Abstract:
PURPOSE: To perform effectively and exactly synchronized continuous communication and to elastically meet burst communication by devising a reserve information part for each packet and giving the information as to the synchronized continuous communication to the reserve information part of the related packets in order to use them. CONSTITUTION: In the controlling part of the packet, a reserve-vacant bit is provided. If a request for communication is generated from a terminal equipment to a packet exchanging device (PX), a reserve-request signal is supplied to a mode changing part 22. If the reserve-OK signal is generated responding to the pulse from a synchronous counter 18 and to the pulse on a loop 17, a selecting signal to make the reserve-vacant bit of the packet that generated the OK signal, in '1', is generated by the changing part 22, and the part 22 inserts '1' in the controlling part. The process is repeated for the required number of packets in one frame. The number of the packets is counted by a reserve counter 23 each time when the reserve bit is inserted. Also, because of the control by a supervisory controlling system, no device PX is required to release the reserve even when the packet reserve is failed or when the communication is completed. COPYRIGHT: (C)1986,JPO&Japio
Abstract:
PURPOSE:To decrease number of nodes disabled for the operation at loop back operation by providing one or plural auxiliary supervisory nodes connected directly with a unified supervisory node via a duplicated direct transmission line comprising two transmission lines transmitting signals oppositely to each other onto the transmission line. CONSTITUTION:The auxiliary supervisory nodes SSV1, 2, 3 connected directly with the unified supervisory node MSV5 via a duplicated hot line comprising the two transmission lines 4a, 4b transmitting signals oppositely to each other are provided on the loop transmission line in a loop transmission system. Suppose that a fault takes place at a point A while the system 0 is in use, slave nodes MX10, MX11 detect a fault in the extracting state of a clock/synchronizing signal from a reception signal of the system 0, the MX10, MX11 are switched to the system 1 and awaits a command of the MSV or SSV. A fault of the system 0 is detected at the MSV, and the MSV gives a command to switch all nodes to the system 1 and each node is controlled afterward by the system 1.
Abstract:
PURPOSE:To make it possible that a master station recognizes the connection order of slave stations only with fundamental transmission and reception functions, by receiving all frames, which pass each slave station, in the slave station and reporting stored addresses from the slave station to the master station and counting and comparing addresses from individual slave stations in the master station. CONSTITUTION:The master station transmits a polling signal directed to all slave stations from a transmitting part 12. Each slave station receives this signal by a receiving part 15 and switches a switch circuit 19, which transmits normally received signals to a transmitting part 16, to transmit a response signal. This response signal passes only slave stations in the downstream of this slave station. Each slave station stores addresses of frames of passing response signals in a storage part 18. These stored addresses indicate addresses of slave stations in the upstream of this slave station. After a fixed time elasped, the master station transmits a signal, which instructs slave stations to report lists of stored addresses to the master station, to all slave stations. When receiving this signal, each slave station transmits the stored address list as data. The master station receives address lists from individual slave stations and counts and compares them to recognize the connection order of slave stations.
Abstract:
PURPOSE:To prevent discontinuation occurring to frames at the switching of transmission lines and to suppress data errors by providing a data invalidation period in a frame consisting of plural bits, and detecting this invalidation period by a data invalidation period detecting means provided in a communication device. CONSTITUTION:A communication system consists of transmission lines 3 and 4 which are used by switching an in-use and a stand-by system and plural nodes 20 which switch the transmission lines 3 and 4 by a transmission line switch 70 through repeaters 50 and 60. The frame unit of data transmitted between nodes 20 of this communication system consists of a flag F, control part C, data D, detection parts FCS, and data invalidation period B. Invalidation period detecting means 51 and 61 which detect this invalidation period B are provided to the repeaters 50 and 60 respectively. Then, switch parts 76 and 77 are controlled by a common control part 80 in the invalidation period to prevent discontinuation which occurs to frames during the switching of the transmission lines 3 and 4, suppressing errors of data.
