Local network
A local area network in a telephone network describes a part of the access network that is geographically limited to one or more localities . In countries without national number portability of the subscriber numbers (as in Germany), a local area network comprises all connections that can be reached under the same area code . The boundaries of a local network are generally based on the political city and municipality boundaries that were current at the time the telephone network was established.
A local network consists of:
- a remote peripheral unit (APE) or (in medium-sized locations) a local exchange (OVSt) or (in large locations) an OVSt with several APEs. Each of these facilities is housed in a main distribution center and supplies its own connection area .
- the associated "apron facilities", such as cable distributors and terminal distributors
- the participating institutions
- the lines between these components ( subscriber line )
Small towns usually do not have their own local exchange, but are connected to the next via local cables . The connection is relatively seldom made analog in the low frequency range. Most are remote peripheral units of the nearest local exchange used, the voice channels in PCM - multiplex technology transfer.
As a rule, a local network area covers the areas with a radius of approx. 5 km around the main distributor. There are 5200 local networks in Germany.
The exchanges of different local networks can be connected (meshed ) to one another via local connection lines (OVl) , via which so-called cross traffic takes place between the local networks connected in this way. In digital technology, however, these are no longer bundles of lines, but also PCM multiplex routes.
In Germany, the area code 0621 is the only one that refers to two separate local networks: Ludwigshafen am Rhein and Mannheim .
literature
- Martin Sonnenschein, Arne Börnsen, Tilo Ferrari, Arne Dettki, Axel Freyberg: Innovative Regulation. Opportunities for telecommunications and media in Germany, Verlag Dr. Th. Gabler GmbH, Wiesbaden 2003, ISBN 978-3-322-82456-1 .
- Wolfgang Burr: Innovations in Organizations. 2nd expanded and updated edition, Kohlhammer GmbH, Stuttgart 2017, ISBN 978-3-17-031180-0 .
- Cornelius Graack: Telecommunications Industry in the European Union. Springer Verlag, Berlin / Heidelberg 1997, ISBN 978-3-7908-1037-0 .
- Arno Polzin. Be brief! The cross-border telephone traffic of the opposition in the 1980s and the Ministry for State Security, Vandenhoeck & Ruprecht GmbH & Co KG, Göttingen 2014, ISBN 978-3-5253-5115-4 .
- Wilfried Plaßmann, Detlef Schulz (Hrsg.): Handbook of electrical engineering. 5th edition, Vieweg & Teubner Verlag, Wiesbaden 2009, ISBN 978-3-8348-0470-9 .
