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41. 发明专利

JPH01177737A CONGESTION CONTROL SYSTEM 失效
公开(公告)号：JPH01177737A
公开(公告)日：1989-07-14
申请号：JP131288
申请日：1988-01-08
申请人： HITACHI LTD , HITACHI MICROCUMPUTER ENG
发明人： OKADA MASAYUKI , TAKADA OSAMU , TERADA MATSUAKI , HASHIMOTO TOYOKAZU
摘要： PURPOSE:To minimize increase in a transmission line load due to retransmission by allowing a transmission station to discriminate whether or not automatic retransmission is implemented in response to the state of a reception station. CONSTITUTION:A reception station sets a status to a status field of a packet 100 and sends it back depending on the status of (1) normal reception of packet 100, (2) no reception of packet 100 due to transient cause such as buffer busy and (c) no reception of packet 100 due to inhibited reception. The transmission station receives the status of the packet 100 and starts automatic retransmission by the automatic retransmission device when the status represents it that the packet is not received due to a transient cause such as buffer busy. Thus, the increase in the transmission line load due to retransmission is minimized.

42. 发明专利

JPS6477247A LOOP TRANSMISSION SYSTEM 失效
公开(公告)号：JPS6477247A
公开(公告)日：1989-03-23
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
摘要： PURPOSE:To confirm the response to a transmission frame within the time when the frame is once circulated in a loop, by providing the transmission frame with a loop answer field. CONSTITUTION:Stations(ST) are connected on a loop transmission line 1, and data transmitted from one ST passes the other STs in the direction of an arrow and is returned to the transmission source ST. In this constitution, the transmission frame shown in the figure is transmitted from the transmission ST and is received by the reception ST. When the frame is transmitted from the transmission ST, the LA (loop answer) field is set to pattern (12)16 of a term 1 in the figure. The reception ST rewrites contents of the LA field in accordance with individual phenomena by which it is judged that this frame reaches the reception ST.

43. 发明专利

JPS6412424B2 失效
公开(公告)号：JPS6412424B2
公开(公告)日：1989-02-28
申请号：JP1457181
申请日：1981-02-03
申请人： HITACHI LTD
发明人： MATSUMURA HISASHI , HASHIMOTO TOYOKAZU , KIDA MASAHIKO , WADA HIROYUKI
IPC分类号： H04L29/08 , H04L12/433

44. 发明专利

JPS62207043A REMOTE POWER SUPPLY CONTROL SYSTEM 失效
公开(公告)号：JPS62207043A
公开(公告)日：1987-09-11
申请号：JP4830486
申请日：1986-03-07
申请人： HITACHI LTD
发明人： HASHIMOTO TOYOKAZU , TOTSUGI YOSHINORI
摘要： PURPOSE:To attain the system suitable for a loop transmission system inexpensively with high reliability by using a separate signal to apply application and interruption command of a power supply and using a master device to confirm the application/interruption command. CONSTITUTION:When a slave device 2 receives a power application command code, a control circuit 17 detects the code via a reception circuit 7 and when the code is consecutive for a prescribed time, it is judged that the application command comes and the power supply application command is issued to a device 3 to be power-controlled via a control line 4. The control circuit 17 compares it with the state of a stat line 5, and when the power supply is applied, a power supply application confirming code is sent as it is, and when the power supply is disconnected is a bit serial data is sent to a transmission line 6 via a parallel/serial conversion circuit 21 to send the specific code of the slave device 3. The master device 1 identifies received information via the reception circuit 7 and displays the end of power application when the power supply application confirming code exists and displays the slave device specific code when the said code exists thereby representing the fault at the salve device, and the similar operation is applied even at the power interruption.

45. 发明专利

JPS6273834A MASTER STATION ALTERNATING SYSTEM IN DATA EXCHANGE NETWORK 失效
公开(公告)号：JPS6273834A
公开(公告)日：1987-04-04
申请号：JP21231585
申请日：1985-09-27
申请人： HITACHI LTD
发明人： ISHIKAWA KAZUFUMI , HARAKAWA TAKESHI , HASHIMOTO TOYOKAZU , NAKAYASHIKI SUSUMU
摘要： PURPOSE:To attain complete master station substitution by allowing automatically a standby master station to act for the master function even when the master station is faulty and noise on a loop transmission line is superimposed on a carrier during the master station change. CONSTITUTION:A carrier state supervisory device 15 of a standby master station 4 checks the presence of a carrier on a transmission line. A token transmission delay device 20 sends a token transmission instruction to a toke generator 21 after the elapse of a time when at least a carrier is subject to synchronization establishment in all the transmission line by the reception of the token transmission instruction. The toke generation device 21 sends a token to other transmission line by the reception of token transmission instruction. Thus, the standly master station 4 acts for the master function to restart the inter-network communication.

