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.

公开(公告)号：US10177943B2

公开(公告)日：2019-01-08

申请号：US15878334

申请日：2018-01-23

Applicant: Marvell World Trade Ltd.

Inventor： Shaoan Dai ,  Zhenzhong Gu ,  Kok-Wui Cheong

IPC: H04L25/03 ,  H04B3/493 ,  H04B3/23 ,  H04B17/309

Abstract: Systems and techniques relating to channel degradation detection for communication systems are described. A described system includes a processor and an interface to transmit signals and receive signals via a channel that includes a cable. The processor can be configured to perform echo cancellation based on echo tap values to remove portions of the transmitted signals that appear as echoes within the received signals, signal equalization based on equalizer tap values, or both. The processor can be configured to determine a channel quality indicator of the channel based on one or more of the echo tap values, one or more of the equalizer tap values, or both. The processor can be configured to generate a warning indication based on the channel quality indicator indicating a degradation of the cable or the channel.

公开(公告)号：US10069963B2

公开(公告)日：2018-09-04

申请号：US15185725

申请日：2016-06-17

Applicant: Oki Data Corporation

Inventor： Kimiaki Ogawa

IPC: H04M1/76 ,  H04M3/28 ,  H04M7/00 ,  H04M11/06 ,  H04B3/493 ,  H04M19/02 ,  H04N1/00

Abstract: A communication device includes: a signal generator configured to generate a first signal and supply the first signal to a telephone line; a terminator having a variable terminal impedance as seen from the telephone line; a detector configured to detect a difference between the terminal impedance and a line impedance of the telephone line; and a controller configured to determine the terminal impedance so that the difference is reduced.

公开(公告)号：US20180069595A1

公开(公告)日：2018-03-08

申请号：US15664621

申请日：2017-07-31

Applicant: Marvell World Trade Ltd.

Inventor： Shaoan Dai ,  Kok-Wui Cheong ,  Zhenzhong Gu

IPC: H04B3/20 ,  H04B3/493 ,  H04B3/04 ,  H04B1/38

CPC classification number: H04B3/20 ,  H04B1/38 ,  H04B3/04 ,  H04B3/493

Abstract: Embodiments described herein provide echo cancellation power saving management at a cable transceiver. An echo response signal having a first number of signal components is obtained, via an echo cancellation filter. At a first iteration for calculating a first accumulative echo power, a respective echo tap that corresponds to the first iteration is identified. The first accumulative echo power is calculated for the respective iteration by summing powers of outputs from a last echo tap to the respective echo tap. It is then determined whether the first accumulative echo power, exceeds a pre-determined echo power threshold. If the first accumulative echo power exceeds the pre-determined echo power threshold, a first turn-off indication is sent to the echo cancellation filter to turn off all echo taps including and between the last echo tap to the first echo tap.

公开(公告)号：US09887737B2

公开(公告)日：2018-02-06

申请号：US15372271

申请日：2016-12-07

Applicant: CISCO TECHNOLOGY, INC.

Inventor： Hang Jin

IPC: H04B3/14 ,  H04B3/46 ,  H04L12/24 ,  H04L12/26 ,  H04L27/26 ,  H04B3/493 ,  G01R31/3181

CPC classification number: H04B3/46 ,  G01R31/3181 ,  G01R31/31937 ,  H04B3/142 ,  H04B3/493 ,  H04B3/52 ,  H04L5/0005 ,  H04L27/2647 ,  H04L41/0631 ,  H04L41/0677 ,  H04L41/0686 ,  H04L41/147 ,  H04L43/10 ,  H04L43/16 ,  H04L67/1097 ,  H04L2012/6421 ,  H04Q2213/13012

Abstract: An example method for radio frequency (RF) signal fault signature isolation in cable network environments is provided and includes searching in phase domain for an echo in a channel response characterizing a channel in a cable network, the channel facilitating communication of a multi-tone signal in the cable network; identifying a phase in which the echo is found; calculating a tap amplitude corresponding to the identified phase, the calculated tap amplitude being indicative of group delay in the channel; correcting for the group delay in the multi-tone signal, for example, by subtracting the calculated tap amplitude from the multi-tone signal; and identifying a fault signature when amplitude of the corrected signal is greater than a threshold and the identified fault signature triggers operational maintenance of the cable network.

