Cisco Technology, Inc.

Jianquan Lou

Alpesh Umakant Bhobe

Hailong Zhang

Xiaoxia Zhou

Jinghan Yu

Yingchun Shu

Joel Richard Goergen

Xiao Li

Guangcao Fu

Zhou Yang

Hugh Barrass

Quanhui Sun

Qiuhua Zhu

Ming Chi

Haibin Tang

Jun Liu

Feng Ji

Jerrold Mark Pianin

Li Xiaogang

Hongmei Fan

Shun Li

Huasheng Zhao

Luli Gong

Chen Peng

Juhi Garg

Xiangpeng Yao

Baojun Zhang

An electromagnetic absorber includes a body arranged to surround a perimeter of an integrated circuit chip. The body is arranged to absorb electromagnetic radiation leaking from the integrated circuit chip. The body defines an aperture through which the integrated circuit chip extends and a plurality of slots positioned around the aperture.

Slotted absorber

A method in which a plurality of transmit signals are generated at data rates that are offset from each other by inserting an idle data block into a data stream for one or more transmit signals of the plurality of transmit signals to increase a data rate for the one or more transmit signals, thereby minimizing detectable electromagnetic interference at a particular frequency. The method further includes converting each transmit signal of the plurality of transmit signals to a corresponding optical transmit signal of a plurality of optical transmit signals for transmission via a corresponding channel of a plurality of channels of an optical network device and transmitting the plurality of optical transmit signals via respective ones of the plurality of channels for transmission on respective optical fibers.

Dispersing data rate to mitigate electromagnetic interference

Presented herein is an air vent including a plate, and a non-uniform array of openings extending through a thickness of the plate. The non-uniform array of openings arranged to admit a flow of cooling air through the plate. The plate and the non-uniform array of openings are arranged to attenuate electromagnetic interference (EMI) emitted through the plate.

Air vent with openings of non-uniform size and location for improved EMI shielding

In one embodiment, an apparatus includes an array of transformers and common mode chokes each comprising a magnetic core and windings wound around the magnetic core at opposing locations on the magnetic core, and a retaining groove on each of the magnetic cores to maintain the windings in their opposing locations on the magnetic core. The transformers and common mode chokes are positioned in the array with the windings on each of the magnetic cores located offset to the windings of adjacent magnetic cores in the array to reduce crosstalk and improve common mode noise rejection.

Biorthogonal windings on transformer and common mode choke for network port

A method in which a plurality of transmit signals are generated at data rates that are offset from each other to minimize detectable electromagnetic interference at a particular frequency. The method further includes converting each transmit signal to a corresponding optical transmit signal of a plurality of optical transmit signals for transmission via a corresponding channel of a plurality of channels of an optical network device and transmitting the plurality of optical transmit signals via respective ones of the plurality of channels for transmission on respective optical fibers.

In one embodiment, a method includes positioning a first component for generating a differential signal on a printed circuit board, positioning a second component for receiving the differential signal on a printed circuit board, and routing a differential conductor pair on a path between the first component and the second component, wherein the path comprises at least one turn in which the differential conductor pair changes direction. A first conductor and a second conductor of the differential conductor pair each comprise a plurality of sets of bends proximate to the turn to provide skew compensation while reducing differential mode to common mode conversion and wherein each of the sets of bends in the second conductor is aligned with one of the sets of bends in the first conductor.

Asymmetric dual bend skew compensation for reducing differential mode to common mode conversion

In one embodiment, an apparatus includes a plurality of optical module ports in communication with a physical layer device in a network device. Communication of signals from the physical layer device to the optical module ports is configured such that the signals received at the optical module ports adjacent to one another are at different phases to reduce electromagnetic interference associated with the optical module ports.

Multiple port network device with differential ports for reduced electromagnetic interference at optical modules

In one embodiment, an apparatus includes a plurality of transformers and a plurality of common mode chokes, each of the transformers and the common mode chokes comprising a magnetic core and windings wound around the magnetic core at generally opposite sides thereof. The transformers and common mode chokes are arranged in an array with the windings on each of the magnetic cores positioned generally orthogonal to the windings of adjacent magnetic cores in the array to reduce crosstalk and improve common mode noise rejection.

In some implementations, a method includes analyzing an amount of data communicated by a set of network interfaces. The data communicated by the set of network interfaces is processed by a set of functional units and a set of queues includes the data communicated by the set of network interfaces. The method also includes activating a first functional unit of the set of functional units when a first size of a first queue of the set of queues is above a first threshold. The method further includes deactivating the first functional unit of the set of functional units when the first size of the first queue of the set of queues is below a second threshold. The method further includes causing the data to be forward to one or more active functional units via a data interconnect coupled to the set of network interfaces and the set of functional units.

Activating and deactivation functional units of a line card

An electromagnetic interference (EMI) shielding apparatus includes a cage structure having an opening at a first end and a second end opposite to first end. The cage structure is configured to contain one or more electrical components that emit electromagnetic energy and a connector for the one or more electrical components. The first end is configured to receive a pluggable module that is to connect to the one or more electrical components. The EMI shielding apparatus further includes a filler assembly disposed in the opening. The filler assembly is biased to close the opening of the cage structure when a pluggable module is not inserted/plugged in the opening.

Electromagnetic interference shielding apparatus

An electromagnetic interference (EMI) gasket is provided that includes a resiliently-flexible and conductive outer shell, a cushioning element disposed in the outer shell, and at least one magnetic component disposed in the outer shell configured to magnetically couple to a conductive surface of an electronic device chassis.

Magnetic electromagnetic interference gasket

An electrical device includes a core structure having a first core section, a second core section, and a third core section. The electrical device further includes a first coil electrically coupled to the first core section and the second core section to form a choke and a primary winding of a transformer. The choke is configured to reduce common mode noise for an electrical signal received by the electrical device, and the primary winding of the transformer is configured to induce a magnetic field on the third core section. The electrical device also includes a second coil electrically coupled to the third core section, which forms a secondary winding of the transformer and receives electromagnetic energy from the magnetic field induced by the primary winding of the transformer.

Electrical device with integrated transformer and common mode choke

Presented herein is a modular connector with electromagnetic interference suppression. The modular connector includes a substrate, at least one set of spring pins, and a ferrite component. Each spring in the at least one set of springs includes a first portion adjacent the substrate and a second portion extending away from the substrate. The ferrite component surrounds the at least one set of spring pins, couples the at least one set of spring pins to the substrate, and is configured to suppress electromagnetic interference.

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Shanghai, China

Jianquan Lou