Sanwa Kagaku Kenkyusho Co., Ltd.

Fujitsu Corporation

Kenji Miura

Masayasu Kurono

Kiichi Sawai

Yasuaki Kondo

Toshinao Usui

Ryoichi Unno

Tamotsu Matsuo

Takuji Yamaguchi

Yoshimi Toyoda

Kyoichi Asano

Takashi Monzawa

Noriaki Kato

Akira Matsubara

Kuniharu Mizuno

Jun Asato

Naofumi Terada

Masato Fukushima

Hiroshi Ozawa

Toshinori Koyanagi

Setsuo Abiru

Toshiyuki Sakai

Hideki Shiono

Kazuhiro Uchida

Mitsuharu Wakayoshi

Katsuhiko Hirashima

Tsunemasa Suzuki

Kazuya Ryu

Shinichi Fujiyoshi

Motohide Hayashi

Tateo Shimaru

Hajime Fujimura

Kunihiro Sumoto

Takuji Kakigami

Seiji Miyano

Yukiharu Matsumoto

Yutaka Baba

Hiromoto Kimura

Mikio Hori

Masayuki Ogawa

Noboru Tomiya

Hiroshi Urano

Noriyuki Iwata

Masatoshi Ban

Yukiya Tanaka

Shigeyoshi Nakamura

Shuhei Taniguchi

Akira Fukui

Eiichi Suenaga

Yoshihiro Kumagai

A multicast packet readout control method is disclosed. An input multicast packet is temporarily stored in a multicast queue of a packet buffer. The multicast packet is read from the multicast queue, and converted into a unicast packet addressed to each of the destinations of the multicast packet. The converted unicast packet is stored in a unicast queue of the packet buffer. The converted unicast packet is then read from the unicast queue and transmitted to the destination.

Method and apparatus for multicast packet readout control

An optical network unit and an optical line terminal which efficiently control the data receiving and dechurning processes in a passive optical network. In a churning parameter memory subsystem, a first memory bank stores churning parameters that are currently used, while a second memory bank stores updates made to the churning parameters. Under the control of the churning parameter memory subsystem, those first and second memory banks change their roles with each other at a churning key updating time point. A data dechurning unit receives a data stream consisting of a plurality of frames and dechurns the information contained in the data stream, according to the stored churning parameters. When an update is done to the parameters in a certain frame, the data dechurning unit makes the update effective at the next frame, thus starting data dechurning operations from the next frame.

Optical network unit and optical line terminal

In an ATM cell multiplexer which multiplexes ATM cells outputted from a plurality of cards, sequential cell arrival numbers common to the ATM cells outputted from a plurality of cards are added to each of the cells to be written in memories, and the read side checks a sequentiality of the cell arrival numbers whereby the ATM cells are read in the order of arrival and the cell arrival number at that time is used as the cell arrival number to be checked at the next read time. Also, when any of the cards is pulled out, a card not pulled out is operated normally and an address counter of only the pulled-out card is cleared. Even when non-sequentiality of the cell arrival numbers occurs due to the clearance of the address counter, the maximum cell arrival number is set to the value which enables the oldest cells to be read first. Furthermore, by the division of storing memories according to priority degrees, a read control identifying the ATM cells for a real time system as well as the ATM cells for a data system can be performed.

ATM cell multiplexer

An optical subscriber line terminal unit and a state transition control method are provided which are capable of stabilizing operation. State information storing means, which is a nonvolatile memory, stores state information about the unit. Startup preparatory state shifting means causes a shift to a startup preparatory state at startup. Flag setting means sets an emergency stop state flag during the period of the startup preparatory state if it is judged based on the state information that a state before the startup is an emergency stop state. State transition control means causes a shift from the startup preparatory state to the emergency stop state if the emergency stop state flag is set, and causes a shift from the startup preparatory state to an initial state if the emergency stop state flag is not set.

