HDBaseT — HDMI over Category Cable

HDBaseT

For full HDBaseT technical coverage, see video/hdbaset. For HDBaseT in matrix switchers, see video/video-switching-and-routing. For Extron DTP and XTP, see control-systems/extron-xtp-dtp-navpro.

HDBaseT is a standard developed by the HDBaseT Alliance that transmits HDMI video/audio, RS-232 control, IR (infrared), Ethernet (100 Mbps), and PoE (Power over Ethernet) over a single Cat5e/Cat6/Cat6A cable. It is the most widely deployed standard for extending HDMI signals in installed AV — replacing the need for HDMI repeaters, separate control cables, and power runs to remote devices. Matrix switchers (Extron XTP, Crestron DM, AMX Enova) use HDBaseT as their primary output extension technology.

HDBaseT Specifications by Version

"100 m" is the specification limit on compliant cable. Real-world performance depends on cable grade, installation quality, and whether 4K or 1080p is transmitted.

The 5Play Feature Set

HDBaseT 2.0 "5Play" refers to the five signal types carried simultaneously over the single Cat cable:

1. 5Gig — up to 10.2 Gbps uncompressed video (full HDMI 1.4 bandwidth)
2. Power — PoE to power the remote receiver (typically 13W, enough for the HDBaseT receiver and a small display controller)
3. Video — uncompressed HDMI passthrough including HDCP 2.2
4. Audio — embedded in HDMI, including eARC path
5. Control — bidirectional RS-232 (up to 115200 baud) and IR (38–56 kHz carrier)
6. Ethernet — 100 Mbps for IP control of the remote device or pass-through to a network port at the display

Cable Requirements

Always use solid-core cable for in-wall and in-conduit HDBaseT runs. Stranded patch cable is for equipment connections only. Shielded Cat6A (STP) provides better noise immunity and is required for full 4K bandwidth at 100 m.

EDID and HDCP in HDBaseT Systems

HDBaseT transmitters store the downstream display's EDID locally and respond to source DDC reads directly, rather than passing DDC across the Cat cable (which would fail at distance). The transmitter must be configured with the correct EDID (either learned from the display on initial connection, or set to a fixed EDID). This is a source of "no signal" calls when the display is replaced — the transmitter may present the old display's EDID to the new source.

HDCP authentication passes through HDBaseT. The transmitter authenticates with the source (as a sink) and the receiver authenticates with the display (as a source), forming a repeater chain. All HDCP 2.2-compliant HDBaseT equipment is required to support the full repeater protocol.

Common Pitfalls

• Using stranded patch cable for in-wall HDBaseT runs. Stranded cable has much higher attenuation per meter than solid-core; a 30 m run in stranded cable may fail at 4K where the same distance in solid Cat6A works reliably. Fix: specify solid-core Cat6A for all in-wall and in-ceiling HDBaseT runs; use stranded patch cable only for the last 1–2 m at each end.

• Mixing HDBaseT 1.0 and 2.0 equipment. A HDBaseT 2.0 transmitter and a 1.0 receiver may not negotiate 4K correctly; the receiver falls back to 1080p or produces no signal. Fix: verify all HDBaseT equipment (transmitter, output card, receiver) is the same specification generation; do not mix 1.0 and 2.0 in a 4K system.

• EDID mismatch after display replacement. The HDBaseT transmitter stored the old display's EDID; the new display has different native resolution. The source outputs the old resolution, which may not match the new display. Fix: after replacing a display, re-learn the EDID from the new display in the transmitter's configuration, or set a fixed EDID in the matrix switcher input.

• Exceeding the 100 m distance without distance extenders. Any connection point, wall plate, or patch panel in the cable path adds effective length. A 90 m cable run with two patch panel connections may behave as 95–100 m — at the reliability limit. Fix: measure the actual cable run including all connections; use HDBaseT Active Extension accessories or reduce run length by repositioning equipment.