Fujitsu Corporation

Hiromichi Makishima

Hiroyuki Honma

Hiroyuki Kitajima

Hidetaka Kawahara

Shingo Hotta

Yuji Obana

Toru Katagiri

Hideo Abe

Hiroyuki Asano

Hiroyuki Homma

Wataru Odashima

Ichiro Yokokura

Kazumasa Mikami

Katsutoshi Miyaji

Toshiaki Ookubo

Masafumi Ohta

Toshiaki Ohkubo

Ichirou Yokokura

Ken Shiine

Shinji Sawane

Seiji Shigihara

Yasutomo Honma

An Add Drop Multiplexer (ADM) includes a separating unit that extracts, from an ODU4 storing therein a plurality of HO-ODUs each of which stores therein at least one LO-ODU, first MSI values which correspond to the HO-ODUs and each of which identifies a different one of the LO-ODUs for each LO-ODU. The ADM includes a converting unit that converts the first MSI values which correspond to the HO-ODUs and each of which identifies a different one of the LO-ODUs, into second MSI values which correspond to the ODU4 and each of which identifies a different one of the LO-ODUs. The ADM includes an ODU processing unit that extracts the LO-ODUs from the ODU4, on the basis of the second MSI values resulting from the conversion by the converting unit.

Transfer apparatus and transfer method

A transmission apparatus includes: a generator configured to generate position information indicating a position of header information of each of a plurality of first signals from a second signal nesting the plurality of first signals; a storage configured to store the position information generated by the generator and the plurality of first signals; a monitor configured to read the position information and the plurality of first signals stored in the storage, and to monitor the header information of each of the plurality of first signals based on the position information; and an output unit configured to output the plurality of first signals after monitoring the contents of the header information.

Transmission apparatus and transmission method

A transmission device to multiplex in a first signal a plurality of second signals each having a low rate as compared with the first signal, the transmission device includes: a plurality of memories to store the plurality of second signals; a selector to select one of the second signals read from the plurality of memories; and a controller to control read timing to read the plurality of second signals from the plurality of memories and signal selection timing to select the one of the second signals by the selector so as to execute rearrangement processing of the plurality of second signals read from the plurality of memories in accordance with cross-connect setting information for the plurality of second signals and shift processing of the plurality of second signals read from the plurality of memories in accordance with multiplexing positions of the plurality of second signals for the first signal.

Transmission device

A data reception device which receives data transmitted through a plurality of transmission lines. The data reception device includes a position detection unit which corrects a skew of data transmitted respectively through the plurality of transmission lines, and detects for each lane a position of a marker for identification of a lane which is assigned the data, and an information extraction unit which extracts identification information indicated by the marker for each lane using a result of the detection of the position of the marker by the position detection unit.

Data reception device, marker information extraction method, and marker position detection method

A signal distribution circuit includes: first to n-th input lines on which first to n-th signals are respectively input; first to (n&#x2212;1)th selectors each of which selects one of two inputs under the control of a select signal; and a first output line on which the first signal is output and second to n-th output lines on which output signals of the first to (n&#x2212;1)th selectors are respectively output, wherein: the first and second inputs of the first selector are supplied with the first signal and the second signal, respectively, the first and second inputs of the i-th selector (i is an integer between 2 and (n&#x2212;1)) are supplied with the output signal of the (i&#x2212;1)th selector and the (i+1)th signal, respectively, and any of the selectors, when selected by the select signal, selects the second input and, when not selected by the select signal, selects the first input.

Signal distribution circuit and stuffing control unit

An apparatus for mapping multiple lower-speed signal transmission frames to a higher-speed signal transmission frame. The apparatus includes buffers configured to buffer the lower-speed signal transmission frames, determination units configured to determine frequency justification information for the lower-speed signal transmission frames, a barrel shifter configured to receive signals output from the buffers, and a controller configured to control the barrel shifter to map the lower-speed signal transmission frames to the higher-speed signal transmission frame based on external settings for the respective lower-speed signal transmission frames and the frequency justification information determined by the determination units. When the minimum unit of the lower-speed signal transmission frames is a channel, the number of the buffers and the number of the determination units correspond to the maximum number of channels that can be multiplexed in the higher-speed signal transmission frame.

Frame mapping apparatus and frame mapping method

In a transmission apparatus, a comparison unit provides threshold values associated with an amount of data indicating a signal frequency, and compares an input parameter obtained by cumulatively adding a correction amount to the parameter with the threshold values. When the input parameter is within a range defined by the threshold values, a correction unit outputs a value of the input parameter. When the input parameter is out of the defined range, the correction unit outputs an associated one of the threshold values so as to eliminate an amount exceeding or falling short of the defined range, to thereby correct the input parameter. An addition unit detects the correction amount which is an amount of the immediately preceding value of the input parameter exceeding or falling short of the defined range, and cumulatively adds the correction amount to the input parameter used for the comparison of this time.

Transmission apparatus and frequency fluctuation compensation method

A transmitting apparatus includes a detecting unit that detects deviation and balance relative to a specified bit rate of a frame signal input at a constant bit rate; a dividing unit that reads at constant intervals from a buffer storing the frame signal and outputs a signal divided into a plurality of segments having a predetermined data length; and a correcting unit that, based on the deviation and balance detected by the detecting unit, corrects the data length for the division by the dividing unit.

Transmitting apparatus

A failure detection improvement apparatus that modifies a net list comprises; a net list input section to which the net list is input; a circuit modification section that adds an observation FF to an appropriate location on the net list; and a net list output section that outputs the net list that has been modified by the circuit modification section.

Failure detection improvement apparatus, failure detection improvement program, failure detection improvement method

An ATM cell bridge apparatus and a cell bridging method as well as an information transmission system having a cell bridge apparatus by which a cell can be outputted in accordance with a priority degree even during multicast processing. The ATM cell bridge apparatus includes a buffer unit for storing cell data of input cells, a buffer control unit for controlling writing and reading out of the cell data into and from the buffer unit, a cell production control unit for managing multicast information of the cell data read out from the buffer unit by the buffer control unit and producing a cell to be outputted from header information of the cell data, and a cell outputting unit for outputting the cell produced by the cell production control unit and issuing a cell data readout request to the buffer control unit.

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Oyama, Japan

Hiromichi Makishima