ANSI/TIA-568.2-E
Updated 2026-10-25
Data records
- Clause 4.1 of ANSI/TIA-568.2-E includes a matrix describing the backward compatibility of mated components across categories, and a note to it directs that the Category 8 transverse conversion loss requirements be applied when backward compatibility is tested for that parameter.
- Under clause 4.1 of ANSI/TIA-568.2-E, cabling that combines components of different categories has to satisfy whatever the weakest category among them demands.
- ANSI/TIA-568.2-E does not recognize Category 5 or the other early numbered categories apart from Category 3. Category 5 is treated as superseded by Category 5e, and its transmission parameters are kept for legacy reference in informative Annex P.
- Clause 4.2 of ANSI/TIA-568.2-E recognizes five categories of balanced twisted-pair cabling, from Category 3 at the low end to Category 8 at the high end, and assigns each category its own specified frequency range.
- The Category 8 channel of ANSI/TIA-568.2-E has no more than two connectors, joined by horizontal cable and two equipment cords, and the total cord length allowed depends on the insertion loss de-rating of the cord cable.
- For every category below Category 8, the channel model of ANSI/TIA-568.2-E consists of fixed horizontal cabling, an optional consolidation point cable, and work area, patch and equipment cords, and its limits assume four connections: the outlet, an optional consolidation point and a two-connector cross-connect.
- ANSI/TIA-568.2-E defines the Category 8 direct attach channel as a shortened channel with a plug at each end and no connecting hardware between them, and gives it its own set of requirements in clause 6.5.
- In ANSI/TIA-568.2-E the lengths in the channel and permanent link models are the basis from which the transmission limits were derived; no clause sets a field pass or fail limit on length, and propagation delay serves as the graded measure of electrical length.
- Annex F of ANSI/TIA-568.2-E covers the modular plug terminated link, a link ending in a plug that serves fixed devices such as cameras and wireless access points, and requires it to meet the permanent link requirements.
- For every category below Category 8, the permanent link of ANSI/TIA-568.2-E is the fixed cabling with up to three connections (outlet, optional consolidation point and cross-connect), and it excludes the test cords used to measure it.
- ANSI/TIA-568.2-E defines attenuation to crosstalk ratio, far end (ACRF, formerly called ELFEXT) as the far-end crosstalk loss between two pairs less the insertion loss of the disturbed pair.
- ANSI/TIA-568.2-E defines equal level transverse conversion transfer loss as the transverse conversion transfer loss of a pair less that pair's differential insertion loss, taken between opposite ends of the same pair.
- Alien crosstalk requirements in ANSI/TIA-568.2-E, expressed as PSANEXT and PSAACRF with their averaged forms, apply only to augmented Category 6 and Category 8; pair-to-pair alien NEXT and FEXT are not specified, and the measurement procedures given are laboratory procedures.
- Clause 6.1 of ANSI/TIA-568.2-E applies every transmission requirement at both ends or in both directions, and permits laboratory measurement by either the balun method of Annex C or the balunless method of Annex D.
- For Category 3, ANSI/TIA-568.2-E leaves return loss, PSNEXT loss, ACRF, PSACRF and dc resistance unbalance within a pair unspecified, while insertion loss, NEXT loss, propagation delay and delay skew remain specified.
- ANSI/TIA-568.2-E specifies equal level transverse conversion transfer loss for channels, taken between opposite ends of the same pair, while for permanent links the requirement applies at Category 8 only.
- ANSI/TIA-568.2-E sets no direct requirement on FEXT or PSFEXT for channels and permanent links; far-end crosstalk is graded only through ACRF and PSACRF.
- In ANSI/TIA-568.2-E a channel or permanent link result is judged against the limit equations at every specified frequency; the accompanying tables of values at selected frequencies are provided for information only.
- Annex H of ANSI/TIA-568.2-E places any mid-span power source outside the permanent link and requires mid-span power sources to be switched off, and end-point power sources disconnected, during field testing.
