The AT&T hierarchy of digital systems that carry signals in digital format. The T-carriers are designated T-1, T-2 and T-4.
A time division, multiplexed digital transmission facility, usually provided by a phone company and operating at an aggregate rate of 1.544 Mbps and above. Series of transmission systems using pulse code modulation technology at various channel capacities and bit rates to send digital information over telephone lines, including optical fiber lines, or another transmission medium
A time-division, pulse-code modulation, voice carrier used on exchange cable to provide short-haul trunks.
General designation of any digital transmission system.
A leased digital line service.
The U.S. standard for digital transmission lines. The line types are of the form T-n, as in T-1 or T-3, and the corresponding line signal standards of the form DS-n, as in DS-1 or DS-4.
A digital medium originally introduced to expand the capabilities of the Bell networks' analog telephone network. T1 lines are very commonly leased to Internet service providers (ISPs) or to businesses because of their capacity of 1.544 Mbps (the equivalent of 24 standard phone lines). T2 lines are capable of carrying 6.312 Mbps (96 standard lines) and T3, 44.736 Mbps (672 lines). Many small enterprises that do not require the full capacity of a T1 are able to lease partial T1 connections to suit their business needs.
A T-Carrier Line is a high-speed leased line for transmitting data and is usually found in corporate environments.
A digital telecommunications system developed by Bell Labs in the 1960s. The most commonly used types of T-carrier connection are T1 and T3 line. T1 lines, which typically carry data at 1.5Mbps (although speeds of 2Mbps are possible), are commonly used by ISPS to supply corporate bandwidth; 45Mbps T3 lines are also in widespread use.
The North American standard of the PDH, a time-division multiplexed, digital transmission system. T-carrier is a PCM system that uses 64Kbps per channel as the basis of the hierarchy. Higher levels reflect aggregation of the 64Kbps channels. T-1 is a 1.544Mbps 24-channel communications circuit; T-2 is a 6.312Mbps 96-channel communications circuit; T-3 is a 44.736Mbps 672-channel communications circuit; T-4 is a 274.176Mbps 4,032-channel communications circuit.
A family of digital trunking methods supported in North America. The European counterpart is E-Carrier. See also E-Carrier.
Generic designator for any of several digitally multiplexed telecommunications carrier systems. TCP/IP: Abbreviation for transmission control protocol/Internet protocol. Two interrelated protocols that are part of the Internet protocol suite. TCP operates on the OSI transport layer and breaks data into packets. IP operates on the OSI network layer and routes packets. Originally developed by the U.S. Department of Defense.
n. A long-distance, digital communications line provided by a common carrier. Multiplexers at either end merge several voice channels and digital data streams for transmission and separate them when received. T-carrier service, introduced by AT&T in 1993, is defined at several capacity levels: T1, T2, T3, T4. In addition to voice communication, T-carriers are used for Internet connectivity. See also T1, T2, T3, T4.
In telecommunications, T-carrier, sometimes abbreviated as T-CXR, is the generic designator for any of several digitally multiplexed telecommunications carrier systems originally developed by Bell Labs and used in North America and Japan.
