T-interface
Encyclopedia
A T-interface is used for basic rate access in an Integrated Services Digital Network
(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:
Integrated Services Digital Network
Integrated Services Digital Network is a set of communications standards for simultaneous digital transmission of voice, video, data, and other network services over the traditional circuits of the public switched telephone network...
(ISDN) environment. It is a User–network interface reference point that is characterized by a four-wire, 144 kbit
Kilobit
The kilobit is a multiple of the unit bit for digital information or computer storage. The prefix kilo is defined in the International System of Units as a multiplier of 103 , and therefore,...
/s (2B+D) user rate.
Other characteristics of a T-interface are:
- it accommodates the link access and transport layerTransport layerIn computer networking, the transport layer or layer 4 provides end-to-end communication services for applications within a layered architecture of network components and protocols...
function in the ISDN architecture - it is located at the user premises
- it is distance sensitive to the servicing Network termination 1Network termination 1Network Termination 1 : In Integrated Services Digital Networks , a functional grouping of customer-premises equipment that includes functions that may be regarded as belonging to OSI Layer 1, i.e., functions associated with ISDN electrical and physical terminations on the user premises.Note: The...
- it functions in a manner similar to that of the Channel service unitChannel service unitIn telecommunications, a channel service unit is a line bridging device for use with T-carrier that:*is used to perform loopback testing,*may perform bit stuffing,*may also provide a framing and formatting pattern compatible with the network,...
s (CSUs) and the Data service unitData service unitA 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 signals coming ultimately from a digital circuit and...
s (DSUs).