Patents by Inventor Tae Sik Cheung
Tae Sik Cheung 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: 10659374Abstract: A frame transmission controlling apparatus includes: a list configuration unit managing a parameter related to a gate control; a cycle timer unit managing a start timing of a cycle; a list executing unit performing the gate control based on the parameter, wherein the list executing unit includes: a cycle executing state machine setting an expiration time of at least one section included in the cycle, checking gate operation information corresponding to a list pointer indicating the at least one section, and performing a control corresponding to the gate operation information; a delaying state machine deducting and updating the expiration time by a predetermined unit; a cycle holding state machine generating a control signal indicating stopping transmission in MAC; and a cycle releasing state machine generating a control signal indicating resuming the transmission in MAC.Type: GrantFiled: September 27, 2018Date of Patent: May 19, 2020Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTEInventors: Chang Ho Choi, Tae Kyu Kang, Jeong Dong Ryoo, Tae Sik Cheung
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Publication number: 20190104073Abstract: A frame transmission controlling apparatus includes: a list configuration unit managing a parameter related to a gate control; a cycle timer unit managing a start timing of a cycle; a list executing unit performing the gate control based on the parameter, wherein the list executing unit includes: a cycle executing state machine setting an expiration time of at least one section included in the cycle, checking gate operation information corresponding to a list pointer indicating the at least one section, and performing a control corresponding to the gate operation information; a delaying state machine deducting and updating the expiration time by a predetermined unit; a cycle holding state machine generating a control signal indicating stopping transmission in MAC; and a cycle releasing state machine generating a control signal indicating resuming the transmission in MAC.Type: ApplicationFiled: September 27, 2018Publication date: April 4, 2019Inventors: Chang Ho CHOI, Tae Kyu KANG, Jeong Dong RYOO, Tae Sik CHEUNG
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Patent number: 10009272Abstract: Provided is a packet transmission apparatus including at least one user network interface (UNI) line card configured to receive traffic including a client signal, a fabric switch configured to perform switching on the traffic based on a unit of line card, a network-to-network interface working (NNI-W) line card configured to generate a multiprotocol label switching-transport profile (MPLS-TP) working tunnel to transmit the traffic transferred through the fabric switch, and a network-to-network interface protection (NNI-P) line card configured to generate a MPLS-TP protection tunnel to transmit the traffic transferred through the fabric switch when a fault occurs on a path of the NNI-W line card.Type: GrantFiled: May 20, 2016Date of Patent: June 26, 2018Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTEInventors: Won Kyoung Lee, Jeong Dong Ryoo, Tae Sik Cheung
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Patent number: 9806939Abstract: Provided is a linear protection switching method of a node, wherein the method includes selecting a local request based on a priority of at least one local request, determining a global request based on a priority between the selected local request and a remote message, and performing a state transition based on the global request.Type: GrantFiled: October 15, 2014Date of Patent: October 31, 2017Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTEInventors: Dae Ub Kim, Jeong Dong Ryoo, Tae Sik Cheung
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Publication number: 20170229800Abstract: A midplane communication system includes: a midplane; at least one front daughter card configured to connect to a front side of the midplane; at least one rear daughter card configured to connect to a rear side of the midplane in a vertical direction relative to the front daughter card; and an orthogonal connector configured to electrically connect the front daughter card and the rear daughter card, wherein the orthogonal connector is configured to connect to the midplane at a vertical or horizontal offset to include at least one extra connection pin allowing an additional connection when connecting the front daughter card and the rear daughter card.Type: ApplicationFiled: August 15, 2016Publication date: August 10, 2017Inventors: Chang Ho CHOI, Tae Sik CHEUNG, Woo Young CHOI
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Patent number: 9515871Abstract: An apparatus and method for protection switching are disclosed. The protection switching method in accordance with an example of the present disclosure is capable of smoothly processing a protection switching while preventing a data path mismatch occurring in the protection switching in a case in which a forced switching command (FS), which is a passive command, and a signal failure (SF) of a protection path occur at both end nodes, respectively, when a linear protection switching is performed by use of a protection state coordination message in a packet network or a packet transport network.Type: GrantFiled: August 29, 2013Date of Patent: December 6, 2016Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTEInventors: Dae-Ub Kim, Tae-Sik Cheung, Jeong-Dong Ryoo
