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1. 发明专利

JPH10294776A CIRCUIT-SWITCHING CONTROLLER 失效
公开(公告)号：JPH10294776A
公开(公告)日：1998-11-04
申请号：JP10133497
申请日：1997-04-18
申请人： HITACHI LTD
发明人： ARAKI YUKITO , HASHIMOTO TOYOKAZU
IPC分类号： H04L1/22 , H04L29/14 , H04M11/00
摘要： PROBLEM TO BE SOLVED: To prevent data from being lost and to prevent the transmission efficiency of data communication from being lowered by sending data which is stored in memory at the point of time, when data communication due to a line interchangeable ISDN line becomes available. SOLUTION: As soon as an abnormality is detected in a fast digital line and a fast digital line interface part, a receiving memory 9 stores data that is received from a data terminal. Next, a controlling part 7 sends an instruction that connects to an ISDN line to an ISDN line interfacing part 6, in order to perform data communication by using the ISDN line and the part 6 is connected to the ISDN line. After the connection is completed, a switch 8 switches a data transmission route from a fast digital line to the ISDN line, and data stored in the memory 9 is sent to the part 6, via the switch 8 and sent to the ISDN line. This enables prevention of data in the process of line-switching processing from the digital line to the ISDN line from being lost and to perform communication, without lowering the data communication efficiency.

2. 发明专利

JPH04316239A FRAME REPEATING SYSTEM BETWEEN LAN 失效
公开(公告)号：JPH04316239A
公开(公告)日：1992-11-06
申请号：JP10973691
申请日：1991-04-15
申请人： HITACHI LTD
发明人： YAMAMURA NOBUHIKO , WADA HIROYUKI , HASHIMOTO TOYOKAZU
IPC分类号： G06F13/14 , H04L12/28 , H04L12/40
摘要： PURPOSE:To reduce useless traffic and to limit a data frame repeating area by repeating/abandonning a received data frame by a repeating device corresponding to a group broadcasting address excepting for simultaneous broadcasting at a communication system composed of mutually connecting plural RAN by the repeating device. CONSTITUTION:Repeating devices 4 and 5 are equipped with filtering tables 100 and 200 previously registering group addresses corresponding to filtering (repetition block). When the frame is received from an area 1, for example, in the case of the simultaneous broadcasting address, the repeating device 4 repeats the received frame to the side of an area 2 without any condition. In the case of the group broadcasting address excepting for the simultaneous broadcasting address, when the correspondent destination address is registered on the table 100, the received frame is abandonned and when it is not registered, the received frame is repeated to the area 2 side.

3. 发明专利

JPH0424900B2 失效
公开(公告)号：JPH0424900B2
公开(公告)日：1992-04-28
申请号：JP12715188
申请日：1988-05-26
申请人： HITACHI LTD
发明人： KIDA MASAHIKO , HASHIMOTO TOYOKAZU , MATSUMURA HISASHI , WADA HIROYUKI

4. 发明专利

JPH0251306B2 失效
公开(公告)号：JPH0251306B2
公开(公告)日：1990-11-07
申请号：JP4232181
申请日：1981-03-25
申请人： HITACHI LTD
发明人： NAKAYASHIKI SUSUMU , KIDA MASAHIKO , HASHIMOTO TOYOKAZU
IPC分类号： H04L1/22 , H04L12/42

5. 发明专利

JPS58195341A Loop terminal equipment 失效
标题翻译：环形终端设备
公开(公告)号：JPS58195341A
公开(公告)日：1983-11-14
申请号：JP7672182
申请日：1982-05-10
申请人： Hitachi Ltd
发明人： WADA HIROYUKI , HASHIMOTO TOYOKAZU
IPC分类号： H04L1/22 , H04L12/437
CPC分类号： H04L12/437
摘要： PURPOSE:To improve reliability, by providing a shift register circuit to two pairs of transmission lines individually, erasing a GA code and decreasing the amount of hardware of a duplex loop transmission system. CONSTITUTION:Shift register circuits 5-1, 5-2 have bit length longer than that of the GA code given with the right of transmission, the GA code is received and the bit length of the GA code for erasing the GA code is required when the data to be transmitted from the calling station exists. A reception data is inputted to the shift registers 5-1, 5-2, a signal of an existing reception circuit 3-1 is inputted to a reception controlling circuit 6 with a selection circuit 4, and the data addressed to the calling station is transmitted to a common controlling section 10. The input data of the registers 5-1, 5-2 is outputted to transmission lines 1, 2 by transmission circuits 9-1, 9-2 via a switching circuit 8. The data of the register 5-1 is the GA code, and when a data transfer request signal is transmitted to a transmission controlling circuit 7 from the common controlling section 10, a transmission controlling circuit 7 transmits the signal.
摘要翻译：目的：为了提高可靠性，通过分别向两对传输线提供移位寄存器电路，擦除GA代码并减少双工回路传输系统的硬件数量。构成：移位寄存器电路5-1,5-2的位长度长于发送权赋予的GA代码的长度，接收到GA代码，并且需要用于擦除GA代码的GA代码的位长度，存在从主叫台发送的数据。接收数据被输入到移位寄存器5-1,5-2，现有接收电路3-1的信号通过选择电路4被输入到接收控制电路6，并且寻址到呼叫站的数据是发送到公共控制部分10.寄存器5-1,5-2的输入数据经由切换电路8由发送电路9-1,9-2输出到传输线路1,2。 5-1是GA代码，并且当数据传送请求信号从公共控制部分10发送到发送控制电路7时，发送控制电路7发送该信号。

