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ServSwitch Secure KVM Switch with USB, EAL4+ Certified, DVI, 2-Port  

Combat security threats with this hard-wired KVM switch for DVI video.


Extended Double Diamond™ Warranty Available (3 Additional Year)

Product Highlights

  • Get a high level of port-to-port electrical isolation, which facilitates data separation (RED/BLACK).
  • Channel-to-channel 60-dB crosstalk isolation protects against signal snooping.
  • Permanently hard wired, preventing access from one CPU or network to the others.

    Tempest certified per SDIP27 Level A and NSTISSAM Level 1 Specifications. NSA has not confirmed product meets specific NSA Tempest Standards at this time.

    Further Details

  • External tamper-evident seals.
  • Supports DVI-I video, which is DC balanced and may be encoded for security.
  • Provides robust isolation between networks, so it's ideal for government applications that access classified networks in addition to public networks such as the Internet.
  • Constructed with a solid metal case and a long-wearing switching mechanism.
  • USB host controller erases entire RAM to prevent residual data remaining on channel.
  • Dedicated DDC bus and EDID memory emulation at each port.
  • Clear, unmistakable channel selection.
  • Non-Flash-upgradable ROM.
  • To minimize electronic signaling, no common power supply.

    The ServSwitch™ Secure KVM Switch with USB, EAL4+ Certified, DVI offers not only superior hardware-based data-isolation features, but it has also been certified for Common Criteria Evaluation Assurance to Level 4+ (EAL4+), augmented by ALC_FLR.2 and ATE_DPT.2.

    The Common Criteria is an international standardized process for information technology security evaluation, validation, and certification. The Common Criteria scheme is supported by the National Security Agency through the National Information Assurance Program (NIAP). EAL4+ itself defines a common set of tests to evaluate the security of an IT product relating to its supply chain, from design and engineering to manufacturing and distribution.

    The ServSwitch Secure KVM Switch with USB, EAL4+ Certified, DVI provides control and separation of two PC CPUs/servers connected to secure and non-secure networks through just one keyboard, monitor, and mouse. Users can safely switch among the connected computers operating at different classification levels without worry.

    Threats/Solutions Scenarios

    1. Prevent data leaking between ports and to the outside world.

    Threat: Microprocessor malfunction or unanticipated software bugs cause data to flow between ports.
    Solution: Unidirectional keyboard and mouse data flow is enforced by hardware "data diodes" so data isolation doesn't rely on software integrity. This makes it impossible for the computer to send data along the keyboard and mouse signaling channel. This advanced design also ensures data isolation through hardware and prevents the keyboard and mouse interfaces from becoming covert computer-to-computer signaling channels because of software holes or unanticipated bugs.

    In addition, keyboard and mouse devices can only be enumerated at the keyboard and mouse ports. Any other USB peripherals, such as a USB thumb drive, will be inhibited from operating, preventing any uploading or downloading of data.

    Threat: Physical proximity between ports enables data leakage.
    Solution: Isolation is improved by placing the red and black ports at the opposite edges of the switch.

    Threat: Accidental port switching.
    Solution: Locked-down operation disables all keyboard hotkey and mouse switching functions in both software and hardware so that data corruption can't inadvertently cause an unanticipated channel change. The only way to change the channels is with the front-panel keys. There is only one button per channel, so channel selection is clear. Color-coded visual feedback confirms the channel selection.

    Threat: Signaling by shorting the power supply or loading the power.
    Solution: Each port is independently powered by its USB port. Shorting the power supply on one port will not cause the power on the other ports to be switched off. The shared keyboard, mouse, and monitor circuitry are powered by the power supply. The lack of a common power supply minimizes electronic signaling.

    Threat: Detection of signals on one computer by monitoring for crosstalk (leakage) signals on another computer.
    Solution: Minimum crosstalk separation of 60 dB provided between signals from one computer and input or I/O signals to another. There are no connections to sensitive analog inputs, such as computer microphone ports. Microphone circuitry enables sensitive recording of small analog signals. Even very low crosstalk levels could be recorded and act as a means by which a non-selected computer could read data being sent to another computer.

    Threat: Timing analysis attacks (looking at what happens on one port to determine data flow patterns on another).
    Solution: Only one computer is connected at a time to any shared circuitry. Links are unidirectional, preventing timing analysis.

    Threat: Electromagnetic emissions.
    Solution: Special low emissions cables are used to minimize radiated electromagnetic signal leakage. Filtered power connections minimize emissions down the power lines.

