Central Office
![](https://upload.wikimedia.org/wikipedia/commons/thumb/1/16/Central_office_DMK.jpg/220px-Central_office_DMK.jpg)
Central Office or CO for short is a term borrowed from English for an exchange or a PoP . The term CO is often used in the DSL context. Subscriber lines that connect the subscriber terminal equipment to the exchange converge in such a CO . There they are switched to the telephone network and / or to a DSLAM / DSL-AC , depending on the order .
In order to enable short subscriber connection lines, these central exchanges have generally no longer been connected directly to subscriber terminal equipment for many years, but predominantly via fiber optic lines (formerly with copper lines) with a large number of local exchanges . These devices can be found in control cabinets at the roadside or underground or in buildings. The subscriber terminal is then connected to the nearest local exchange. The English-language name for this is Local Office or LO for short . From the perspective of the subscriber terminal, there is no difference between CO and LO.
literature
- Volker Jung, Hans-Jürgen Warnecke (Hrsg.): Handbook for telecommunications. Springer Verlag, Berlin / Heidelberg 1998, ISBN 978-3-642-97703-9 .
- Christoph Meinel, Harald Sack: Internetworking. Springer Verlag, Berlin / Heidelberg 2012, ISBN 978-3-540-92939-0 .
- Wendell Odom: CCEN-CCNA-ICND1 Examination Guide. 2nd edition, Markt & Technik Verlag, Munich 2008, ISBN 978-3-8273-2634-8 .
See also
- Point of Presence
- Customer Premises Equipment (CPE)
- Central Office Equipment (COE)
- Collocation (telecommunications) , colocation
- Exchange
- Connection area
- Main distributor
Web links
- Fiber Optic Network Solutions - FTTH (accessed June 2, 2017)
- Broadband initiative of the Free State of Thuringia (accessed June 2, 2017)
- Fixed line architecture (accessed June 2, 2017)