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    • 8. 发明专利
    • OPTICAL TRANSMISSION AND RECEPTION CIRCUIT
    • JPS5838040A
    • 1983-03-05
    • JP13505381
    • 1981-08-28
    • SUMITOMO ELECTRIC INDUSTRIES
    • SAKAMOTO FUKUMA
    • H04B10/556H04B10/00H04B10/524H04L25/32H04L25/49
    • PURPOSE:To decrease the power consumption of a photoelectric element, by generating and transmitting a plurality of optical pulse trains corresponding to one pulse of a transmission signal, converting them into electric pulses at a receiving side and restoring them into transmission signal pulses with a delay of prescribed time. CONSTITUTION:In inputting a transmission signal pulse SD, DELTAT of width, a monostable multivibrator IC1 generates a pulse having a width determined with a resistor R1 and a capacitor C1, e.g., T1=27 mus and a monostable multivibrator IC2 is driven from the output terminal -Q. The IC2 generates a sub-pulse having 3 mus (T2=C2R2) of width to illuminate a light emission diode LED and the signal is transmitted via an optical fiber OF. The sub-pulse is transmitted for n pulses during the DELTAT with T1+T2 of period and T2/T1+T2=0.1 of duty cycle. At the receiving side, this optical pulse is converted into an electric signal, which is shaped to drive a monostable multivibrator IC3. The IC3 drives a monostable multivibrator IC4 with a pulse in which the start point of the pulse has a delay of prescribed time of C3R3=T3=60mus. The IC4 restores the pulse into the pulse, DELTAT of width, by making a pulse delay for a prescribed time as the start point and extended by C4R4=T4=57mus.
    • 9. 发明专利
    • BINARY CODE TRANSMISSION SYSTEM
    • JPS5685958A
    • 1981-07-13
    • JP15340379
    • 1979-11-27
    • FUJITSU LTD
    • MURANO KAZUOYAMAGUCHI KAZUOMURAKAMI NORIOTSUDA TOSHITAKA
    • H04L25/02H04L25/03H04L25/32H04L25/49
    • PURPOSE:To easily monitor the line by the receiving side as to whether there is a fault or not, by inserting a pulse of narrow width by the reverse polarity when the same code of an asynchronous data has continued exceeding the prescribed length, in the system for transmitting a binary asynchronous data. CONSTITUTION:When the same code of an asynchronous data (a) provided to the input terminal 1 of the transmission side has continued exceeding T1, a refresh pulse of pulse width T0 which is narrower than the minimum width T of the asynchronous data is inserted by the reverse polarity. The receiving side executes decoding by disregarding the refresh pulse having relation of T>>T0, and makes it a regenerated receiving code (c). At the normal time, the refresh pulse of the reverse polarity is inserted at every T1 of the same code, and therefore, it becomes easy to monitor the line by the receiving side as to whether it is a fault or not. Moreover, since not only the transmission becomes easy due to decrease of the DC component but also the refresh pulse is inserted even if the original code continues ''0'', the AGC can be operated by detecting the level.