摘要:
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.
摘要:
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.
摘要:
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.
摘要:
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.
摘要:
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.
摘要:
According to some embodiments, a first measurement of a network device signaling characteristic is performed. The network device includes a first communication port and a second communication port, the second port being associated with a detachable attachment. The first measurement is performed when the attachment is not attached to the second port. A second measurement of the signaling characteristic is then performed when the attachment is attached to the second port. At least one corrective value to be used by the network device is then determined based on the first and second measurement.
摘要:
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.
摘要:
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.
摘要:
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.
摘要:
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.