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1. 发明专利

JPH08139731A DUPLEX TRANSMISSION SYSTEM SWITCHING METHOD 失效
公开(公告)号：JPH08139731A
公开(公告)日：1996-05-31
申请号：JP27401694
申请日：1994-11-08
申请人： FUJITSU LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： ABIRU SETSUO , KAWAI MASAAKI , SHINOMIYA TOMOHIRO , TAJIMA KAZUYUKI , HIROTA MASAKI , MIYABE MASATAKE , AOYANAGI SHINICHI
IPC分类号： H04L1/22 , H04L12/28 , H04L12/70 , H04L12/56
摘要： PURPOSE: To provide a duplex transmission switching method which can assure the continuity of data even when the working and stand-by systems are switched to each other in a duplex transmission system. CONSTITUTION: This switching method includes a pair of transmission systems consisting of buffer memories 100 which store the input data, transmission parts 200 which extract the data out of the memories 100 and send them to the transmission lines 400 and these lines 400 which connect the parts 200 to a common reception part 600. In a duplex transmission system where one of both transmission systems that is designated as a working system transmits the input data to the part 600, a comparison means 700 is provided to compare the data stored in both memories 100 with each other to secure the coincidence between the data stored in the memory 100 of a stand-by transmission system and the data stored in the memory 100 of the working transmission system.

2. 发明专利

JP2001060921A POINT-MULTIPOINT OPTICAL COMMUNICATION SYSTEM 失效
公开(公告)号：JP2001060921A
公开(公告)日：2001-03-06
申请号：JP23282999
申请日：1999-08-19
申请人： MITSUBISHI ELECTRIC CORP , NIPPON TELEGRAPH & TELEPHONE
发明人： MOTOJIMA KUNIAKI , AOYANAGI SHINICHI
IPC分类号： H04B10/07 , H04B10/2507 , H04B10/27 , H04B10/272 , H04B10/293 , H04B10/564 , H04B10/572 , H04J3/00 , H04J14/08 , H04L12/44 , H04B10/20 , H04B10/04 , H04B10/06 , H04B10/14
摘要： PROBLEM TO BE SOLVED: To suppress the deterioration of a reception sensitivity without thoroughly maintaining and managing the connecting state of a connection member such as an optical connector by reducing the transmission level of an incoming optical signal to reduce the reception level of an incoming signal at a station side device through the use of a subscriber side device when the reception level of an outgoing optical signal from the station side device is higher than a prescribed level. SOLUTION: The subscriber side receiver 14 of the subscriber side device converts the outgoing optical signal to be inputted from the station side device with a subscriber side wave length multiplex optical circuit 15 into an electric signal by a light receiving photodiode 17 and it is amplified by an amplifier 18. A level detecting circuit 20 compares the output level of the amplifier 18 with a prescribed output change-over threshold and outputs a judging signal corresponding to the comparison result. An optical output control circuit 25 outputs a light amount indicating signal to a driving circuit 22 to output a light amount by a level corresponding to the judging signal based on the output of a monitor photodiode 24 and, in response to it, the driving circuit 22 controls the light emitting amount of a semiconductor laser element 23.

3. 发明专利

JPH07135508A ATMHEC SYNCHRONIZATION CIRCUIT 失效
公开(公告)号：JPH07135508A
公开(公告)日：1995-05-23
申请号：JP30597193
申请日：1993-11-11
申请人： ANRITSU CORP , NIPPON TELEGRAPH & TELEPHONE
发明人： ISHII SEISHIRO , MOGI MASAHIDE , AOYANAGI SHINICHI
IPC分类号： H04L29/02 , H04L7/00 , H04L7/08 , H04L12/28 , H04Q3/00
摘要： PURPOSE:To realize the cell synchronization system with distributed sample scrambler used for a cell base ATM interface and to conduct an error correction operation for a full 8-bit syndrome normally required in the same timing. CONSTITUTION:A high-order 2-bit of a HEC code is extracted from the midway of a syndrome generation matrix circuit 1e by providing a bit extract circuit 1f. That is, an extract timing is extracted from a timing in 4-bits before a synchronization pattern detection timing and used for the synchronization operation of a cyclic local PRBS generating circuit 7. A syndrome high-order two-bits descrambled from a transfer bit collation circuit 5 are outputted in a timing coincident with low-order 6-bits of the syndrome from an HEC arithmetic circuit 1. A syndrome combining circuit 11 combines syndromes of full 8-bits and the result is given to an error correction circuit 9.

