Circuitry for a digital telephone subscriber stati

专利名称：Circuitry for a digital telephone subscriber

station

发明人：KESSLER, ARTHUR, (ING. GRAD.),LOTZSCH,

JURGEN, DIPL.-ING.

申请号：EP80101961.3申请日：19800411公开号：EP0018525A1公开日：19801112

专利附图：

摘要：1. Circuit arrangement for the connection of additional equipment to a digitaltelephone station (DT) with units (codecs) for the conversion of the voice information in

analog signals and vice versa, which are transmitted full duplex via a two wire remotelyfed individual subscriber's line (TAL) and with a first line circuit (L1) as interface to thesubscriber's line (TAL), whereby the information arriving at the line circuit is forwarded toan interface for the connection of additional equipment and the information arriving fromthe additional equipment is forwarded to the subscriber's line, comprising a secondinterface (L2) having a line circuit for the connection of additional equipment, which isidentical with the first line circuit (L1) for the subscriber's line (TAL), whereby theinformation arriving on the subscriber's line (TAL) and appearing at the terminals (a/b) isforwarded to the terminals (a'/b') of the second line circuit (L2), with these terminals aninternal line (JAL) for the connection of additional equipment of the digital telephonestation (DT) can be connected, the information transmitted from the additional

equipment via the internal line (JAL) appearing at the terminals (a'/b') of the second linecircuit (L2) is also retransmitted via a processor (VE) to the terminals (a/b) of the first linecircuit, whereby the processor (VE), which is used for receiving, evaluation and generationof the received information and the information to be transmitted (for example speechinformation, signalling, addressing), prevents the retransmission of information, which isexclusively used on the internal line (JAL).

申请人：TELEFONBAU UND NORMALZEIT GMBH

地址：Mainzer Landstrasse 128-146 Postfach 4432 D-6000 Frankfurt (Main) DE

国籍：DE

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