Matsushita Electric Industrial Co., Ltd.

Furuno Electric Company Limited

Matsushita Electric Co., Ltd.

Matsushita Electric Ind., Ltd.

Tsutomu Tanaka

Yukiko Ito

Hiroshi Yokota

Shinzo Doi

Takeshi Kokado

Masaaki Tamai

Katsuji Hattori

Hiroyuki Serizawa

Yoshinobu Tsujimoto

Tomoyuki Karibe

Chishio Ueno

Masaru Fuse

Hiroki Murakami

Hideaki Yamashita

Atsuhiro Tsuji

Tatsuro Ikoma

Daijirou Hasegawa

There is provided a configuration in an access point managed by a management device for dealing with a situation in which management by the management device is no longer possible. An access pointincludes a controllerthat controls the operation of the access point, and a management status detectorthat detects the management status by a management device. The controllerchanges the operation of the access pointby validating or invalidating an SSID according to the detecting result of the management status.

Wireless access point device and wireless network system with the same

A system interrelating a program to be broadcast with a CM stored on a networkis implemented. The CMs (second contents) stored on the networkare each assigned a URL, while the program (first content) to be broadcast is embedded with tag information, which is used to specify the URL of the CM to be interrelated with the program for reproduction and output. Based on the tag information embedded in the received program, a TV commerce terminalspecifies any one URL and then fetches the CM having the URL assigned.

Content providing system and terminal used therein

When a get resource message arrives from an exterior, a resource allocation part reserves a resource. In case of data reading or data writing, a declared value management part checks parameters and a slot allocation part allocates the resource, thereby constructing an efficient file system guaranteeing delay quality in relation to data reading. As the result, it is possible to provide a file system providing pictures in a quick response time for requests from users and supporting users requiring various regeneration speeds.

File system for handling real-time and non-real-time data

Scheduling unit for scheduling service requests to cyclically provide services

A configuration managing part stores the number of storage devices and respective identifying information. An empty area managing part stores empty-block addresses for each storage device. A destination determining part recognizes the number of storage devices with the information stored by the configuration managing part, and fetches one or more empty-block addresses for specifying empty storage areas included in each storage device from the empty area managing part. The destination determining part then repeatedly rearranges the empty-block addresses at random to determine destination of data.

Storage device management system and method for distributively storing data in a plurality of storage devices

A file system capable of performing bandwidth setting is realized. Further, a bandwidth assuring function and a prefetching function are added thereto, and are organically coupled to a bandwidth setting function, thereby realizing a real-time remote file system. For these purposes, a bandwidth setting request issued by an application is fed to a bandwidth setting part through an extended API The bandwidth setting part sets bandwidths, respectively, for transmission bandwidth control parts and and a prefetching amount control part The transmission bandwidth control parts and and the prefetching amount control part respectively control a transmission bandwidth and control the amount of prefetching on the basis of the bandwidths respectively set.

File system

A disc control device for holding a plurality of read requests as a queue, arranging the read requests and a newly inputted read request, reading out the read requests from the queue in the arranged order, and controlling the output of the requested data from a disc, comprises a queue unit for temporarily holds the read requests as the queue in which the read requests can be arranged, the read requests requesting data readout from the disc; an allowable time hold unit holds allowable time, which shows how much more delay can be allowed in order to satisfy delay time until the end of the data output, of each read request in the queue, the delay time being decided based on the ranking in the read request in the queue; and an arrangement control unit arranges the read requests in the queue along with the newly inputted read request in the queue based on the allowable time of each read request in the queue, each time a new read request is inputted.

Disc control device having reduced seek time by scheduling disc read

A video server in which each media segment file sever (MSFS) stores media segment files (MSFs) forming video data, and sequence control brokers (SCBs) installed between the video server and subscribers terminals receive video requests from the subscriber terminals, and read out the requested MSFs from the MSFSs. The readout MSFs are exchanged by an ATM switch to be transmitted to the SCBs respectively, which outputs the MSFs at predetermined intervals to the request-sender subscriber terminals.

Video server

A flow control device constructed at a switch device for connecting a plurality of ring networks for exchanging data of a cell among the ring networks. A user device for transmitting a cell carrying data is connected to each ring network, and it can transmit cells within a window counter number. Such flow control device comprises a buffer monitoring unit for monitoring the number of data in an output buffer, a regulation judging unit for comparing the number of data in each buffer with a first threshold value representing state of the buffer which is in danger of overflow, with a second threshold value representing state of the buffer which is not in danger of overflow, and outputting a regulation notice when the data number is grater than the first threshold value while outputting a regulation notice when the data number is smaller than the second threshold value, and a plurality of traffic controlling units for transmitting to the respective ring network a reset cell at a first interval when no regulation notice is received or the release notice is received while transmitting a reset cell at a second interval which is longer than the first interval when the regulation notice is received.

