Abstract: In a method for suppressing an interference signal during a transmission of data symbols between two transceivers, a transmit data symbol sequence is transmitted from a first transceiver to a second transceiver. An interference signal, which has occurred during the transmission of the transmit data symbol sequence, is detected in dependence on a received data symbol sequence, and the data symbol of the transmit data symbol sequence, which data symbol was transmitted last, is repeatedly transmitted from the first transceiver to the second transceiver when the interference signal occurs.

Abstract: In a data transmission a system controller generates a deactivation signal when a data stream between a subscriber transceiver and an exchange transceiver has no payload in either direction. Exchange-end transmission coefficients are then stored by an exchange memory. The deactivation signal is transmitted back to the subscriber-end transceiver, which then stores subscriber-end coefficients in a subscriber memory. The subscriber transceiver then sends the deactivation signal back to the exchange transceiver, which then stops data transmission. In response to detecting the stopping of data transmission, the subscriber-end transceiver likewise stops data transmission. Both transceivers are then placed in a stand-by state.

Abstract: The invention relates to a method for transmitting data streams where transmission/reception devices (LTU, NTU) deactivated to a standby state are activated by performing a warm start sequence, with transmission line parameters being determined (S103) using an exchange-end transmission/reception device (LTU) following provision of a subscriber-end transmitted signal, transmission line parameters being determined (S104) using a subscriber-end transmission/reception device (NTU) following provision of an exchange-end transmitted signal, echo cancelation being realigned (S105) using a subscriber-end transmission/reception device (NTU) following provision of a subscriber-end transmitted signal, and/or echo cancelation being realigned (S106) using an exchange-end transmission/reception device (LTU) following provision of an exchange-end transmitted signal.

Abstract: A method of mitigating transmission delay fluctuations in a communication system having a variable data rate and block-oriented subsystems, such as interleavers. The method comprises interspersing dummy data with genuine data to form a combined data stream for the subsystems. When the data rate decreases, the rate at which dummy data is supplied increases to stabilize the delay. In one embodiment, the dummy data is discarded prior to transmission and may be reintroduced as needed on the receiving end. In another embodiment, the dummy data is transmitted and only discarded after processing at the receiving end. For this later embodiment in a multi-tone system, the dummy data can be sorted onto separate sub-carriers for transmission and the power levels for those carriers can be dropped to reduce overall power consumption and crosstalk. The concept can be used to extend seamless rate adaptation to systems with forward error correction.

Abstract: Method and apparatus for transmitting a transmission signal via a two-core line, in particular a telephone line, in which case, with the aid of corresponding transmission devices (2, 3), two partial signals are generated and are transmitted via a respective core (A, B) of the line and the transmission signal is formed by the alternating-current difference between the two partial signals. In order to suppress common-mode components in the partial signals, a calibration is carried out in such a way that the transmission devices (2, 3) output essentially the same output level.

Abstract: The invention relates to a method for setting up a data transmission link between xDSL transceivers in which the period for setting up the data transmission link is minimum. The method exhibits a very low susceptibility to interference. An XDSL transceiver with an echo cancellation circuit and an equalizer is also dislcosed.

Abstract: Methods and communication systems are presented, in which impulse noise is monitored on a communication channel, and an interleaver depth is adjusted according to the monitored impulse noise without interrupting communication service.

Abstract: Methods and communication systems are presented, in which impulse noise is monitored on a communication channel, and impulse noise protection parameters are adjusted according to the monitored impulse noise without interrupting communication service.

Abstract: Methods for changing a depth of interleaver devices (2) and de-interleaver devices (8) are provided, whereby a change in the depth is possible while transmitting or receiving operations are in progress. For this, delays of delaying devices (11-18) are enlarged or reduced, additional data values (21-24, 29-32) being inserted to guarantee smooth flowing data transmission.

Abstract: An output signal to be transmitted via an especially two wire transmission line (A, B), which is composed of a transmission signal and a DC supply voltage, is generated by a data transmission device especially designed in the form of a SLIC circuit. Using a control circuit (5-8), which tracks the DC supply voltage on the output side of the transmission device (1-3) in such a manner that the level of the DC supply voltage does not decrease, it is possible to ensure that both the specified requirements concerning the maximally admissible DC voltage drop as well as the specified requirements concerning the reflection attenuation are met.