Optical subscriber line terminal unit and a state transition control method

A delay adjustment unit and optical network unit which efficiently adjust the delay time of upstream data to improve the quality of data transmission services. Upstream transmission data is segmented into small data blocks. A downstream receiver receives control information on which upstream data blocks are granted or not granted to the unit. It also received an equalization delay update request that commands the unit to update its current equalization delay parameter. When this equalization delay update request is received, a delay adjustment controller controls the delay of each data block, depending on whether the transmission of each subsequent data block is granted. An upstream transmitter then transmits the granted data blocks with the adjusted delay times.

Delay adjustment unit and method, optical network unit, and communication system

A fixed-length cell multiplexing/distributing processing is disclosed. The apparatus for this processing includes a plurality of fixed-length cell transmitting apparatuses, each of which sends a fixed-length cell, and a fixed-length cell multiplexing apparatus which multiplexes the fixed-length cells received from the fixed-length cell transmitting apparatuses and outputs the thus multiplexed cells. One of the plurality of fixed-length cell transmitting apparatuses is configured as a highest-priority fixed-length cell transmitting apparatus. Further, the highest-priority fixed-length cell transmitting apparatus comprises a fixed-length cell storage section and a fixed-length cell read control section. The fixed-length cell multiplexing apparatus comprises a plurality of FIFO storage sections, an FIFO control section, and a multiplexing section. With this structure, information to be notified is divided into fixed-length cells for transmission. The fixed-length cell from the highest-priority fixed-length cell transmitting apparatus is directly output without storing it, thereby accurately performing first-come, first-served processing for fixed-length cells.

Fixed-length cell multiplex transmission apparatus, fixed-length cell

A data communication method enables communications between terminals adapted to handle frame structure data having different formats. The terminals are connected via an asynchronous transfer mode (ATM) network in which frame structure data is transmitted in a form of an ATM cell. The terminals include at least a first terminal and a second terminal. The first terminal is adapted to handle data having a super frame (SF) format. The second terminal is adapted to handle data having an extended super frame (ESF) format. A type of frame format of frame structure data to be sent to one of the terminals is distinguished by detecting a synchronization pattern of the frame structure data. The frame structure data is converted when the frame structure data is sent to the one of the terminals so that the converted frame structure data has a type of frame format corresponding to the detected synchronization pattern.

Data communication method for communicating data having different frame

Hydantoin derivatives and salts thereof, intermediates therefor, process for the preparation thereof, and medicines containing the derivative, wherein said derivatives have the formula ##STR1## wherein one of V and W is hydrogen and the other is a halogenomethyl group, 1H-tetrazol-5-yl radical, --COOR group,

Hydantoin derivatives for treating complications of diabetes

A process for the preparation of optically active 4-oxo-1-benzopyran-2-carboxylic acid derivatives of the formula ##STR1## wherein X and Y are hydrogen atom, halogen atom or alkyl group, and R.sub.1 is hydrogen atom or alkyl group, intermediates thereof, as well as a process for the preparation of the intermediates.

Process for the preparation of optically active

The invention relates to a hydantoin derivative, salt thereof, process for the preparation thereof, and medicine containing the derivative. The derivative is represented by the formula ##STR1## wherein M is --CONH--NHR.sup.1 group, --CONH--OR.sup.2 group, ##STR2## in which R.sup.1 is hydrogen atom, an alkyl group, an alkenyl group, a phenyl radical, a substituted phenyl group, a naphthyl radical, a substituted naphthyl group, a pyridyl radical, a furyl radical or a thienyl radical, R.sup.2 is a hydrogen atom, an alkyl group, a phenyl radical or a substituted phenyl group, R.sup.3 and R.sup.4 are the same or different independently, each being a phenyl radical, or an aralkyl group, or R.sup.3 may form a substituted or non-substituted C.sub.5-6 saturated heterocyclic ring together with R.sup.4 and a possible nitrogen or oxygen atom, R.sup.5 forms a substituted or non-substituted saturated heterocyclic ring together with R.sup.6 and a possible nitrogen or oxygen atom, R.sup.7 is a nitroxy radical or a heteroaryl group, .sub.m and .sub.n are an integer of 2 to 5, Q is a hydrogen atom or ##STR3## in which R.sup.8 and R.sup.9 are the same or different independently, each being a substituted or non-substituted alkyl group, or R.sup.8 may form a substituted or non-substituted C.sub.5-6 saturated heterocyclic ring together with R.sup.9 and a possible nitrogen or oxygen atom, .sub.r is an integer of 2 to 5, T and X are the same or different independently, each being a hydrogen atom, a halogen atom, an alkyl group, an alkoxy group or an alkylmercapto group, and Z is an oxygen or sulfur atom. The derivatives and salts thereof are useful for the treatment of complications of diabetes and circulatory diseases.

