Method of searching fault locations in digital transmission line

Details Method of searching fault locations in digital transmission line Method of searching fault locations in digital transmission line

1984-02-10

1986-08-05

Atkinson, Charles E.

Excavating

17917531R, H04B 346

Patent

active

046047450

ABSTRACT:
A method of searching fault locations which is employed in a transmission system comprising a transmitting terminal having a transmitter for transmitting a digital signal; a receiving terminal having a receiver for receiving the digital signal; a plurality of repeaters which are placed between the transmitting and receiving terminals, and each of which receives and amplifies the digital signal from a preceding repeater section and deliver it to a subsequent repeater section; and a plurality of transmission lines for connecting the transmitter with the first repeater, the repeaters with each other and the final repeater with each other and the final repeater with the receiver, respectively. This method comprises the steps of coding an original signal to be transmitted in terms of two kinds of error detecting codes at the transmitting terminal to send out them from the transmitter; detecting an error of a received signal using one of the two kinds of error detecting codes at each repeater thereby to measure the error rate at one repeater section corresponding to each repeater; recoding a decoded received signal using the error detecting code employed to detect the error, and delivering it to a subsequent repeater section, and transmitting signals each of which represents the error rate at each repeater section measured at each repeater, to the transmitting terminal or receiving terminal.

REFERENCES:
patent: 3586968 (1971-06-01), Barjot
patent: 3895352 (1975-07-01), Chisholm et al.
patent: 4022988 (1977-05-01), Lentz et al.
patent: 4278850 (1981-07-01), Sato et al.
patent: 4354054 (1982-10-01), Bellisio
patent: 4455644 (1984-06-01), Fox et al.

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