Abstract: The Ethernet packet transmission apparatus includes: a packet transceiving unit for transceiving an Ethernet packet through a plurality of Ethernet ports; a MAC header processing unit for receiving the Ethernet packet and reading header information; a packet processing unit for receiving the Ethernet packet, classifying the received Ethernet packet on a service or destination basis, assigning a priority label to the classified Ethernet packet on a packet-by-packet basis, and outputting memory state information on the corresponding port; a congestion controlling unit for controlling a position in an output sequence of the Ethernet packet; and a signal processing unit for receiving and comparing the port state information and the memory state information and outputting either a memory control signal or a congestion control signal to control the packet processing unit and the congestion controlling unit.

Abstract: Provided is an apparatus for guaranteeing the performance of Ethernet packets in an Ethernet system. A packet sorting unit receives the Ethernet packets, processes header information of the Ethernet packets, and sorts the Ethernet packets. A packet processing unit stores the Ethernet packets, calculates the number of the Ethernet packets, and outputs the Ethernet packets. A packet to synchronous digital hierarchy frame converting unit receives the Ethernet packets output from the packet processing unit, converts the received Ethernet packets into synchronous digital hierarchy frames, calculates the number of the converted frames, maps the frames to a virtual container group, and outputs the virtual container group. And a signal processing unit measures the performance of the Ethernet packets on the basis of the number of the Ethernet packets stored in the packet processing unit and the number of the frames, and outputs the first and second control signals.

Abstract: Provided are a method and apparatus for transmitting error information between an Ethernet network and a synchronous digital hierarchy (SDH) network. According to the present invention, when an error occurs in the Ethernet network or the SDH network, OAM information is transferred to the opposite network by using a conventional MAC control frame from a linked part of the Ethernet network and the SDH network and thus the EoS network may be efficiently operated and managed. Also, by using standardized MAC control frame, the present invention may be applied to an existing system without additionally changing hardware or defining a new OAM frame.

Abstract: An apparatus and method for guaranteeing a service specific bandwidth in an Ethernet frame transmission system. In the method, memory status information of an input frame buffer and usable bandwidth information of a present Ethernet network are obtained if congestions or errors occur in the Ethernet frame transmission system. Then, different pause times by service specific priorities are set based on the memory status information and the usable bandwidth information. A MAC control frame including the pause frame is provided to the corresponding adjacent nodes. A media access control processor, if the received Ethernet frame is the MAC control frame, detects the pause times by priorities in the detected pause frame. A single processor generates drop information by priorities. A network processor drops a corresponding Ethernet frame according to the drop information by priorities, which is generated from the signal processor.

Abstract: An optical channel power equalizer for equalizing the per-channel power levels of a multi-channel optical signal is provided. The channel power equalizer includes an optical spectrum measurement unit that extracts a portion of the amplified optical signal and measures the per-channel power levels of the extracted optical signal; a controller that compares the measured power levels with a predetermined reference value, and determines to output the degrees of attenuation per channel based on differences between the measured per-channel power levels and the reference value; and a per-channel optical attenuation unit that attenuates the per-channel power levels of a plurality of input optical signals based on the degrees of attenuation and outputs the attenuated optical signals as the plurality of channels.

Abstract: The optical performance monitoring apparatus includes a first optical distributor for distributing a WDM optical signal branched from an optical transmission line, a plurality of wavelength selectors, each for selecting a predetermined wavelength optical signal from the optical signal distributed, a plurality of first optical detectors, each for detecting power of the predetermined wavelength optical signal for a corresponding one of channels selected by the wavelength selectors; and a signal processor for measuring the power for each channel of the WDM optical signal, a total ASE noise power, and an optical signal-to-noise ratio for each channel from the digital value.

Abstract: An optical signal performance monitoring apparatus in a multi-channel optical transmission system and a method for monitoring the optical signal performance.