Hydantoin derivatives for treating complications of diabetes and

Hydantoin derivatives of the formula ##STR1## wherein Ra and Rb are same or different, each being hydrogen atom, alkanoyl, substituted or none-substituted aroyl, heteroaroyl, alkoxycarbonyl, substituted or none-substituted aralkoxycarbonyl, aryloxycarbonyl, N-alkylcarbamoyl, N,N-dialkylcarbamoyl, substituted or none-substituted N-aralkylcarbamoyl, alkoxyalkyl, 1-(acyloxy)-alkyl, alkylmercapto, substituted or none-substituted arylmercapto, alkylsulfinyl, substituted or none-substituted arylsulfinyl, alkylsulfonyl or substituted or none-substituted arylsulfonyl, but both of Ra and Rb do not concurrently mean hydrogen atom, a process for the preparation of the derivatives, and use thereof as an agent for preventing and curing chronic complications due to diabetes.

(D)-6-fluoro-2,3-dihydro-2',5-dioxo-spiro[4H-1-benzo

Hydantoin derivatives and salts thereof, intermediates therefor, process for the preparation thereof, and medicines containing the derivatives, wherein said derivatives have the formula ##STR1## wherein one of V and W is hydrogen and the other is a halogenomethyl group, 1H-tetrazol-5-yl radical, --COOR group,

Process for preparing optically active hydantoins

Hydantoin derivatives and salts thereof, intermediates therefor, process for the preparation thereof, and medicines containing the derivative, wherein said derivatives have the formula ##STR1## wherein one of V and W is hydrogen and the other is a halogenomethyl group, 1H-tetrazol-5-yl radical, --COOR group, in which R is hydrogen atom, an alkyl group, --(CH.sub.2 CH.sub.2 O)nCH.sub.3 group (n is an integer of 1 to 113) or substituted phenyl, ##STR2## in which R.sub.1 and R.sub.2 are same or different independently, each is hydrogen atom, an alkyl group, substituted phenyl or --(CH.sub.2 CH.sub.2 O)nCH.sub.3 group (n has the meaning as referred to) or R.sub.1 may form a heterocyclic ring together with R.sub.2 and nitogen or oxygen atom, ##STR3## in which R.sub.3 and R.sub.4 are same or different independently and each is hydrogen atom or an alkyl group,

Hydantoin derivatives and salts thereof, intermediates therefor, process for the preparation thereof, and medicines containing the derivative, wherein said derivatives have the formula ##STR1## wherein one of V and W is hydrogen and the other is a halogenomethyl group, 1H-tetrazol-5-yl radical, --COOR group, in which R is hydrogen atom, an alkyl group, --(CH.sub.2 CH.sub.2 O)nCH.sub.3 group (n is an integer of 1 to 113) or substituted phenyl, ##STR2## in which R.sub.1 and R.sub.2 are same or different independently, each is hydrogen atom, an alkyl group, substituted phenyl or --(CH.sub.2 CH.sub.2 O)nCH.sub.3 group (n has the meaning as referred to) or R.sub.1 may form a heterocyclic ring together with R.sub.2 and nitrogen or oxygen atom, ##STR3## in which R.sub.3 and R.sub.4 are same or different independently and each is hydrogen atom or an alkyl group,

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Kasugai, Japan

Kenji Miura