Fault location system for a repeatered PCM transmission system

Details Fault location system for a repeatered PCM transmission system Fault location system for a repeatered PCM transmission system

1976-03-11

1978-02-28

Safourek, Benedict V.

Telegraphy

Systems

Printing

325 13, 178 71T, H04N 1702

Patent

active

040770044

ABSTRACT:
A PCM fault location system for repeaters and a code generator used therefor employ fault location codes generated on the basis of pseudo-random codes. The PCM fault location system transmits the codes through a repeatered transmission line, and the fault location codes including repeater transmission errors are received by the repeaters. A component of the repeater-designation frequency signal is extracted from the received fault location codes by means of a particular repeater-built-in fault locating circuit, and the thus extracted repeater-designation frequency component is received at a transmitting point of the fault location codes. The code generator employed at the transmitting point includes first means for obtaining codes which have an appropriate and sufficient difference in an average number of occurrences of digits "1" and "0" and are constructed using at least one series of pseudo-random codes, second means for controlling the state of the codes obtained by the first means in accordance with a repeater-designation frequency signal, and third means for performing differential code-conversion of the codes obtained by the second means.

REFERENCES:
patent: 3491298 (1970-01-01), De Jager et al.
patent: 3500202 (1970-03-01), Zegers
patent: 3798544 (1974-03-01), Norman
patent: 3906174 (1975-09-01), Dotter

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