Abstract: Provided is a smart mobility link system which provides a travel path through a vehicle terminal installed in a vehicle up to a location at which parking is allowed, and mobility is relayed to a vehicle-carried moving object terminal which is installed in a vehicle-carried moving object over a remaining distance so that the travel path can be continuously provided. Accordingly, a user can be guided through a travel path even in an area in which vehicle travel is not possible without additional manipulation of the user.

Abstract: Provided is a smart mobility link system which provides a travel path through a vehicle terminal installed in a vehicle up to a location at which parking is allowed, and mobility is relayed to a vehicle-carried moving object terminal which is installed in a vehicle-carried moving object over a remaining distance so that the travel path can be continuously provided. Accordingly, a user can be guided through a travel path even in an area in which vehicle travel is not possible without additional manipulation of the user.

Abstract: An Ethernet-based optical transmission system, and particularly, an apparatus and method for controlling a remote optical Ethernet device. An optical Ethernet apparatus includes a system recovery processor configured to output a system reset signal or a system power ON/OFF control signal and a system recovery controller configured to detect a system recovery command that occurs when a predetermined signal pattern is repeated the designated number of times for a designated period of time, and to control the system recovery processor using the detected system recovery command.

Abstract: An Ethernet-based optical transmission system, and particularly, an apparatus and method for controlling a remote optical Ethernet device. An optical Ethernet apparatus includes a system recovery processor configured to output a system reset signal or a system power ON/OFF control signal and a system recovery controller configured to detect a system recovery command that occurs when a predetermined signal pattern is repeated the designated number of times for a designated period of time, and to control the system recovery processor using the detected system recovery command.

Abstract: A method for protection switching in an Ethernet ring network is provided. According to an aspect, the protection switching method includes: at a first node on the Ethernet ring network, detecting link failure; at the first node, determining whether a port through which a protection switching message has to be transmitted is on a forwarding path; and at the first node, generating a protection switching message based on the result of the determination; and at the first node, transmitting the protection switching message.

Abstract: A network switch is disclosed, where predetermined terminals are connected to respective ports. The network switch includes an address setter that transmits an address including a physical address to be allocated to the terminals connected to the respective ports, and an address setting command through a corresponding port.

Abstract: A virtual local area network (VLAN) system that uses an energy saving path includes a terminal which data is input to and output from by a user, a first switch configured to connect the terminal to a network, and a plurality of second switches connected to the first switch to form a trunk link. When traffic load on at least one of the plurality of second switches is less than a lower threshold in a situation in which packets are transmitted using an such that the packets are concentrated on a specific path of the trunk link.

Abstract: Provided are an apparatus and method for time synchronization in a Precision Time Protocol (PTP) network. According to an aspect, there is provided a time synchronization apparatus including: a synchronization unit configured to perform time synchronization between a master and at least one slave based on the number of synchronization messages that are sent from the master; a state-of-synchronization determiner configured to measure performance of the synchronization to thereby determine the state of the synchronization; and a number-of-messages adjustor configured to adjust the number of synchronization messages based on the state of the synchronization. Therefore, by automatically adjusting the number of synchronization messages that are sent from a master according to network traffic, the states of slave nodes, etc., it is possible to minimize entire network traffic and optimize the synchronization performance of nodes.