Aquantia Corporation

Hossein Sederat

Paul Langner

Stephen Bates

A communications system and method for switching data rates while maintaining convergence of adaptive components. The data rates can switch between, for example, 10G, 1G, 100M and the like. The adaptive components can include, for example, equalizers, cross-talk filters (e.g., NEXT filters; FEXT filters), transmission drivers, low density parity checks and echo cancellers. The data rate is reduced by maintaining the same symbol rate over a channel, while reducing the number of channels, reducing the symbol alphabet, and zero-filling unused bits in the transmission frame. In addition, full duplex communication can be changed to simplex communication. A usage rotation (e.g., a round robin rotation) switches among different twisted pairs of a communication channel to maintain convergence of the adaptive components. Inactive components can be powered down, or the power can be reduced, in order to reduce the amount of power required for the communications system.

Energy efficiency ethernet (EEE) with 10GBASE-T structures

An ethernet transceiver integrated circuit chip is disclosed including a plurality of transceivers for coupling to a corresponding plurality of physical channels. A channel switcher is coupled to the plurality of transceivers. During a first mode of operation, the channel switcher activates all of the plurality of transceivers to transceive data in accordance with a first aggregate data transfer rate. During a second mode of operation, the channel switcher activates less than all of the plurality of transceivers to transceive data in accordance with a second aggregate data rate that is less than the first aggregate data transfer rate.

Energy efficient ethernet (EEE) with 10GBASE-T structures

A transceiver circuit is disclosed. The transceiver circuit comprises a receive path to receive a differential signal and a first crosstalk filter coupled to the receive path. A common-mode path is provided for carrying a common-mode signal. An RFI interference filter is coupled between the common-mode path and the receive path. Isolation circuitry decouples the RFI interference filter from the first crosstalk filter.

Crosstalk cancellation for a common-mode channel

In one implementation, a transceiver is provided that includes a precoder to pre-equalize a data signal transmitted from the transceiver. The transceiver further includes an interference cancellation system to substantially cancel interference from a data signal received by the transceiver. The precoder and the interference cancellation system share at least one common input signal.

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San Jose, CA, United States of America

Hossein Sederat