Pattern FO-F

Link between security domains with a signature requirement

The diode removes the logical return path, the fiber removes the electrical one — the two reinforce each other.

Area
Fiber & OT
Environments
1
Products used
6

How it is built

The diode removes the logical return path, the fiber the electrical one. The two reinforce each other.High domainLow domainSystemData diodeReceptionfiber: noelectricalsignatureno logical returnpath
The diode removes the logical return path, the fiber the electrical one. The two reinforce each other.High domainLow domainSystemData diodeReceptionfiber: no electricalsignatureno logicalreturn path
  • One-way path
  • Data path
  • Path that does not exist
The diode removes the logical return path, the fiber the electrical one. The two reinforce each other.

How it works

A diode removes the logical return path. Fiber removes the electrical one. The two properties reinforce each other, and this is the only environment where the absence of an electrical signature is the main argument rather than a side effect.

Why both are needed

A diode over copper still has a conductor crossing the boundary, and a conductor carries emissions whether or not it carries data. Fiber alone still allows a bidirectional protocol. Neither property substitutes for the other.

What still crosses

The mains supply. It crosses as copper in every installation, and it is the path a filter exists to handle.

In the catalogue

Equipment from the catalogue

Standard

Card Module FO USB 2.0 Transceiver LC

Intended for use with Fibersystem’s Rack Module FO USB 2.0 Receiver, 60-00-7356 with M-number F3785-000085 to…

Product no 60-00-7357 (42-108)

Standard

Ethernet Fiber Optical Dual Converter 1 Gbit

Secure rack-mounted module featuring two fully independent channels, specifically designed to prevent…

Product no 60-00-7425

Standard

Card Module FO USB 2.0 Receiver LC

Intended for use with Fibersystem’s Rack Module FO USB 2.0 Transceiver, 60-00-7357 with M-number F3785-000091…

Product no 60-00-7356 (42-106)

Standard

Ethernet Fiber Optical Dual Converter 100 Mbit

Secure rack-mounted module featuring two fully independent channels, specifically designed to prevent…

Product no 60-00-7423

TEMPEST Level A · RÖS U1

Data Diode Secure 1 Gbit MM TEMPEST

Data rate
1 Gbps
Wavelength
Multimode 850 nm
Input, LC
1000 BaseSX

Product no 60-00-7303

Hands soldering a circuit board under a work lamp

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