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Publication number: 20160344630Abstract: Provided is a packet transmission apparatus including at least one user network interface (UNI) line card configured to receive traffic including a client signal, a fabric switch configured to perform switching on the traffic based on a unit of line card, a network-to-network interface working (NNI-W) line card configured to generate a multiprotocol label switching-transport profile (MPLS-TP) working tunnel to transmit the traffic transferred through the fabric switch, and a network-to-network interface protection (NNI-P) line card configured to generate a MPLS-TP protection tunnel to transmit the traffic transferred through the fabric switch when a fault occurs on a path of the NNI-W line card.Type: ApplicationFiled: May 20, 2016Publication date: November 24, 2016Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTEInventors: Won Kyoung LEE, Jeong Dong RYOO, Tae Sik CHEUNG
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Patent number: 9490926Abstract: A processor time synchronization apparatus and method in a data communication system which includes a plurality of processors and line interfaces. The processor time synchronization apparatus includes a first local processor configured to recognize a time difference between an external device and the system based on a time message exchanged with the external device, and synchronize time between the external device and the system, and a second local processor configured to receive time information from the first local processor that has been time-synchronized with the external device, the time information containing the time difference between the external device and the system, and synchronize the first local processor with a system's internal time using the received time information.Type: GrantFiled: November 19, 2013Date of Patent: November 8, 2016Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTEInventors: Bup-Joong Kim, Tae-Sik Cheung, Bheom-Soon Joo, Jong-Hyun Lee
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Publication number: 20160149802Abstract: A communication terminal performing protection switching in a shared mesh network is provided. The communication terminal configured to transmit and receive data traffic associated with a first working path may include a processor configured to encode, in an optical channel data unit (ODU) including the data traffic, a first operation command message to be received from a first end node, and a communicator configured to transmit the ODU to a neighboring node, in which the first end node is present in a second working path.Type: ApplicationFiled: October 29, 2015Publication date: May 26, 2016Inventors: Ji Wook YOUN, Jeong Dong RYOO, Tae Sik CHEUNG, Ho Geon KIM, Seung Woo LEE
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Publication number: 20160142286Abstract: Provided is an operation method of a node, the method including recognizing multiple failures occurring in a protected domain, transmitting a message including failure information, multiple-failure information, and used path information to a second node when the multiple failures are recognized, and performing a protection switching to a used path determined based on a priority for each of the multiple failures.Type: ApplicationFiled: November 19, 2015Publication date: May 19, 2016Inventors: Dae Ub KIM, Jeong Dong RYOO, Tae Sik CHEUNG
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Patent number: 9030925Abstract: A method for protection switching in a shared node where protection resources of a plurality of end-to-end linear protection domain are shared is provided. The shared node receives a first protection switching event message notifying that a protection switching event occurs from a first node of a first end-to-end linear protection domain, and determines whether to prohibit protection switching on a second end-to-end linear protection domain by comparing a priority of the first end-to-end linear protection domain with a priority of the second end-to-end linear protection domain.Type: GrantFiled: December 23, 2010Date of Patent: May 12, 2015Assignee: Electronics and Telecommunications Research InstituteInventors: Tae Sik Cheung, Jeong-dong Ryoo
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Publication number: 20150109900Abstract: Provided is a linear protection switching method of a node, wherein the method includes selecting a local request based on a priority of at least one local request, determining a global request based on a priority between the selected local request and a remote message, and performing a state transition based on the global request.Type: ApplicationFiled: October 15, 2014Publication date: April 23, 2015Inventors: Dae Ub KIM, Jeong Dong RYOO, Tae Sik CHEUNG
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Publication number: 20150098317Abstract: Provided is a protection end node located at an end of a protection path, wherein the protection end node includes a receiver to receive, from a working end node located at an end of a working path, path defect information indicating whether a defect occurs on the working path, a processor to perform protection switching in response to reception of the path defect information and generate path control information used for the working end node to control a connection of the working path based on the protection switching, and a transmitter to transmit the path control information to the working end node.Type: ApplicationFiled: October 6, 2014Publication date: April 9, 2015Inventors: Tae Sik CHEUNG, Jeong Dong RYOO, Dae Ub KIM
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Publication number: 20140328165Abstract: A method of operating a root node in which the root node transmits/receives traffic with a plurality of leaf nodes through a plurality of working paths is disclosed, the method including receiving, from a first leaf node, a first signal failure (SF) message indicating an occurrence of a failure on a first working path of the first leaf node, receiving traffic from the first leaf node by switching the first working path to a first protection path, and receiving traffic from remaining leaf nodes aside from the first leaf node while maintaining the working path.Type: ApplicationFiled: May 5, 2014Publication date: November 6, 2014Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTEInventors: Jeong Dong RYOO, Tae Sik CHEUNG, Dae Ub KIM
