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Pattern DD-G

Presentation surface across a domain boundary

The display is a shared, writable node between every domain connected to it.

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Area
Data diodes
Environments
1
Products used
1

How it is built

The picture gets through. DDC, CEC, ARC and HEC do not.DomainShared roomClientHDMI diodePresentation surfacepicture andsoundEDID, DDC, CEC,ARC, HEC broken
The picture gets through. DDC, CEC, ARC and HEC do not.DomainShared roomClientHDMI diodePresentation surfacepicture and soundEDID, DDC, CEC,ARC, HEC broken
  • One-way path
  • Data path
  • Path that does not exist
The picture gets through. DDC, CEC, ARC and HEC do not.

Used in these environments

  1. Presentation across a domain boundaryThe shared display is the only common component — and therefore the only channel connecting the domains.

How it works

A client in a protected domain drives a display in a shared room through an HDMI diode. Picture and sound pass. DDC, CEC, ARC and HEC do not.

Why the cable needs a diode at all

HDMI is not one-way. DDC is a two-way I²C bus carrying EDID and HDCP key exchange; CEC is an addressed control bus; ARC carries audio backwards. A shared display is therefore a shared, writable node between every domain that has ever been connected to it.

The limit worth stating

The diode governs the video path. It does not govern a touch panel’s USB cable, the room’s acoustics, or a camera. Those are separate decisions and they have to be made separately.

In the catalogue

Equipment from the catalogue

TEMPEST Level B · RÖS U2

HDMI Diode

The Fibersystem HDMI Diode protects sensitive systems by ensuring that video and audio can only travel in one…

Product no 60-00-9155

Hands soldering a circuit board under a work lamp

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