46. 发明专利

JPS60167542A DATA TRANSMISSION SYSTEM 失效
公开(公告)号：JPS60167542A
公开(公告)日：1985-08-30
申请号：JP199385
申请日：1985-01-11
申请人： HITACHI LTD
发明人： NAKAYASHIKI SUSUMU , YAGIYUU KAZUO , KASHIO JIROU , KIDA MASAHIKO , HASHIMOTO TOYOKAZU
IPC分类号： H04L12/08 , H04L12/18
摘要： PURPOSE:To attain a data transmission system which needs no initialization of series numbers at the transmission and reception sides in both a multiaddress communication start mode and an abnormality mode, by adding a forcible series number updata flag, for example, to the multiaddress information when the rationality of the multiaddress information is checked. CONSTITUTION:The multiaddress information contains a header part and a data part. The header part includes a target place 51 of the multiaddress information and uses a common address, for example, for delivery to plural target places. For a forcible series number update display 53, the series number is set forcibly equal to the transmission series number 52 of the multiaddress information which is received this time in an ON mode as a bit display. Then the corresponding update can be neglected in an OFF mode. For the multiaddress information communication execution result 54, the initial value D is set by a multiaddress information transmitter 30 and ''1'' is added every time a multiaddress information receiver 40 receives the multiaddress information. The transmitter 30 completes the multiaddress information normally in case the result 54 of the multiaddress information sent back after a round is equal to the number of the target places of multiaddress information. While the transmission is carried out again after an abnormality end is decided in case the result 54 is smaller than said target places.

47. 发明专利

JPS5933955A Loop transmitting system 失效
标题翻译：环路传输系统
公开(公告)号：JPS5933955A
公开(公告)日：1984-02-24
申请号：JP14404382
申请日：1982-08-20
申请人： Hitachi Ltd
发明人： MATSUI SUSUMU , YAGIYUU KAZUO , KIDA MASAHIKO , HASHIMOTO TOYOKAZU , MATSUMURA HISASHI
IPC分类号： H04L29/08 , H04L12/42
CPC分类号： H04L12/42
摘要： PURPOSE:To improve the using efficiency, by sending back a frame number sent from the transmitting side after adding it also to an answer frame at the receiving side and therefore sending the next frame without waiting particularly for an answer. CONSTITUTION:A repeater 1 functioning as plural optical modulation/demodulation circuits is connected to a loop transmission line 4 of a loop transmission system. A station ST comprises the repeater 1, a loop transmitting/receiving part 2 and a frame processing part 3. An auxiliary memory 5 is provided at the part 2, and a main memory 6 is set at the part 3. A received frame is written to the memory 5 and then processed at the part 3 on the basis of the intra-loop transmitting procedure. Then the receiving side sends back the frame number sent from the transmitting side after adding it also to an answer frame. Thus the next frame is transmitted without waiting particularly for an answer. Thus, the using efficiency of a loop is improved.
摘要翻译：目的：为了提高使用效率，通过在发送侧将其添加到接收侧的应答帧之后发送回发送帧，从而发送下一帧而不等待特定的答案。构成：用作多个光调制/解调电路的中继器1连接到环路传输系统的环路传输线路4。站ST包括中继器1，环路发送/接收部分2和帧处理部分3.辅助存储器5设置在部分2处，并且主存储器6被设置在部分3上。接收到的帧被写入到存储器5，然后在第3部分基于循环内发送程序进行处理。然后，接收方在将其添加到应答帧之后，发送从发送侧发送的帧号。因此，下一帧被传送而不等待特别是一个答案。因此，提高了环路的使用效率。