- ANSI/TIA-568.2-E specifies dc resistance unbalance within a pair for every category except Category 3. Between pairs it applies to channels of Category 5e and above, while for permanent links the between-pair requirement applies to Category 8 only.
- ANSI/TIA-568.2-E specifies channel and permanent link requirements for return loss, insertion loss, NEXT loss, PSNEXT loss, ACRF, PSACRF, propagation delay, delay skew, dc loop resistance and dc resistance unbalance, with some parameters left unspecified for the lower categories.
- In ANSI/TIA-568.2-E, channel transverse conversion loss is a requirement for augmented Category 6 and Category 8. At Category 6 it is given for information only and the lower categories carry no requirement, while for permanent links it applies to Category 8 only.
- ANSI/TIA-568.2-E contains no limit clause for wire map, naming it as a field parameter only in the power delivery annex, and it defines the T568A pin and pair assignment as primary with T568B as an option.
- ANSI/TIA-568.2-E cites ANSI/TIA-1152 without a date, so the latest edition applies, as its only reference for field test instruments; requirements on tester accuracy are left to that companion document rather than stated in the cabling standard itself.
- Over part of the frequency band, the NEXT and PSNEXT limits that ANSI/TIA-568.2-E sets for a Category 8 permanent link are less stringent than the augmented Category 6 permanent link limits. A result graded against the Category 8 limit therefore does not by itself show that the augmented Category 6 limit is met.
- ANSI/TIA-568.2-E states that, for field testing, checking propagation delay and delay skew at a single specified frequency is sufficient; no such shortcut sentence accompanies the Category 8 channel skew requirement.
- ANSI/TIA-568.2-E treats ACRF and PSACRF results as information only where the underlying far-end crosstalk is very high, with the threshold depending on the parameter, the category and whether a channel or permanent link is measured.
- For field measurement, ANSI/TIA-568.2-E raises to a fixed floor any insertion loss limit, for a channel or a permanent link, whose computed value would fall beneath it, applies the same rule to the Category 8 direct attach channel, and refers the reader to ANSI/TIA-1152.
- ANSI/TIA-568.2-E notes that its permanent link PSNEXT limits are stricter than the channel limits so that a passing link can be extended with cords into a channel that still meets the channel requirements.
- Where the NEXT or PSNEXT limit equations of ANSI/TIA-568.2-E compute above a category-dependent ceiling, the limit reverts to that ceiling; no such ceiling is stated for Category 8 permanent link NEXT.
- ANSI/TIA-568.2-E contains no provision that excuses a return loss or NEXT result because the measured insertion loss is low. The return loss provision of that kind appears in ANSI/TIA-1152-A, and neither ANSI/TIA-568.2-E nor ANSI/TIA-1152-A carries one for NEXT.
- ANSI/TIA-568.2-E treats the between-pairs dc resistance unbalance requirement as met in field testing whenever the resistance difference between pairs stays under a fixed value, as an alternative to the percentage criterion.
- Informative Annex J of ANSI/TIA-568.2-E describes how insertion loss rises with installed temperature and how the horizontal length may be reduced to compensate, separately for unscreened and screened cable.
- After scope, references and definitions, ANSI/TIA-568.2-E has a general clause on categories and backward compatibility, a clause of mechanical requirements, and a transmission clause that runs from parameter definitions and test configurations through channel, permanent link and Category 8 direct attach requirements to cable, connecting hardware and cord requirements.
- Annexes I through Q of ANSI/TIA-568.2-E are informative and cover test fixtures, installations at elevated temperature, the derivation of the delay and return loss limits, modeling and length scaling, background to the NEXT limits, alien crosstalk normalization, legacy Category 5 parameters and a bibliography.
- Annexes A through H of ANSI/TIA-568.2-E are normative and cover connecting hardware reliability, general measurement requirements, balun and balunless test procedures, transfer impedance, the modular plug terminated link, cords built with the smallest conductor size the standard permits, and power delivery.
