Digital switching center long-distance network

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Digital switching center long-distance network ( DIVF ) was the name for the digital switching centers in the long-distance network of Deutsche Telekom's telephone network in the mid-1990s . Until then, the remote level of the network was structured hierarchically. A meshed long-distance network was then set up.

In the classic case, copper cables lead from the termination at the main distributor (HVt) of the local exchange via main cables (HK) to the cable distributor (KVz) in the supply areas. In the street cabinet is from the main cable by means of jumpers on the branch cables ranks . The branch cables run in the ground and are in turn routed into the individual buildings through branches in cable sleeves . Here they end at the termination point of the line network (APL) and are led to the network termination units ( TAE , NTBA , NTPM ). In more and more areas, however, the information data optically in ring networks up to the street cabinet to be VISYON through fiber optic cables transmit.

topology

until the mid-1990s
World level Foreign exchange
Country level DIVF Central exchange Main exchange Node exchange
Local level DIVO Local exchange
today
Foreign exchange unit VE: A (connected to the long-distance network)
Switching unit network transition VE: N (Part of VE: F exchanges)
Switching unit for long-distance traffic VE: F (meshed long-distance network)
Local network switching unit VE: O (connected to the long-distance network)

literature

  • E. Hölzler, H. Holzwarth: Pulse technology. Volume 2, second edition, Springer Verlag, Berlin / Heidelberg 1984, ISBN 978-3-642-88010-0 .
  • Peter R. Gerke: Digital communication networks. Springer Verlag, Berlin / Heidelberg 1991, ISBN 978-3-642-93459-9 .

Web links