4. 发明专利

JPH07135506A ATM TRANSMITTER 失效
公开(公告)号：JPH07135506A
公开(公告)日：1995-05-23
申请号：JP30596993
申请日：1993-11-11
申请人： ANRITSU CORP , NIPPON TELEGRAPH & TELEPHONE
发明人： ISHII SEISHIRO , MOGI MASAHIDE , AOYANAGI SHINICHI
IPC分类号： H04L7/08 , H04L12/26 , H04L12/28 , H04L12/44 , H04Q3/00
摘要： PURPOSE:To verify transmission delay quantity control state by FPAC through the use of a measurement P cell by adjusting a transmission delay quantity setting value for the measurement P cell with the FPAC even when the transmission delay is measured by the measurement P cell. CONSTITUTION:A FPAC/TSI extract circuit 7 extracts an FPAC and a TSI from a P cell of a TS addressed to its concerned station. A TSI busy state detection circuit 8 detects a TS busy state display from the extracted TSI. A P cell transmission circuit 15 and a user cell transmission circuit 14 send the burst signal of a measurement P cell (P cell only) as a transmission delay time measurement cell for a TS when the TS is not in use. When the TS is in use, (P cell + user information) is sent in an incoming TS whose number is the same as the TS. An FPAC validity detection circuit 9 detects whether or not an FPAC valid display set by an SLT is valid to control a transmission delay.

5. 发明专利

JPH0530554A SPACE DIVISION TYPE OPTICAL SIGNAL SELECTING CIRCUIT 失效
公开(公告)号：JPH0530554A
公开(公告)日：1993-02-05
申请号：JP17970591
申请日：1991-07-19
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： SUZUKI YASUNAO , SANO KOICHI , AOYANAGI SHINICHI
IPC分类号： G02B6/28 , H04B10/27 , H04B10/272 , H04B10/29 , H04N7/22 , H04N21/647 , H04Q3/52
摘要： PURPOSE:To provide a compact and low-power consumptive circuit capable of selectively connecting individual optical signals respectively inputted to M optical fibers to all of N outputs. CONSTITUTION:This space division type optical signal selecting circuit is provided with an optical branching circuit 2 for N-branching respective signals outputted from M optical fibers, (MXN)-channel two-dimensional switches 6 for respectively turning on and off respective outputs from the circuit 2 and N optical OR circuits 7 for combining respective outputs from the switches 6 to N-channel optical outputs in each M channel. In this constitution, N optical outputs can be obtained from M optical inputs. Consequently this selecting circuit can be utilized for image distribution service.

6. 发明专利

JPH03178230A CIRCUIT BOARD AND BOARD UNIT 失效
公开(公告)号：JPH03178230A
公开(公告)日：1991-08-02
申请号：JP31733289
申请日：1989-12-06
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： KOKUBU TOSHINAO , SANO ZOUICHI , AOYANAGI SHINICHI
IPC分类号： H04B10/00 , H04B10/112 , H04B10/80 , H04L12/40 , H05K1/02 , H05K1/14
摘要： PURPOSE:To effectively utilize a free space between boards and to attain optical connection with high density by providing a means leading an optical signal sent from a light emitting element to a light receiving element arranged between a circuit board provided with the light emitting element and a circuit board provided with the light receiving element opposite to the light emitting element onto the board. CONSTITUTION:A circuit board 1-1 with a light emitting element 2-1 mounted thereon and a circuit board 1-4 with the light receiving element 3-1 mounted thereon are arranged opposite to each other, and a light sent from the light emitting element 2-1 of the circuit board 1-1 is detected directly through a space by the light receiving element 3-1 of another circuit board 1-4 to apply optical connection. Moreover, when one or plural circuit boards 1-2, 1-3 held between the circuit boards is present thereon, means 4-1, 4-2 leading the light through the use of transmission, deflection or reflection, etc., provided on the circuit boards lead the light from the light emitting element 2-1 to the light receiving element 3-1 for the detection. Thus, the optical connection of the circuit boards separated from each other is implemented dynamically, the space between the circuit boards is utilized effectively and the wiring density between the space of the boards is improved.

7. 发明专利

JPH02282226A SYSTEM FOR COMPENSATING OPTICAL BRANCHING LOSS 失效
公开(公告)号：JPH02282226A
公开(公告)日：1990-11-19
申请号：JP10403789
申请日：1989-04-24
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： SANO KOICHI , AOYANAGI SHINICHI , KIKUSHIMA KOJI
IPC分类号： G02F1/35 , H01S3/06 , H01S3/067 , H01S3/07 , H04B10/27 , H04B10/272 , H04B10/29 , H04B10/291
摘要： PURPOSE:To allow the packaging at a higher density and the reduction of a size and cost and to compensate a light loss by connecting a rare earth element-added optical fiber amplifier for amplifying the exit/incident light in a port according to the intensity of incident exciting light to one port side. CONSTITUTION:The signal light transmitted from a light transmitter/receiver 1 of a central telephone exchange TEX arrives at a bright line point FDP while being subjected to an attenuation effect in an optical fiber 4. On the other hand, the exciting light emitted from a light source 6 passes the optical fiber 7 and arrives at the bright line point FDP. This light is multiplexed with the signal light in an optical multiplexer/demultiplexer 8. The multiplex light is made incident to the optical fiber amplifier 9 where the signal light is amplified by a prescribed gain. The amplified signal light is made incident through the filter 10 to one port on the central telephone exchange TEX side of an optical star coupler 2 where the light is branched by N. The branched light rays are propagated in the respective optical fibers 5-1 to 5-N and are received in respective light transmitter/receivers 3-1 to 3-N on a subscriber SUB side. The exciting light is shut off in the filter 10 and is thereby prevented from arriving at the optical star coupler 2.