- Clause 2 of ANSI/TIA-568.2-E lists normative references that include ANSI/TIA-568.0, ANSI/TIA-568.3, ANSI/TIA-569 and ANSI/TIA-606, the ICEA and NEMA cable design documents, the ASTM cable test methods, and the IEC modular connector and coupling attenuation series.
Elsewhere in the family
- Balanced Twisted-Pair Telecommunications Cabling and Components Standard more on this entry on Testing Reference
Sources
- ANSI/TIA-568.2-E, Balanced Twisted-Pair Telecommunications Cabling and Components Standard, 2024 edition, TIA. Cited: clause 4.1; clause 4.2; clause 6.2.2; clause 6.2.1, 6.3.9; clause 3.2, 6.5; clause 6.2; clause F.2; clause 6.4; clause 6.1.6; clause 6.1.9; clause 6.3.24; clause 6.1; clause 6.3.8; clause 6.3.18, 6.4.19; clause 6.3.12; clause H.4.3, H.4.4; clause 6.3.3, 6.3.4, 6.4.4, 6.4.5; clause 6.3; clause 6.3.16, 6.4.17; clause 5.7.5, H.4.3.1; clause 2; clause 6.4.11, 6.4.12; clause 6.3.21, 6.3.22, 6.4.21, 6.4.22; clause 6.3.13, 6.3.15, 6.4.14, 6.4.16; clause 6.3.9, 6.4.10, 6.5.2; clause 6.4.12; clause 6.3.10, 6.3.11, 6.4.11, 6.4.12; clause 6.3.8, 6.3.10; clause 6.3.4, 6.4.5; clause J.3; clause Table of contents. Held as: Purchased single-user copy.
Obtaining the documents
- ANSI/TIA-568.2-E (2024): publisher catalog or sales page
Changelog (89 entries)
| Date | Revision | Change |
|---|---|---|
| 2026-10-25 | created (std.tia-568-2-e.categories.backward-compatibility) | |
| 2026-10-25 | revised (std.tia-568-2-e.categories.backward-compatibility) | |
| 2026-10-25 | review_status unreviewed -> software_reviewed (std.tia-568-2-e.categories.backward-compatibility) | |
| 2026-10-25 | created (std.tia-568-2-e.categories.mixed) | |
| 2026-10-25 | review_status unreviewed -> software_reviewed (std.tia-568-2-e.categories.mixed) | |
| 2026-10-25 | created (std.tia-568-2-e.categories.not-recognized) | |
| 2026-10-25 | review_status unreviewed -> software_reviewed (std.tia-568-2-e.categories.not-recognized) | |
| 2026-10-25 | created (std.tia-568-2-e.categories.recognized) | |
| 2026-10-25 | review_status unreviewed -> software_reviewed (std.tia-568-2-e.categories.recognized) | |
| 2026-10-25 | created (std.tia-568-2-e.configuration.category-8-channel) | |
| 2026-10-25 | review_status unreviewed -> software_reviewed (std.tia-568-2-e.configuration.category-8-channel) | |
| 2026-10-25 | created (std.tia-568-2-e.configuration.channel) | |
| 2026-10-25 | revised (std.tia-568-2-e.configuration.channel) | |
| 2026-10-25 | review_status unreviewed -> software_reviewed (std.tia-568-2-e.configuration.channel) | |
| 2026-10-25 | created (std.tia-568-2-e.configuration.direct-attach) | |
| 2026-10-25 | revised (std.tia-568-2-e.configuration.direct-attach) | |
| 2026-10-25 | review_status unreviewed -> software_reviewed (std.tia-568-2-e.configuration.direct-attach) | |
| 2026-10-25 | created (std.tia-568-2-e.configuration.length-model) | |
| 2026-10-25 | review_status unreviewed -> software_reviewed (std.tia-568-2-e.configuration.length-model) | |
| 2026-10-25 | created (std.tia-568-2-e.configuration.mptl) | |
| 2026-10-25 | review_status unreviewed -> software_reviewed (std.tia-568-2-e.configuration.mptl) | |
| 2026-10-25 | created (std.tia-568-2-e.configuration.permanent-link) | |
