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1. 发明专利

JPH11127278A METHOD FOR MONITORING STATE OF POWER SOURCE 失效
公开(公告)号：JPH11127278A
公开(公告)日：1999-05-11
申请号：JP28706797
申请日：1997-10-20
申请人： HITACHI LTD , NIPPON TELEGRAPH & TELEPHONE , NEC CORP , FUJITSU LTD , OKI ELECTRIC IND CO LTD , OKI TEC KK
发明人： SHIMIZU MOTOAKI , TENTOU TAKEYUKI , YAMANO SEIICHI , TSUCHIYA MASARU , KUDO TOSHIYUKI , ICHIKAWA HIDEKAZU , OMORI SHOICHI , KIKUCHI AKIRA , KOMATSU KAZUTOSHI , KONDO KATSUHIRO
IPC分类号： H04J3/00 , H04B3/46 , H04M19/08
摘要： PROBLEM TO BE SOLVED: To surely detect a fact that a customer station device is left under a state of power interruption by a host device when the device is left under such a state. SOLUTION: In case of the power interruption, the state of a power source, i.e., the state of the power interruption in the customer station device 1 is easily and surely detected from power source state information set in a normal data frame if data framed 1 to 3 from the device 1 are successively received by the host device 8 and at least either one of the data frames 1, 2 is normal when the normality of the data frames received by the host device 8 is checked by a cyclic code in the data frame which is received immediately before the data frame to be checked.

2. 发明专利

JPH03256416A PCM SIGNAL MULTIPLEXING CIRCUIT 失效
公开(公告)号：JPH03256416A
公开(公告)日：1991-11-15
申请号：JP5360390
申请日：1990-03-07
申请人： HITACHI LTD
发明人： TENTOU TAKEYUKI
IPC分类号： H04J3/02
摘要： PURPOSE:To reduce hardware quantity in a multiplexing circuit and to attain profitability by multiplexing the data of an audio signal, etc., with a slow data signal comprehensively. CONSTITUTION:Every kind of signal in which the output of the audio signal, SS and SR signals, and a data signal are multiplexed at every channel is written once on a read/write memory RAM via a buffer BUF. At such a time, the audio signal and the SS, SR signals not requiring the movement of a multiplex position are multiplexed with an N-to-1 selector SEL, and the signals requiring the movement of the multiplex position are written on a memory RAM once, and are read out at the multiplex position, and are multiplexed to one multiplex signal with the N-to-1 selector SEL. In such a way, the hardware quantity can be reduced, which attains the profitability.

3. 发明专利

JPH0294717A TEST SYSTEM FOR OPTICAL LINE TERMINATOR 失效
公开(公告)号：JPH0294717A
公开(公告)日：1990-04-05
申请号：JP24401288
申请日：1988-09-30
申请人： HITACHI LTD
发明人： TENTOU TAKEYUKI
IPC分类号： H04B10/00 , H04B10/077 , H04B10/079 , H04L29/14 , H04M3/22
摘要： PURPOSE:To reduce the test time and the test result time by providing a self- diagnostic function to an optical line terminator. CONSTITUTION:A center and an optical line terminator are connected and a test signal is inputted from a point A to attain the test of an incoming bus from the center. The center inputs the test signal and the said signal is inputted to a test signal detection section at a point B of the optical line terminator to attain the test of an outgoing bus. Moreover, the test signal is inputted from a SW2 at the point B, a SW1 reflects a DATAOUT to a DATAIN to input the data to the test signal detection section at the point A thereby attaining the test of a user interface section in the terminator. The result is inserted in the signal of the incoming line to allow the center to recognize the result of test.

4. 发明专利

JPH03271907A CIRCUIT FOR PREVENTING DROP-OUT OF DATA ON BUS FOR HOT-LINE INSERTION AND REMOVAL 失效
公开(公告)号：JPH03271907A
公开(公告)日：1991-12-03
申请号：JP6961790
申请日：1990-03-22
申请人： HITACHI LTD
发明人： FUJII HIDEHIRO , TAKANO MITSUHIRO , TENTOU TAKEYUKI
IPC分类号： G06F1/18 , G06F3/00
摘要： PURPOSE:To prevent drop-out of data on a bus line by connecting a transistor TR to the output of an open collector output buffer of an electronic circuit package and temporarily keeping this TR turned off by a time constant circuit after insertion of the electronic circuit package. CONSTITUTION:The output of an open collector output buffer G1 of the electronic circuit package is connected to the base of a transistor TR Q1, and turning-on/off of the TR Q1 is controlled by the time constant circuit consisting of a TR Q2, resistances R1 to R4, and a capacitor C1. That is, though a supply voltage V1 is applied when the electronic circuit package is inserted, the TR Q2 is temporarily turned off to open the TR Q1 after package insertion because the base current of the TR Q2 has a time constant. Thus, data is prevented from being outputted to the bus till the start of the normal operation after insertion of the electronic circuit package, and drop-out of data of another electronic circuit package on the bus is prevented.