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Publication number: 20140328164Abstract: A method of operating a root node in a multipoint-connection with a plurality of leaf nodes, the method including transmitting/receiving traffic with the plurality of leaf nodes via a working path, receiving, from a leaf node, a message indicating an occurrence of a failure on a path of the leaf node from among the plurality of leaf nodes, recognizing an occurrence of a local failure on the path connected to the leaf node, and transmitting information about the failure to the leaf node.Type: ApplicationFiled: April 28, 2014Publication date: November 6, 2014Applicant: Electronics and Telecommunications Research InstituteInventors: Dae Ub KIM, Jeong Dong RYOO, Tae Sik CHEUNG
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Publication number: 20140298070Abstract: A processor time synchronization apparatus and method in a data communication system which includes a plurality of processors and line interfaces. The processor time synchronization apparatus includes a first local processor configured to recognize a time difference between an external device and the system based on a time message exchanged with the external device, and synchronize time between the external device and the system, and a second local processor configured to receive time information from the first local processor that has been time-synchronized with the external device, the time information containing the time difference between the external device and the system, and synchronize the first local processor with a system's internal time using the received time information.Type: ApplicationFiled: November 19, 2013Publication date: October 2, 2014Applicant: Electronics and Telecommunications Research InstituteInventors: Bup-Joong KIM, Tae-Sik CHEUNG, Bheom-Soon JOO, Jong-Hyun Lee
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Publication number: 20140064064Abstract: An apparatus and method for protection switching are disclosed. The protection switching method in accordance with an example of the present disclosure is capable of smoothly processing a protection switching while preventing a data path mismatch occurring in the protection switching in a case in which a forced switching command (FS), which is a passive command, and a signal failure (SF) of a protection path occur at both end nodes, respectively, when a linear protection switching is performed by use of a protection state coordination message in a packet network or a packet transport network.Type: ApplicationFiled: August 29, 2013Publication date: March 6, 2014Applicant: Electronics and Telecommunications Research InstituteInventors: Dae-Ub KIM, Tae-Sik CHEUNG, Jeong-Dong RYOO
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Publication number: 20140036927Abstract: Provided are a forced protection switching method and a forced protection switching clearing method in an Ethernet ring network. When an operator desires to block a port of a specific node for maintenance and repair, the operator gives a forced switching (FS) command to the specific node in order to block the port. When the operator desires to clear FS, the operator gives a clear command to the specific node in order to clear the blocked port. As a result, operation flexibility of the Ethernet ring network is provided.Type: ApplicationFiled: October 15, 2013Publication date: February 6, 2014Applicant: Electronics And Telecommunications Research InstituteInventors: Do Yeon KIM, Tae Sik CHEUNG, Byung Jun AHN, Bong Tae KIM
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Patent number: 8634290Abstract: Provided are a shared mesh protection switching apparatus and method. The shared mesh protection switching apparatus includes a plurality of linear protection switching processors allocated to the linear protection domains respectively and configured to provide a switching report signal in response to fault occurrence in the corresponding linear protection domains or a linear protection switching operation, and perform a function of limiting use of the shared section in response to a provided lock signal, and a mesh protection switching processor configured to select at least one linear protection domain to be limited in use of the network resources of the shared section according to a predetermined reference when the switching report signal is provided and provide the lock signal to a linear protection switching processor corresponding to the at least one selected linear protection domain.Type: GrantFiled: September 30, 2011Date of Patent: January 21, 2014Assignee: Electronics & Telecommunications Research InstituteInventors: Jeong Dong Ryoo, Tae Sik Cheung
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Patent number: 8498314Abstract: Provided is a clock operating method and apparatus for supporting a plurality of Ethernet physical layer interfaces. To provide a network synchronization function in a board of simultaneously accommodating the plurality of Ethernet physical layer interfaces, the clock operating method may include: determining a physical layer interface according to a current network synchronization mode; and generating a clock signal of the determined physical layer interface as a reference signal of another physical layer interface.Type: GrantFiled: September 15, 2010Date of Patent: July 30, 2013Assignee: Electronics and Telecommunications Research InstituteInventors: Woo Young Choi, Tae Sik Cheung, Jea Hoon Yu