{
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    "abstract": "This document describes a historical method for encapsulating Synchronous Optical Network/Synchronous Digital Hierarchy (SONET/SDH) Path signals for transport across packet-switched networks (PSNs). The PSNs explicitly supported by this document include MPLS and IP. Note that RFC 4842 describes the standards-track protocol for this functionality, and new implementations must use RFC 4842 rather than this document except when interoperability with older implementations is desired. This memo defines a Historic Document for the Internet community.",
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    "authors": [
      {
        "name": "Andrew G. Malis"
      },
      {
        "name": "Jeremy Brayley"
      },
      {
        "name": "John Shirron"
      },
      {
        "name": "Luca Martini"
      },
      {
        "name": "Stephen Vogelsang"
      }
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      "confidence": "high",
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    "docNumber": "5143",
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      "confidence": "high",
      "note": "Parsed from RFC info page report metadata",
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      "source": "parsed",
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      "updated": "2026-10-16T18:53:46.084Z",
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    "docTitle": "Synchronous Optical Network/Synchronous Digital Hierarchy (SONET/SDH) Circuit Emulation Service over MPLS (CEM) Encapsulation",
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      "confidence": "high",
      "note": "Parsed from RFC index XML title",
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    "docType": "Specification",
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      "confidence": "high",
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    },
    "doi": "10.17487/RFC5143",
    "doi$meta": {
      "confidence": "high",
      "note": "Parsed from RFC index XML doi",
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      "source": "resolved",
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      "updated": "2026-10-16T18:53:46.084Z",
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    "href": "https://doi.org/10.17487/RFC5143",
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      "confidence": "high",
      "note": "Derived from DOI (https://doi.org/<doi>)",
      "originalValue": null,
      "source": "resolved",
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      "updated": "2026-10-16T18:53:46.084Z",
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    "keywords": [
      "PSN",
      "Packet Switched Network"
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    "keywords$meta": {
      "confidence": "high",
      "note": "Parsed from RFC index XML keywords",
      "originalValue": [
        "PSN",
        "Packet Switched Network",
        "RFC4842"
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      "overridden": true,
      "source": "parsed",
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      "updated": "2026-10-16T19:28:02.416Z",
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    "pages": "24",
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      "confidence": "high",
      "note": "Parsed from RFC index XML page-count",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc5143/",
      "updated": "2026-10-16T18:53:46.084Z",
      "version": "extractDocs.js@commit:a6ae1efef02e"
    },
    "publicationDate": "2008-02-01",
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      "confidence": "high",
      "note": "Parsed from RFC index XML date",
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      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc5143/",
      "updated": "2026-10-16T18:53:46.084Z",
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      "confidence": "high",
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      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc5143/",
      "updated": "2026-10-16T18:53:46.084Z",
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        "RFC3985"
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        "confidence": "medium",
        "flag": "MIXED_REF_LAYOUT_RISK anchored=11 proseBlocks=15 skippedAnchorBlocks=13",
        "note": "Parsed from RFC HTML references/informative sections",
        "originalValue": [],
        "reviewRequired": true,
        "source": "parsed",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc5143/",
        "updated": "2026-10-16T18:53:46.084Z",
        "version": "extractDocs.js@commit:a6ae1efef02e"
      },
      "normative": [
        "T-REC-G.707.1996",
        "T-REC-I.363.1996",
        "RFC2119",
        "RFC4023",
        "RFC4447",
        "RFC4842",
        "RFC4928",
        "ANSI.T1.105.1995",
        "orphan/RFC5143/h:f13bf39e",
        "orphan/RFC5143/h:dfb3f198"
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      "normative$meta": {
        "confidence": "high",
        "note": "Parsed from RFC HTML normative references sections",
        "originalValue": [],
        "source": "parsed",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc5143/",
        "updated": "2026-10-16T18:53:46.084Z",
        "version": "extractDocs.js@commit:a6ae1efef02e"
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    "resolvedHref": "https://www.rfc-editor.org/info/rfc5143/",
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      "confidence": "high",
      "note": "Final URL resolved via URL redirect verification",
      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc5143/",
      "updated": "2026-10-16T18:53:46.084Z",
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        "confidence": "high",
        "note": "Derived from supersession relationship fields",
        "originalValue": null,
        "source": "resolved",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc5143/",
        "updated": "2026-10-16T18:53:46.084Z",
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      "errataExist": false,
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        "confidence": "high",
        "note": "Derived from presence of errata links on RFC/Datatracker pages",
        "originalValue": null,
        "source": "parsed",
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        "updated": "2026-10-16T18:53:46.084Z",
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      "latestVersion": false,
      "latestVersion$meta": {
        "confidence": "high",
        "note": "Derived from supersession relationship fields",
        "originalValue": null,
        "source": "resolved",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc5143/",
        "updated": "2026-10-16T18:53:46.084Z",
        "version": "extractDocs.js@commit:a6ae1efef02e"
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      "statusNote": "Historic",
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        "confidence": "high",
        "note": "Mapped from Datatracker doc.json std_level",
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        "source": "parsed",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc5143/",
        "updated": "2026-10-16T18:53:46.084Z",
        "version": "extractDocs.js@commit:a6ae1efef02e"
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      "superseded": true,
      "superseded$meta": {
        "confidence": "high",
        "note": "Derived from supersession relationship fields",
        "originalValue": null,
        "source": "resolved",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc5143/",
        "updated": "2026-10-16T18:53:46.084Z",
        "version": "extractDocs.js@commit:a6ae1efef02e"
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        "confidence": "high",
        "note": "Parsed from RFC index XML",
        "originalValue": [],
        "source": "resolved",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc5143/",
        "updated": "2026-10-16T18:53:46.084Z",
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