Abstract: A splitter circuit (19) serves to combine on the transmission side signals which are to be transmitted in different frequency bands (A-C), as well as to separate on the reception side these signals which are transmitted in different frequency bands. For this purpose, the splitter circuit (19) has a circuit section (13) designed as purely passive, for the rough signal and impedance separation, as well as the filters (3, 4; 9, 10) allocated to the individual transmission and reception sections, for the exact filtering out of the individual signal in each case. These separate filters (3, 4; 9, 10) are arranged in the transmission direction upstream of a corresponding four-wire/two-wire conversion, and in the reception direction downstream of a corresponding two-wire/four-wire conversion, so that the signal stream takes place via these filters in one direction only, and the filters can be designed as purely active filters or digital filters.

Abstract: A circuit configuration is provided for supplying a telephone subscriber loop with a supply voltage, for transmitting a transmitted signal into the telephone subscriber loop, and for receiving a received signal from the telephone subscriber loop. The telephone subscriber loop has a first line and a second line. The circuit configuration has a supply voltage source with a first terminal and a second terminal between which a supply voltage drops; a first circuit connected with the first line and having first and second supply voltage connections; and a second circuit connected with the second line and having third and fourth supply voltage connections. The first supply voltage connection is connected with the first terminal and the fourth supply voltage connection is connected with the second terminal. A network-side terminal of a telephone subscriber loop and a chip set are also provided.

Abstract: The invention relates to a method for setting up a data transmission link between xDSL transceivers, comprising the following steps: sending of an echo adjustment signal (WECL) by a first xDSL transceiver (1-1) to a second xDSL transceiver (1-2) until an echo cancelation circuit (21-1) of the first xDSL transceiver (1-1) is set, the second xDSL transceiver (1-2) synchronizing to the echo adjustment signal (WECL) and the second xDSL transceiver (1-2) not sending; sending of a first synchronization signal (WSL) via the first xDSL transceiver (1-1) to the second xDSL transceiver (1-2) for synchronizing the second xDSL transceiver (1-2), the first synchronization signal (WSL) being different from the echo adjustment signal (WECL); sending of a second synchronization signal (WSN) by the second xDSL transceiver (1-2) to the first xDSL transceiver (1-1) for synchronizing the first xDSL transceiver (1-1) when the second xDSL transceiver (1-2) is completely synchronized by the first synchronization signal (WSL), the s

Abstract: An output signal to be transmitted via an especially two wire transmission line (A, B), which is composed of a transmission signal and a DC supply voltage, is generated by a data transmission device especially designed in the form of a SLIC circuit. Using a control circuit (5-8), which tracks the DC supply voltage on the output side of the transmission device (1-3) in such a manner that the level of the DC supply voltage does not decrease, it is possible to ensure that both the specified requirements concerning the maximally admissible DC voltage drop as well as the specified requirements concerning the reflection attenuation are met.

Abstract: In a data transmission a system controller generates a deactivation signal when a data stream between a subscriber transceiver and an exchange transceiver has no payload in either direction. Exchange-end transmission coefficients are then stored by an exchange memory. The deactivation signal is transmitted back to the subscriber-end transceiver, which then stores subscriber-end coefficients in a subscriber memory. The subscriber transceiver then sends the deactivation signal back to the exchange transceiver, which then stops data transmission. In response to detecting the stopping of data transmission, the subscriber-end transceiver likewise stops data transmission. Both transceivers are then placed in a stand-by state.

Abstract: The invention relates to a method for transmitting data streams where transmission/reception devices (LTU, NTU) deactivated to a standby state are activated by performing a warm start sequence, with transmission line parameters being determined (S103) using an exchange-end transmission/reception device (LTU) following provision of a subscriber-end transmitted signal, transmission line parameters being determined (S104) using a subscriber-end transmission/reception device (NTU) following provision of an exchange-end transmitted signal, echo cancelation being realigned (S105) using a subscriber-end transmission/reception device (NTU) following provision of a subscriber-end transmitted signal, and/or echo cancelation being realigned (S106) using an exchange-end transmission/reception device (LTU) following provision of an exchange-end transmitted signal.