Method of and circuit for locating faults in a digital telecommu

Details Method of and circuit for locating faults in a digital telecommu Method of and circuit for locating faults in a digital telecommu

1983-11-29

1985-10-15

Schreyer, Stafford D.

Excavating

17917531E, 371 22, H04B 346

Patent

active

045476330

ABSTRACT:
For locating faults in digital telecommunication subscriber terminations various test loops (A, B, C) are closed and checked by signals transmitted via the exchange (16). When a fault is proved to exist in the so-called C-loop, it cannot be detected whether the fault is in the subscriber line (2) or in the network termination (1). In order to be able to distinguish between the two sources of fault, and when the subscriber line (2) is in an unobjectionable state, the filter coefficients which are continuously adjusted in a recursive filter contained in the echo canceller (24) of the subscribers group circuit (17), are stored. Since, in the case of a faulty subscriber line (2), the echo canceller (24), based on the received pulse answer, adjusts changed filter coefficients, it is possible to localize the location of fault by way of comparing the continuous coefficients with the stored coefficients.

REFERENCES:
patent: 3637954 (1972-01-01), Anderson et al.

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