Digital switching center long-distance network
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
- Public networks and services (accessed June 12, 2017)
- Examples of telecommunications systems (accessed on June 12, 2017)
- Communication networks (accessed June 12, 2017)
- The Infrastructure of the Information Society (accessed June 12, 2017)
- The telephone, its networks and their influence on everyday private life (accessed June 12, 2017)