Digital line unit

The Digital Line Unit ( DLU ) is a component for connecting analog and ISDN subscribers to the digital electronic dialing system EWSD . Similar to a remote peripheral unit (APE), this itself can only perform switching functions close to the subscriber and must be connected to a switching center. It has its own electronic control, which is available twice for safety reasons and also for load sharing. It is connected to the exchange with two or four primary multiplex lines via the Line Trunk Group (LTG) component . The LTG controls the DLU via the company's own network protocol V93. Components of the access network that can be connected to an LTG as an alternative to a DLU are connected to the LTG via the V5 interface .

literature

• Peter R. Gerke: Digital communication networks. Springer Verlag, Berlin / Heidelberg 1991, ISBN 978-3-642-93459-9 .
• Bernard E. Keizer, Eugene Strange: Digital Telephony and Network Integration. Springer Science + Business Media, New York 1995, ISBN 978-1-4613-5721-6 .
• Peter Bocker: ISDN - the integrated services digital message network. Third edition, Springer Verlag, Berlin / Heidelberg 1990, ISBN 978-3-662-08031-3 .
• Volker Jung, Hans-Jürgen Warnecke (Hrsg.): Handbook for telecommunications. Springer Verlag, Berlin / Heidelberg 1998, ISBN 978-3-642-97703-9 .

Web links

• Paths to the NGN future (accessed on June 9, 2017)
• Digital line unit for connecting subscriber terminals to a digital switching exchange (accessed June 9, 2017)
• Data transmission in the analog telephone network (accessed on June 9, 2017)
• Digital switching center (EWSD) (accessed on June 9, 2017)
• Connection and distribution systems (accessed on June 9, 2017)