HDBaseT sends uncompressed AV, plus power and control, over a single twisted-pair (Cat) cable up to 100 m. It’s the standard behind most “HDMI over Cat6” extenders and matrix switchers, and it solves the short-reach problem of copper HDMI without moving to full AV-over-IP.
The “5Play” feature set
HDBaseT bundles five things over one cable:
- Video & audio — uncompressed HD/4K HDMI.
- Ethernet — up to 100 Mbps passthrough (spec-dependent).
- Control — IR, RS-232, and CEC.
- Power — PoH (Power over HDBaseT) can power the remote receiver.
- USB — on HDBaseT 3.0 / USB-capable variants.
Distance and resolution
| Spec | Max distance | 4K support |
|---|---|---|
| HDBaseT 1.0 | 100 m (1080p) | — |
| HDBaseT 2.0 | 100 m @ 1080p / ~70 m @ 4K | 4K30 (often via limits) |
| HDBaseT 3.0 | 100 m | 4K/8K, higher bandwidth |
4K reduces reach on older gear. Many HDBaseT 2.0 extenders run 4K only to ~70 m and full 1080p to 100 m. Check the extender’s rated 4K distance — it’s usually shorter than the 100 m headline. HDBaseT 3.0 restores full-distance 4K and adds 8K.
Cabling requirements
- Use solid-copper Cat6 or Cat6a, not Cat5e, for reliable 4K and full distance. Cat6a improves headroom on long/noisy runs.
- Shielded (STP) is recommended in high-interference environments; ground it properly.
- Dedicated runs. Don’t share an HDBaseT run with other services, and avoid tight bundling with power cables.
- One solid run, minimal patch points. Every coupler and patch panel adds loss — keep the channel as clean as possible.
HDBaseT vs AV-over-IP
- HDBaseT — point-to-point (or matrix), uncompressed, near-zero latency, no network engineering. Best for fixed source-to-display runs and small matrices.
- AV-over-IP — scales to large, flexible any-to-any distribution over standard switches, but needs network design (bandwidth, multicast). See AV-over-IP Network Design.
Practical notes
- PoH direction matters. Confirm which end sources power (transmitter or receiver) — mismatches leave the remote unit dead.
- Link training takes a moment. A brief blank after connect/switch while the link negotiates is normal; persistent dropouts point to cabling.
- EDID and HDCP still apply. HDBaseT carries HDMI faithfully, so EDID and HDCP behave as they would over a direct HDMI link.
Related
Sources
- HDBaseT Alliance — HDBaseT Specification 1.0/2.0/3.0, the 5Play feature set, and distance/resolution specifications.
- HDBaseT Spec 3.0 overview — uncompressed HDMI 2.0 4K/60 4:4:4 (18 Gbps) distribution to 100 m.