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71. 发明专利

JPH07135511A PACKET COMPOSING METHOD 失效
公开(公告)号：JPH07135511A
公开(公告)日：1995-05-23
申请号：JP28227393
申请日：1993-11-11
申请人： HITACHI LTD
发明人： KAWABATA KO , TAKASE MASAHIKO , YANAGI JUNICHIRO
IPC分类号： H04Q3/00 , H04L12/28 , H04L12/951 , H04L12/56
摘要： PURPOSE:To obtain a packet composing method in which a concerned frame structure is discriminated from each connection and user data are composed based upon it by identifying plural kinds of frame structures and composing a packet according to a concerned packet composing means. CONSTITUTION:The method is applied to a cell reception part of an ATM adaptation processing section. The adaptation processing section has the function of giving user data recovered by from an ATM cell received from an ATM layer through adaptation processing to a host layer. The adaptation processing section is made up of a frame structure identification means 3 identifying a concerned frame structure for each connection and a combination circuit 4 combining a packet from a received cell based on one or plural frame structures. Then plural packet composing methods are supported by selecting a concerned composition means for each connection. Furthermore, the composing means is discriminated based on the structure of the received cell, then the composing method is discriminated by the hardware.

72. 发明专利

JPH0795243A CONNECTING DEVICE FOR LAN AND LARGE AREA NETWORK 失效
公开(公告)号：JPH0795243A
公开(公告)日：1995-04-07
申请号：JP23282093
申请日：1993-09-20
申请人： HITACHI LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： KAWAKITA KENJI , SASAKI TOSHIMITSU , DEWA HIROSHI , TAKASE MASAHIKO , WADA HIROYUKI , MIZUNO TOSHIRO , NISASE TAKEYOSHI , FUJITANI HIROSHI , OKUYA TAKENORI
IPC分类号： H04L12/46 , H04L12/28 , H04L12/66
摘要： PURPOSE:To provide an LAN-large area network connecting device suitable to adaptor redundancy for improving the reliability of the network. CONSTITUTION:An LAN-large area network connecting device 100 consists of an LAN adaptor 110 and a large area network adaptor 120, and those adaptors are connected through an LAN 1110-i or a line interface 1210. Therefore, the necessary number of adaptors of only a side desired to be made redundant can be set, so that the cost of the connecting device can be made inexpensive. Also, a distance between the LAN adaptor and the large area network adaptor can be increased, so that large area adaptors set in separated buildings or yards can be used as standby devices mutually.

73. 发明专利

JPH0629974A MULTIPLE ADDRESS COMMUNICATION METHOD 失效
公开(公告)号：JPH0629974A
公开(公告)日：1994-02-04
申请号：JP18018092
申请日：1992-07-08
申请人： HITACHI LTD
发明人： TAKASE MASAHIKO , TANABE SHIRO , ENDO NOBORU , TAKEYARI RIYOUJI , MISHINA YUSUKE , OUCHI TOSHIYA , YANAGI JUNICHIRO
IPC分类号： H04L12/18 , H04L12/28 , H04L12/46 , H04L12/66 , H04L12/70 , H04L12/761 , H04Q11/04 , H04L12/48
摘要： PURPOSE:To apply a protocol by a multiple address communication packet used for configuration control and exchange of address information in a LAN or the like to a LAN connected via a broad area network. CONSTITUTION:LANs 12 (12a-12e) installed dispersively are connected to a broad area network 1 via a terminal adaptor 11 (11a-11e) and the terminal adaptors 11 are interconnected by using a virtual line 13 (13a-13d) to form a bus type logic network. Each terminal adaptor 11 copies a cell arrived from the virtual line 13 allocated for multiple address communication and uses a preset virtual line 13 to transfer the cell to an adjacent terminal adaptor 11. Moreover, the terminal adaptor 11 composes part or all of transfer message from the received cell and transfers the copy of the cell depending on the content to an adjacent terminal adaptor 11 through a predetermined virtual line. Thus, in the case of multiple address communication to plural points, since it not required to generate lots of copied cells, high speed processing is attained. Furthermore, since no undesired copies are sent to a broad area network, traffic of the network is not increased.

