U interface
In the ISDN access network, the U interface is the interface on the subscriber line between the local exchange and the network termination . The designation with "U" comes from the ISDN reference model, in which there are the reference points S, T, U and V and corresponding interface definitions.
While U K0 is the designation for this interface on the basic access , U K2 and U G2 are those of the primary rate access .
The U-ADSL interface is used to connect ADSL modems. It is the interface between the local exchange and the splitter .
Analogous to this form of designation, the extension technology has chosen similar designations for corresponding interfaces, albeit in a different technology, for example U p0 and U pN .
For the U interface, standardized physical and electrical specifications apply throughout Europe, so that it is possible to connect network terminations (NT) from different manufacturers. With ADSL However, this is not (yet) the case, the U-ADSL specification of Deutsche Telekom , although generally accessible, but is only valid in Germany.
literature
- Werner Bärwald: Expert practice lexicon communication technologies. Networks - Services - Applications, Expert Verlag, Renningen 2009, ISBN 978-3-8169-2843-0 .
- Hubert Zitt: ISDN & DSL for PC and telephone. Verlag Markt + Technik, Munich 2005, ISBN 3-8272-6987-3 .
- Rudolf Nocker: Digital Communication Systems 2nd 1st edition, Friedrich Vieweg & Sohn Verlag, Wiesbaden 2005, ISBN 978-3-528-03977-6 .
- Firoz Kaderali: Digital Communication Technology II. Friedrich Vieweg & Sohn Verlagsgesellschaft mbH, Braunschweig 1995, ISBN 978-3-528-06485-3 .