PURPOSE: To ensure a detection for the regenerative repeater having a fault, by installing the logic operation means plus the pulse signal generating means which generates the different pulse signals to plural numbers of regenerative repeaters.
CONSTITUTION: The test pulse is transmitted to the repeater 15 and then to the amplifier 15-1 as well as to the input terminal (b) of the logic circuit 15-2 each. In case some fault arises to the repeater 15, the amplifier 15-1 does not generate the output synchronized with the test pulse supplied. And thus "1" is delivered to the output terminal (c) of the circuit 15-2. On the other hand, the 1/n2 pulse generating circuit 15-3 generates the pulse signal having the 1/n2 cycle compared with the test pulse cycle. Accordingly, the occurrence of fault can be detected for the repeater 15 by detecting the said pulse signal at the receiving terminal.
KAMIYAMADA KUNIYOSHI
SUMITANI HAJIME
