Mitsubishi Denki Kabushiki Kaisha

Kddi Corporation

Kddi Submarine Cable Systems Inc.

Other

Mitsubishi Denki K.k.

Masaru Kitusregawa

Yasunori Kasahara

Masatoshi Suzuki

Takashi Mizuochi

Hideki Goto

Yukio Horiuchi

Toshio Kawazawa

Kenkichi Shimomura

Daishi Ishii

Hiroshi Fukumoto

Kazuhiko Higashi

Naoya Tanaka

Masaru Kitsuregawa

Keisuke Oda

Kazuaki Arimoto

Terumi Kuwada

Takashi Yoshida

An optical repeating system includes an optical transmitter and a plurality of optical amplifying repeaters. The optical transmitter specifies a part or all of the optical amplifying repeaters, and transmits a supervisory command to the specified optical amplifying repeaters as a first sub-signal via an uplink or downlink optical transmission line. The supervisory command is a command to supervise internal circuits of the optical amplifying repeaters. Receiving the supervisory command addressed thereto via the uplink or downlink optical transmission line, the optical amplifying repeaters each transmit a supervisory signal indicating a supervisory result corresponding to the supervisory command to optical receivers via the uplink and downlink optical transmission lines as a second sub-signal. The optical system can reduce the time take to acquire the supervisory information about the plurality of the optical amplifying repeaters.

Optical repeating system and optical amplifying repeater control method

An optical repeating system includes an optical transmitter and an optical amplifying repeater. The optical transmitter transmits a supervisory command and a control command to the optical amplifying repeater as a first sub-signal. The supervisory command is a command to supervise internal circuits of the optical amplifying repeater, and the control command is a command to control the optical amplifying repeater. The optical amplifying repeater includes multiple sub-modules each for amplifying and repeating main signals on multiple sets of optical transmission lines. When receiving the supervisory command via the optical transmission line, each sub-module transmits a supervisory signal indicating the supervisory result associated with the supervisory command to an optical receiver as a second sub-signal. In addition, when receiving a predetermined control command via the optical transmission line, each sub-module initializes another sub-module of the multiple sub-modules in response to the predetermined control command. The optical amplifying repeater can restart its control program even when it has fallen into a state where it is difficult to continue to execute the normal operation in accordance with the control program because of some exception or the like.

In an optical repeating system including an optical transmitter and optical amplifying repeaters, the optical transmitter specifies one optical amplifying repeater, and transmits to the optical amplifying repeater a supervisory command to supervise internal circuits of the optical amplifying repeater and a control command to control amplification factors of optical amplifiers of the optical amplifying repeater as a first sub-signal. Receiving the supervisory command via an optical transmission line, the optical amplifying repeater transmits a supervisory signal indicating a supervisory result corresponding to the supervisory command to optical receivers via optical transmission lines as a second sub-signal. Receiving the control command via the optical transmission line, the optical amplifying repeater is controlled to change amplification factors of the optical amplifiers in response to the control command.

A supervisory system and supervisory method of an optical amplifier repeater are proposed that can implement operation supervision taking account of the characteristics of individual supervisory targets of the optical amplifier repeater, thereby achieving higher reliability. The supervisory system includes an optical transmitter for transmitting an optical signal including an operation command to notify of a state of a supervisory target; an optical amplifier repeater that transmits a response optical signal including a response code obtained by measuring the supervisory target in response to the operation command; an optical receiver for receiving the response optical signal via an optical fiber and an information processing unit for converting the response code into a numerical form by using a predetermined expression that links the response code with measured information obtained by measuring in advance the supervisory target with an external measuring device during operation of the optical amplifier repeater in response to the operation command.

Supervisory system of optical amplifier repeater system and supervisory method of optical amplifier repeater system

A sorting apparatus is composed of sort processors connected in a pipeline fashion. Each sort processor 106 merge sorts data from the preceding sort processor and then outputs the merge sort result to the succeeding sort processor. The sort processor includes sort core portions and a front end internal storage and a back end internal storage for the respective sort core portions. Outside the sort processors, there are added external memories for the respective sort core portions. The front and back end internal storages and the external memories constitute a local memory. The sort core portions use, when a faulty area is found in the local memory, part of the front end and back end internal storages as an alternative memory.

Sorting apparatus

A sheet feeding apparatus detects the position of a sheet (30) during feeding thereof and calculates a deviation of the detected sheet position relative to a reference position to thereby enable accurate color printing. A follower roller (41) for detecting a feeding amount of the sheet is in contact with the sheet which is fed by a sheet feeding roller 1, so that is rotated in accordance with the movement of the sheet. A sensor (43) generates an output signal each time the follower roller (41) rotates a predetermined angle of rotation. In one form of the invention, a timing deviation detector (51) is provided for detecting a deviation in the output timing of an output signal of the sensor relative to a reference value. In another form, a rotation angle deviation detector is provided for detecting a deviation in the rotation angle of the sheet feeding roller relative to a reference value each time the sensor generates an output signal. A feeding amount deviation calculator (52) periodically calculates a deviation in the amount of feeding of the sheet relative to a reference feeding amount based on the deviation in the output timing of the sensor output signal of based on the deviation in the rotation angle of the sheet feeding roller each time the follower roller rotates a predetermined rotation angle.

Sheet feeding apparatus

A method and apparatus for controlling a hardware merge sorter to sort N.gtoreq.2.sup.n number of records, the hardware merge sorter including a plurality of local processors that are cascaded in series, a plurality of local memories and a plurality of selectors. Each selector is coupled to and between one of the plurality of local memories and a respective local processor and couples the local memory to the respective processor during a first sorting step. In addition, the plurality of local memories are coupled to one local processor, of the plurality of local processors, during a second sorting step. With this arrangement, the hardware merge sorter can sort a plurality N.ltoreq.2.sup.n+1 number of records. In one particular embodiment of the present invention, a plurality of hardware merge sorter cells are cascaded in series. With this arrangement, the hardware merge sorter can sort a plurality N.ltoreq.2.sup.n+2 number of records.

Method and apparatus for controlling a hardware merge sorter to sort a

An error collection method for a sorter system having n pipelined sort elements Pi (i=1-n) of the same type and n local memories Mi (i=1-n) each connected to the corresponding sort element and having a memory capacity of at least 2.sup.i-1 record length, which includes the steps of sorting in said sort elements when one of the sort elements detects a fault; reporting contents of an error to the upper structure; analyzing the error; and restarting sorting.

Growing community of inventors

Tokyo, Japan

Yasunori Kasahara