Abstract: 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.

Abstract: There is provided a packet processing apparatus for transmitting packets received from a plurality of networks through a Label Switched Path (LSP), the packet processing apparatus including: a packet classifier to classify a received packet to a control packet or a normal packet based on port information included in field information of the received packet, and to decide, if the received packet is a normal packet, a service type for transmitting the normal packet according to whether the normal packet is a reception packet or a transmission packet; and a packet processor to acquire LSP condition information or address information from the field information of the normal packet, and to transmit the received packet and update the header or address information of the received packet, according to the service type decided by the packet classifier, with reference to the LSP condition information or the address information.

Abstract: A method and system for protection switching in Ethernet rings are disclosed. The method for protection switching in Ethernet rings includes: receiving a server signal fail (SSF), an Ethernet lower layer fault signal, a remote defect indication (RDI) for informing a different port about a fault state when a uni-directional fault is generated, and ring-automatic protection switching (R-APS) information for requesting Ethernet ring protection switching; comparing the SSF, the RDI, and the R-APS information, and setting states of the first and second Ethernet rings; determining a protection switching priority level of each of the first and second Ethernet rings according to the states of the first and second Ethernet rings; and performing protection switching on the first and second Ethernet rings according to their protection switching priority levels.

Abstract: 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.

Abstract: 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.

Abstract: Provided is a cross flow parallel processing method and system that may process multiple data flows and increase a parallel processing rate in a multi-processor that processes multiple cross data flows.

Abstract: 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.

Abstract: 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.

Abstract: A method and system for protection switching in Ethernet rings are disclosed. The method for protection switching in Ethernet rings includes: receiving a server signal fail (SSF), an Ethernet lower layer fault signal, a remote defect indication (RDI) for informing a different port about a fault state when a uni-directional fault is generated, and ring-automatic protection switching (R-APS) information for requesting Ethernet ring protection switching; comparing the SSF, the RDI, and the R-APS information, and setting states of the first and second Ethernet rings; determining a protection switching priority level of each of the first and second Ethernet rings according to the states of the first and second Ethernet rings; and performing protection switching on the first and second Ethernet rings according to their protection switching priority levels.

Abstract: An apparatus and method for measuring frame loss in multicast service traffic are provided. The method of measuring frame loss includes: counting the number of data frames of a predetermined multicast service flowing into an object network of frame loss measurement; counting the number of data frames of the predetermined multicast service flowing out of the network; and measuring frame loss by comparing the counted number of incoming frames and the counted number of outgoing frames. According to the method and apparatus, in a multicast service environment which is dynamically changing, frame loss of a predetermined multicast service can be conveniently and easily measured.

Abstract: Provided are a data receiving apparatus that can determine data by adjusting a reference level for determining a logic value of inputted data based on Inter-Symbol Interference in a data signal inputted through a transmission line, and receive the data without errors by compensating for timing margin decrease caused by the inter-symbol interference, and a method thereof. The apparatus includes: a reference generator for monitoring the level of an inputted data signal or generating reference levels according to an external control command; a comparator for comparing the inputted data with the reference levels and determining logic values of the inputted data; a selector for selecting the logic values of the inputted data as a valid logic value; and a selection controller for monitoring the valid logic value of the selector, transmitting a selection control signal to the selector, and controlling a process for selecting the valid logic value.

Abstract: Provided is an Ethernet port apparatus supporting multiple physical media, a physical medium managing method, and a switching system using the same. The Ethernet port apparatus of the present research can use and manage multiple transmission media by freely selecting and exchanging the transmission media in a system using an Ethernet port. The Ethernet port apparatus supporting multiple physical media, which includes: a main board unit for supporting hot swap and power supply; a detachable physical medium-based sub-board unit for generating a control signal, transmitting the control signal to the main board means, performing a transceiving function suitable for the desired physical medium; and a physical medium support fixing unit for transmitting variable power, a power control signal, a physical medium control signal, a physical medium state information, and physical medium-dependent bitstream between the main board unit and the sub-board unit.

Abstract: 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.

