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1. 发明专利

JPH03114331A CIRCULAR COMMUNICATION METHOD 失效
公开(公告)号：JPH03114331A
公开(公告)日：1991-05-15
申请号：JP25053489
申请日：1989-09-28
申请人： HITACHI LTD , HITACHI CABLE
发明人： SUGIMOTO NORIHIKO , YONEDA KATSUHIKO , OKADA MASAKAZU , TOMIZAWA HIROSHI , FUJIEDA SHUICHI
IPC分类号： H04L12/42
摘要： PURPOSE:To execute various communication formats between terminal equipments connected to an arbitrary station by enabling transmission/reception even when plural terminal equipments of 1:n multi-drop connection are connected to one and the same station. CONSTITUTION:Stations S1-S6 are connected in the order shown in figure to a circular transmission line 1 and terminal equipments are connected to respective stations and 2 terminal equipments T1, T2 are connected to the station S1. There is not limit in the connection number of terminal equipments and the stations S1-S6 are constituted similarly. In the case of plural slave terminal equipments in 1:n multi-drop connection to one and the same station, the reception of a same data to plural terminal equipments and the transmission to one terminal equipment among the plural terminal equipments are enabled. Thus, the circular communication method in which various communication formats are realized between terminal equipments connected to an arbitrary station is realized.

2. 发明专利

JPS6419851A MULTI-SLOT ACCESS SYSTEM 失效
公开(公告)号：JPS6419851A
公开(公告)日：1989-01-23
申请号：JP17467287
申请日：1987-07-15
申请人： HITACHI LTD
发明人： HAMADA TAKUSHI , TAKAHASHI MASAHIRO , YONEDA KATSUHIKO , OKADA MASAKAZU
IPC分类号： H04L12/43
摘要： PURPOSE:To eliminate the need for adding of talken information into a slot and to simply obtain common logic of control by suggestively realizing a talken pass function only with the display of 'idle' or 'occupied' of respective slots necessary for the case of arbitray occupation when a time slot is continuously occupied and transmitted. CONSTITUTION:In the transmitting system of a ring-shaped local area network, plural transmitting devices 11-16 are annularly and serially combined and a ring-shaped transmitting path is constituted. A transmitting frame, in which one transmitting device, at least, is constituted of plural time slots 8 for the unite of transmission, is repeated and traveled on the transmitting path and an area is provided in the respective time slots to show the slot is 'idle' or 'occupied' and the transmitting device to receive a transmitting request detects one time slot in the specified part of the transmitting frame is idle. When the device detets the 'idle' slot just after the 'occupied' slot, transmitting allowance is obtained, until the transmission is completed, the usable slot after this slot is successively made 'occupied' and information are inserted.

3. 发明专利

JPS63206045A METHOD FOR DETECTING FAULTY LOCATION IN RING NETWORK 失效
公开(公告)号：JPS63206045A
公开(公告)日：1988-08-25
申请号：JP3795287
申请日：1987-02-23
申请人： HITACHI LTD , HITACHI PROCESS COMPUTER ENG
发明人： HAMADA TAKUSHI , TAKAHASHI MASAHIRO , YONEDA KATSUHIKO , ONUKI TAKESHI , UCHIYAMA TOSHIHIKO
IPC分类号： H04L12/437
摘要： PURPOSE:To surely eliminate an illegal bypassed location in a network by calculating number of relay stages up to the currently adjacent transmission station and comparing it with an allowable bypass stage number stored in advance so as to allow a transmission station to apply the discrimination whether or not loopback is to be executed. CONSTITUTION:A transmitter N consists of a bypass means 10, a path switching means 20, an information transmission means 30, a constitution control means 40 and an access control means 50. The constitution control means 40 seeks an address of an adjacent transmitter, obtains bypass stage number up to an adjacent transmitter through the coincidence collation between the obtained address and address information arranged in the order of connection of the transmitter in a predetermined ring network so as to compare the relation of correspondence with the maximum allowable bypass stage number up to the predetermined adjacent transmitter thereby detecting the faulty location in a ring network.

