Electronics and Telecommunications Research Institute

Hae Won Jung

Hyeong Ho Lee

Do Young Kim

Dae-Ho Kim

Tae-Gyu Kang

Tae Il Kim

Sung Soo Kang

Ki-Jong Koo

Bheom Soon Joo

Do Yeon Kim

Young Sun Kim

Chang Ho Choi

Sang Min Lee

Yoo Hwa Kang

Kyeong Ho Lee

Joo Myoung Seok

Seong Yong Lim

Tae Sik Cheung

Byungjun Ahn

Tae Gyu Kang

Daeub Kim

Dae Young Kim

Hae Sook Jeon

Jong Hyup Lee

Jung Whan Kim

Mi Jung Yang

Kyeseon Lee

Dae Up Kim

Changoo Lee

Jae Jeong Lee

Provided is a transmission apparatus for matching sound quality measurement sections of a variable bandwidth multi-codec. The apparatus includes a measurement section setting unit setting a measurement section, which is to be measured for sound quality, in units of time; a first conversion unit converting the measurement section into a measurement section in units of samples; and an information synthesis unit synthesizing information regarding the measurement section in units of samples with a digital original sound and outputting the synthesis result. In addition, provided is a method of matching a measurement section of a reference sound, based on which the end-to-end sound quality measurement of the variable bandwidth multi-codec is performed, and a measurement section of a sound produced by the variable bandwidth multi-codec in a real-time Internet multimedia service. Therefore, distortion of measurement results due to un-matching measurement sections can be reduced.

Method and apparatus for matching sound quality measurement sections of variable bandwidth multi-codec

Provided are a method and apparatus for measuring sound quality in a variable band multi-codec. The sound quality measurement apparatus includes: a recording file receiving/generating unit receiving a first recording file in which a natural sound is recorded, and a second recording file obtained by converting the natural sound into digital data using the variable band multi-codec, receiving information obtained by encoding the natural sound using the variable band multi-codec, in the format of a Real Time Protocol (RTP) packet, unpacking the RTP packet, decoding the RTP packet using the variable band multi-codec, and generating a third recording file; a Mean Opinion Score (MOS) value calculating unit repeatedly selecting a file from among the first recording file, the second recording file, and the third recording file, or selecting two files from among the first recording file, the second recording file, and the third recording file, and calculating a MOS value by obtaining a difference between the selected results; and a MOS value comparison unit comparing a plurality of MOS values generated by the MOS value calculating unit, with each other, and detecting a cause of sound quality deterioration.

Apparatus and method for measuring quality of sound encoded with a variable band multi-codec

A method and apparatus for controlling a variable bit-rate voice codec are provided. The method of controlling the variable bit-rate voice codec may include: extracting calling capability of terminals that request a new call to be made; extracting network parameters from existing calls in the network through an exchanged packet; measuring voice quality of the existing calls based on the extracted network parameters; and determining whether to permit a new call to be made based on the measured voice quality and the calling capability. Accordingly, it is possible to secure QoS of a voice service between terminals by adjusting a transmission rate of the variable bit-rate codec based on transmission capability of a network.

Method and apparatus for controlling variable bit-rate voice codec

An apparatus and method of variable bandwidth multi-codec quality of service (QoS) control are provided. The apparatus for controlling the QoS of a variable bandwidth multi-codec includes: a network state detection unit detecting a network state including at least one of a packet loss ratio, a packet loss interval, and a packet delay time based on an RTP packet transmitted to and received from a destination for which a call connection is established; and a codec control unit updating a transmission rate by comparing the detected resultant value with an already set reference value and increasing or decreasing the transmission rate, and controlling the variable bandwidth multi-codec to code data with the updated transmission rate. According to the apparatus and method, data can be coded with a codec transmission rate suitable for a network state identified during a voice call after the call is set up.

