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.

Control of a digital communication system having a plurality of communication lines on which signals are transmitted and received is implemented using a variety of methods and systems. According to one embodiment of the present invention, a method is implemented where the signals are affected by interference during transmission and each of the communication lines has at least one transmitter and at least one receiver. A model is created of the interference characteristics due to the signals carried on the communication lines. Interference characteristics for a line are determined based on the model and actual signals carried on other communication lines different from the line for which the characteristics are being determined. Actual interference is compensated for on the communication line using the determined interference characteristics.

Control of a digital communication system having a plurality of communication lines on which signals are transmitted and received is implemented using a variety of methods and systems. According to one embodiment of the present invention, a method is implemented where the signals are affected by interference during transmission and each of the communication lines has at least one transmitter and at least one receiver. A model is created of the interference characteristics due to the signals carried on the communication lines. Interference characteristics for a line are determined based on the model and actual signals carried on other communication lines different from the line for which the characteristics are being determined. Actual interference is compensated for on the communication line using the determined interference characteristics.

A computing apparatus, includes a first apparatus and a second apparatus, a differential transmission line that couples the first apparatus and the second apparatus to each other, a noise application unit that applies noise to the differential transmission line, a noise control unit that controls the noise application unit, and a margin measurement unit that measures an occurrence frequency of communication error between the first apparatus and the second apparatus.

A computing apparatus, includes a first apparatus and a second apparatus, a differential transmission line that couples the first apparatus and the second apparatus to each other, a noise application unit that applies noise to the differential transmission line, a noise control unit that controls the noise application unit, and a margin measurement unit that measures an occurrence frequency of communication error between the first apparatus and the second apparatus.

Methods and systems are disclosed which can perform cable characterization at link-up and during in-service monitoring to provide the best data throughput. In some embodiments a plurality of frequency tones may be sent across a cable to a remote system. A plurality of return loss values associated with sending the plurality of frequency tones may then be measured and stored. Next, a crosstalk value across the cable may be computed. A quality value for the cable may then be determined based on at least the plurality of return loss values and the crosstalk value.

Methods and systems are disclosed which can perform cable characterization at link-up and during in-service monitoring to provide the best data throughput. In some embodiments a plurality of frequency tones may be sent across a cable to a remote system. A plurality of return loss values associated with sending the plurality of frequency tones may then be measured and stored. Next, a crosstalk value across the cable may be computed. A quality value for the cable may then be determined based on at least the plurality of return loss values and the crosstalk value.

A method and apparatus for generating a probability density function eye are provided. The method preferably includes the steps of acquiring an input waveform, performing a clock data recovery in accordance with the input waveform to determine one or more expected transition times and defining a plurality of unit intervals of the input waveform in accordance with the one or more expected transition times. One or more values of one or more data points may then be determined in accordance with the input waveform in accordance with the one or more expected transition times, and a category for each unit interval in accordance with its state and its position within the input waveform may also be determined. One or more histograms may then be generated for the determined one or more values for each category of unit intervals.

A method and apparatus for generating a probability density function eye are provided. The method preferably includes the steps of acquiring an input waveform, performing a clock data recovery in accordance with the input waveform to determine one or more expected transition times and defining a plurality of unit intervals of the input waveform in accordance with the one or more expected transition times. One or more values of one or more data points may then be determined in accordance with the input waveform in accordance with the one or more expected transition times, and a category for each unit interval in accordance with its state and its position within the input waveform may also be determined. One or more histograms may then be generated for the determined one or more values for each category of unit intervals.

Disclosed is a method for mitigating crosstalk performed by a network node of a wireless communication network operable in a base station system of the wireless communication network, the base station system comprising an intermediate radio unit, IRU, a baseband unit, BBU, connected to the IRU and a plurality of radio heads, RHs, connected to the IRU via a plurality of metallic conductors.