Method and arrangement for loop test of a disturbed line

Details Method and arrangement for loop test of a disturbed line Method and arrangement for loop test of a disturbed line

2004-04-08

2008-09-16

Tran, Quoc D (Department: 2614)

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

Of trunk or long line

C379S001030, C379S028000, C379S029010

Reexamination Certificate

active

07426262

ABSTRACT:
The invention refers to single-ended test of a loop (2, 3). A test device (TD1) is connected to a remote device (3) via a line (2). The remote device is powered on and transmits intermittently handshake signals (HS1), which can disturb the loop test. A receiving and calculating unit (RE1) detects the handshake signals (HS1) and orders a sending unit (SD1) to send a halting signal (NAK-EF) to the remote device. The latter is halted for predetermined silent period of time, during which the test or a part of it is performed. If required the halting of the handshake signals is repeated. The test device sends a broadband loop test signal (S1) and receives a reflected signal (S2) during the silent period. A frequency dependent echo transfer function is generated from the signals (S1, S2) and is used for generating desired properties of the line (2) such as its length (L).

REFERENCES:
patent: 6584176 (2003-06-01), Murphree et al.
patent: 6876725 (2005-04-01), Rashid-Farrokhi et al.
patent: 7069165 (2006-06-01), Rosenberg et al.
patent: 2005/0008068 (2005-01-01), Stegherr
patent: 10154937 (2002-11-01), None

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