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公开(公告)号：US10771109B1
公开(公告)日：2020-09-08
申请号：US16281769
申请日：2019-02-21
Applicant: Cisco Technology, Inc.
Inventor： Hang Jin , John T. Chapman
Abstract: A hybrid active tap may be provided. The hybrid active tap may comprise a first branch and a second branch. The first branch may be disposed between a first diplexer and a second diplexer. The first branch may correspond to a first frequency spectrum. The second branch may be disposed between the first diplexer and the second diplexer. The second branch may correspond to a second frequency spectrum. The hybrid active tap may further comprise a third branch, a fourth branch, a splitter, and an amplification device. The third branch may be disposed between a first coupler and a third diplexer. The first coupler may be coupled to the first branch. The fourth branch may be disposed between a second coupler and the third diplexer. The second coupler may be coupled to the second branch. The splitter may be connected to the third diplexer and the amplification device may be disposed in the first branch.
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公开(公告)号：US20200274577A1
公开(公告)日：2020-08-27
申请号：US16281769
申请日：2019-02-21
Applicant: Cisco Technology, Inc.
Inventor： Hang Jin , John T. Chapman
Abstract: A hybrid active tap may be provided. The hybrid active tap may comprise a first branch and a second branch. The first branch may be disposed between a first diplexer and a second diplexer. The first branch may correspond to a first frequency spectrum. The second branch may be disposed between the first diplexer and the second diplexer. The second branch may correspond to a second frequency spectrum. The hybrid active tap may further comprise a third branch, a fourth branch, a splitter, and an amplification device. The third branch may be disposed between a first coupler and a third diplexer. The first coupler may be coupled to the first branch. The fourth branch may be disposed between a second coupler and the third diplexer. The second coupler may be coupled to the second branch. The splitter may be connected to the third diplexer and the amplification device may be disposed in the first branch.
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公开(公告)号：US20200186192A1
公开(公告)日：2020-06-11
申请号：US16792740
申请日：2020-02-17
Applicant: Cisco Technology, Inc.
Inventor： John T. Chapman , Hang Jin , Tong Liu
Abstract: Echo cancellation to alleviate timing varying channels may be provided. First, a feedback signal corresponding to one of a plurality of downstream paths and a combination upstream signal comprising a combination of upstream signals from a plurality of upstream paths may be received. Next, a plurality of echo corrected signals may be created using the feedback signal, the combination upstream signal, and a plurality of echo cancelation coefficients that each respectively correspond to each one of the plurality of echo corrected signals and that are different from each other. Then a one of the plurality of echo cancelation coefficients that corresponds to a one of the plurality of echo corrected signals that provides a best echo cancelation performance as compared to other ones of the plurality of echo corrected signals may be selected to use.
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公开(公告)号：US10523270B1
公开(公告)日：2019-12-31
申请号：US16008737
申请日：2018-06-14
Applicant: Cisco Technology, Inc.
Inventor： John T. Chapman , Hang Jin , John Holobinko , Yubin Chen , John Alexander Ritchie, Jr. , Martin Mattingly
Abstract: Full Duplex (FDX) enhanced node deployment may be provided. First, a first device level may be provided comprising a first plurality of FDX enhanced nodes. The first plurality of FDX enhanced nodes may comprise a first FDX enhanced node and a second FDX enhanced node. The first plurality of FDX enhanced nodes may be operated in a first mode. Next, a second device level may be provided comprising a third FDX enhanced node. The second device level may be upstream from the first device level. The third FDX enhanced node may be operated in a second mode. Then an input port of the first FDX enhanced node and an input port of the second FDX enhanced node may be provided with a same type of input that is being provided to an input port of the third FDX enhanced node. The first plurality of FDX enhanced nodes may then be switched from being operated in the first mode to being operated in the second mode.
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公开(公告)号：US10516435B1
公开(公告)日：2019-12-24
申请号：US16183548
申请日：2018-11-07
Applicant: Cisco Technology, Inc.
Inventor： Hang Jin , John T. Chapman , Tong Liu
Abstract: Detection of a device connected to a network element may be provided. First, upstream allocation data corresponding to the device may be received. Next, active minislot data detected at the network element may be received. It may then be determined that the upstream allocation data and the active minislot data correlate. In response to determining that the upstream allocation data and the active minislot data correlate, it may be determined that the device is attached to the network element.
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Patent Agency Ranking
公开(公告)号：US10469128B1
公开(公告)日：2019-11-05
申请号：US15957079
申请日：2018-04-19
Applicant: Cisco Technology, Inc.
