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1. 发明专利

JPS60132442A SEARCHING SYSTEM FOR ABNORMAL POINT OF NETWORK 失效
公开(公告)号：JPS60132442A
公开(公告)日：1985-07-15
申请号：JP23974683
申请日：1983-12-21
申请人： HITACHI LTD
发明人： NAKAYASHIKI SUSUMU , KASHIO JIROU , YAGIYUU KAZUO , NAKASE HIROMU
IPC分类号： H04L12/437
摘要： PURPOSE:To improve the reliability of a ring-shaped network having a uniform and decentralized structure by making clear a constitution control station when the network has an abnormal. CONSTITUTION:In case an abnormal arrises at a general station ST1, for example and it is impossible for data to make a round along a ring, all general stations ST1 connected to the ring transmit ''Beacon II''. While a constitution control station ST202 transmits ''Beacon I '' and starts a timer for reception of ''Beacon''. When all ST transmit ''Beacon'', the stations ST excepting the downstream one next to the faulty station receive the ''Beacon'' transmitted from other ST at the upstream side. In case the own ST is not equal to the ST202, the received ''Beacon'' is sent to the downstream side. When the own ST is equal to the ST202, the transmission of the received ''Beacon I '' is stopped and the timer is stopped.

2. 发明专利

JPS58129840A SATELLITE COMMUNICATION SYSTEM 失效
公开(公告)号：JPS58129840A
公开(公告)日：1983-08-03
申请号：JP857583
申请日：1983-01-21
申请人： HITACHI LTD
发明人： YAGIYUU KAZUO , HIRAKO YOSHIO
IPC分类号： H04J3/00 , H04B7/15 , H04B7/212 , H04J3/17
摘要： PURPOSE:To reduce the number of time slots necessary for a reservation signal, by securing time slots for data transmission by the reservation signal and then transmitting a data signal by using the time slots. CONSTITUTION:All terminal stations are grouped in (m) groups in such >=2 ways that each terminal station belongs to one group and each group contains nearly the same number of terminal stations. One time slot for a reservation signal is assigned to each group and inquiry polling for inquiring of stations whether terminal there is data to be transmitted or not is carried out, group by group, e.g. 1, 2- groups at every time with regard to all groups of the kinds.

3. 发明专利

JPS6042960A LOOP TRANSMISSION SYSTEM 失效
公开(公告)号：JPS6042960A
公开(公告)日：1985-03-07
申请号：JP15014183
申请日：1983-08-19
申请人： HITACHI LTD
发明人： YAGIYUU KAZUO , MATSUI SUSUMU , NAKASE HIROMU , HARAKAWA TAKESHI
IPC分类号： H04L12/42
摘要： PURPOSE:To take a basic procedure terminal device which is different from each kind of terminal devices part in a network easily by allowing the network to relay all signals corresponded among terminals connected to this system in the unit of frames having a short fixed length when the terminals make communication mutually. CONSTITUTION:A frame processing section 3 sections all signals from a subscriber (SUB: terminal device or host computer concretely) into a fixed length, adds a header to each and trasmits each to an opposite station ST as a frame. Further, the header part is eliminated from the frame transmitted from the opposite station and outputs the result to the subscriber SUB without intermission. The frame processing section of each station, after the internal initialization is finished, starts a DMA for the frame reception from each subscriber and the loop. When the signal having a designated length is received, the DMA end interruption is generated. The nixt reception buffer address and data length are set in the program started by the DMA interruption and the DMA is restarted.

4. 发明专利

JPS52137201A LOOP COMMUNICATION SYSTEM BY WHICH RIGHT OF MAIN STATION CAN BE TRANSFERRED 失效
公开(公告)号：JPS52137201A
公开(公告)日：1977-11-16
申请号：JP5329676
申请日：1976-05-12
申请人： HITACHI LTD
发明人： OOTA MOTOSUKE , YAGIYUU KAZUO , HIRAKO SUEO
IPC分类号： G06F13/00 , H04L12/433
摘要： PURPOSE:To make it possible to make communication with flexibility, by making each station have the function by which it can be either main or sub-station.

5. 发明专利

JPS60162330A LOOP COMMUNICATION SYSTEM 失效
公开(公告)号：JPS60162330A
公开(公告)日：1985-08-24
申请号：JP1700484
申请日：1984-02-03
申请人： HITACHI LTD , HITACHI CABLE
发明人： MATSUI SUSUMU , AOKI TERUAKI , YAGIYUU KAZUO , HARAKAWA TAKESHI
IPC分类号： H04L12/423
摘要： PURPOSE:To perform instantaneously the transmission/reception processing of signals with no waiting mode by transmitting a control signal to a node connect to a terminal from a node connected to a host computer and controlling the timing between transmission and reception of a frame. CONSTITUTION:Data communication is carried out between a host computuer 1 and terminals A-C respectively via a node 3 at the host side, a loop transmission line 8 and nodes 5-1-5-3 at the terminal side. Processing 10 is carried out at an interval ti for times ts-1-ts-3 when the first fixed length of a frame is sent. The first frame is regarded as control signals CS-1-CS-3 sent from the computer 1 at nodes 5-1-5-3. Then the reception processing 11 is carried out. The storage of signals is started immediately after the end of the processing 11. The transmission processing 13 is carried out immediately when the time tp elapses since the processing 12 is through with nodes 5-1-5-3. Then the reception processing 14 is carried out immediately at the node 3. Then transmission processing 15 is carried out at this time point since a frame of a fixed length to be sent to the terminal is stored.

