{"schema_version":"1.0","canonical_url":"https://patentable.app/patents/US-8509389","patent":{"patent_number":"US-8509389","title":"Systems and methods for loop length estimation based on per-port calibration","assignee":null,"inventors":[],"filing_date":"2008-03-07T00:00:00.000Z","publication_date":"2013-08-13T00:00:00.000Z","cpc_codes":["H04M","H04M"],"num_claims":20,"abstract":"Systems and methods for performing loop length estimation are described. One embodiment includes a method which comprises receiving an echo signal for a loop under test where the echo signal is a per-port calibrated echo response obtained using frequency domain reflectometry single-ended line testing (FDR-SELT). The method further comprises analyzing characteristics of the echo signal to perform a loop length estimation based on data relating to ripple frequency as a function of loop length."},"analysis":{"summary":null,"layman_explanation":null,"technical_analysis":null,"business_analysis":null,"faqs":null,"topics":[],"tech_cluster":null},"seo":{"title":"Systems and methods for loop length estimation based on per-port calibration","description":"Systems and methods for performing loop length estimation are described. One embodiment includes a method which comprises receiving an echo signal for a loop under test where the echo signal is a per-","keywords":[]},"attribution":{"source":"Patentable","source_url":"https://patentable.app","canonical_url":"https://patentable.app/patents/US-8509389","license":"CC-BY-4.0-like","license_terms":"AI-generated analysis on this page (summary, layman_explanation, technical_analysis, business_analysis, faqs) may be reused with attribution and a visible link back to the canonical URL above. Patent abstracts, claims, and bibliographic data are USPTO public domain.","required_link":"https://patentable.app/patents/US-8509389","citation_suggestion":"Patentable. \"Systems and methods for loop length estimation based on per-port calibration\" (US-8509389). https://patentable.app/patents/US-8509389","copyright_holder":"Nomic Interactive Technology LLC"},"links":{"html":"https://patentable.app/patents/US-8509389","json":"https://patentable.app/api/llm-context/US-8509389","site":"https://patentable.app","llms_txt":"https://patentable.app/llms.txt"},"generated_at":"2026-05-30T20:59:20.924Z"}