Inventor： Hang Jin , John T. Chapman
Abstract: Analog echo cancellation with Digital-to-Analog Converter (DAC) noise suppression may be provided. First, a test signal may be sent through an echo cancellation pathway during a downstream silence period and an upstream silence period. The echo cancellation pathway may comprise an electronic element. Next, a loopback response signal may be received in response to sending the test signal through the echo cancellation pathway. Then a channel response model may be created that characterizes a channel response of the loopback response signal and a non-linear model may be created that characterizes a non-linearity of the electronic element. Next, for a downstream signal, a non-linear component may be generated based on the created non-linear model. The generated non-linear component may be convolved with the created channel response model. The convolved non-linear component may then be subtracted from an upstream signal.
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公开(公告)号：US20190326861A1
公开(公告)日：2019-10-24
申请号：US15957061
申请日：2018-04-19
Applicant: Cisco Technology, Inc.
Inventor： Hang Jin , John T. Chapman
Abstract: Digital pre-distortion may be provided. First, a radio frequency (RF) domain distortion correcting signal and a base band (BB) domain distortion correcting signal may be initialized. Then the RF domain distortion correcting signal may be generated from an input signal. The generated RF domain distortion correcting signal may correspond to an amplifier. Next, the BB domain distortion correcting signal may be generated from the input signal. The generated BB domain distortion correcting signal may correspond to the amplifier. Then the RF domain distortion correcting signal and the BB domain distortion correcting signal may be combined to form a hybrid distortion correcting signal. The hybrid distortion correcting signal may then be provided to input matching circuitry feeding the amplifier.
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公开(公告)号：US20190326860A1
公开(公告)日：2019-10-24
申请号：US15956858
申请日：2018-04-19
Applicant: Cisco Technology, Inc.
Inventor： Hang Jin , John T. Chapman
Abstract: Digital pre-distortion may be provided. First, a characterization for input matching circuitry may be determined. Next, a characterization for non-linearity of an amplifier connected to the input matching circuitry may be determined. Then, a distortion correcting signal may be generated from an input signal based on the determined characterization for the input matching circuitry and the determined characterization for the non-linearity of the amplifier. The generated distortion correcting signal may then be provided to the input matching circuitry.
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公开(公告)号：US10312968B2
公开(公告)日：2019-06-04
申请号：US15397603
申请日：2017-01-03
Applicant: CISCO TECHNOLOGY, INC.
Inventor： Hang Jin
IPC: H04L12/24 , H04L12/26 , H04B3/46 , H04B3/52 , H04L29/08 , H04B3/14 , H04B3/493 , G01R31/3181 , G01R31/3193 , H04L12/64 , H04L5/00 , H04L27/26
Abstract: One embodiment is a system including a data collector located in a cable network for capturing multi-tone signals traversing the cable network; a data repository located in a cloud network and having an interface for communicating with the data collector and for storing the multi-tone signals captured by the data collector and network data associated with the cable network; and a central server including a memory element storing Predictive Services Management (PSM) algorithms comprising instructions and associated data and a processor operable to execute the PSM algorithms. The central server is configured for detecting a fault in the cable network and identifying a segment associated with the fault; determining a maximum tap magnitude for the fault; calculating an aggregate tap magnitude for the fault; and classifying a severity of the fault based at least in part on the maximum tap magnitude and the aggregate tap magnitude.
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公开(公告)号：US10230519B2
公开(公告)日：2019-03-12
申请号：US15483260
申请日：2017-04-10
Applicant: CISCO TECHNOLOGY, INC.
Inventor： John T. Chapman , Hang Jin , Tong Liu
IPC: H04L5/14 , H04L5/00 , H04L12/917 , H04L12/911 , H04B3/52
Abstract: An example apparatus comprises a processor, a memory element, and a media access control (MAC) scheduler. The MAC scheduler is configured to implement a transmission-reception (T-R) coordination scheme among a plurality of cable modems in a cable network, wherein the cable modems are categorized into interference groups. The MAC scheduler is further configured to assign one or more of the interference groups to at least one transmission group based upon predetermined criteria; and determine an upstream bandwidth constraint and downstream bandwidth constraint for the at least one transmission group, wherein the upstream bandwidth constraint and downstream bandwidth constraint is implemented by proportionally modifying an allocated upstream bandwidth and an allocated downstream bandwidth for the at least one transmission group to require that the sum of the allocated upstream bandwidth and the allocated downstream bandwidth does not exceed a spectrum capacity for the at least one transmission group.
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