Leakage detection in DOCSIS 3.1 environment

• US 10,187,112 B2
• Filed: 02/04/2016
• Issued: 01/22/2019
• Est. Priority Date: 02/04/2015
• Status: Active Grant

• Current Assignee: Viavi Solutions, Inc. (Lumentum Holdings Inc.)
• Original Assignee: Viavi Solutions, Inc. (Lumentum Holdings Inc.)
• Inventors: Sinde, Gary W., Emsley, Brett W., Stelle, IV, Raleigh B., King, Mathew A.
• Primary Examiner(s): Bayard, Emmanuel
• Application Number:
  US15/548,571
• Publication Number:
  US 20180019786A1
• Time in Patent Office: 1,083 Days
• Field of Search: 375130, 375137, 375150, 375224, 375260, 375343
• CPC Class Codes: H04B 3/46 Monitoring; Testing
• CPC Class Codes: H04J 11/00 Orthogonal multiplex systems, e.g. using WALSH codesH04J13/00 takes precedence

Abstract

Various methods of detecting leakage of a signal from a Data-Over-Cable Service Interface Specification (DOCSIS) 3.1 channel are disclosed, including using a DOCSIS 3.1-defined “exclusion band” to insert existing tagger-based test carriers, using a power signature algorithm to detect the presence of DOCSIS 3.1-defined pilot carriers, and using a time-based correlation technique to detect the presence of DOCSIS 3.1-defined cyclic prefixes.

Claims

1. A method for detecting leakage of a signal from a Data-Over-Cable Service Interface Specification (DOCSIS) 3.1 channel of a DOCSIS 3.1 system, the DOCSIS 3.1 system being configured to transmit signals using a modulation technique, the method comprising:

detecting a pair of sidebands generated by the modulation technique of the DOCSIS 3.1 system by determining if, within a frequency/spectral view of signal bandwidth, a predetermined pattern exists,

determining whether a carrier frequency is present between the pair of sidebands, and

determining, based on the detected pair of sidebands and the presence of the carrier frequency between the pair of sidebands, that the signal originates from a particular source.

2. The method of claim 1 further comprising checking for amplitude matching between the pair of sidebands.

3. The method of claim 2, further comprising determining a carrier frequency amplitude difference from each sideband, wherein determining, based on the detected pair of sidebands and the presence of the carrier frequency, that the signal originates from a particular source includes determining that the signal originates from a particular source when the carrier frequency amplitude difference from either sideband is correct.