Systems integrators
The sensor vendor's install guide asks for a SPAN feed and leaves the rest to you. When the site wants a hardware guarantee that nothing travels back, a data diode fills that line, with a SKU and a published price for the BOM.
Hardware Data Diodes
One-way data out, nothing back in. A hardware data diode moves monitoring data out of the control network with no return path to configure or misconfigure.
- Pre-tested in our IT/OT lab
- Pricing published up front
- Spec’d, priced, shipped — no vendor onboarding
Shop Hardware Data Diodes
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Garland Hardware Data Diode
SKU:CTAP-P1GCCREG
Vendor:Garland TechnologyGarland Hardware Data Diode
Hardware Data Diodes provide network traffic for out-of-band monitoring, specifically designed not to send traffic ba...- Regular price
- $1,440.00
- Sale price
- $1,440.00
- Regular price
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What data diodes are, and what they aren't
A data diode is hardware that lets traffic move in one direction only, so data can leave the control network and nothing can come back in. It gives you visibility into an OT network without opening a path into it.
A data diode isn't a firewall. A firewall decides what to allow in both directions. A diode has no return path to configure. It isn't a network TAP either: a TAP copies the traffic on a link, while a diode guarantees that whatever it carries only travels one way.
Every diode here is made by Garland Technology. Each has been through our IT/OT lab and carries a published price, so you can put it straight onto a bill of materials.
Why data diodes belong in an OT defense
Data diodes ensure controlled data flow out of OT environments. They let monitoring and operations data leave the plant while keeping the control network closed to anything coming back.
Unidirectional data flow
Data diodes enforce one-way communication — preventing remote cyberattacks while allowing safe data extraction for monitoring.
Eliminated attack vectors
Unlike traditional network devices, data diodes physically block unauthorized inbound traffic — reducing the risk of malware or remote exploits.
Nothing to misconfigure
A firewall is only as good as its rules. A diode enforces its boundary in hardware, so there is no rule that can be changed to let traffic back.
Who buys data diodes from OT Cyber Direct
Join the OT services marketplace
Asset owners
You've bought or been quoted an OT monitoring platform and need traffic for it without adding risk. A data diode gets the traffic to the sensor with no path back into the control network, which is usually the first thing an operations team asks about.
Assessment teams
When an assessment ends in a recommendation for one-way monitoring at the boundary, the diode here gives you a part number and price to put in the report.
Data diode placement across the Purdue model
A data diode at Level 3 moves historian and sensor data upward with no return path.
Data diode questions buyers ask
Question not listed? Email info@otcyberdirect.com or call (508) 289-1195.
How much does a data diode cost?
The Garland Hardware Data Diode is $1,440. The price is published on the product page.
Data diode or firewall: which do I need?
They do different jobs. A firewall filters traffic in both directions according to rules. A data diode allows one direction only, so there is no rule that can be misconfigured to let traffic back. Many sites use a firewall at the IT/OT boundary and a diode on the link that carries monitoring data out.
What does the hardware data diode connect to?
It takes two SPAN feeds from managed switches and passes them one way to two copper monitor ports, one per input. It doesn't aggregate them.
Do I need a data diode or a TAP?
A data diode moves data one way out of the control network. A TAP copies the traffic on a link to a monitoring tool, and is the option when the switch is unmanaged and has no SPAN port. See our network TAPs.
Does it fit in a control panel?
The data diode takes optional DIN mounting hardware, listed as an accessory on the product page.
Who ships the order, and how fast?
Garland ships from its own facility with its own tracking code. Ground shipping is free on most products, and some vendors offer overnight for orders placed before 12 PM ET. These products ship within the US only.