Intelligent loop diagnostics for digital subscriber line services to support a service assurance system

US9071678B2 · kind B2 · utility

Assignee

• AT&T Intellectual Property I, L.P. · US

Inventors

• Chen-Yui Yang · Marlboro, US
• Paritosh Bajpay · Edison, US
• David H. Lu · Morganville, US
• Raghvendra Savoor · Walnut Creek, US
• Anthony M. Srdar · Gainesville, US
• Jin Wang · Waretown, US
• Xidong Wu · San Ramon, US
• Xiaochuan Yi · Danville, US

Key dates

• Filing date: Mar 5, 2013
• Grant date: Jun 30, 2015
• Expiry date: Oct 12, 2033

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04M11/062
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

Abstract

A method of diagnosing a transmission loop in an Internet protocol television (IPTV) network includes configuring the loop as an open loop and performing a single-ended loop test (SELT), configuring the loop as a terminated-loop and performing another SELT, subtracting a trace of the first SELT from a trace of the second SELT, and determining the length of the loop from the result. A service assurance system in an IPTV network includes a test module and a DSLAM coupled to a residential gateway by a transmission loop. The test module operates to determine that a fault condition on the IPTV network is caused by a fault in the loop, direct the DSLAM to perform an open loop SELT and a terminated-loop SELT on the loop, receive the results of the SELTs, and determine a location of a tap on the loop based upon the results.