The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 16, 2008
Filed:
Apr. 08, 2004
Jonas Rosenberg, Bromma, SE;
Jonas Rosenberg, Bromma, SE;
Telefonaktiebolaget L M Ericsson (Publ), Stockholm, SE;
Abstract
The invention refers to single-ended test of a loop (). A test device (TD) is connected to a remote device () via a line (). The remote device is powered on and transmits intermittently handshake signals (HS), which can disturb the loop test. A receiving and calculating unit (RE) detects the handshake signals (HS) and orders a sending unit (SD) 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 (S) and receives a reflected signal (S) during the silent period. A frequency dependent echo transfer function is generated from the signals (S, S) and is used for generating desired properties of the line () such as its length (L).