    2. Prevent data from being stored in the device.

    Threat: Data transfer by means of common storage or common RAM.
    Solution: Shared circuitry and the keyboard and mouse are powered down at each channel change to clear all volatile memory of any previous connections. This erases the entire RAM, preventing residual data from remaining in the channel and being transferred to another computer. In addition, the USB host controller and the shared USB peripherals are also powered down, reset, and re-enumerated. This ensures no residual data transfer.

    3. Prevent electronic snooping.

    Threat: Subversive snooping by detecting electromagnetic radiation emitted from the equipment.
    Solution: The shielded metal case features double shielding in critical areas and a low emissions profile to thwart eavesdropping.

    Threat: Physically tampering with the switch.
    Solution: The switch is designed with tamperproof seals to be fitted over the countersunk screws.

  • Distance (Maximum) Cable length: 16 ft. (4.9 m)
    Resolution (Maximum) Digital: 165 MHz per DVI link, dual-link DVI supported;
    Analog: 1920 x 1280
    CE Approval Yes
    RoHS Yes
    Connectors CPU: (2) DVI-I F, (2) USB Type B F, (2) 3.5-mm audio jacks;
    User: (1) DVI-I F, (2) USB Type A F, (1) 3.5-mm audio jacks;
    Power: (1) 2.5-mm barrel F
    Power Input: 100-240 VAC, 50-60 Hz, external, 0.5 amps (maximum)
    Output: 5 VDC, 2.5 amps (maximum), 12.5 watts
    Size 1.75"H (1U) x 9.25"W x 5.9"D (4.4 x 23.5 x 15 cm)
    Weight 1.2 lb. (0.5 kg)

    This product works with:
  • DVI and USB to DVI and USB Cable, 6-ft. (EHN900024U-0006)
  • DVI and USB to DVI and USB Cable, 10-ft. (EHN900024U-0010)
    Questions? Contact our FREE Tech Support.

    NOTE: Technical specification weight is the unit weight. It is not the packaged shipping weight. For shipping weight, please contact Black Box customer service at 1-800-316-7107.

  • Visio Stencils

    • Visio Stencil
      Stencil Drawings


    Accessory: EHN900024U-0006

    ServSwitch DVI Cable, 6-ft. (1.8-m)

    ServSwitch DVI Cable, 6-ft. (1.8-m)

    Accessory: EHN900024U-0010

    ServSwitch DVI Cable, 10-ft. (3.0-m)

    ServSwitch DVI Cable, 10-ft. (3.0-m)

    Double Diamond Warranty
    Extended Double Diamond™ Warranty Available (3 Additional Year)

    Double Diamond™ Warranty (Standard)


    Take the risk out of equipment purchases with the Double Diamond™ Warranty from Black Box Network Services.

    The Double Diamond Warranty is our warranty that protects your Black Box® brand products* from accidental damage, including drops, water, and power surges.

    The ServSwitch Secure KVM Switch with USB, EAL4+ Certified, DVI, 2-Port comes with a standard 2 Year warranty already included.

    During the warranty period, Black Box Network Services will repair or replace your damaged equipment within one week of receipt at NO CHARGE!*

    Plus, get an Extended Double Diamond Warranty.

    You can also extend your warranty or protect a previously purchased Black Box® brand product** for an additional year—for only 10% of the purchase price! Or, extend your coverage for a full three years for only 20% of the purchase price!

    Ordering an extended warranty is easy: When viewing a product in your shopping cart, just select the one or three years of additional coverage in the dropdown menu under “Warranty Options.” For details, contact Customer Service at 724-746-5500.

    * Warranty subject to certain exclusions and limitations
    ** Certain products may not be eligible.

    What’s more, we also have a 45-day return policy. Simply call Customer Service for a Return Authorization (RA) number, return your product in new condition and in the original package, and receive a full refund.

    Product SKU Price Quantity
    ServSwitch Secure KVM Switch with USB, EAL4+ Certified, DVI, 4-Port SW4008A-USB-EAL $654.43
    You can find this product in the following subcategory(s)

    Add to Cart

    Price: $610.79

    Quantity Available: 54




    Shipping Info

    In Stock - orders received before 5PM ET ship same day

    Weight: 4.312 lbs.
    HxWxD: 3 x 7.5 x 16.75 in.

    What’s more, we also have a 45-day return policy. Simply call Customer Service for a Return Authorization (RA) number, return your product in new condition and in the original package, and receive a full refund.

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