公开(公告)号：US09882747B2

公开(公告)日：2018-01-30

申请号：US15380965

申请日：2016-12-15

Applicant: Marvell World Trade Ltd.

Inventor： Shaoan Dai ,  Zhenzhong Gu ,  Kok-Wui Cheong

IPC: H03H7/40 ,  H04L25/03 ,  H04B3/493 ,  H04B3/23 ,  H04B17/309

CPC classification number: H04L25/03057 ,  H04B3/23 ,  H04B3/235 ,  H04B3/237 ,  H04B3/493 ,  H04B17/309 ,  H04L25/03146 ,  H04L25/03885 ,  H04L2025/03802

Abstract: Systems and techniques relating to channel degradation detection for communication systems are described. A described system includes an interface to transmit signals and receive signals via a channel that includes a cable; an echo canceller coupled with the interface, the echo canceller to perform echo cancellation based on echo tap values to remove portions of the transmitted signals that appear as echoes within the received signals; an equalizer coupled with the interface, the equalizer to perform signal equalization based on equalizer tap values, the equalizer tap values being determined based on at least a portion of the received signals to adjust an impulse response of the channel and reduce inter-symbol interference within the received signals; and circuitry configured to determine a return loss channel quality indicator of the channel based on the echo tap values, determine an insertion loss channel quality indicator of the channel based on the equalizer tap values, or both.

公开(公告)号：US09800290B2

公开(公告)日：2017-10-24

申请号：US15005764

申请日：2016-01-25

Applicant: REALTEK SEMICONDUCTOR CORP.

Inventor： Shih-Wei Wang ,  Liang-Wei Huang ,  Ching-Yao Su ,  Sheng-Fu Chuang

IPC: H04B3/46 ,  H04B3/23 ,  H04B3/493

CPC classification number: H04B3/237 ,  H04B3/231 ,  H04B3/493

Abstract: A channel detection method for an echo canceller of a communication device is provided. The method includes the following steps. A first detection signal is transmitted to an end of a channel coupled to the communication device. A plurality of taps corresponding to a reflected signal of the first detection signal are received by an echo canceller at the end of the channel. The taps corresponding to the reflected signal are compared with a reference value corresponding to each of the taps so as to determine whether each of the taps is larger than or equal to the corresponding reference value. When the tap is determined to be larger than or equal to the reference value corresponding to the tap, the tap and a position of the tap are recorded.

公开(公告)号：US20220166461A1

公开(公告)日：2022-05-26

申请号：US17533177

申请日：2021-11-23

Applicant: Marvell Asia Pte Ltd

Inventor： Wensheng Sun ,  Shaoan Dai ,  Xing Wu

IPC: H04B3/493 ,  G06K9/00 ,  H04L67/12 ,  G06N20/00 ,  G07C5/08

Abstract: Methods and systems provide for using echo measurements, to detect cable faults in cables of vehicular communication networks.

公开(公告)号：US20210135709A1

公开(公告)日：2021-05-06

申请号：US16675685

申请日：2019-11-06

Applicant: Rohde & Schwarz GmbH & Co. KG

Inventor： Michael Feilen

IPC: H04B3/493 ,  G01R31/02

Abstract: A testing of a transmission path of a cable connection between a first position and a second position is provided. Test signals are transmitted via the transmission path, and a transfer function is determined by evaluating the test signals. In order to assess the properties of the transmission path, the transfer function is transformed to an impulse response and the echo power of the transmission path is evaluated by analyzing the impulse response.

公开(公告)号：US10530559B2

公开(公告)日：2020-01-07

申请号：US16136329

申请日：2018-09-20

Applicant: Marvell World Trade Ltd.

Inventor： Xing Wu

IPC: H04L5/14 ,  H04B3/23 ,  H04L12/26 ,  H04L12/24 ,  H04B3/493

Abstract: An Ethernet transceiver includes physical-layer (PHY) circuitry and a signal-loss detector. The PHY circuitry is configured to receive a signal from a peer transceiver, to process the received signal in a series of digital PHY-level processing operations, and to output the processed signal for Medium Access Control (MAC) processing. The signal-loss detector is configured to receive, from the PHY circuitry, a digital version of the received signal, and to detect a signal-loss event based on an amplitude of the digital version of the received signal.