6. 发明专利

JPS6035855A MULTIPLE TRANSMISSION SYSTEM 失效
公开(公告)号：JPS6035855A
公开(公告)日：1985-02-23
申请号：JP14461983
申请日：1983-08-08
申请人： HITACHI LTD
发明人： MATSUI SUSUMU , KASHIO JIROU , YAGIYUU KAZUO
IPC分类号： H04L12/43
摘要： PURPOSE:To store a point-to-point terminal in a loop network by dividing a frame into a channel for a terminal and a point-to-point terminal and distributing the signal of each channel to each terminal. CONSTITUTION:A multiplexing device 2 and a frame synchronizing device 10 are connected to a main transmission line 1 with a loop shape and a terminal P5 having a loop control function and point-to-point P-P terminals T6 are connected to each device 2 respectively through a loop shaped subtransmission line 3 and a P-P terminal line 4 to constitute a loop net work. The device 10 transmits a frame constituted of a synchronizing pattern 7, a packet multiple channel 8 and a general terminal channel 9 and having fixed length with synchronization TF. Each device 2 distributes a signal from the channel 8 to the terminal P5 through the transmission line 3 and also distributes a signal from the channel to the terminal T6 through the line 4. The device 2 is also provided with a switch separating the transmission line 3 at the fault of the transmission line 3 and constituting a loop, so that the working rate of the system is improved.

7. 发明专利

JPS58147258A LOOP TRANSMISSION SYSTEM 失效
公开(公告)号：JPS58147258A
公开(公告)日：1983-09-02
申请号：JP2902982
申请日：1982-02-26
申请人： HITACHI LTD
发明人： YAGIYUU KAZUO , MATSUI SUSUMU , MATSUMURA HISASHI
IPC分类号： H04B10/27 , H04B10/275 , H04L12/42
摘要： PURPOSE:To reduce the loss rate of data in a loop network by detecting state dissidence between an answer arriving at a transmitting station coincide and the reception result of a receiving station. CONSTITUTION:A loop transmission and reception part 2 controls frame transmission and reception through a loop transmission line 4 to write received frames in an auxiliary memory 5, and its reception result is set after the received frame and returned to the transmitting station. When the states coincide with each other at a frame processing part 3, the transmission side performs control so that the remote station receives a frame with an order number which should not be transmitted and the reception side, on the other hand, such a frame is received to detect the occurrence of the state dissidence.

8. 发明专利

JPS5410601A REPRESENTATIVE ADDRESS CONTROL SYSTEM FOR LOOP COMMUNICATION SYSTEM 失效
公开(公告)号：JPS5410601A
公开(公告)日：1979-01-26
申请号：JP7559277
申请日：1977-06-27
申请人： HITACHI LTD
发明人： HIRAKO YOSHIO , YAGIYUU KAZUO
IPC分类号： G06F13/00 , H04L12/423
摘要： PURPOSE:To eanble the application of the key number system by carrying out transmission and reception through the block division of the data in case the privated high-speed circuit using the loop circuit is used incommon by a number of subscriber units.

9. 发明专利

JPS5312242A LOOP CIRCUIT POLLING CONTROL SYSTEM 失效
公开(公告)号：JPS5312242A
公开(公告)日：1978-02-03
申请号：JP8603376
申请日：1976-07-21
申请人： HITACHI LTD
发明人： HIRAKO SUEO , OOTA MOTOSUKE , YAGIYUU KAZUO , TANINAKA MASAO
IPC分类号： G06F13/00 , G06F3/00
摘要： PURPOSE:To secure a smooth common use of the channel through a variation/ control of the priority by classifying the data station into several groups through sending a specified code and not turing the proirity between the groups to the upper stream proirity.

10. 发明专利

JPS60252980A DUAL PORT MEMORY CONSTITUTING SYSTEM 失效
公开(公告)号：JPS60252980A
公开(公告)日：1985-12-13
申请号：JP10837084
申请日：1984-05-30
申请人： HITACHI LTD
发明人： SUZUKI MICHIO , NAKAYASHIKI SUSUMU , YAGIYUU KAZUO , KASHIO JIROU
IPC分类号： G06F15/167 , G06F12/00 , G06F12/06 , G06F13/18 , G06F15/16
摘要： PURPOSE:To reduce competition of memory access by providing two single port memories, a selector circuit that selects a address bus and data bus for each memory, and a write access competition avoidance controlling circuit. CONSTITUTION:When both memory accesses from a CPU1 and a CPU5 are read accesses, a bus 2 and a bus 6, a bus 4 and a bus 7 are connected to make simultaneous access possible. When accesses from the CPU1 and 5 are both write accesses, priority is given to earlier write access, and other access is prohibited. When writing, memory units 8 and 9 are written simultaneously by the CPU1 or 5. Thus, a dual port memory that enables simultaneous read access using existing IC memory can be constituted.

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