A method of reducing crosstalk into a victim line from disturber lines in a communication system may include obtaining a pilot matrix and a measurement vector associated with the pilot matrix, the pilot matrix representing pilot signals transmitted by at least the disturber lines, the measurement vector being influenced by the pilot signals via the crosstalk; estimating estimated crosstalk coefficients of significant ones of the disturber lines by solving a reduced linear system using only non-clipped measurements in the measurement vector, the reduced linear system being derived from the pilot matrix; determining compensation coefficients to reduce the crosstalk based on the estimated crosstalk coefficients; and reducing crosstalk by one or more of pre-compensating signals transmitted on the victim line and post-compensating signals received on the victim line based on the compensation coefficients.

Methods and devices are provided wherein a signal sent on a special operation channel is modified by an identification of a line.

In a transmitter, first and second sets of discrete multitone (DMT) sub-carrier signals or tones are identified. First and second bit groups of a payload data frame corresponding to the first and second sets of tones are selected. The first bit group is then trellis encoded. The second bit group is not trellis encoded. The first trellis coded tone group and the second bit group are then constellation mapped to produce a DMT symbol for transmission. A receiver may use an estimate of signal-to-noise ratio (SNR) of each tone to determine whether to select the tone for inclusion in the first or second set of tones. The receiver may provide the transmitter with information indicating whether a tone is included the first or second set of tones.

In a transmitter, first and second sets of discrete multitone (DMT) sub-carrier signals or tones are identified. First and second bit groups of a payload data frame corresponding to the first and second sets of tones are selected. The first bit group is then trellis encoded. The second bit group is not trellis encoded. The first trellis coded tone group and the second bit group are then constellation mapped to produce a DMT symbol for transmission. A receiver may use an estimate of signal-to-noise ratio (SNR) of each tone to determine whether to select the tone for inclusion in the first or second set of tones. The receiver may provide the transmitter with information indicating whether a tone is included the first or second set of tones.

Communication in a first spectrum and via a first transmission line of first data is according to a time-division duplexing scheme such as G.fast. Communication in a second spectrum and via a second transmission line of second data is according to a frequency-division duplexing scheme such as VDSL2. The first and second spectra both comprise an overlap spectrum. The first transmission line experiences first crosstalk from the second transmission line and the second transmission line experiences second crosstalk from the first transmission line.

A network element is provided comprising at least one switch, which is configurable to connect a subscriber line to a first service line or to a second service line, wherein the connection of the subscriber line to the first service line or to the second service line is configured via a signal conveyed across the second service line. Also, a system is suggested comprising two or more switches, wherein each switch is configurable to connect a subscriber line to a first service line or to a second service line, a control circuitry for controlling the two or more switches, an MSAN comprising two or more second service lines, wherein a dedicated service line of an MSAN is used for controlling the control circuitry. Further, methods for operating the network element or the system are suggested.

The present invention discloses a method and an apparatus to automatically remove crosstalk, which can automatically mask G.fast frequencies that will produce crosstalk between an existing transmission line and each port of a DPU/DSLAM equipment without unnecessary manual operation, to automatically remove crosstalk interference between G.fast and the existing transmission line, and is applicable for various generic interfaces. According to the present invention, the installation time is greatly reduced, human errors are also reduced, and the installation can be done correctly by ordinary technicians, which is advantageous to the promotion of G.fast systems.

Methods, devices and techniques are disclosed where vectoring is adapted to lines becoming inactive and active, for example in a discontinued operation. In some embodiments, the vectoring is modified based on already present coefficients.

A method is provided accessing a device of a fixed line system comprising: (i) determining at least one measurement result by a measurement function of the device; (ii) comparing the at least one measurement result with at least one predefined value; (iii) conducting a predefined operation if the comparison indicates that the at least one measurement result corresponds to the at least one predefined value; (iv) determining the at least one measurement result by the measurement function, wherein the measurement function is connected or connectable via a connection to a signature function of an access system; (v) wherein the signature function comprises a circuitry that affects parameters measured by the measurement function of the device. Also, a method for access the device via an access system, the device, the access system and a computer program product as well as a computer-readable medium are suggested.

The method for an automatic selection of a quality of service queuing mechanism for upstream traffic on a high bandwidth access line comprises the steps of measuring the upstream rate (1) on the access line (10), and depending on that rate (20), keeping a software queuing mechanism enabled in case of an upstream rate below a defined threshold (S) (30), and disabling the software queuing mechanism in case of an upstream rate above the defined threshold (40).