A T-interface or T reference point is used for basic rate access in an

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 digitalised circuits of the public switched telephone network. Work ...

(ISDN) environment. It is a User–network interface reference point that is characterized by a four-wire, 144 kbit/s (2B+D) user rate. Other characteristics of a T-interface are: * it accommodates the link access and

transport layer In computer networking, the transport layer is a conceptual division of methods in the layered architecture of protocols in the network stack in the Internet protocol suite and the OSI model. The protocols of this layer provide end-to-end ...

function in the ISDN architecture * it is located at the user premises * it is distance sensitive to the servicing Network termination 1 * it functions in a manner similar to that of the

Channel service unit In telecommunications, a channel service unit (CSU) is a line bridging device for use with T-carrier, which *is used to perform loopback testing; *may perform bit stuffing; *may also provide a framing and formatting pattern compatible with th ...

s (CSUs) and the

Data service unit A data service unit, sometimes called a digital service unit, is a piece of telecommunications circuit terminating equipment that transforms digital data between telephone company lines and local equipment. The device converts bipolar digital sign ...

s (DSUs). The T interface is electrically equivalent to the S interface, and the two are jointly referred to as the S/T interface.

References

Networking hardware Integrated Services Digital Network {{compu-hardware-stub

See also

References