Remote peripheral unit

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A remote peripheral unit ( APE ) is an upstream part of a switching center that is remote from it and connected by cable . In Europe, this connection is usually made via HDB3 -coded 2 Mbit / s lines (E1). In the case of the EWSD switching system , an APE essentially consists of the Digital Line Units (DLU), to which the subscribers are connected, and a Line Trunk Group (LTG).

An APE has a concentrator function and is used to connect terminal equipment via a smaller number of lines than would be required if the terminal equipment was connected directly. In addition, the number of independent switching centers or switching areas can be reduced. This reduces the investment and administration costs, as an APE does not have its own "intelligence". The higher-level exchange, the so-called "parent exchange", is responsible for control and coordination.

The need to use APE also arises from the fact that the connection line from the switching device to the subscriber cannot be of any length. Loop resistance and damping set physical limits. With the APE, the supply area of ​​a local network is enlarged by a further connection area with comparatively little effort .

literature

  • Volker Jung, Hans-Jürgen Warnecke (Hrsg.): Handbook for telecommunications. Springer Verlag, Berlin / Heidelberg 1998, ISBN 978-3-642-97703-9 .