A T-interface or T reference point is used for
basic rate access
Basic Rate Interface (BRI, 2B+D, 2B1D) or Basic Rate Access is an Integrated Services Digital Network (ISDN) configuration intended primarily for use in subscriber lines similar to those that have long been used for Plain old telephone service, v ...
in an
Integrated Services Digital 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
Reference point or similar may refer to:
Mathematics and science
* Reference point (physics), used to define a frame of reference
*Reference point, a point within a reference range or reference interval, which is a range of values found in healthy ...
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 Network Termination 1 (NT1) or Network Termination type 1 refers to equipment in an Integrated Services Digital Network (ISDN) that physically and electrically terminates the network at the customer's premises. The NT1 network termination provides ...
* 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 the n ...
s (CSUs) and the
Data service units (DSUs).
The T interface is electrically equivalent to the
S interface
The S interface or S reference point, also known as S0, is a user–network interface reference point in an ISDN BRI environment, characterized by a four-wire circuit using 144kbit/s (2 bearer and 1 signaling channel; 2B+D) user rate.
The S i ...
, and the two are jointly referred to as the S/T interface.
See also
*
R interface
R interface or R reference point defines the point between a non-ISDN device and a terminal adapter (TA) which provides translation to and from such a device.
See also
* S interface
* T interface
* U interface
U or u, is the twenty-first ...
*
S interface
The S interface or S reference point, also known as S0, is a user–network interface reference point in an ISDN BRI environment, characterized by a four-wire circuit using 144kbit/s (2 bearer and 1 signaling channel; 2B+D) user rate.
The S i ...
*
U interface
U or u, is the twenty-first and sixth-to-last letter and fifth vowel letter of the Latin alphabet, used in the modern English alphabet, the alphabets of other western European languages and others worldwide. Its name in English is ''u'' (pro ...
References
Networking hardware
Integrated Services Digital Network
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