Apparatus and method of variable bandwidth multi-codec QoS control

A method of providing multicast services in a virtual private local area network (LAN) is provided. The method of providing multicast services, which is used by a provider edge in a virtual private LAN in which the provider edge, a customer edge, and a management system are connected to each other, includes: establishing a VPLS table used to transmit a received Ethernet frame to a destination; after receiving an Ethernet frame from the customer edge, searching the VPLS table in order to determine whether or not group information related to the destination of the Ethernet frame exists in the VPLS table; if the group information does not exist, requesting the group information from the management system, receiving the information, and then, updating the VPLS table by adding the received group information; and determining an output interface by referring to the group information, and transmitting the Ethernet frame. According to the method, when multicast traffic, such as Internet protocol (IP) broadcasting, is transmitted in a VPLS network, the VPLS management system for managing groups of customers is linked, thereby solving the problem that multicast traffic is transmitted to unauthorized customers.

Method of providing multicast services in virtual private LAN

Provided is an operational status testing apparatus and method for an Ethernet-based APS process. A test command signal which contains a command to perform an operational test for the APS process of a first node and a second test response signal that indicates that the operation of the APS process of a second node is performed normally, from among far end request signals that are received from the second node connected to own first node via an Ethernet network, are filtered. When the far end request signals are test command signals, a first test response signal that indicates that the operation of the APS process of the first node is performed normally is generated, and a top priority local request signal is selected based on priorities of the first test response signal and at least one local request signal that indicates the status of the APS process of the first node, and an output signal to be transmitted to the second node is determined based on priorities of the top priority local request signal and the filtered the far end request signal. The function for testing the operational status for the APS process defined in ITU-T recommendation G.8031 is embodied, and when an operational status test request is received from another node, the APS process can be tested effectively without having to perform a complicated diagnosis operation for the APS process.

Operational status testing apparatus and method for Ethernet-based automatic protection switching process

Provided is a network resource provisioning method for bandwidth guarantee per flow in a differentiated service Internet in which bandwidth needed for each flow is individually requested. The method includes setting an optimum path between a source node and a destination node based on a request for traffic for a specific period of time; performing static provisioning in which bandwidth is allocated to the optimum path according to a service class thereof; determining whether all of the bandwidth allocated to the optimum path by performing static provisioning are used up, and accepting connection admission according to the determination result; and when connection admission is not accepted, performing dynamic provisioning in which additional bandwidth is allocated to the optimum path based on a request for traffic from a new incoming flow. Accordingly, it is possible to efficiently provide a quality-guaranteed service by accepting a request for bandwidth per flow.

Network resource provisioning method for bandwidth guarantee per flow

An address resolution protocol (ARP) processing method for Ethernet matching is provided in which a message authentication code (MAC) request message including IP information is received from another application module and provides a MAC corresponding to the MAC request message, the method including: determining whether a MAC matching the IP information included in the MAC request message is stored; determining whether the MAC request message includes Ethernet over synchronous optical network/synchronous digital hierarchy (SONET/SDH) (EoS) channel information; if it is determined that the MAC request message does not include EoS channel information, detecting EoS channel information that is previously stored and that matches the IP information; and broadcasting an ARP request message to an external host via an EoS channel. The ARP processing method is performed using the EoS channel, thereby reducing unnecessary broadcast traffic packets.

Address resolution protocol (ARP) processing method for Ethernet matching

Provided are an apparatus for multiplexing Gigabit Ethernet frames and an apparatus for demultiplexing 10-Gigabit Ethernet frames. The apparatus for multiplexing Gigabit Ethernet frames includes at least one pre-processing unit, a multiplexing unit, an SDR/DDR conversion unit, and a control unit. The at least one pre-processing unit receives Gigabit Ethernet frames, converts the Gigabit Ethernet frames into 10-Gigabit Ethernet frames, and outputs the 10-Gigabit Ethernet frames. The multiplexing unit receives the 10-Gigabit Ethernet frames, time division multiplexes the 10-Gigabit Ethernet frames in frame units, and outputs the time division multiplexed 10-Gigabit Ethernet frames as first data. The SDR/DDR conversion unit, which converts the first data into second data having two 32-bit bus structures and outputs the second data. The control unit outputs a first control signal in response to an output request of the pre-processing unit.