Abstract: An optical channel power equalizer for equalizing the per-channel power levels of a multi-channel optical signal is provided. The channel power equalizer includes an optical spectrum measurement unit that extracts a portion of the amplified optical signal and measures the per-channel power levels of the extracted optical signal; a controller that compares the measured power levels with a predetermined reference value, and determines to output the degrees of attenuation per channel based on differences between the measured per-channel power levels and the reference value; and a per-channel optical attenuation unit that attenuates the per-channel power levels of a plurality of input optical signals based on the degrees of attenuation and outputs the attenuated optical signals as the plurality of channels.

Abstract: An optical signal performance monitoring apparatus in a multi-channel optical transmission system and a method for monitoring the optical signal performance are provided. To achieve the above objective, the optical signal performance monitoring apparatus in the multi-channel optical transmission system includes; an optical input unit for controlling the spot size of an inputted multi-channel optical signal and generating the 1st multi-channel beam; an optical collimation and focusing unit for collimating the 1st multi-channel beam and focusing the 2nd multi-channel beam which is divided by wavelength; a diffraction and reflection unit for diffracting and reflecting the 1st collimated multi-channel beam, and generating the 2nd multi-channel beam which is divided by wavelength and is in parallel with the 1st collimated multi-channel beam; an optical detection unit for measuring the intensity of the 2nd multi-channel beam by wavelength, which is focused by wavelength by the optical collimation and focusing unit.

Abstract: An optical packet header processing apparatus for processing a header of an optical packet expressing an address of a destination node to control a switching operation of an optical packet switch. The optical packet header processing apparatus comprises a beam splitter for splitting the optical packet header into a predetermined number of optical packet header elements, and a plurality of time interval detectors. Each of the time interval detectors receives a corresponding one of the optical packet header elements from the beam splitter and outputs a detect optical pulse if a pair of optical pulses having a predetermined time interval therebetween are present in the received optical packet header element. A plurality of optical pulse detectors are adapted to convert the detect optical pulses from the time interval detectors into electrical signals and transfer the converted electrical signals to the optical packet switch, respectively.

Abstract: The present invention is to provide an automatic gain-controlled optical fiber amplifier, comprising: a first optical branch for branching a portion of an optical signal inputted into the optical fiber amplifier; a second optical branch for branching a portion of an optical signal outputted from the optical fiber amplifier; an optical distributor for receiving the optical signal of an input side branched partially by the first optical branch and for outputting it separately; a first wavelength selector for receiving the optical signal of a one side distributed by the optical distributor and for selecting a predetermined wavelength optical signal; a second wavelength selector for receiving the optical signal of an output side branched partially by the second optical branch and for selecting the predetermined wavelength optical signal; a signal processor for receiving the optical signal of a second side distributed by the optical distributor and the predetermined wavelength optical signal selected by the first

Abstract: The optical performance monitoring apparatus includes a first optical distributor for distributing a WDM optical signal branched from an optical transmission line, a plurality of wavelength selectors, each for selecting a predetermined wavelength optical signal from the optical signal distributed, a plurality of first optical detectors, each for detecting power of the predetermined wavelength optical signal for a corresponding one of channels selected by the wavelength selectors; a second optical detector for detecting total power of the optical signal, a plurality of second optical distributors, each for transmitting the optical signal outputted from the first optical distributor to the corresponding one of the wavelength selectors and transmitting the predetermined wavelength optical signal selected by the corresponding one of the wavelength selectors to the corresponding one of the first detectors, a selector for selecting one of the powers of the optical signals detected by the first optical detectors and

Abstract: The present invention is to provide an automatic gain-controlled optical fiber amplifier, comprising: a first optical branch for branching a portion of an optical signal inputted into the optical fiber amplifier; a second optical branch for branching a portion of an optical signal outputted from the optical fiber amplifier; a optical distributor for receiving the optical signal of an input side branched partially by the first optical branch and for outputting separately it; a first wavelength selector for receiving the optical signal of an one side distributed by the optical distributor and for selecting a predetermined wavelength optical signal; a second wavelength selector for receiving the optical signal of an output side branched partially by the second optical branch and for selecting the predetermined wavelength optical signal; a signal processor for receiving the optical signal of a second side distributed by the optical distributor and the predetermined wavelength optical signal selected by the first