Electronics and Telecommunications Research Institute

Dae-Ub Kim

Bheom-Soon Joo

Tae-Sik Cheung

Hae-Won Jung

Jeong-Dong Ryoo

Young-sun Kim

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.

Method and apparatus for protection switching

An Ethernet protection switching method based on a change in link status in a link aggregation sublayer is disclosed. If an Ethernet link aggregation sublayer is present on an Ethernet connection path, a link aggregation sublayer Management Entity Group (MEG) end point is assigned to the Ethernet link aggregation sublayer to generate a link aggregation message for Ethernet connection management and protection switching. When a change in link status is detected in the Ethernet link aggregation sublayer, the link-aggregation-sublayer MEG end point generates and sends the link aggregation message to an MEG end point performing Ethernet connection management and protection switching. Adequate Ethernet protection switching may be performed even in the presence of the link aggregation sublayer.

Protection switching method based on change in link status in ethernet link aggregation sublayer

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.

Data receiving apparatus capable of compensating for reduced timing margin caused by inter-symbol interference and method thereof

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.

Growing community of inventors

Daejeon-si, South Korea

Dae-Ub Kim