6. 发明专利

JPS57101450A LOOP TRANSMISSION SYSTEM 失效
公开(公告)号：JPS57101450A
公开(公告)日：1982-06-24
申请号：JP17729180
申请日：1980-12-17
申请人： HITACHI LTD
发明人： KIDA MASAHIKO , HASHIMOTO TOYOKAZU , MATSUMURA HISASHI , WADA HIROYUKI
IPC分类号： H04L12/42
摘要： PURPOSE:To enable response confirmation of a transmission frame while the frame circulates a loop, by providing a loop answer field in the transmission frame of a loop transmission system. CONSTITUTION:In a station of a loop transmission system, a flag pattern is formed at a flag forming circuit 11 and a shifter 6 is transmitted with a station address from a transmission buffer 14 and other data. At the same time, an LA pattern is applied to a shifter 6 from a loop answer field (LA) forming circuit 12. The shifter 6 transmits the frames to a loop transmission line 1. The frames from the transmission line 1 are inputted to a reception shifter 5 and when the LA pattern is received, it is replaced with the output of an LA forming circuit 7 and checked at an error check circuit 17. Thus, the response confirmation of transmission frames can be made while the frame circulates the loop.

7. 发明专利

JPS5250603A CIRCUIT WATCH SYSTEM 失效
公开(公告)号：JPS5250603A
公开(公告)日：1977-04-22
申请号：JP12636675
申请日：1975-10-22
申请人： HITACHI LTD
发明人： FUKUDA KOUZOU , HASHIMOTO TOYOKAZU
IPC分类号： H04L25/02 , H04L1/20 , H04L29/14
摘要： PURPOSE:To utilize the single multi in order that the data transmission status can be watched with the nakes eye by means of the display apparatus even when the speed of data transmission is high.

8. 发明专利

JPH06338896A FAULT PROCESSING METHOD FOR LOOP TRANSMISSION SYSTEM 失效
公开(公告)号：JPH06338896A
公开(公告)日：1994-12-06
申请号：JP12574593
申请日：1993-05-27
申请人： HITACHI LTD , HITACHI JOHO NETWORK KK , HITACHI COMPUTER ENG
发明人： MIYAGAWA TORU , HASHIMOTO TOYOKAZU , MAEBA TAKAHIRO , INOUE MASAHIRO
IPC分类号： G06F13/00 , H04L12/42
摘要： PURPOSE:To attain a stuck fault operation from which a faulty node is excluded by temporarily separating a self node from a transmission line, allowing its own node to perform a self-diagnostic test when an abnormality is detected by a fault processing, resubscribing it to the transmission line when the result is normal, and separating it from the transmission line as it is when the result is abnormal. CONSTITUTION:A node control part 22 being the host processor of a control processor 17 is provided with the transmitting and receiving function of the data frame of its own node destination and a compare check state corresponding to it, so that a processing can be attained even when the fault of a loop transmission control part 10 occurs in addition to the conventional fault processing. The control part 22 transmits the data frame of its own node destination to the processor 17 at a prescribed interval, so that the reception monitor and compare check of the data frame circulating through a transmission line 1 can be performed and when the frame is not matched, the self- diagnostic test can be executed. Thus, it is possible to confirm not only the normality of the transmission line 1 but also the normality of the processor 17 and to facilitate a countermeasure at the time of the occurrence of the fault of the control part 10 and the processor 17.

9. 发明专利

JPH0360242A NETWORK SYSTEM 失效
公开(公告)号：JPH0360242A
公开(公告)日：1991-03-15
申请号：JP19410589
申请日：1989-07-28
申请人： HITACHI LTD
发明人： TAKAHASHI YASUHIRO , TSUKAGOSHI MASAHITO , TERADA MATSUAKI , HASHIMOTO TOYOKAZU , HIYAMA KUNIO
IPC分类号： H04L12/42
摘要： PURPOSE:To improve the data transfer capacity of a whole system by providing each node with a function to receive data from one highway in principle and transmit and receive the data to/from all the highways only in the case for a common data area. CONSTITUTION:A network system consists of a trunk line node 300, a trunk line LAN 301, a branch line LAN 303, and terminal equipment 304. Then, each node device 300 on a loop network executes reception processing operation for a communication frame inputted from one specified communication channel among plural communication channels (highway) multiplexed physically or logically, and executes transmission processing operation by using the communication frame flowing in the optional communication channel selected correspondingly to a destination node. Thus, the data transfer capacity of the whole system can be improved without accelerating information processing speed at each node device 300.

10. 发明专利

JPH0113665B2 失效
公开(公告)号：JPH0113665B2
公开(公告)日：1989-03-07
申请号：JP3533781
申请日：1981-03-13
申请人： HITACHI LTD
发明人： HASHIMOTO TOYOKAZU , KIDA MASAHIKO , MATSUMURA HISASHI , WADA HIROYUKI , NAKAYASHIKI SUSUMU
IPC分类号： H04L1/22 , H04L12/437

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