Flow control method

Disclosed is a data transmission unit for use in a system wherein data to be transmitted is organized into packets which may be assigned one of four states: idle, occupied, released, or reset. Or these packets may be assigned one of three states: idle, occupied, or released, each state being able to include a reset bit. Each unit has terminals associated therewith and is assigned two windows on the number of packets it may transmit. One window is a parameter for transmitting data by using idle packets and the other is by using released packets. The unit responds to the state of a received packet, the state of the windows, and the presence or absence of transmit data to control whether the packet transmitted out of the unit is a packet from internal transforming buffers, a released packet from a released cell producing circuit, an occupied packet containing data from the unit's own terminals. A released packet contains the address of the unit which generated it and is generated when there is no data to be transmitted and an idle packet is received by the unit. Any unit can occupy a released packet with data from its terminal within the second window band, thereby increasing data throughput.

Data transmission system with packets having occupied, idle, released,

A packet communications network for transmitting data between nodes by the use of cell slots circulating the network includes a center node inserted in the ring network for sequentially generating, at a selected rate, first and second types of cell slots interleavingly for transmitting first and second types of data, respectively. Each cell slot has a type code for identifying either one of the first and second types, and a status code for identifying the different status of the cells. Each node detects whether the received cell is the first type or the second type. If the received cell is the first type, it is used for transmitting the connection-oriented data under MARS system. If the received cell is the second type, it is used for transmitting the connectionless data under ATMR system.

Packet communications network and communications method

A data transmission unit for use in a system wherein data to be transmitted is organized into packets which are assigned one of three states: idle, occupied, or released, and transmitted among interconnected units. Each unit is assigned a window limit on the number of packets it may transmit and has one or more terminals associated therewith, which may or may not have data to transmit. The unit responds to the state of a received packet, the state of the window limit, and the presence or absence of transmit data to control whether the packet transmitted out of the unit is a packet from an internal switching buffer, a released packet from a released cell producing circuit, an occupied packet containing data from the unit's own terminals, or a dummy cell. A released packet contains the address of the unit which generated it and is generated when there is no data to be transmitted and an idle cell is received by the unit. Any unit other than the generating unit can occupy a released packet with data from its terminal, even though its allocated window is exhausted, thereby increasing data throughput.

Packet data transmission unit having occupied, idle, and released states

A growable interconnect fabric cell switch module including a plurality of first cell switches for interconnecting cells; a plurality of second cell switches for interconnecting the cells outputted from the first cell switches; a plurality of third cell switches for interconnecting the cells outputted from the second cell switches; and a path arbitrating device for making a decision on cell transfer permission and on which second cell switch ought to be used in a cell transfer, based on a demanded cell number, which indicates a number of the cells which demand to be transferred from each first cell switch to each third cell switch.

Growable interconnect fabric cell switch module

A transmission system for packaging and transmission digital video data divides the data into a first group of components which would cause image quality to be drastically damaged if discarded, and a second group of components which would cause little damage if discarded. Data cells are composed for each group of components, and a priorty level is assigned giving a high priority to the first group of components and a low priority to the second group of components. The data is sent and received, and the received data is classified in accordance with the priority levels. If it is necessary to discard low priority components, a compensating device compensates for the discarded cells to ensure a constant image transmission across a congested channel.

Fast packet transmission system of video data

Respective end faces of two or more optical waveguides (23 to 29) are connected on one end face of a focussing rod lens (20) and a reflection means (21) having a reflection plane tilted with a specified angle (.alpha.) to the normal plane to the lens axis is disposed behind the other end face of the focussing rod lens (20) and angle of reflection plane of the reflection means (21) is varied by rotating the reflection means (21) around the lens axis (203) or by means of a piezo-electric driving device (30), thereby attaining selective switching of the waveguides (from 23 to selected one of 24 or 29) or varying the amount of rays to be transmitted through the waveguides (23 and 24 of FIG. 4), or thereby modulating the rays. By utilizing a semitransparent filter forming another tilted reflection plane, the amount of attenuation for different wavelength or connection of the waveguides are controlled separately.

Growing community of inventors

Nishinomiya, Japan

Tsutomu Tanaka