Threat model framing
When devices capture sensor or operational truth at the edge, the priority is often integrity and assurance of egress, not convenience of bidirectional maintenance from untrusted networks.
Where hardware-enforced diodes fit
Pair procedural controls (tamper-evident procedures, physical security) with network segments where reverse paths are physically absent for categories of traffic that must never return commands or exploits.
Documentation
Review the ConnexONE comparison and technical guide:
Data diode vs firewall (PDF)
Guide to Data Diodes (PDF)
Disclaimer: Defence accreditation paths vary by nation and programme—this article is architectural commentary, not a compliance determination.