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:
Jun. 08, 2004
Filed:
May. 22, 2001
David B. Lazarus, Elkins Park, PA (US);
Jeffrey D. Ollis, Harleysville, PA (US);
James D. Rosemary, Claymont, DE (US);
General Instrument Corporation, Horsham, PA (US);
Abstract
In one embodiment, a test tone is placed in an outbound path of a full-duplex transmission system. An echo cancellation capability is disabled, enabling an echo signal of the test tone to pass through the inbound path of the full-duplex transmission system, which echo signal is analyzed to determine the condition of the full-duplex paths. In another embodiment a standard DSP generates DTMF tones which are looped-back and tested by the DSP, under control of a CPU. The DSP is a standard DSP avoiding the need for any hardware/software modification of the DSP to perform the test mode. The tests are performed the local level, i.e. at the subscriber's location, eliminating the need for central office intervention, for example.