Abstract: A transmission apparatus for line signals is provided having a line device for transmitting the line signals at prescribed signal levels and having a line driver device which has an amplifier unit and a control unit. A determination unit is used to change over the operating mode of the amplifier unit when a signal level for the line signals exceeds a prescribed reference level by virtue of a determination unit having established that a prescribed reference signal level has been exceeded by the signal level of the line signals.

Abstract: A voltage protection circuit for a terminal of an electronic device, for example the TIP and RING lines of a linecard, is provided. The voltage protection circuit comprises a protection element, a first terminal of which is coupled to the terminal of the electronic device, a second terminal of which is coupled to a ground potential and a control terminal of which is coupled to a reference voltage element, the protection element having a low resistance between its first and second terminals when the control terminal is in a first state and a higher resistance between its first and second terminals when the control terminal is in a second state, the reference voltage element being further coupled to a reference voltage and being adapted such that the state of the control terminal depends on an applied voltage at the first terminal and the reference voltage.

Abstract: The invention provides a transmission apparatus for line signals (206a, 206b) having a line device (201) for transmitting the line signals (206a, 206b) at prescribed signal levels and having a line driver device (100) which has an amplifier unit (101) and a control unit (105). A determination unit (102) is used to change over the operating mode of the amplifier unit (101) when a signal level for the line signals (206a, 206b) exceeds a prescribed reference level (113a, 113b) by virtue of a determination unit (102) having established that a prescribed reference signal level (113a, 113b) has been exceeded by the signal level of the line signals (206a, 206b).

Abstract: The communications system has a transmission network for transmitting useful data and control data. Call numbers are input at a subscriber terminal. A subscriber line unit with an adjustable transmission characteristic is connected between the subscriber terminal and the transmission network. A recognition unit connected to the transmission network recognizes particular call number patterns and outputs particular control signals corresponding to call number patterns. A control unit connected between the recognition unit and the subscriber line unit sets the transmission characteristic of the subscriber line unit depending on the control signals provided by the recognition unit.

Abstract: A comb filter arrangement has an integrator that outputs an input value to a signal path. The signal path includes a delay stage for adjusting the input value using a delay factor, a decimator that converts the input value into a decimated output value using a non-integral factor, a differentiator that generates an intermediate output value from the input value, and an interpolation arrangement that receives the intermediate output value and generates a decimated sequence of the output value.

Abstract: A voltage protection circuit for a terminal of an electronic device, for example the TIP and RING lines of a linecard, is provided. The voltage protection circuit comprises a protection element, a first terminal of which is coupled to the terminal of the electronic device, a second terminal of which is coupled to a ground potential and a control terminal of which is coupled to a reference voltage element, the protection element having a low resistance between its first and second terminals when the control terminal is in a first state and a higher resistance between its first and second terminals when the control terminal is in a second state, the reference voltage element being further coupled to a reference voltage and being adapted such that the state of the control terminal depends on an applied voltage at the first terminal and the reference voltage.

Abstract: Switchable POTS-splitter for separating a voice signal from a data signal having a high pass filter for the data signal and a low pass filter for the voice signal and for a ringing signal which is generated by a ringing signal generator of a central office and switched by means of a signal feeding switch to the low pass filter for a transmission to a remote transmission unit via a ring line, wherein the low pass filter comprises at least one capacitor and a corresponding capacitor switch for switching said capacitor to the ring line when the ringing signal is transmitted.

Abstract: Switchable POTS-splitter for separating a voice signal from a data signal having a high pass filter for the data signal and a low pass filter for the voice signal and for a ringing signal which is generated by a ringing signal generator of a central office and switched by means of a signal feeding switch to the low pass filter for a transmission to a remote transmission unit via a ring line, wherein the low pass filter comprises at least one capacitor and a corresponding capacitor switch for switching said capacitor to the ring line when the ringing signal is transmitted.

Abstract: A circuit configuration for line adaptation and echo suppression includes a balance filter which is triggered by transmission signals and supplies output signals that are linked through a subtractor to a reception signal. An impedance adaptation filter is triggered by the reception signal and supplies an output signal that is linked through an adder to the transmission signal. An analog/digital converter converts analog reception signals into digital reception signals. A digital/analog converter converts digital transmission signals into analog transmission signals. The impedance adaptation filter processes digital signals and the balance filter processes analog signals.

Abstract: A processor circuit configuration with a control processor and circuit blocks which are connected to the control processor through a bus. A testing device includes test decoders which are each assigned to a respective one of the circuit blocks. The test decoders receive control signals from the control processor and from a test logic, which is also connected to the bus, for controlling the circuit blocks. In a test mode, the test logic selects a given circuit block, deactivates all other circuit blocks, transmits test data through the bus to the given circuit block, activates the control processor, receives test data sent through the bus from the given circuit: block, evaluates the test data, and issues a corresponding result signal. The processing of the test data in the given circuit block is determined by the control processor.

Abstract: A circuit configuration for digital bit-serial signal processing includes n input shift registers each being written in parallel or serially with an input data word and then read out by shifting to the right. Sign repetition devices are each assigned to a respective one of the input shift registers for continuously generating and shifting an algebraic sign of the input data word onward in the shift to the right. A serial arithmetic unit is connected downstream of the input shift registers for serially outputting output data words. m output shift registers connected downstream of the serial arithmetic unit are written in serially with the output data words and read out in parallel and/or serially. A control unit is connected to the serial arithmetic unit.