48. 发明专利

JPS58220535A Data transmitting system 失效
标题翻译：数据传输系统
公开(公告)号：JPS58220535A
公开(公告)日：1983-12-22
申请号：JP10206682
申请日：1982-06-16
申请人： Hitachi Ltd
发明人： NAKAYASHIKI SUSUMU , KIDA MASAHIKO , HASHIMOTO TOYOKAZU , WADA HIROYUKI
IPC分类号： H04L12/437
CPC分类号： H04L12/437
摘要： PURPOSE:To eliminate the influence exerted on the whole system by a fault of a transmitting mechanism of a station, by providing a timer for supervising a transmitting state of the own station, on each station. CONSTITUTION:When a transmission supervising timer 11 becomes time-out, it is regarded as generation of an abnormal state such as token (transmitting right) GA annihilation (or transmission is fixed) in the station concerned, and the station concerned is detached from a common transmission line 1. That is to say, it is instructed to a driving circuit 10 to detach the own station, connecting switches 12, 13 are switched as shown by a dotted line, and the own station is detached from the common transmission line 1. When sending out the token GA (when transmission of the station concerned ends), if the transmission supervising timer 11 is already in a stop state, it is regarded as generation of an abnormal state such as token GA overlapping (or unapproved transmission) in the station concerned, and the station concerned is detached from the common transmission line in the same way as mentioned above.
摘要翻译：目的：为了消除台站发射机制故障对整个系统的影响，通过提供监控本台发射状态的定时器，在每个台站上。构成：当发送监视定时器11变得超时时，被认为是在相关站内产生诸如令牌（发送权限）GA湮灭（或发送固定）的异常状态，并且所涉及的站从公共传输线1.也就是说，指示驱动电路10分离本台，连接开关12,13如虚线所示切换，本台从公共传输线1分离当发送令牌GA（当有关站的发送结束时），如果发送监督定时器11已经处于停止状态，则被认为是诸如令牌GA重叠（或未经批准的发送）之类的异常状态的生成所涉及的车站和所述车站以与上述相同的方式与公共传输线分离。

49. 发明专利

JPS58130646A LOOP TRANSMITTING SYSTEM 失效
公开(公告)号：JPS58130646A
公开(公告)日：1983-08-04
申请号：JP1164082
申请日：1982-01-29
申请人： HITACHI LTD
发明人： NAKAYASHIKI SUSUMU , KIDA MASAHIKO , HASHIMOTO TOYOKAZU , NAKADA ISAO , YAGIYUU KAZUO
IPC分类号： H04L12/42
摘要： PURPOSE:To eliminate a faulty frame such as a floating frame, etc. as well as the erasion residue of a frame, by transmitting consecutively a specific pattern which has no effect to the transmission of data until the 2nd specific pattern comes back to a specific station after having a round along a loop transmission line. CONSTITUTION:The diagram shows a master station which realizes a transmit- ting system. A G detector 23 detects a specific pattern S which comes back after having one round along a loop transmission line 1 and then erases a reception pattern S of a receiving shift register 25 through an erasing device 24. At the same time, the transmission of a time fill code E is discontinued by an E transmitter 22. The transmitter 22 transmits continuously the code E until the transmission of the code E discontinued. A G detector 26 detects a pattern G and then erases the received pattern G via the device 24 and the register 25 as well as transmits specific patterns S and G via an S/G transmitter 21. Then the code E is transmitted by the transmitter 22.

50. 发明专利

JPS5887943A LOOP TRANSMISSION CONTROLLING SYSTEM 失效
公开(公告)号：JPS5887943A
公开(公告)日：1983-05-25
申请号：JP18538481
申请日：1981-11-20
申请人： HITACHI LTD
发明人： MATSUMURA HISASHI , HASHIMOTO TOYOKAZU , KIDA MASAHIKO , WADA HIROYUKI , ISHIKAWA KAZUFUMI
IPC分类号： H04B10/27 , H04B10/00 , H04B10/275 , H04B10/29 , H04L12/42
摘要： PURPOSE:To quickly confirm response, by fetching data when the data is addressed to a device itself, at the same time writting a reception response pattern in a response set field, and fetching the response set field into a buffer when the data is transmitted from the device itself, in a loop transmission system. CONSTITUTION:Data transmitted from an optical fiber 2 is photoelectrically converted at a demodulation section 3 and given to a transmission/reception section 5. The reception section discriminates whether the data is transmitted to the device itself or from the device itself, and when the data is addressed to the device itself, the data are transferred to data reception buffers 6, 3, the reception confirming pattern is set to the response field and transmitted on a loop via a modulation section. When the data is transmitted from the device itself, an address section, control section, and response set field only of data are fetched into response buffers 6, 1, and the data are not transferred on the loop. Thus, the response confirming time can be decreased and the throughput can be improved.

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