Patents by Inventor Tak-Lap Tsui
Tak-Lap Tsui has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 9267984Abstract: Aspects of the present disclosure provide for a cable tester that tests a cable to determine the cable length. The cable tester can include a clock generator that generates a clock that has clock period that is a multiple of the data symbol period and a signal generator that injects the training signal, which can be synchronous with the clock, into the cable. The cable tester can also include a receiver that samples the returned signal from the cable and adaptively filters the returned signal based on the training signal and a controller that determines the cable length from the adaptive filter tap coefficients.Type: GrantFiled: March 7, 2014Date of Patent: February 23, 2016Assignee: Marvell World Trade Ltd.Inventors: Ozdal Barkan, William Lo, Tak-Lap Tsui
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Patent number: 9148200Abstract: A system and method of determining an unbalanced current condition in Power over Ethernet applications are disclosed. In some implementations, a user or network administrator may be notified of potential impairments due to unbalanced current.Type: GrantFiled: November 18, 2013Date of Patent: September 29, 2015Assignee: Marvell International Ltd.Inventors: Tak-Lap Tsui, Runsheng He, Ozdal Barkan, Dance Wu
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Patent number: 8669767Abstract: Aspects of the present disclosure provide for a cable tester that tests a cable to determine the cable length. The cable tester can include a clock generator that generates a clock that has clock period that is a multiple of the data symbol period and a signal generator that injects the training signal, which can be synchronous with the clock, into the cable. The cable tester can also include a receiver that samples the returned signal from the cable and adaptively filters the returned signal based on the training signal and a controller that determines the cable length from the adaptive filter tap coefficients.Type: GrantFiled: August 5, 2013Date of Patent: March 11, 2014Assignee: Marvell International Ltd.Inventors: Ozdal Barkan, William Lo, Tak-Lap Tsui
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Patent number: 8670335Abstract: Reduced power transmission is described. In embodiments, networked devices communicate via a network connection. A characteristic of the network connection between the networked devices can be determined, and an output amplitude of a signal that is indicative of the communications between the network devices can be adjusted based on the characteristic of the network connection. Power consumption that is utilized for the communications between the network devices is reduced based on the adjustment of the output amplitude of the signal.Type: GrantFiled: March 31, 2009Date of Patent: March 11, 2014Assignee: Marvell World Trade Ltd.Inventors: Ozdal Barkan, Tak-Lap Tsui
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Patent number: 8588705Abstract: A system and method of determining an unbalanced current condition in Power over Ethernet applications are disclosed. In some implementations, a user or network administrator may be notified of potential impairments due to unbalanced current.Type: GrantFiled: November 25, 2008Date of Patent: November 19, 2013Assignee: Marvell International Ltd.Inventors: Tak-Lap Tsui, Runsheng He, Ozdal Barkan, Dance Wu
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Patent number: 8513952Abstract: Aspects of the present disclosure provide for a cable tester that tests a cable to determine the cable length. The cable tester can include a clock generator that generates a clock that has clock period that is a multiple of the data symbol period and a signal generator that injects the training signal, which can be synchronous with the clock, into the cable. The cable tester can also include a receiver that samples the returned signal from the cable and adaptively filters the returned signal based on the training signal and a controller that determines the cable length from the adaptive filter tap coefficients.Type: GrantFiled: December 9, 2008Date of Patent: August 20, 2013Assignee: Marvell International Ltd.Inventors: Ozdal Barkan, William Lo, Tak-Lap Tsui
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Patent number: 7977951Abstract: A first physical layer (PHY) device includes an auto-negotiation module, a first cable-length measuring module, and a first control module. The auto-negotiation module exchanges data rates of the first PHY device and a second PHY device. The first PHY device is connected to the second PHY device by a cable. The first cable-length measuring module performs a first measurement of a length of the cable. The first control module selectively receives a second measurement of the length of the cable from the second PHY device, and selects a data rate of the first PHY device from the data rates of the first PHY device and the second PHY device based on (i) the first measurement of the length of the cable performed by the first cable-length measuring module of the first PHY device, or (ii) the second measurement of the length of the cable received from the second PHY device.Type: GrantFiled: October 4, 2010Date of Patent: July 12, 2011Assignee: Marvell International Ltd.Inventors: William Lo, Tak-Lap Tsui
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Patent number: 7808249Abstract: A physical layer (PHY) device of a network device includes a first module, a first cable-length measuring (CLM) module, and a first control module. The first module determines whether a remote PHY that communicates with the PHY device over a cable is capable of measuring a length of the cable. The first CLM module measures a first length of the cable. The first control module causes the first length to be transmitted to the remote PHY, receives a second length of the cable measured by the remote PHY, and adjusts an operating parameter of the PHY based on at least one of the first and second lengths.Type: GrantFiled: February 22, 2008Date of Patent: October 5, 2010Assignee: Marvell International Ltd.Inventors: William Lo, Tak-Lap Tsui
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Publication number: 20090252054Abstract: Reduced power transmission is described. In embodiments, networked devices communicate via a network connection. A characteristic of the network connection between the networked devices can be determined, and an output amplitude of a signal that is indicative of the communications between the network devices can be adjusted based on the characteristic of the network connection. Power consumption that is utilized for the communications between the network devices is reduced based on the adjustment of the output amplitude of the signal.Type: ApplicationFiled: March 31, 2009Publication date: October 8, 2009Inventors: Ozdal Barkan, Tak-Lap Tsui
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Patent number: 6490279Abstract: This invention discloses an improved address table apparatus that includes an address bus for receiving input data packets and for hashing a designated bucket number and extracting a key from each of the data packets. The address table apparatus further includes a plurality of memory banks connected to the address bus wherein each memory bank includes a plurality of memory buckets for storing a designation address (DA) and a port number in each of the buckets. The address table apparatus further includes a comparand bus connected to the address bus for receiving the key therefrom. The address table apparatus further includes a plurality of comparators each corresponding to one of the memory banks for receiving the designation address (DA) and the port number from the designated bucket from a corresponding memory bank. The comparators further connected to the comparand bus for receiving and comparing the key to the address from the designated bucket in each of the memory banks.Type: GrantFiled: July 23, 1998Date of Patent: December 3, 2002Assignee: Advanced Communication Device, Inc.Inventors: Honglu Chen, Ying Wang, Tak-Lap Tsui
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Patent number: 6347089Abstract: The present invention includes an Ethernet frame switching system for receiving and transmitting data frames from and to a plurality of ports. The frame switching system includes a plurality of port control units for managing the transmission and reception procedural processes with a physical layer device. The frame switching system further includes a queue management unit (QMU) connected with data buses to the port control unit. The data frames received from or transmitted to the port control unit are managed by the QMU that these data frames received are transmitted directly to and data frame for transmission or retrieved directly from a single shared data frame buffer such that the local data frame buffer is not required in each of the port control units.Type: GrantFiled: July 1, 1998Date of Patent: February 12, 2002Assignee: Advanced Communication Devices Corp.Inventors: Tak-Lap Tsui, Jun Yu, Lian-Sheng Xie