| 2026-10-25 | review_status unreviewed -> software_reviewed (std.tia-568-2-e.configuration.permanent-link) | |
| 2026-10-25 | created (std.tia-568-2-e.definition.acrf) | |
| 2026-10-25 | review_status unreviewed -> software_reviewed (std.tia-568-2-e.definition.acrf) | |
| 2026-10-25 | created (std.tia-568-2-e.definition.eltctl) | |
| 2026-10-25 | review_status unreviewed -> software_reviewed (std.tia-568-2-e.definition.eltctl) | |
| 2026-10-25 | created (std.tia-568-2-e.field-test.alien-crosstalk) | |
| 2026-10-25 | review_status unreviewed -> software_reviewed (std.tia-568-2-e.field-test.alien-crosstalk) | |
| 2026-10-25 | created (std.tia-568-2-e.field-test.both-ends) | |
| 2026-10-25 | review_status unreviewed -> software_reviewed (std.tia-568-2-e.field-test.both-ends) | |
| 2026-10-25 | created (std.tia-568-2-e.field-test.category-3-exclusions) | |
| 2026-10-25 | review_status unreviewed -> software_reviewed (std.tia-568-2-e.field-test.category-3-exclusions) | |
| 2026-10-25 | created (std.tia-568-2-e.field-test.eltctl) | |
| 2026-10-25 | revised (std.tia-568-2-e.field-test.eltctl) | |
| 2026-10-25 | review_status unreviewed -> software_reviewed (std.tia-568-2-e.field-test.eltctl) | |
| 2026-10-25 | created (std.tia-568-2-e.field-test.fext) | |
| 2026-10-25 | review_status unreviewed -> software_reviewed (std.tia-568-2-e.field-test.fext) | |
| 2026-10-25 | created (std.tia-568-2-e.field-test.limits-are-equations) | |
| 2026-10-25 | review_status unreviewed -> software_reviewed (std.tia-568-2-e.field-test.limits-are-equations) | |
| 2026-10-25 | created (std.tia-568-2-e.field-test.power-equipment) | |
| 2026-10-25 | revised (std.tia-568-2-e.field-test.power-equipment) | |
| 2026-10-25 | review_status unreviewed -> software_reviewed (std.tia-568-2-e.field-test.power-equipment) | |
| 2026-10-25 | created (std.tia-568-2-e.field-test.resistance-unbalance) | |
| 2026-10-25 | revised (std.tia-568-2-e.field-test.resistance-unbalance) | |
| 2026-10-25 | review_status unreviewed -> software_reviewed (std.tia-568-2-e.field-test.resistance-unbalance) | |
| 2026-10-25 | created (std.tia-568-2-e.field-test.specified-parameters) | |
| 2026-10-25 | review_status unreviewed -> software_reviewed (std.tia-568-2-e.field-test.specified-parameters) | |
| 2026-10-25 | created (std.tia-568-2-e.field-test.tcl) | |
| 2026-10-25 | revised (std.tia-568-2-e.field-test.tcl) | |
| 2026-10-25 | review_status unreviewed -> software_reviewed (std.tia-568-2-e.field-test.tcl) | |
| 2026-10-25 | created (std.tia-568-2-e.field-test.wire-map) | |
| 2026-10-25 | revised (std.tia-568-2-e.field-test.wire-map) | |
| 2026-10-25 | review_status unreviewed -> software_reviewed (std.tia-568-2-e.field-test.wire-map) | |
| 2026-10-25 | created (std.tia-568-2-e.pointer.field-tester) | |
| 2026-10-25 | review_status unreviewed -> software_reviewed (std.tia-568-2-e.pointer.field-tester) | |
| 2026-10-25 | created (std.tia-568-2-e.rule.category-8-not-a-superset) | |
| 2026-10-25 | revised (std.tia-568-2-e.rule.category-8-not-a-superset) | |
| 2026-10-25 | review_status unreviewed -> software_reviewed (std.tia-568-2-e.rule.category-8-not-a-superset) | |
| 2026-10-25 | created (std.tia-568-2-e.rule.delay-skew-field-check) | |
