VISYON

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VISYON ( Variable Intelligent Synchronous Optical Network ) stands for a project that was introduced by Deutsche Telekom in the German telephone network , in the local network , in the 1990s . Network equipment supplier was mainly ECI Telecom . The concept envisaged a ring structure in the local network, whereby the network elements ADM and Local CrossConnect (LXC) were set up exclusively in the existing operating locations, and existing optical fibers were used. Customers were connected to these network elements with 2 Mbit / s via the copper connection network. Higher bandwidths required a terminal multiplexer at the customer, which could only be implemented via a fiber optic connection. At the LXC there was a transition to the wide area network (backbone), which was also set up in an SDH ring structure. The technology was based on the first standards of the synchronous digital hierarchy . However, a double ring was largely dispensed with, the customer connections were protected against failures by means of SNCP .

The system was replaced by a newer SDH network that is available across Germany in 2 network levels (region / backbone).

literature

  • Volker Jung, Hans-Jürgen Warnecke (Hrsg.): Handbook for telecommunications. Springer Verlag, Berlin / Heidelberg 1998, ISBN 978-3-642-97703-9 , pp. 4-48.
  • Dieter Opielka, Wolfgang Schneider (ed.): Optical communications technology. Basics and applications, Friedrich Vieweg & Sohn Verlag, Wiesbaden 1995, ISBN 978-3-528-04946-1 .

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