LEAKAGE DETECTION IN DOCSIS 3.1 ENVIRONMENT

• US 20180019786A1
• Filed: 02/04/2016
• Published: 01/18/2018
• Est. Priority Date: 02/04/2015
• Status: Active Grant

• Current Assignee: Viavi Solutions, Inc. (Lumentum Holdings Inc.)
• Original Assignee: Trilithic Incorporated (Lumentum Holdings Inc.)
• Inventors: SINDE, Gary W., EMSLEY, Brett W., STELLE, IV, Raleigh B., KING, Mathew A.
• Granted Patent: US 10,187,112 B2
• Time in Patent Office: Days
• 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 comprising removing some orthogonal frequency division multiplex (OFDM) subcarriers to create an exclusion band, inserting one or more test carriers in the exclusion band, the test carriers being inserted at appropriate power levels relative to the remaining subcarriers.

2. The method of claim 1 wherein the inserted test carriers are placed in locations where there are no off-air signals to reduce the possibility of other signals interfering with detection of egress of the inserted test carriers.

3. A method for detecting leakage of a signal from a Data-Over-Cable Service Interface Specification (DOCSIS) 3.1 channel comprising tuning a receiver to the continuous pilot carriers present in the DOCSIS 3.1 system, and detecting the continuous pilot carriers.

4. A method for detecting leakage of a signal from a Data-Over-Cable Service Interface Specification (DOCSIS) 3.1 channel comprising detecting the presence of the sidebands or power signatures generated by the modulation in the DOCSIS 3.1 system by determining if, within a frequency/spectral view of the signal bandwidth, a predetermined pattern exists.

5. The method of claim 4 further comprising checking for amplitude matching between spectral components.

6-7. -7. (canceled)