FIELD GUIDESource-led reference
Port & Cable

P037 / Video / Standard

HDMI 2.1 overview

HDMI 2.1 defines capabilities reaching 48 Gbit/s aggregate signaling.

Also called HDMI 2.1 HDMI48 FRL

The label does not guarantee every optional feature.

The useful distinction

Read the port’s feature list and supported display timings. Treat cable category, adapter capabilities and endpoint support as distinct evidence requirements.

Claim inspection dates: 2026-10-01 · Independent review pending

Standard note · not an individual product specification

CAPABILITY NOTES / SOURCE REVIEW 11 OCTOBER 2026

Read the capability, not just the name.

Published scope, conditions and what remains unknown. Figures are not measured end-to-end performance.
Name or markSupported reading and conditionsDo not inferAuthority
Ultra High Speed HDMI cableUp to 48Gbps cable classVerify cable model/length, source, intermediary and display mode.The cable class does not certify the whole setup.S516 · HDMI Licensing AdministratorChecked 2026-10-11

Ultra High Speed HDMI cable

Published scope
Up to 48Gbps cable class
Conditions
Verify cable model/length, source, intermediary and display mode.
Do not infer
The cable class does not certify the whole setup.
Authority
S516 · HDMI Licensing Administrator
Checked 2026-10-11

These are source-qualified distinctions. No complete device pairing, physical fit or operating result is certified here.

Inspect the canonical evidence and scope

C073B

HDMI LA identifies Ultra High Speed HDMI cables for system configurations up to 48Gbps and requires cable certification labels.

Cable-class evidence, not proof of a source or display’s selected video timing.

S516 · HDMI Licensing Administrator

The useful distinction

Understand the requirement.

HDMI 2.1 defines capabilities reaching 48 Gbit/s aggregate signaling. [C037A]

An HDMI 2.1-labeled implementation may retain TMDS rather than implementing the maximum FRL rate. [C037B]

Bounded facts, visible unknowns

Specifications and limits

HDMI 2.1 overview facts and limitations
Specification ceiling48 Gbit/s aggregate signaling [C037A] [C037B]
Implemented featuresMust be verified per device [C037A] [C037B]
Verified device listNot included. Check exact device and accessory documentation.
A boundary, not an omission to guess around.

This is a scoped requirements guide, not an interoperability certification. It does not test hardware, calculate an arbitrary display timing, or replace the exact product documentation. A missing capability stays unknown.

Before you connect

What to check

  1. Check resolution, refresh rate, color depth and chroma settings together.
  2. Confirm any needed VRR, HDR or other optional features explicitly.
  3. Check the cable and each adapter for the same task.
Trace a supported connection class →

Your next step

Move from the form to the requirement.

Compare this field note See the differences without assuming interchangeability.Work through a connection Choose your task before deciding on a cable.Explore this evidence trail Inspect the claims and their dependencies. (private workspace)

The source trail

Evidence for this page

AI-assisted inspection is not independent engineering review. Source scope and access limitations are disclosed below. Procedural checklists are editorial requirements, not hardware measurements.

C037ASource checked · pending review

HDMI 2.1 defines capabilities reaching 48 Gbit/s aggregate signaling.

HDMI Licensing Administrator · HDMI 2.1 announcement ↗

Locator: HDMI 2.1 bandwidth and cable announcement
Access: public page.

S010: full source recordInspect review dependencies → (private workspace)

Claim scope: Consumer identification / documented standard or product class only. Next review due 2026-12-30.

C037BSource checked · pending review

An HDMI 2.1-labeled implementation may retain TMDS rather than implementing the maximum FRL rate.

HDMI Licensing Administrator · HDMI 2.1 feature implementation FAQ ↗

Locator: FAQ about HDMI 2.1 supporting TMDS without FRL
Access: public page.

S012: full source recordInspect review dependencies → (private workspace)

Claim scope: Narrowly stated supporting distinction; not an end-to-end device guarantee. Next review due 2026-12-30.

Suggest a correction to this field note →

Common questions

Questions this record can help resolve

Does the HDMI connector or cable shape tell me the HDMI version?Separate HDMI Type-A/Mini/Micro physical form from HDMI specification-version and exact cable/device capability.

Read the whole power profile

One label. Several different limits.

Keep fixed outputs, PPS bands, region and cable evidence separate.

Explore output profiles →

Evidence behind this page

Scope first. Source second. Approval separate.

2 linked sources · 2 scoped claims · 0 sources with inspection/access flags.

Page scope: consumer_pilot

Assessment 2026-10-22 · earliest scheduled source review 2026-12-30. This is a recorded-date assessment, not a live source check. Page-level independent review is not established by this panel.

Inspect 2 source scopes, access limits and dates

S010 · HDMI 2.1 announcement

HDMI Licensing Administrator · Standards-organization domain · inspected 2026-10-01 · due 2026-12-30

Within inspection window

Scoped support: 48 Gbit/s aggregate signaling ceiling, conditional on implementation.

Not established / limitations:

Locator: HDMI 2.1 bandwidth and cable announcement

S012 · HDMI 2.1 feature implementation FAQ

HDMI Licensing Administrator · Standards-organization domain · inspected 2026-10-01 · due 2026-12-30

Within inspection window

Scoped support: A version number alone does not identify implemented features.

Not established / limitations:

Locator: FAQ about HDMI 2.1 supporting TMDS without FRL

Trace 2 claims to their source records

C037A · P037

HDMI 2.1 defines capabilities reaching 48 Gbit/s aggregate signaling.

Claim scope: Consumer identification / documented standard or product class only

Source links: S010 · Evidence trail → (private workspace)

C037B · P037

An HDMI 2.1-labeled implementation may retain TMDS rather than implementing the maximum FRL rate.

Claim scope: Narrowly stated supporting distinction; not an end-to-end device guarantee

Source links: S012 · Evidence trail → (private workspace)

Prepare this page for review → (private workspace)Read the evidence method →

Recorded evidence only. An inspection date, publisher label, source link or generated packet is not independent technical review, hardware testing, fabrication approval or a compatibility verdict.