74. 发明专利

JPH058602B2 失效
公开(公告)号：JPH058602B2
公开(公告)日：1993-02-02
申请号：JP14104383
申请日：1983-08-03
申请人： HITACHI LTD
发明人： TAKASE MASAHIKO , TAKAI ATSUSHI , YUMOTO OSAMU , HOTSUTA KYOMICHI
IPC分类号： H03F1/42

75. 发明专利

JPH0498917A SWITCHING METHOD WITHOUT SHORT BREAK FOR ATM TRANSMISSION LINE AND ITS CIRCUIT 失效
公开(公告)号：JPH0498917A
公开(公告)日：1992-03-31
申请号：JP21570890
申请日：1990-08-17
申请人： HITACHI LTD
发明人： NAKANO YUKIO , TAKASE MASAHIKO , TAKATORI MASAHIRO , YANAGI JUNICHIRO
IPC分类号： H04L1/22 , H04B1/74 , H04L12/70 , H04L12/801 , H04L12/911 , H04L29/14 , H04Q11/04
摘要： PURPOSE:To switch an ATM transmission line to an instaneous interruption with the processing at a reception side only by allowing the reception side to control a delay so that the content of a valid cell of an active transmission line and a valid cell of a standby transmission line is made coincident with each other. CONSTITUTION:Active cell buffers 41, 43 select only a valid cell in ATM cells sent from an active reception circuit 21, stores and delays it for a specific time. Similarly, standby cell buffers 42, 44 select only a valid cell in ATM cells sent from a standby reception circuit 22, stores and delays it for a specific time. Cell coincidence detection circuits 51-55 compare the content of the valid cell of the active reception signal with the content of the valid cell of the standby reception signal, revise the difference of the valid cells of the active reception signal and the standby reception signal so as to make the content coincident when the discordance of the contents is detected consecutively for a specific cell number or above. Then a system selective circuit 57 selects one of an output ATM cell of the active cell buffer and that of the standby cell buffer. Since no transmission/reception of control is required with a transmission side, instaneous interruption switching is attained also with respect to the reception signal of any kind of equipment.

76. 发明专利

JPH02195747A DIGITAL IMAGE TRANSMISSION SYSTEM 失效
公开(公告)号：JPH02195747A
公开(公告)日：1990-08-02
申请号：JP1391289
申请日：1989-01-25
申请人： HITACHI LTD
发明人： KINOSHITA TAIZO , TAKASE MASAHIKO
IPC分类号： H04N19/423 , H04J3/00 , H04L7/08 , H04N7/00 , H04N19/00 , H04N19/46 , H04N19/70
摘要： PURPOSE:To detect image block synchronization(phase) simultaneously by a synchronizing(phase) signal detected from a multitransmission frame by comprising the transmission frame after adjusting the information bit rate of the transmission frame and that of the block of an image signal at prescribed relation. CONSTITUTION:A system is comprised so that the transmission of (m)-th block of a digital image signal can be performed accurately with the l-th frame of the transmission frame 2 to perform the detection of transmission frame synchronization also with that of the image block synchronization. The picture(vertical) synchronizing signal 11 of an image can be attached, however, no block() synchronizing signal is required. Also, separation at every (m) blocks of the image is detected, and it is 1/m-frequency-divided, or a block counter provided in an image signal processing is reset by the synchronizing signal. In such a way, it is possible to perform the detection of block synchronization of the image simultaneosuly with the detection of transmission frame synchronization at a reception side, which requires no double constitution of a transmission synchronization detection circuit and an image synchronization circuit.

77. 发明专利

JPS6482723A TERMINAL STATE CONTROL METHOD 失效
公开(公告)号：JPS6482723A
公开(公告)日：1989-03-28
申请号：JP23872587
申请日：1987-09-25
申请人： HITACHI LTD
发明人： TAKASE MASAHIKO , TAKASAKI YOSHITAKA
IPC分类号： H04L12/40
摘要： PURPOSE:To evade an incoming failure state due to simple abnormality by informing other terminals connected to the same subscriber line terminal device that an incoming signal from a digital network can not be received owing to the abnormality. CONSTITUTION:A control part 14 decides whether or not an incoming corresponding terminal state analyzed by a terminal state analysis part 17 can be handled by a user side and when so, a terminal state information part informs respective terminals 11a-11c of the state of the corresponding terminal. A terminal which receives the report displays the contents of the kind and abnormal state of an incoming terminal to the user by a voice or display means, etc. When the user recognized that, the subscriber line terminal equipment is requested to hold the corresponding incoming call to take a necessary countermeasure for the incoming terminal, which outputs a setting end display signal to the subscriber terminal device thereafter. The subscriber line terminal equipment starts communicating according to the setting end display signal. Consequently, abnormality which can be handled on a subscriber side is processed on the subscriber side and then communication is started.