4. 发明专利

JPH0567100B2 失效
公开(公告)号：JPH0567100B2
公开(公告)日：1993-09-24
申请号：JP20790186
申请日：1986-09-05
申请人： HITACHI LTD
发明人： HAMADA TAKUSHI , TAKAHASHI MASAHIRO , YONEDA KATSUHIKO , YASUMOTO SEIICHI , OKADA MASAKAZU , MATSUZAKI TOSHUKI
IPC分类号： H04L12/42

5. 发明专利

JPH05175970A PRIORITY CONTROL SYSTEM 失效
公开(公告)号：JPH05175970A
公开(公告)日：1993-07-13
申请号：JP34319491
申请日：1991-12-25
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： INADA SHUNJI , SUGIMOTO NORIHIKO , YONEDA KATSUHIKO , OGAWA HISAO , INADA KAZUHISA
IPC分类号： H04L29/06 , H04L12/40
摘要： PURPOSE:To flexibly revise the priority and to attain entire priority control with respect to data transfer by executing the processing according to a priority table stored in each station when plural data from each station are processed. CONSTITUTION:When a station 11 receives data from a communication line 10, an access control section 5 checks a destination station address and a sender station address in the data and an MPU 2 transfers the received data into a RAM 3 when the destination is coincident with its own address. Simultaneously the access control section 5 gives the sender address to a priority retrieval circuit 6 in parallel with the check of the destination and the sender to retrieve the priority of the reception data corresponding to the sender address and to revise the reception data processing waiting queue management table in the RAM 3. Thus, the priority of the reception data retrieved by the circuit 6 and the priority of reception data in the standby state having already been transferred in the RAM 3 are compared by the MPU 2 to revise the content of the table in (order of arrival.

6. 发明专利

JPH01209837A TRANSMISSION SYSTEM IN DECENTRALIZED MULTIPLEX EXCHANGE SYSTEM 失效
公开(公告)号：JPH01209837A
公开(公告)日：1989-08-23
申请号：JP3408888
申请日：1988-02-18
申请人： HITACHI LTD
发明人： HAMADA TAKUSHI , YONEDA KATSUHIKO , YASUMOTO SEIICHI , TOMIZAWA HIROSHI
IPC分类号： H04Q11/04 , H04L11/00
摘要： PURPOSE:To prevent the reduction in transmission efficiency by using a time slot being one multiplex unit in a loop transmission line in common for the connection of plural stations accommodated in the loop transmission line. CONSTITUTION:Effective channels in local multiplex information in plural stations ST connected to a network comprising loop transmission lines are linked. Thus, the time slot on the loop transmission line used to send the information between a center side station CST 205 and plural local stations DST 204 is limited to one and the information transmission efficiency on the loop transmission line is improved more than the case with the assignment of one time slot on the loop transmission line onto multiplex information of each local side station DST.

7. 发明专利

JPS63316541A DETECTION OF TROUBLED PLACE AT RING NETWORK 失效
公开(公告)号：JPS63316541A
公开(公告)日：1988-12-23
申请号：JP15122587
申请日：1987-06-19
申请人： HITACHI LTD , HITACHI PROCESS COMPUTER ENG
发明人： YONEDA KATSUHIKO , HAMADA TAKUSHI , TAKAHASHI MASAHIRO , ONUKI TAKESHI , UCHIYAMA TOSHIHIKO
IPC分类号： H04L12/42
摘要： PURPOSE:To compare a supervising signal with the number of the steps of the allowable by-pass stored beforehand, to once recognize the address of plural stations and to execute the high speed of a trouble detecting place at a double ring network by sending the simultaneous instruction of a trouble searching to respective transfer stations with a master station and outputting a supervising signal including a self- address with respective transfer stations. CONSTITUTION:Plural transmitting devices 1-N and terminal equipment 1a-Nc connected to the devices 1-N are connected to ring transmission lines Oa and Ob, a double ring transmission line is formed, connected through the devices 1-N to respective arbitrary equipment 1a-Nc, connected mutually and a ring network is constituted. By a by-pass means 10 of the transmitting device N, the transmission lines Oa and Ob are by-passed from the devices 1-N and the relation of the devices 1-N and the double transmission line is switched by a channel switching means 20. By a constitution control means 40, the detection of the trouble position is executed, the means 20 is controlled and the information transmission of the means 40 between the devices 1-N is executed by an information transmitting means 30. When a master station detects the trouble, the means 40 of respective devices 1-N instructs the sending of a supervising signal.