5. 发明专利

JPH0220137A SUBSCRIBER LINE MULTIPLE CONVERTER 失效
公开(公告)号：JPH0220137A
公开(公告)日：1990-01-23
申请号：JP16876488
申请日：1988-07-08
申请人： HITACHI LTD , TOKYO TELECOM NETWORK , OKI ELECTRIC IND CO LTD , NEC CORP , FUJITSU LTD
发明人： TENTOU TAKEYUKI , SAKAI TOMIO , TAKAHASHI HIROAKI , MOCHIZUKI TAKASHI , SATO KENICHI , SHIROMIZU YASUBUMI , SEKIGUCHI ISAMU
IPC分类号： H04J3/04 , H04J3/22
摘要： PURPOSE:To improve the efficiency of an actual use line and to miniaturize a device by connecting a TSI switching part and the subscriber line corresponding part having a line termination function corresponding to the classification of the device by a common interface having a prescribed transmitting speed. CONSTITUTION:A 6.3M interface part 1 at the station inside passes through a station side multiple separating part 2 and executes the line setting with a TSI(Time Slot Interchanger) switching part 3 of one surface constitution. A signal distributed by a switch passes through a subscriber multiple separating part 6 and is connected with a subscriber corresponding part 17 by a 2Mb/s common interface part 7. The subscriber corresponding part 17 is constituted of the 2Mb/s common interface part 7, a line termination part 13-1 and an interface part 14-1 as one example. Further, when the data communication service of the subscriber is increased, the subscriber corresponding part composed of a line termination part 13-2 and a 1.5Mb/s interface part 14-2 is added and thus, the extending can be executed. Thus, even for the device, in which the transmission speed and the frame constitution of an interface signal 15 at the subscriber side are different, the line termination can be executed by a line termination part 13 of the subscriber corresponding part, the extendability to another service is obtained.

6. 发明专利

JPS59221043A PCM-D AND I TYPE TERMINAL EQUIPMENT 失效
公开(公告)号：JPS59221043A
公开(公告)日：1984-12-12
申请号：JP9408383
申请日：1983-05-30
申请人： HITACHI LTD
发明人： FUNADA TAKASHI , TENTOU TAKEYUKI
IPC分类号： H04J3/08
摘要： PURPOSE:To facilitate an easy connection of a channel board when the number of channels is increased and to improve the maintainability by designating a up or down circuit according to the connecting position of the channel board, therefore making the occurrence of a channel setting error difficult. CONSTITUTION:Common parts 11 and 12 are connected to up and down PCM circuits respectively, and the signals related to channels needed by own station are transmitted and received with the PCM circuits. The undesired signals related to channels are sent to both PCM circuits. The exclusive up channel means CHP1(A)-CHP3(A) are provided at the part 11 and a termination equipment 6, and transmission/reception is carried out for the channels needed by own station. While the exclusive down channel means CHP1(B)-CHP3(B) are provided between the equipment 6 and the part 12. These exclusive channel means have plural channel parts and allot independently the minimum necessary own channel parts. Then a wired OR connection is devised between the rest channel parts and the equipment 6 corresponding to numbers opposite to each other to use the channels by the up or down PCM circuit. Then the wired OR output is led to the equipment 6.