78. 发明专利

JPS6316796A SIGNAL TRANSMITTER 失效
公开(公告)号：JPS6316796A
公开(公告)日：1988-01-23
申请号：JP15978986
申请日：1986-07-09
申请人： HITACHI LTD
发明人： TAKASE MASAHIKO , IMOTO KATSUYUKI , TSUSHIMA HIDEAKI , SANO HIROHISA
IPC分类号： H04Q11/04 , H04L12/50
摘要： PURPOSE:To obtain a same function as usual with a transmission line having smaller capacity by combining a subscriber line terminating equipment and the various kinds of exchange with a loop shape transmission line, limiting the transmitting capacity into the one enough to use as usual and setting the constitution of a time division multiplexing frame transmitting through the loop shape transmission line to be variable according to the call from a subscriber side terminal. CONSTITUTION:Three kinds of information (a)-(c) are respectively inputted corresponding exchange a12, exchange b12' and exchange c12'' from relay lines 11, 11' and 11''. The respective exchanges 12, 12' and 12'' and the subscriber line terminating set 16 are combined in a loop shape with intra-office transmission lines 131-134 and a subscriber line 15. A subscriber line terminal station 14 executes the conversion of a transmission line code, etc., that is, the matching between the intra-office transmission lines 131 and 134 and the subscriber line 15. The subscriber line terminating equipment 16 makes the constitution of the time division multiplex frame on the loop shape transmission line alternate according to the calls generated from the respective terminals 17, 17' and 17''. The information about the constitution of the time division frame, which is set according to the calls generated from the respective terminals 17, 17' and 17'', is superposed on a frame signal F191.

79. 发明专利

JPS62199136A OPTICAL TRANSMISSION METHOD 失效
公开(公告)号：JPS62199136A
公开(公告)日：1987-09-02
申请号：JP4023986
申请日：1986-02-27
申请人： HITACHI LTD
发明人： TSUSHIMA HIDEAKI , TAKASE MASAHIKO , IMOTO KATSUYUKI
IPC分类号： H04B10/2507 , G02B6/00 , G02F1/03 , G02F1/13 , H04B10/00 , H04B10/25
摘要： PURPOSE:To send >=2 optical signals with low noise in two-way by applying an independent voltage having a frequency component higher than an information transmission signal frequency to each electrooptic crystal and converting an optical signal so as to be put equivalently in a non-polarization state. CONSTITUTION:The applied voltage to electrooptic crystals 1-1, 1-2 is changed while including a frequency component higher than an information transmission signal frequency of an optical signal passing through the crystals. In bringing the changing amplitude to a half wave voltage or over of the crystal, the phase difference of the electric field component different in the crystal axis direction of a transmitted optical signal between the crystals 1-1 and 1-2 is changed by >=+ or -180 deg. around the phase difference prior to the incidence and the changed frequency is higher than the frequency of an optical signal. Thus, the polarized state of the transmitted light signal through each crystal is brought into the equivalent non-polarization state in the observation at the frequency of the light information transmission signal. Further, each polarization axis of each crystal is arranged to 45 deg. and even when the incident light signal in one crystal is a linearly polarized light and its polarization axis is coincident with the Xi axis or the Yi axis, no polarization state is obtained.

80. 发明专利

JPS60205405A OPTICAL MODULE FOR BIDIRECTIONAL TRANSMISSION AND TRANSMISSION SYSTEM 失效
公开(公告)号：JPS60205405A
公开(公告)日：1985-10-17
申请号：JP6186584
申请日：1984-03-29
申请人： HITACHI LTD
发明人： IMOTO KATSUYUKI , TAKASE MASAHIKO , AOKI SATOSHI , YOSHIYA TSUTOMU , YAMADA YOSHIHARU
IPC分类号： H04B10/00 , G02B6/28 , G02B6/293 , G02B6/34
摘要： PURPOSE:To simplify the coupling adjustment of light and to enable bidrectional transmission for a long distance by fixing respectively integrally >=1 optical fibers which transmit the optical signal demultiplexed or multiplexed by interference film filters. CONSTITUTION:A rod lens 22 is provided with >=1 sheets of interference film filters 23, 24 having prescribed optical characteristics on the incident end side thereof and is provided with an optical fiber 7 for transmission on approximately the central axis. An optical fiber holding part 37 fixed and disposed integrally with an optical fiber 33 for demultiplexing which transmits the demultiplexed optical signal and an optical fiber 9' for multiplexing which is introduced with the demultiplexed signals and transmits the same so as to multiplex the signals is provided around said fiber. An optical module for bidirectional transmission is constituted by the above-mentioned parts which are integrally fixed and disposed. Such light modules are provided respectively on the up line and the down line and >=1 optical fibers are coupled to these light modules so that different wavelengths pass or reflect in these modules.

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