Abstract: Techniques are described to adaptively adjust the equalizer settings of each transmitter in a transmitter-receiver pair. The transmitter-receiver pair can be used at least with implementations that comply with 40GBASE-CR4 or 100GBASE-CR10. For implementations that comply with 40GBASE-CR4, equalizer settings of four transmitters may be independently established.

Abstract: According to some embodiments, a digital switching distortion canceller may receive Ethernet data along with an Ethernet class AB transceiver switching signal. A combiner may combine the output of the digital switching distortion canceller with a digital high switching distortion signal to generate a corrected output signal. According to other embodiments, a switching-signal-to-voltage-converter receives an Ethernet class AB transceiver switching signal and generates a common-mode compensation voltage adjustment. An analog combiner may combine the common-mode compensation voltage adjustment with a noisy common-mode signal to generate a stabilized common-mode voltage. Note that reduction of switching-related distortion might be achieved in the digital domain, in the analog domain, or in both domains according to the embodiments described herein.

Abstract: Techniques to perform adaptive interference cancellation are described. A first apparatus may include a timing recovery module to produce a timing recovery command signal, an interference canceller to receive an interference reference signal and produce an interference canceller signal, and an interpolator to couple to the timing recovery module and the interference canceller, the interpolator to receive the timing recovery command signal and the interference canceller signal and produce an interpolated interference canceller signal. A second apparatus may include a time-domain interference canceller to receive an interference reference signal and produce a time-domain interference canceller signal and a frequency-domain interference canceller to receive the interference reference signal and produce a frequency-domain interference canceller signal. Other embodiments are described and claimed.

Abstract: A device, comprising a monitoring slicer adapted to repeatedly sample an internal analog signal to provide a sequence of digital outputs indicating a result of a comparison of the level of the internal analog signal to a reference voltage and an operative unit adapted to perform a task of the device and provide a result without using digital outputs from the monitoring slicer.

Abstract: Techniques are described to reduce delayed reflection inter-symbol interference (ISI) in signals. In some implementations, a channel reflection canceller is provided at a signal receiver to reduce delayed reflection ISI in received signals. The channel reflection canceller may be provided with a signal from an equalizer output or a tentative or final decision from a forward-error correction (FEC) decoder. Based on the signal from the equalizer output or tentative or final decisions from the FEC decoder, the channel reflection canceller may generate a signal to reduce delayed reflection ISI in received signals. In addition or as an alternative, in some implementations, the remote transmitter of the signal generates a delayed reflection ISI reducing signal to reduce delayed reflection ISI present in the signal transmitted over a channel. The transmitter may generate the delayed reflection ISI reducing signal using information provided by the remote signal receiver.

Abstract: A system, apparatus, method and article to converge a communications system receiver are described. The apparatus may include an interference canceller to receive an interference signal and to produce an adaptive signal. The interference canceller is adapted by a first adaptation module. An equalizer is coupled to the interference canceller. The interference canceller is located before the equalizer. The equalizer receives an input signal formed of a sum of a received input signal and the adaptive signal. A slicer is coupled to the equalizer and to the interference canceller. The slicer receives an equalized version of equalizer coefficients and produces a slicer error. The first adaptation module adapts the interference canceller utilizing a convolution of the interference signal with the equalizer coefficients, and multiplying the results by the slicer error. Other embodiments are described and claimed.

Abstract: A 10GBase-T Small Form Factor Pluggable (SFP+) module. The 10GBase-T SFP+ module has a 10GBase-T physical layer (PHY) module with a communication interface and an interface module with SFP+ high speed serial electrical interface (SFI). During receive operation, 10GBase-T data is received from a link partner via the communication interface. The 10GBase-T PHY module processes the 10GBase-T data into intermediate data. The interface module receives the intermediate data from the 10GBase-T PHY module, processes the intermediate data into 10GBase-R data, and outputs the 10GBase-R data to a SFI host via the SFI. During transmit operation, 10GBase-R data is transmitted by a SFI host via the SFI. The interface module processes the 10GBase-R data into intermediate data. The 10GBase-T PHY receives the intermediate data from the interface module, processes the intermediate data into 10GBase-T data, and outputs the 10GBase-T data to a link partner via the communication interface.

Abstract: A method and apparatus to improve adaptation speed of a digital receiver is presented. The receiver includes an equalizer to initiate adaptation to a transmission channel responsive to a first control signal, a slicer coupled to the equalizer to generate symbol decisions based at least in part on an equalized digital signal, logic to receive the symbol decisions and generate a selection signal when a lock onto a training sequence of the symbol decisions occurs, first and second phase detectors to detect phase errors of the equalized digital signal and an incoming digital signal, respectively, and a clock generator to generate a clock signal responsive to one of the first and second phase errors.

