission of multiplexed telephone calls.
A telecommunication circuit is any line, conductor, or other conduit by which information is transmitted.
Time-division multiplexing (TDM) is a method of transmitting and receiving independent signals over a common signal path by means of synchronized switches at each end of the transmission line so that each signal appears on the line only a fraction of time in an alternating pattern.
The United States of America (USA), commonly known as the United States (U.S.) or America, is a federal republic composed of 50 states, a federal district, five major self-governing territories, and various possessions.
In fiber-optic communications, wavelength-division multiplexing (WDM) is a technology which multiplexes a number of optical carrier signals onto a single optical fiber by using different wavelengths (i.e., colors) of laser light.
A wide area network (WAN) is a telecommunications network or computer network that extends over a large geographical distance/place.
10 Gigabit Ethernet (10GE, 10GbE, or 10 GigE) is a group of computer networking technologies for transmitting Ethernet frames at a rate of 10 gigabits per second.