Apparatus for multiplexing Gigabit Ethernet frame and apparatus for demultiplexing 10-Gigabit Ethernet frame

Provided are an apparatus and method of dividing virtual sites using policy properties in multiprotocol label switching (MPLS) networks. In this method, when multiple virtual sites are selected with respect to one interface, not only usually used source IP addresses and VLAN tags but also TOS fields and MPLS labels are used so that more various kinds of virtual sites can be selected. Also, since the TOS fields and MPLS labels can express additional QoS-related information, differentiated services can be provided by selecting a wider variety of kinds of virtual sites.

Apparatus and method of designating virtual sites using policy informations in multiprotocol label switching networks

Disclosed herein is a 10-gigabit Ethernet line interface apparatus and method of controlling the same. The apparatus has N network processors, a frame multiplexing and demultiplexing block, a 10-gigabit extender sublayer processing block, a 10-gigabit Ethernet physical layer processing block, a 10-gigabit physical layer control logic, a line interface control logic, and a line processor. The N network processors are connected to the switch fabric unit. The frame multiplexing and demultiplexing block provides GMII and XGMII between the N network processors and a 10-gigabit extender sublayer processing block. The present invention can improve transmission speed and packet processing performance of a physical layer to a 10 Gbps level while maintaining basic frame standards of a 1-gigabit Ethernet switch apparatus.

10-gigabit Ethernet line interface apparatus and method of controlling the same

Provided is an apparatus for providing a system clock synchronized to a network universally. The apparatus includes a network synchronization reference signal generating unit that outputs a reference signal for network synchronization; a network synchronization controller that generates a first control voltage that allows a first clock pulse to be in synchronization with the reference signal for network synchronization; an OVCXO that generates the first clock pulse by application of the first control voltage; a system synchronization reference signal generator that generates reference signals for system synchronization; a system synchronization controller that generates a second control voltage that allows the system clock to be in synchronization with the reference signal for system synchronization; a VCO that generates a second clock pulse by application of the second control voltage; and a system clock generator that outputs the system clock. Accordingly, it is possible to apply to systems requiring network synchronization.

Apparatus for providing system clock synchronized to a network universally

An apparatus, a method and a storage medium for carrying out a deskew among multiple lanes for use in a division transmission of large-capacity data. The method comprises the steps of detecting alignment characters from data streams on a lane-by-lane basis, determining whether a skew among the lanes is generated by comparing reception points of the alignment characters for respective lanes, if the skew among the lanes is generated, storing the alignment characters in a first storage column of a shift register on the lane-by-lane basis and storing data being subsequent to the alignment characters in a second storage column, at a time of a last alignment character detection, setting a last storage section on the lane-by-lane basis and indicating an alignment completion, shifting the data to output the data stored in the first storage column when the data is inputted into the last storage section, and intactly outputting the data streams before the deskew is completely accomplished in the storage device and outputting the aligned data streams after the deskew is completely accomplished.

Apparatus, method and storage medium for carrying out deskew among multiple lanes for use in division transmission of large-capacity data

The present invention provides an Ethernet switching apparatus using frame multiplexing and demultiplexing. The Ethernet switching apparatus has a plurality of frame demultiplexers, a plurality of frame multiplexers and a switch fabric chip set. The frame demultiplexers convert at least one 10 gigabits Ethernet frame into a plurality of gigabit Ethernet frames. The frame multiplexers convert a plurality of gigabit Ethernet frames into at least one 10 gigabits Ethernet frame. The switch fabric chip set is provided with input and output interfaces using the GMII, and is connected to the frame demultiplexers and the frame multiplexers in the GMII format. The switch fabric chip set outputs frames through an arbitrary usable one of a plurality of GMII ports connected to a corresponding frame multiplexer if the frames are transmitted to the corresponding frame multiplexer.

Ethernet switching apparatus and method using frame multiplexing and demultiplexing

An apparatus for managing Ethernet physical layer registers and a method thereof are provided. The apparatus comprises a central processing unit (CPU) with an external bus interface function, and an interface conversion unit which is connected to the CPU through the external bus interface, converts the external bus interface into management data input/output (MDIO) interface and performs communications with the physical layer apparatus.

Growing community of inventors

Daejeon, South Korea

Hae Won Jung