Signal cabling
Passive, active, and directional HDMI: planning the cable run
Before running HDMI, identify the source, receiver, and complete cable assembly. Ends that look alike may have different roles. Confirming direction before the pull can avoid removing a cable that is already in place.
Compare construction, direction, and features
Canare identifies its H-A active HDMI cables as directional; Kramer describes CLS-AOCH/60 as a hybrid of fiber and conductors. These illustrate different constructions, without claiming availability. “Optical” does not establish complete electrical isolation.
| Option | Identify | Confirm before choosing |
|---|---|---|
| Passive | Part number, length, and official cable name | Required link format and features |
| Active copper | Part number and end labels | Direction, power, and compatibility with both devices |
| Active optical, AOC | Part number, assembly type, and ends | Direction, power, features, and mechanical requirements |
Mark SOURCE and DISPLAY before deployment
HDMI Licensing Administrator explains that active cables have dedicated source and receiver ends. Check the cable labels and manual. Video direction alone does not establish the return or control features supported by that model.
- Record the source device and destination input; include intermediate matrices and adapters.
- Identify any documented auxiliary power requirement. A plug that fits does not establish a suitable power supply.
- Check the features needed: picture format, audio, and, where applicable, ARC/eARC, CEC, or protected content. Do not infer them from a marketed HDMI version number.
Prepare the path without straining connectors
If optical ends are accessible, never look into ports or fibers. Handle damage or uncertain connectors as the manufacturer directs; visual appearance cannot validate an optical emitter.
- Measure the approved route, including rises, drops, and service slack. Check that connector heads and accessories fit through the available space.
- Read bend and pulling limits for the exact assembly, including its ends. Do not detach heads or use a pulling capsule unless the model allows it and provides instructions.
- Before a difficult pull, arrange a check with the planned devices, cable, and features. Record direction and result.
- Protect crossings, provide strain relief, and check again after the pull. Do not suspend cable weight from an HDMI port.
Finalize the choice against the actual route
Compare a direct cable with an extension system when the path, features, or length cannot be supported by the documentation. That alternative needs its own equipment and cable review; a coupler does not turn any assembly into a valid extension.
- Save part number and length, source and destination, direction, and accessories.
- Record the test format and features actually checked.
- Prepare an equivalent spare and a practical replacement access route.
Setup questions
Can I reverse an active HDMI cable if there is no picture?
First check the source and receiver markings. Do not force connectors or repull the cable by trial and error. If direction is correct, review power and endpoint documentation.
Are all active HDMI cables powered the same way?
No. HDMI Cable Power requires a cable and source supporting that feature. Other assemblies have their own requirements; confirm the manufacturer’s power method and accessory.
Is a bench check enough?
It provides an initial reference. Check again after installation using the intended devices, format, and features, including adapters and patch points. Keep both results.
Sources and documentation
- HDMI Licensing Administrator — HDMI Cable Power · Official documentation
- HDMI Licensing Administrator — HDMI Cable Overview · Official documentation
- Canare — Active HDMI — H-A series · Official documentation
- Kramer — CLS-AOCH/60 Specifications · Official documentation
- Kramer — CLS-AOCH/60-XX / CP-AOCH/60-XX — Installation Instructions · Official documentation