Abstract: In one embodiment of the present invention, a method includes establishing a communication link between a first link partner and a second link partner, causing the first link partner to transmit idle signals, and analyzing a desired channel of the communication link using the idle signals. As an example, the communication link may be an Ethernet link and the link may be maintained during the channel analysis so that system data transmissions may be resumed or initiated immediately after the analysis is completed.

Abstract: In one embodiment, the present invention includes an apparatus having an analog front end to receive a signal from a communication channel physical medium, an analog-to-digital converter (ADC) coupled to an output of the analog front end to digitize the received signal, and a digital signal processor (DSP) coupled to receive an output signal of the ADC and to process the digitized signal to generate a decision output and an error signal, and a feedback path to provide the error signal from the DSP to the ADC for use in calibration. Other embodiments are described and claimed.

Abstract: In one embodiment, the present invention includes an apparatus having an analog front end to receive a signal from a communication channel physical medium, an analog-to-digital converter (ADC) coupled to an output of the analog front end to digitize the received signal, and a digital signal processor (DSP) coupled to receive an output signal of the ADC and to process the digitized signal to generate a decision output and an error signal, and a feedback path to provide the error signal from the DSP to the ADC for use in calibration. Other embodiments are described and claimed.

Abstract: In one embodiment, the present invention includes an apparatus having a digital signal processor (DSP) coupled to receive a digitized signal. The DSP may be controlled to perform a timing recovery mechanism that implements a Mueller and Müller (MM)-based algorithm to generate a sensor output responsive to the digitized signal, where the incoming signal is non-linearly precoded in a transmitter from which the signal is received. Other embodiments are described and claimed.

Abstract: In one embodiment, the present invention includes an apparatus having an automatic gain control (AGC) stage to receive an input signal from a communication channel physical medium, a first local gain stage coupled to an output of the AGC stage, an equalizer coupled to an output of the first local gain stage, an echo canceler to receive local data to be transmitted along the communication channel physical medium, and a second local gain stage coupled to an output of the echo canceler. Other embodiments are described and claimed.

Abstract: A wireless communication device and a method and of prioritizing services in a wireless local area network is provided. The method includes defining a first priority of a first service of a first basic service set of a wireless local area network and defining a second priority of a second service of a second basic service set of the wireless local area network, wherein the first priority is different from the second priority.

Abstract: Techniques to perform adaptive interference cancellation are described. A first apparatus may include a timing recovery module to produce a timing recovery command signal, an interference canceller to receive an interference reference signal and produce an interference canceller signal, and an interpolator to couple to the timing recovery module and the interference canceller, the interpolator to receive the timing recovery command signal and the interference canceller signal and produce an interpolated interference canceller signal. A second apparatus may include a time-domain interference canceller to receive an interference reference signal and produce a time-domain interference canceller signal and a frequency-domain interference canceller to receive the interference reference signal and produce a frequency-domain interference canceller signal. Other embodiments are described and claimed.

Abstract: Techniques are described herein that can be used to decode signals received over multiple channels. The received signals may be processed using noise reducing logic. Signal-to-noise ratio information per channel for signals received over each of the multiple channels may be considered to determine reliability information concerning the slicer input for each channel. Low density parity check codes or other forward error correction (FEC) codes may be used to decode the processed signals from all the multiple channels,based on the reliability information.

Abstract: Apparatus, systems, and methods are provided to provide analog pre-equalization to a signal received from a communication channel prior to analog-to-digital conversion of the signal.

Abstract: A system, apparatus, method and article to converge a communications system receiver are described. The apparatus may include an interference canceller to receive an interference signal and to produce an adaptive signal. The interference canceller is adapted by a first adaptation module. An equalizer is coupled to the interference canceller. The interference canceller is located before the equalizer. The equalizer receives an input signal formed of a sum of a received input signal and the adaptive signal. A slicer is coupled to the equalizer and to the interference canceller. The slicer receives an equalized version of equalizer coefficients and produces a slicer error. The first adaptation module adapts the interference canceller utilizing a convolution of the interference signal with the equalizer coefficients, and multiplying the results by the slicer error. Other embodiments are described and claimed.

Abstract: In some embodiments, a method includes determining a characteristic of a communication channel and selecting, on the basis of the determined characteristic, a pre-computed equalizer characteristic for application to signals received via the communication channel.

Abstract: Techniques are described to reduce delayed reflection inter-symbol interference (ISI) in signals. In some implementations, a channel reflection canceller is provided at a signal receiver to reduce delayed reflection ISI in received signals. The channel reflection canceller may be provided with a signal from an equalizer output or a tentative or final decision from a forward-error correction (FEC) decoder. Based on the signal from the equalizer output or tentative or final decisions from the FEC decoder, the channel reflection canceller may generate a signal to reduce delayed reflection ISI in received signals. In addition or as an alternative, in some implementations, the remote transmitter of the signal generates a delayed reflection ISI reducing signal to reduce delayed reflection ISI present in the signal transmitted over a channel. The transmitter may generate the delayed reflection ISI reducing signal using information provided by the remote signal receiver.