Abstract: Provided are a clock signal selecting apparatus and method that can guarantee the continuity of an output clock signal. The clock signal selecting apparatus and method can synchronize the phases of at least two clock signals by continuously controlling the phases of the clock signals. Accordingly, even when an active clock signal and a standby clock signal have different frequencies, it is possible to guarantee the continuity of the output clock signal regardless of whether the clock signals are switched from one to another. In addition, it is possible to guarantee the stability of the output clock signal.

Abstract: A multi-functional switch fabric apparatus and a control method for a multi-functional switch fabric apparatus are provided. The multi-functional switch fabric apparatus includes a plurality of input data processors, which copy, distribute, switch, and output input user data according to a mode set signal from the outside, a switch fabric unit, which includes a plurality of switching units and selectively outputs the user data input from the plurality of input data processors according to the mode set signal, a plurality of output data processors, which buffer, schedule, multiplex, and output the user data input from the switch fabric unit, and a control unit, which outputs the mode set signal to control the plurality of input data processors, the switch fabric unit, and the plurality of output data processors.

Abstract: Provided are a data transceiver and method for performing equalization and pre-emphasis adaptive to the transmission characteristic of a transmitting part. The transceiver measures the signal attenuation characteristic of a transmission line of a receiving part using an input data signal input via the transmission line of the receiving part, decodes the distorted waveform of the input data signal, distorts the waveform of an output data signal beforehand using the measured signal attenuation characteristic of the transmission line of the receiving part, and transmits the output data signal via a transmission line of a transmitting part. Thus, when the output data signal is transmitted via the transmission line of the transmitting part, the waveform of the signal remains optimized.

Abstract: Provided are a data receiving apparatus that can determine data by adjusting a reference level for determining a logic value of inputted data based on Inter-Symbol Interference in a data signal inputted through a transmission line, and receive the data without errors by compensating for timing margin decrease caused by the inter-symbol interference, and a method thereof. The apparatus includes: a reference generator for monitoring the level of an inputted data signal or generating reference levels according to an external control command; a comparator for comparing the inputted data with the reference levels and determining logic values of the inputted data; a selector for selecting the logic values of the inputted data as a valid logic value; and a selection controller for monitoring the valid logic value of the selector, transmitting a selection control signal to the selector, and controlling a process for selecting the valid logic value.

Abstract: Provided is an Ethernet port apparatus supporting multiple physical media, a physical medium managing method, and a switching system using the same. The Ethernet port apparatus of the present research can use and manage multiple transmission media by freely selecting and exchanging the transmission media in a system using an Ethernet port. The Ethernet port apparatus supporting multiple physical media, which includes: a main board unit for supporting hot swap and power supply; a detachable physical medium-based sub-board unit for generating a control signal, transmitting the control signal to the main board means, performing a transceiving function suitable for the desired physical medium; and a physical medium support fixing unit for transmitting variable power, a power control signal, a physical medium control signal, a physical medium state information, and physical medium-dependent bitstream between the main board unit and the sub-board unit.

Abstract: Provided are a clock signal selecting apparatus and method that can guarantee the continuity of an output clock signal. The clock signal selecting apparatus and method can synchronize the phases of at least two clock signals by continuously controlling the phases of the clock signals. Accordingly, even when an active clock signal and a standby clock signal have different frequencies, it is possible to guarantee the continuity of the output clock signal regardless of whether the clock signals are switched from one to another. In addition, it is possible to guarantee the stability of the output clock signal.

Abstract: A multi-functional switch fabric apparatus and a control method for a multi-functional switch fabric apparatus are provided. The multi-functional switch fabric apparatus includes a plurality of input data processors, which copy, distribute, switch, and output input user data according to a mode set signal from the outside, a switch fabric unit, which includes a plurality of switching units and selectively outputs the user data input from the plurality of input data processors according to the mode set signal, a plurality of output data processors, which buffer, schedule, multiplex, and output the user data input from the switch fabric unit, and a control unit, which outputs the mode set signal to control the plurality of input data processors, the switch fabric unit, and the plurality of output data processors.