Method and communication arrangement for testing subscriber...

Details Method and communication arrangement for testing subscriber... Method and communication arrangement for testing subscriber...

2004-07-30

2009-06-16

Tran, Phuc H (Department: 2416)

Multiplex communications

Diagnostic testing

Loopback

C370S241000, C379S001010

Reexamination Certificate

active

07548516

ABSTRACT:
To test at least one subscriber line that can be connected to a line unit, at least one test signal is emitted along the subscriber line, when the latter is not actively connected, and at least one resultant first echo signal is received, recorded and stored. In the short-circuited or open condition of the subscriber line, the test signal or signals is/are emitted via said line and at least one resultant second echo signal is stored. If an error occurs, the test signal or signals is/are emitted along the subscriber line and at least one resultant error echo signal is recorded, said error echo signal being compared with the first and/or second echo signal or signals. The advantage of the invention is that the location of an interruption in the subscriber line can be determined locally without the use of complex measuring devices.

REFERENCES:
patent: 4989202 (1991-01-01), Soto et al.
patent: 6266348 (2001-07-01), Gross et al.
patent: 6895081 (2005-05-01), Schmidt et al.
patent: 2002/0172329 (2002-11-01), Rashid-Farrokhi et al.
patent: 2006/0251221 (2006-11-01), Rosenberg
patent: 196 50 974 (1998-06-01), None
patent: 101 54 937 (2002-11-01), None
patent: WO 02/13405 (2002-02-01), None

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