T-carrier systems - définition. Qu'est-ce que T-carrier systems
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Qu'est-ce (qui) est T-carrier systems - définition

A MEMBER OF THE SERIES OF CARRIER SYSTEMS DEVELOPED BY AT&T BELL LABORATORIES FOR DIGITAL TRANSMISSION OF MULTIPLEXED TELEPHONE CALLS.
T1 rate; T-carrier system; T3 (protocol); T carrier; T-CXR; T1 Transmission System; Transmission System 1
  • Left: A [[66 block]]; center and right: Cabinets containing [[Smartjack]] [[network interface device]]s for T1 circuits.

T-carrier system         
<communications> A series of wideband digital data transmission formats originally developed by the Bell System and used in North America and Japan. The basic unit of the T-carrier system is the DS0, which has a transmission rate of 64 Kbps, and is commonly used for one voice circuit. Originally the 1.544 megabit per second T1 format carried 24 pulse-code modulated, time-division multiplexed speech signals each encoded in 64 kilobit per second streams, leaving 8 kilobits per second of framing information which facilitates the synchronisation and demultiplexing at the receiver. T2 and T3 circuits channels carry multiple T1 channels multiplexed, resulting in transmission rates of up to 44.736 Mbps. The T-carrier system uses in-band signaling, resulting in lower transmission rates than the E-carrier system. It uses a restored polar signal with 303-type data stations. Asynchronous signals can be transmitted via a standard which encodes each change of level into three bits; two which indicate the time (within the current synchronous frame) at which the transition occurred, and the third which indicates the direction of the transition. Although wasteful of line bandwidth, such use is usually only over small distances. T1 lines are made free of direct current signal components by in effect capacitor coupling the signal at the transmitter and restoring that lost component with a "slicer" at the receiver, leading to the description "restored polar". [Telecommunications Transmission Engineering, Vol. 2, Facilities, AT&T, 1977]. (2001-04-08)
common carrier         
PROFESSION
Common carriers; Common Carrier; Carrying for hire; Common carriage; Common carrier obligation; Common-carrier; Residual common carrier obligation; Public carrier; Motor carrier (designation)
<communications, company> (Or "phone company") A private company that offers telecommunications services to the public. (1995-03-20)
common carrier         
PROFESSION
Common carriers; Common Carrier; Carrying for hire; Common carriage; Common carrier obligation; Common-carrier; Residual common carrier obligation; Public carrier; Motor carrier (designation)
¦ noun
1. a person or company undertaking to transport any goods or passengers on regular routes at agreed rates.
2. N. Amer. a company providing public telecommunications facilities.

Wikipédia

T-carrier

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.

The first version, the Transmission System 1 (T1), was introduced in 1962 in the Bell System, and could transmit up to 24 telephone calls simultaneously over a single transmission line of copper wire. Subsequent specifications carried multiples of the basic T1 (1.544 Mbit/s) data rates, such as T2 (6.312 Mbit/s) with 96 channels, T3 (44.736 Mbit/s) with 672 channels, and others.

Although a T2 was defined as part of AT&T's T-carrier system, which defined five levels, T1 through T5, only the T1 and T3 were commonly in use.