EDID — Extended Display Identification Data
EDID is the data structure a display presents to a source to advertise its supported resolutions, refresh rates, and audio formats — the root cause of most HDMI "no signal" and wrong-resolution failures.
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HDBaseT — HDMI over Category Cable
HDBaseT transmits 4K HDMI, RS-232, IR, Ethernet, and PoE over a single Cat6A cable up to 100 m — the dominant long-distance HDMI extension standard in installed AV.
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HDCP — High-bandwidth Digital Content Protection
HDCP is the content protection handshake required on every HDMI link carrying protected content — a single non-compliant device in the chain blocks the signal entirely.
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