Siemens Aktiengesellschaft

Hans-Werner Rudolf

Robert Lechner

Harald Stader

Norbert Wingerath

Roland Krimmer

Nigel P Dyer

Thomas Ahrndt

Pierre Albouy

Virgilio Mosca

Robert K Galpin

Karl Kloppe

Ramatchandirane Nadaradjane

Robert Le Gougnec

Ira Hilscher

Christopher C Priest

Martin Braun

Marcello Manca

Stephan Binde

Antonio Nicastro

Werner Nagler

Monika Stadler

For modem connections via telephone lines, modems that respectively correspond to the modems of the terminal equipment side are arranged in the subscriber line circuits of the telephone switching centers as close as possible to the entry point of the subscriber line circuits. Modem communication only respectively between these pairs.

Arrangement for data transmission utilizing telephone network

A circuit arrangement for a subscriber-remote termination of a subscriber line, high-bit rate data signals and analog telephone signals. The arrangement integrates exchange-side devices, a splitter and a modem into a subscriber line circuit for the subscriber line. Additionally, the exchange-side devices, splitter and modem may be protected from overvoltages by an overvoltage protection circuit contained within the subscriber line circuit.

Circuit arrangement for the subscriber-remote termination of a

Given the prerequisite of a division of a subscriber line circuit into a high-voltage portion and a signal processor that defines the transmission-oriented properties, voltages arising at significant locations of the receiving branch and of the transmitting branch of the signal processor as a result of supplied and reflected sine signals are taken via a digital interface and specific transmission properties such as reflection attenuation and hybrid transfer attenuation are calculated therefrom on the basis of a correlation.

Method for checking transmission properties of a subscriber line circuit

A harmonic tone having an amplitude which is significantly lower than a fundamental audible tone is superimprosed on the audible tone to drown out quantization noises for audible tones transmitted in digital telecommunications exchange systems.

Method for suppressing quantization noises superimposed on a sinusoidal

A digital interface between at least two subscriber line interface circuits and a processing unit is described. The interface is configured in the form of a parallel interface. The level of an input/output register and of a control register is allocated, as needed, to the connections of the processing unit. These connections can be operated selectively as inputs or outputs. They can also be operated in two modes, depending upon which type of subscriber line interface circuit (SLIC) is connected. The connections of the last-mentioned units are partially operable as inputs or outputs and partially operable only as inputs but in the input case, selectively for various types of input signals.

Digital interface between at least two subscriber line interface

A digital interface of an integrated subscriber line interface circuit is provided. The interface serves for the connection of a signal processor unit. Individual connections are used as signal inputs in signal entry operation of the interface, and as signal outputs in signal transmission operation. Other connections are used as signal inputs in both operating mode, but receive different signals in each operating mode. One group of connections includes two registers with respective associated decoders to enable switching from one to the other, so that the number of operating instructions that can be represented by means of binary signal value combinations applied to the connections is doubled.

Digital interface of an integrated subscriber line interface circuit

In a subscriber termination module for coupling a plurality of subscriber termination lines of a digital time multiplex telecommunications network, lines coupling a central portion and local portions individually allocated to at least one subscriber termination line are selectably utilized for the transmission of status setting information to the local portions for setting different operating conditions and for serial transmission, that is, successive transmission of information to be supplied to the individual local portions as well as for simultaneous information transmission from the local portions to the central portion, that is, parallel information transmission.

Method for the operation of an interface circuit between a central

The invention describes a protective circuit for the protection of the electronic interconnect circuit (SLIC) and the electronic switches for test access, by means of a threshold setting element which is provided for each conductor (a,b) of a core pair for the shunting of overvoltages to ground, as well as a current path of higher breakover voltage for each conductor of the core pair, which permits checking the subscriber line circuit for line interruption during a malfunction of the threshold setting element.

Protective circuit for the overvoltage protection of a subscriber line

A protective circuit for the electronic interface circuit (SLIC) as well as the electronic switches for test access is described, in which a first threshold setting element for each conductor of the core pair is connected between the line side and a test access and/or isolation switch and the test access switch for the related first conductor of the core pair, for conducting overvoltages to ground, as well as a second threshold setting element bridging access switch which is connected to ground via a third threshold setting element.

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Munich, Germany

Hans-Werner Rudolf