Abstract:
PROBLEM TO BE SOLVED: To prevent responses from being retransmitted from the same RFID tag in transmitting a search command from a reader/writer and confirming RFID tags existing in a coverage area. SOLUTION: An RFID tag reading control apparatus comprises a generation means for generating first response control information for determining whether an RFID tag has already transmitted a response or not and a transmission means for transmitting a search command for searching an RFID tag existing in a coverage area together with the generated first response control information in transmitting the search command to the RFID tag. COPYRIGHT: (C)2008,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a communication method, a communication system, an access control apparatus, and a computer program, wherein when an IC tag is accessed by a plurality of antennas arranged along a moving route of the IC tag, a failure in an access is prevented and the whole efficiency is improved. SOLUTION: Identification information for identifying IC tags 1, 1, ... is recorded correspondingly to time when an access using a first antenna 3 succeeds, time information concerned with time from the switching of the antenna 3 e.g. up to the success of the access and positional information indicating the position of the antenna 3 in the moving direction of the IC tags 1, 1, ..., the identification information is selected on the basis of time from the switching of the first antenna 3 to a second antenna 3 e.g. arranged on the downstream side of the first antenna 3, the recorded time information, the position of the second antenna 3, and the recorded position information, and then the IC tags 1, 1, ... are accessed by using the second antenna 3 on the basis of the selected identification information. COPYRIGHT: (C)2008,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a communication method, communication system, repeating device and communication apparatus for realizing transmission of data and operation related to a transmitter that can not be operated directly, in a system which uses a plurality of communication apparatuses, a repeating device and a transmitter for transmitting data, and in which the repeating device broadcasts and transmits data received from one communication apparatus to which a transmission right is imparted, to another communication apparatus. SOLUTION: A communication apparatus 1 transmits a transmission right imparting request requesting imparting of a transmission right to a transmitter 3 to a repeating device 2 and the repeating device 2 discriminates whether the received transmission right imparting request is an instruction related to a transmission right of the communication apparatus 1 or an instruction related to the transmitter 3. When the request is discriminated as an instruction related to the transmitter 3, the transmission right is imparted to the transmitter 3, and broadcasting transmission of data transmitted from the transmitter 3 is started. Furthermore, when an operating instruction for operating the transmitter 3 is received from the communication apparatus 1, the repeating device 2 discriminates a kind of the instruction and transmits it to the transmitter 3. COPYRIGHT: (C)2007,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To realize the quantity used-base charging of software. SOLUTION: This system is constituted of a use permitting device for permitting the use of a software storage medium in which an enciphered program or data (software) are registered and a control center communicatively connected to the use permitting device for performing the setting of an available quantity and the totaling and charging of the quantity used. The use permitting device is provided with a clock for acquiring data information, a use permission processing part having a date information storing means for storing the acquired date information until acquiring the next date information, and a quantity used managing part for counting the use quantity used of the software of an end user, and the quantity used of the software is managed by the number of dates by the use permission processing part.
Abstract:
PROBLEM TO BE SOLVED: To facilitate a call operation on a packet exchange network by a client from a public switched telephone network PSTN. SOLUTION: The gateway device 3 connects a PSTN1 to a packet exchange network 2 to which pluralities of information terminals are connected. The gateway device 3 is provided with a recognition means, an incoming call notice means and a connection means. The recognition means recognizes information terminals on the packet exchange network 2. The incoming call notice means that receives an incoming call from the PSTN1 informs all the recognized information terminals of the incoming call. The connection means connects the PSTN1 to the information terminal first replying the incoming notice. Also the gateway 3 can use a broadcast address or a multicast address in order to inform all or pluralities of information terminals on the packet exchange network 2 about the arrival of incoming call in terms of polling. Besides, the gateway 3 can assign caller identification information and an incoming telephone number on the PSTN in advance to information terminals in order to select incoming call notice destinations. Otherwise it is preferred to use an automatic answering telephone terminal that can always accept an incoming call.
Abstract:
PROBLEM TO BE SOLVED: To facilitate the calling requests to plural terminals and also to secure connection to a specific voice communication terminal equipment by performing the broadcasting to plural voice communication equipments and selecting ones to establish the calls among those communication equipments that sent the answers. SOLUTION: The host names #11 to #15 which specify each terminal and the IP addresses #11 to #15 are assigned to the voice communication terminals #11 to #15 which are connected to a packet switching network #0. These terminals, host names and addresses are corresponding in 1:1 to each other. Each of addresses #11 to #15 consists of 32 bits and can designate a specific voice communication terminal as well as a specific host name by designating the specific value. Then every IP address is divided into 16 bits, and the first and second halves of the address are defined as a network address part and a host address part respectively. When all bits of the host address part are set at '1', for example, the network address part communicates with all terminals having the common IP addresses, that is, can perform a broadcasting operation.