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. ...
(ISDN) environment. It is a
User–network interface In telecommunications, a user–network interface (UNI) is a demarcation point between the responsibility of the service provider and the responsibility of the subscriber. This is distinct from a network-to-network interface (NNI) that defines a si ...
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 c ...
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 units (CSUs) and the
Data service units (DSUs).
The T interface is electrically equivalent to the
S interface, and the two are jointly referred to as the S/T interface.
See also
*
R interface
*
S interface
*
U interface
The U interface or U reference point is a Basic Rate Interface (BRI) in the local loop of an Integrated Services Digital Network (ISDN), connecting the network terminator (NT1/2) on the customer's premises to the line termination (LT) in the car ...
References
Networking hardware
Integrated Services Digital Network
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