| 2026-10-25 | revised (std.tia-568-2-e.rule.delay-skew-field-check) | |
| 2026-10-25 | review_status unreviewed -> software_reviewed (std.tia-568-2-e.rule.delay-skew-field-check) | |
| 2026-10-25 | created (std.tia-568-2-e.rule.information-only-zones) | |
| 2026-10-25 | revised (std.tia-568-2-e.rule.information-only-zones) | |
| 2026-10-25 | review_status unreviewed -> software_reviewed (std.tia-568-2-e.rule.information-only-zones) | |
| 2026-10-25 | created (std.tia-568-2-e.rule.insertion-loss-floor) | |
| 2026-10-25 | revised (std.tia-568-2-e.rule.insertion-loss-floor) | |
| 2026-10-25 | review_status unreviewed -> software_reviewed (std.tia-568-2-e.rule.insertion-loss-floor) | |
| 2026-10-25 | created (std.tia-568-2-e.rule.link-tighter-than-channel) | |
| 2026-10-25 | review_status unreviewed -> software_reviewed (std.tia-568-2-e.rule.link-tighter-than-channel) | |
| 2026-10-25 | created (std.tia-568-2-e.rule.next-ceilings) | |
| 2026-10-25 | revised (std.tia-568-2-e.rule.next-ceilings) | |
| 2026-10-25 | review_status unreviewed -> software_reviewed (std.tia-568-2-e.rule.next-ceilings) | |
| 2026-10-25 | created (std.tia-568-2-e.rule.no-low-loss-escape) | |
| 2026-10-25 | revised (std.tia-568-2-e.rule.no-low-loss-escape) | |
| 2026-10-25 | review_status unreviewed -> software_reviewed (std.tia-568-2-e.rule.no-low-loss-escape) | |
| 2026-10-25 | created (std.tia-568-2-e.rule.unbalance-field-escape) | |
| 2026-10-25 | revised (std.tia-568-2-e.rule.unbalance-field-escape) | |
| 2026-10-25 | review_status unreviewed -> software_reviewed (std.tia-568-2-e.rule.unbalance-field-escape) | |
| 2026-10-25 | created (std.tia-568-2-e.structure.annex-j) | |
| 2026-10-25 | review_status unreviewed -> software_reviewed (std.tia-568-2-e.structure.annex-j) | |
| 2026-10-25 | created (std.tia-568-2-e.structure.clauses) | |
| 2026-10-25 | review_status unreviewed -> software_reviewed (std.tia-568-2-e.structure.clauses) | |
| 2026-10-25 | created (std.tia-568-2-e.structure.informative-annexes) | |
| 2026-10-25 | review_status unreviewed -> software_reviewed (std.tia-568-2-e.structure.informative-annexes) | |
| 2026-10-25 | created (std.tia-568-2-e.structure.normative-annexes) | |
| 2026-10-25 | review_status unreviewed -> software_reviewed (std.tia-568-2-e.structure.normative-annexes) | |
| 2026-10-25 | created (std.tia-568-2-e.structure.normative-references) | |
| 2026-10-25 | review_status unreviewed -> software_reviewed (std.tia-568-2-e.structure.normative-references) |
Cite this page
Cite the governing standard for the fact itself; cite this page as the finding aid.
"ANSI/TIA-568.2-E." Fiber Optic Reference. 2026-10-25. https://www.fiberopticreference.com/standards/tia-568-2-e/.
Fiber Optic Reference, ANSI/TIA-568.2-E (Oct. 25, 2026), https://www.fiberopticreference.com/standards/tia-568-2-e/.
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title = {ANSI/TIA-568.2-E},
howpublished = {\url{https://www.fiberopticreference.com/standards/tia-568-2-e/}},
organization = {Fiber Optic Reference},
publisher = {Fiber Optic Reference},
year = {2026},
note = {last substantive change 2026-10-25}
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