XD Guardian™

Cross Domain Guard for Non-U.S Networks

XD Guardian™ brings our proven cross-domain solution capabilities to international customers.

With its unmatched flexibility, reduced costs, and high performance, XD Guardian brings cross domain information transfer to a new level. The functional equivalent of XD Bridge, XD Guardian is exportable and ideal for use by:

  • Foreign governments
  • Non-U.S. industrial, nuclear, and utility organizations
  • System integrators with international business

Secure and Adaptable

A dual-guard, quad-diode cross domain appliance, XD Guardian:

  • Provides strong security at each system layer: hardware, operating system, and filters
  • Supports both unidirectional and fully bidirectional transfer modes
  • Features best-in-class performance with 1 Gb network interfaces delivering high throughput, low latency data transfer

The most cost-effective cross domain solution (CDS) in the market today, XD Guardian is available in a standard 1U 19" rack-mountable configuration for use in enterprise applications or in remote or isolated environments. Depending on your application requirements, multiple tactical forms factors are also possible.

Flexible Filtering

Filters are available for both file transfer and streaming protocols such as full-motion video.

The XD Guardian file transfer filter can perform:

  • File type whitelist/blacklist
  • Antivirus scanning
  • XML schema validation

To meet unique requirements, the product’s design enables rapid development of data-filtering capabilities, including custom security policies and filters. In addition, Tresys offers a two-day filter development course that enables customers or integrators to easily develop custom filters.

XD Guardian™ provides a flexible, modular platform for deploying cross domain data transfer filters. Certified filters exist for file transfer and streaming applications. The architecture allows additional special purpose filters to be developed and deployed as requirements evolve.

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The Only SABI-Certified Exportable CDS

XD Guardian is certified under the Secret and Below Interoperability (SABI) requirements and is RTB compliant. It is also undergoing a second SABI evaluation sponsored by MDA for the FMS standards for use by foreign nation military and intelligence organizations in classified operations with U.S. entities. XD Guardian is exportable for commercial deployments worldwide in organizations that require military-grade data transfer assurance.



18-7/8" x 28" x1.75"


18.5 lb.


132W @ idle, 220W maximum


750 BTU max and 450 BTU typical

Power supply voltage

100-240VAC, 5.5-2.5A, 47-63Hz

Ports (per side)

10/100/1000 Ethernet (data transfer), 10/100 Ethernet (management), ST Fiber
(1 transmit, 1 receive), DataKey (active on boot only), USB 2.0 (keyboard), VGA (video),
Tubular pin lock (key load lock)

Operating temperature

-10° to 50°C

Storage temperature

-40° to 70°C

Altitude (unpressurized)

4,600 m. (15,000 ft.)


Maximum 90% noncondensing relative humidity

XD Guardian Data Sheet

Tresys CDS Products Combine to Reduce Cost, Effort

XD Guardian and XD Bridge form a powerful combination for customers or system integrators that need to support cross domain applications that connect to both U.S. and foreign networks. Since both systems are functionally equivalent, the time, cost, and effort of deploying and maintaining U.S and international systems in tandem are significantly reduced.