8. 发明专利

JPH03114330A LOOP TRANSMISSION SYSTEM 失效
公开(公告)号：JPH03114330A
公开(公告)日：1991-05-15
申请号：JP25053389
申请日：1989-09-28
申请人： HITACHI LTD , HITACHI CABLE
发明人： SUGIMOTO NORIHIKO , YONEDA KATSUHIKO , OKADA MASAKAZU , TOMIZAWA HIROSHI , OGAWA HISAO , MURAMOTO TORU , YASUMOTO SEIICHI , KOYAMA YUKIO
IPC分类号： H04L12/42
摘要： PURPOSE:To inhibit the reception of a cyclic data due to transmission abnormality by providing a channel header to revise decision. CONSTITUTION:Each of channels C1-Cl constituting a frame transmitted on a transmission line is constituted of a channel header CH and an information part I, and the channel header CH includes a parity bit P, a station identification code D, a monitoring bit M and an information valid bit V. Then a reception station decides normality of the information part from the content of the channel header CH set by a transmission station and the information valid bit V is revised into a reset state in case of the abnormal data. Thus, the circulation data due to transmission abnormality is not received.

9. 发明专利

JPS63285045A DETECTION FOR FAULT RECOVERY 失效
公开(公告)号：JPS63285045A
公开(公告)日：1988-11-22
申请号：JP11906087
申请日：1987-05-18
申请人： HITACHI LTD , HITACHI PROCESS COMPUTER ENG
发明人： UCHIYAMA TOSHIHIKO , ONUKI TAKESHI , OKADA MASAKAZU , YASUMOTO SEIICHI , HAMADA TAKUSHI , YONEDA KATSUHIKO
IPC分类号： H04B10/27 , H04B10/035 , H04B10/038 , H04B10/077 , H04B10/079 , H04B10/275 , H04L12/42 , H04L12/437
摘要： PURPOSE:To prevent an uncertain part of an transmission line from being fetched into the network by providing a function adding its own station address and sending to both direction of the pre-stage and the next-stage when a transmitter disconnected from the network receives a fault recovery supervising signal, to each transmission station. CONSTITUTION:A terminal station in the turn back state calculates number of bypassed stages between its own inter-network terminal stations, and stations at the outside of the network (relay stations) or other inter-network terminal station from an address in a fault recovery supervising signal received from the outside of the network and a transmission station connection order table stored in advance and when above mentioned number exceeds the maximum allowable bypass stage number stored in advance, since it is possible to cause instability in the transmission line, it is regarded as the fault recovery and the ring network is not constituted again. Thus, unstable network constitution is surely prevented.

10. 发明专利

JPS6364435A MULTI-SLOT ACCESS ANNULAR TRANSMITTER 失效
公开(公告)号：JPS6364435A
公开(公告)日：1988-03-22
申请号：JP20790186
申请日：1986-09-05
申请人： HITACHI LTD
发明人： HAMADA TAKUSHI , TAKAHASHI MASAHIRO , YONEDA KATSUHIKO , YASUMOTO SEIICHI , OKADA MASAKAZU , MATSUZAKI TOSHIYUKI
IPC分类号： H04L12/42
摘要： PURPOSE:To attain the efficient transmission by displaying a slot number used at the head to a slot other than the head so as to reduce slot header information. CONSTITUTION:A transmission packet from information processing units 21, 32 is stored in a transmission data buffer section 113 via a device adaptor 115 under the control of a transmission controller 114, The buffer section 113 sends a transmission start SREQ to a transmission access control section 4. The control section 4 receiving it detects a transmission enable slit and sends the packet by using it. Moreover, a reception access control section 6 detecting the slot addressed thereto from a received data RD informs the start of data reception by using the reception start RREQ to a reception data buffer section 112. A reception timing RTIM and a final command RLST are fed to the buffer section 112. The received packet in the buffer section 112 is transferred to the corresponding connection device via the adaptor 115 under the control of the control section 114.

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