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Research dossier · General Reference

G.992.3 Annex J

part of the ITU-T recommendation G.992.3

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General referenceInterpretive dossier study · Crown Archives visual atlas
Record originEnglish Wikipedia
Text licenseCC BY-SA 4.0
Source revisionOct 3, 2024
Entity authorityQ5511978 ↗
Source-derived summary

Annex J is a specification in ITU-T Recommendations G.992.3 and G.992.5 for all digital mode ADSL with improved spectral compatibility with ADSL over ISDN, which means that it is a type of naked DSL which will not disturb existing Annex B ADSL services in the same cable binder.

This specification has the same upstream/downstream frequency split of 276 kHz as Annex B, but does not have lower frequency limit of 138 kHz, allowing upstream bandwidth to be increased from 1.8 Mbit/s to 3.5 Mbit/s. This is similar to Annex M, but Annex J can not have POTS on the same line.

Deutsche Telekom started deploying Annex J in 2011, Vodafone Germany followed suit in April 2015 (marketed as quality improvements).

Editorial summary

Begin with the source’s own compact description: “G.992.3 Annex J” is part of the ITU-T recommendation G.992.3. The dossier treats that line as a proposition to test through Annex, part and ITU-T, not as a finished interpretation.

Editorial reviewA concise reference frame for defining the subject, testing terminology and identifying the institution closest to the evidence. The current lead gives the account dated anchors—2011, 2015—that can be checked directly. The selected authority fields contribute no independent date. For this dossier, Annex, part and ITU-T is the immediate research focus.
Editorial analysis

Why this record matters

The phrase “part of the ITU-T recommendation G.992.3” supplies a clear boundary for inquiry. It also exposes the unanswered questions: who defined that boundary, when it became stable and which sources sit outside it.

Evidence profile

Named sources, stable identifiers and responsible institutions provide the strongest route from overview to verifiable evidence. The source revision retrieved here is dated Oct 3, 2024. The linked authority identifier is Q5511978. None of the 0 selected statements returned an explicit reference. The first chronological checks are 2011 and 2015.

Critical limits

The absence of detail may reflect summary conventions rather than a lack of surviving documentation. The lead is largely declarative, so disagreement and counter-evidence require a deliberate search beyond the opening account. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.

How to read it

Use the entry as an orientation point, then follow its citations and revision history. Names, dates and institutional relationships should be checked against the original record.

Best used for
  • Subject orientation
  • Search vocabulary
  • Locating named sources
Verify next

The closest primary source, responsible institution and strongest cited specialist reference.

Three-step research path

  1. Establish the record: confirm the title “G.992.3 Annex J”, its source revision and the description used here.
  2. Expand the search: follow G.992.3 Annex J primary sources, G.992.3 Annex J archive and Annex research across catalogues and specialist indexes.
  3. Test the account: compare the strongest cited source with the responsible institution’s current record and note any disagreement.

Questions for further research

  1. Which source most directly establishes the central claim about “G.992.3 Annex J”?
  2. Which institution is responsible for the underlying evidence?
  3. Which cited source is closest to the event, object or claim?
Subject index

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Source & attribution

This entry incorporates text from “G.992.3 Annex J” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.