In this article we will discuss T-carrier, will make brief discussion on T-carrier, last article we discuss about E-carrier.

T-carrier 1 (digital transmission line, 1.544 Mbps, 24 voice channels). A digital transmission service from a common carrier. Although developed in the 1960s and used internally, AT&T introduced it as a communications product to the public in 1983.

The Tcarriers are commonly used for trunking between switching centers in a telephone network, including to private branch exchange (PBX) interconnect points. A T1 trunk could transmit 24 telephone calls at a time, because it used a digitalcarrier signal called Digital Signal 1 (DS-1).

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.

If your office has a T1 line, it means that the phone company has brought a fiber optic line into your office (a T1 line might also come in on copper). A T1 line can carry 24 digitized voice channels, or it can carry data at a rate of 1.544 megabits per second.

The T-carrier system is entirely digital, using pulse code modulation (PCM) and time-division multiplexing (TDM). The system uses four wires and provides duplex capability (two wires for receiving and two for sending at the same time). The T1digital stream consists of 24 64-Kbps channels that are multiplexed.

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