HDMI Over Cat5: A Pair of Devices, Not a Cable
Quick answer / TL;DR: Short answer: use a balun pair for 1080p runs up to about 30 m over Cat5e or Cat6, and HDBaseT for 4K and longer runs with power and control over the same cable. Cat6 is preferable to Cat5e for 4K. Both ends need power, and the pair must be from the same product family.
Three technologies, three distance bands: the cable changes before the picture does.HDMI cannot be carried on Cat5 by wiring an adapter. It requires a transmitter and receiver pair that convert the signal to run over twisted pair.
The distance and capability depend on which conversion technology the pair uses.
Two Technologies
| Technology | Typical reach | 4K support |
|---|
| Balun pair | Up to about 30 m | Limited |
| HDBaseT | Up to 100 m | Yes, with rated units |
| Passive adapter | Not possible | No |
The passive row is the common misconception: there is no passive HDMI-to-Cat5 adapter that works, because the signals are not compatible.
Installation Points
- Use one cable, no splices
- Cat6 preferred for 4K
- Power both ends
- Keep away from mains
- Test with the real source
Splices in the twisted-pair run are the most common cause of intermittent dropouts in these installations.
Real-World Applications
A meeting room with the display 20 m from the table uses a balun pair at 1080p. A 4K display at 40 m needs HDBaseT, because baluns will not carry the bandwidth.
Standards and Verification
| Reference | Relevance |
|---|
| HDMI 2.0 | 18 Gbps source |
| TIA-568.2-D | Twisted-pair cabling |
| HDCP 2.2 | Protected content |
Reach for a specific product pair is not provided in the knowledge base. Test at the target resolution.
References
- HDMI 2.0 specification, 18 Gbps transport
- TIA-568.2-D, Balanced Twisted-Pair Cabling
- HDCP 2.2 specification
Practical Notes
Label both ends of the Cat cable with the same identifier. Swapping transmitter and receiver is the classic installation error.
Related reading: hdmi cable — blogs/news/hdmi-cable
Related reading: hdmi over ethernet — blogs/news/hdmi-over-ethernet
Related reading: hdmi 2 2 cable — blogs/news/hdmi-2-2-cable
Frequently Asked Questions
Can I use a passive adapter?
No. HDMI needs an active pair.
How far at 1080p?
About 30 m with baluns.
Does Cat5e work for 4K?
Rarely. Use Cat6 or HDBaseT.
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