7. 发明专利

JPS56106447A SIGNAL DECODER 失效
公开(公告)号：JPS56106447A
公开(公告)日：1981-08-24
申请号：JP782580
申请日：1980-01-28
申请人： HITACHI LTD
发明人： TENTOU TAKEYUKI
IPC分类号： H03M1/02 , H04B14/04
摘要： PURPOSE:To reduce the cost of a decoder, by realizing a common use of a D/A converter for both coding and decoding even in case the received PCM signal is not synchronous with the transmitted PCM signal. CONSTITUTION:The side of transmission includes the oscillator 5 which produces the clock having the frequency 2fD double the frequency fO of the transmitted PCM signal clock, the modulator 1, front-stage amplifier 2, the sample holding amplifier 3, the comparator 4 and the code logical circuit 6. The side of reception includes the decoding logical circuit 16, the decoding selection circuit 15 which selects the decoding period, the D/A converter 14, the rear-stage amplifier 12, the parallel- connection sample holding amplifiers 17 and 18, and demodulator 11.

8. 发明专利

JP2001333474A DIGITAL ACCESS SYSTEM 失效
公开(公告)号：JP2001333474A
公开(公告)日：2001-11-30
申请号：JP2000152746
申请日：2000-05-19
申请人： HITACHI LTD
发明人： FUJII HIDEHIRO , TENTOU TAKEYUKI , MORI TAKASHI , SEKIGUCHI MINORU , MAKINO MASATOSHI
IPC分类号： H04J3/22 , H04L12/66 , H04M3/00 , H04M7/00 , H04N7/173 , H04N21/24 , H04Q3/42 , H04Q3/60 , H04Q11/04
摘要： PROBLEM TO BE SOLVED: To provide a digital access system that can enhance the effective communication rate of each subscriber channel. SOLUTION: A subscriber communication rate controller 4 is provided to at least either of a subscriber line accommodating station 1 and an inter-network connection station 3, the communication rate of each subscriber channel is monitored and the allowable communication rate of each subscriber channel on a relay channel is controlled in response to an idle capacity of the relay channel 2.

9. 发明专利

JPH04119740A REMOTE MONITOR CONTROL METHOD 失效
公开(公告)号：JPH04119740A
公开(公告)日：1992-04-21
申请号：JP23906290
申请日：1990-09-11
申请人： HITACHI LTD
发明人： TENTOU TAKEYUKI
IPC分类号： H04J3/14 , H04B3/46 , H04L12/40
摘要： PURPOSE:To improve the line utilizing efficiency by using a control line interface section to link a control line from a specific center station to all remote stations together via a transmission line through bus structure thereby accessing a remote station from the center station. CONSTITUTION:A transmission data (Tx) from a control signal 1 of a center station 7 is multiplexed by a multiplexer section 4 via a control line interface 2 and the result is sent to a transmission line 9. Each of the center station 7 and a remote station 81 or the like uses the multiplexer section 4 so as to demultiplex the transmission data (Tx) and the demultiplexed data is sent to a monitor control section 6 via the control line interface 2 to form the line for the transmission data (Tx). The control line interface 2 ORs between a reply data (A) from the monitor control section 6 and a reply data (B) from other station and gives a resulting reply data (C) to the multiplexer section 4 and gives a final reply data (Rx) to the control section 1 of the center station 7 through the line for the reply data (Rx) for each of the center station 7 and the remote station 81 or the like.

10. 发明专利

JPH0319436A OPTICAL SUBSCRIBER SYSTEM 失效
公开(公告)号：JPH0319436A
公开(公告)日：1991-01-28
申请号：JP15232289
申请日：1989-06-16
申请人： HITACHI LTD
发明人： TENTOU TAKEYUKI , FUJII HIDEHIRO
IPC分类号： H04B10/27 , H04B10/272
摘要： PURPOSE:To decrease the total installation distance number between a center and a subscriber and the number of installation of reception sections by sending the same signal from the center to plural subscribers and sending a transmission signal of each subscriber from the subscriber tot he center in terms of a burst signal. CONSTITUTION:A distribution signal is sent to plural subscribers 21-2n via an optical fiber 5 from the center 1 and sent to each subscriber via an optical demultiplexing means 3 disposed on a point where subscribers are concentrated. Moreover, an incoming signal by the burst signal is sent to a 2nd optical fiber 6 via an optical multiplexing means 4 disposed on a point where subscribers are concentrated based on a subscriber relevant control signal received by the subscribers 21-2n and the signal is sent to the center 1. Even when the signal is sent from plural subscribers, the incoming signals are sent to the center 1 without occurring collision. Then the cost of the optical fiber installation and the number of transmission/reception sections between the center 1 and the subscribers 21-2n are reduced.

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