摘要:
An optical crossconnect apparatus which includes one terminal connected to a transmission path from one optical transmission terminal station and another terminal connected to a transmission path from another optical transmission terminal station, a first optical signal switch having “M1” ports and “N1” ports, through which the optical signal can pass, a second optical signal switch having “M2” ports and “N2” ports, through which the optical signal can pass, and “L” optical signal repeaters, one end connected to the “N1” ports of the first optical signal switch, and the other end connected to the “N2” ports of the second optical switch. The “N1” and the “N2” ports are equal to “L” optical signal repeaters. The “M1” ports of the first optical signal switch connected to the one terminal, and the “M2” ports of the second optical signal switch connected to the other terminal are larger than, or equal to 2.
摘要:
In a program data communication system, in response to a notification request command signal from a program data receiver apparatus for requesting a notification as to whether or not at least one designated program data among a plurality of pieces of program data can be descrambled, a program data transmitter apparatus transmits a notification command signal including information as to whether or not the designated program data can be descrambled by a descrambling section to the program data receiver apparatus. Next, the program data transmitter apparatus descrambles the designated program data in response to a transmission request command signal from the program data receiver apparatus for requesting that the designated program data be transmitted, and then transmits descrambled program data to the program data receiver apparatus.
摘要:
An information acquiring device and an information providing device used for a pull-type data distribution service is connected to an e-mail server and an information server on a network to receive an e-mail from the e-mail server through the network to acquire data, analyzes the data of the acquired received mail, acquires a definition file and contents in the information server to causes the contents to be displayed in a format defined by the definition file and, when it is recognized that the location information is present in the data of the received mail acquired through analysis, stores the recognized location information on the network for use in acquiring the definition file and the contents.
摘要:
A router apparatus 5 is provided with an ATM switch, an IP controller for performing routing control as a controller for layer 3, plural kinds of interfaces which are individually provided to plural transmission paths in which various communications are performed, and a cell multiplexing/demultiplexing unit, and manages the cell communications between respective parts on the basis of identification information. The input packet is subjected to IP processing in an interface to be converted to a cell in a common format, and the cell is serially multiplexed with a cell from another interface on a cell basis, and transmitted to the ATM switch at the cell multiplexing/demultiplexing unit. Each interface and each cell multiplexing/demultiplexing unit sets and switches the identification information for the header portion of the packet and the cell to be communicated by using a table in which the corresponding relationship of the identification information is registered.
摘要:
An optical transmission system accomplishes optical transmission to a long distance by combining a multiplexing line terminal with optical amplifiers, linear repeaters, and regenerators with optical amplifiers combined together. The system also accomplishes the optical transmission to a short distance by directly connecting the linear terminals therebetween, with an electric-to-optic converter replaced by an electric-to-optic converter having a semiconductor amplifier, with an optic-to-electric converter by an optic-to-electric converter having an avalanche photodiode as light receiver, an with no use of any optical booster amplifier and optical preamplifier in the multiplexing line terminal. With these, the optical transmission system can be easily constructed depending on the transmission distance required.
摘要:
In order that the various ring-switching modes of 2-Fiber BLSR, 4-Fiber BLSR and UPSR may be switched merely by changing a software, space division switches are disposed across an add drop switch, and one output drop switch and one output of the second space division switch are connected with the input stage of a selector which can be selected at the unit of a time slot. As a result, the various ring-switching modes can be switched merely by changing the software while suppressing the scale of the switch. Moreover, the change from the ring switch to the linear switch and vice versa can be effected.
摘要:
An amplifying circuit for dynamic focus of the invention applies, in a DC feedback loop of amplifying circuit for horizontal dynamic focus, a parabolic waveform signal for correction of vertical dynamic focus to a non-inverting input terminal or inverting input terminal of a detection amplifier for DC feedback, or to an input terminal of a DC control circuit, and superposes on a parabolic waveform signal for correction of horizontal dynamic focus in an amplifying circuit for horizontal dynamic focus through the DC control circuit, thereby stabilizing the DC action point in the amplifying circuit for horizontal dynamic focus, and also obtaining the parabolic waveform signal for correction of horizontal dynamic focus superposing the parabolic waveform signal for correction of vertical dynamic focus from the output terminal of the amplifying circuit for horizontal dynamic focus. Therefore, the amplifying circuit for vertical dynamic focus required in the prior art is not necessary, and hence the circuit may be simplified.Moreover, it is free from distortion of waveform, as experienced in the prior art, when adding after individually amplifying the parabolic waveform signal for correction of horizontal dynamic focus and parabolic waveform signal for correction of vertical dynamic focus, and therefore the distortion can be kept low as compared with the prior art.
摘要:
A communication network system includes a communication line, a plurality of communication stations each having a node coupled to the communication line and a network controller coupled to the stations for controlling routing for communication messages between nodes. In one embodiment, the messages are sent from plural terminals connected with each node along with communication performance prerequisites. The communication performance prerequisites for a communication message are discriminated in the node which receives the message. Traffic in various routes between the nodes is continually measured in the communication stations and the measuring results are stored in a database storage unit. Future traffic in the various routes is predicted on the basis of the information on the continually measured traffic by the use of a predetermined algorithm and stored in the storage unit for use in determination of routes for communication messages on the basis of the result of the communication performance prerequisites discrimination and predetermined criteria with respect to the updated information on the predicted traffic in the storage unit.
摘要:
A television broadcasting device 1 transmits a television signal onto which control data for controlling a browser function of a television receiver 2 has been multiplexed. A television screen generating section 20 generates a television screen based on the received television signal. A browser display instruction obtaining section 71, a URL obtaining section 72, and a display style information obtaining section 73 extract the control data multiplexed onto the television signal. When a browser display instruction 111 is received, a microcomputer 51 receives a content 102 corresponding to a URL 112 from a server 3, and generates a browser screen based thereon. A screen combining section 30 combines the browser screen with the television screen in accordance with display style information 113 received from the microcomputer 51. Thus, it is possible to display the browser screen in a combined form with the television screen in accordance with a display style designated by a broadcaster of the television signal.
摘要:
Disclosed is a mobile communication system preventing the transmission of acknowledgements at a burst leading to a decrease in throughput caused by detecting the retransmission and the congestion of packets at the protocol of a transport layer. In a mobile communication system including a mobile terminal and gateway equipment for relaying a packet between a communication partner and the mobile terminal, if the gateway equipment receives the acknowledgement from the mobile terminal, the gateway equipment waits the transmission of the received acknowledgement to the communication partner until the estimated transmission time passes from the time at which the gateway equipment receives the previous acknowledgement from the mobile terminal.