8. 发明专利

JPH0233234A ERROR PROPAGATION COMPENSATION METHOD 失效
公开(公告)号：JPH0233234A
公开(公告)日：1990-02-02
申请号：JP18404188
申请日：1988-07-22
申请人： NIPPON TELEGRAPH & TELEPHONE , MITSUBISHI ELECTRIC CORP
发明人： OKADA KENJI , AOYANAGI SHINICHI , NIIFUKU TAKESHI , OSHIMA KAZUYOSHI
IPC分类号： H04B14/06
摘要： PURPOSE:To prevent propagation of error while keeping the picture quality by replacing a decoding signal at the latter into the former decoding signal and using a prediction circuit so as to obtain a prediction value if a difference between consecutive adjacent decoding signals exceeds a threshold value. CONSTITUTION:A prediction start position is substituted to a parameter (i) at first. The (i-n)th decoded value Xi-n is substituted to a prediction value Pi to set a prediction value. Whether or not a deference Xi-Xi-n1 of adjacent decoding signals exceeds a threshold value is compared to apply decision of error. If the difference exceeds the threshold value, the decoded value Xi is replaced into the value Xi-m to correct the decoding signal. Then '1' is added to the parameter (i). Whether or not the parameter (i) exceeds the prediction end location is compared to decide the end of prediction. If the parameter (i) exceeds the prediction end location, the prediction is terminated.

9. 发明专利

JPS63312687A LASER DIODE DRIVE CIRCUIT 失效
公开(公告)号：JPS63312687A
公开(公告)日：1988-12-21
申请号：JP14997687
申请日：1987-06-15
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： AOYANAGI SHINICHI , TOKURA NOBUYUKI , YOSHINAGA HISAO
IPC分类号： H04B10/00 , H01S5/042 , H01S5/06 , H04B10/54
摘要： PURPOSE:To drive a laser diode where an N-type conductivity region side is earthed and provide a laser diode drive circuit which is fit for a TTL circuit and is operated with a positive power source as well by using a high speed NPN transistor. CONSTITUTION:The N-type conductivity region side of a laser diode 11 is earthed and its P-type conductivity region side is connected to emitters of NPN transistors 21 and 22. The laser diode 11 is directly driven by the NPN transistor 22 and a constant current which is determined by a constant current circuit 47 flows through a PNP transistor 24. Since the control of the transistor 24 determines whether it allows currents to flow through the base of transistor 22 or transistor 37, this control makes it possible to perform a high speed operation. Further, as circuits are operated by a positive power source, the drive of the laser diode by the output of a TTL circuit makes the interface between the TTL circuit and laser diode drive circuit simple.

10. 发明专利

JPS63163805A LIGHT SOURCE WITH OPTICAL FIBER 失效
公开(公告)号：JPS63163805A
公开(公告)日：1988-07-07
申请号：JP31282986
申请日：1986-12-26
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： TOKURA NOBUYUKI , HASHIMOTO HITOSHI , AOYANAGI SHINICHI
IPC分类号： G02B6/42
摘要： PURPOSE:To obtain superior productivity without increasing dispersion in characteristics among products nor decreasing the yield by interposing a multicore optical fiber between a light emitting body and an optical fiber when both are connected with each other. CONSTITUTION:A spacer 4 which has a flat top surface for light emitting element fixation and a spacer 5 for multicore optical fiber fixation which has a groove or hole for guidance are fixed in a case 1, and the light emitting element 2 such as a laser diode chip or LED chip is fixed on the spacer 4. Then the multicore optical fiber 3 is placed in the guide groove of the spacer 5 and fixed with an adhesive. At this time, the multicore optical fiber 3 is fixed at such a distance that the size of a light spot on the input-side end surface of the multicore optical fiber 3 is larger than the diameter of one core 3a of the multicore optical fiber 3. Consequently, a coupling method which causes no position deviation is obtained, high productivity is obtained, and high yield is maintained.

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