4-port Secure EAL4+ KVM, DVI-I (dual-link), Audio



Replaced by: Vertiv SC840DVI-400
Alternative options: Contact Us

Ports: 4 Computer Ports
Video Type: DVI-I (DVI or VGA w/ adapter)
Video Output: Single Monitor
Features: Audio

Vertiv Cybex SC840 Brochure (PDF)
Vertiv Cybex SC840 Manual (PDF)

The Cybex SC840 secure desktop KVM is designed to meet the stringent specifications of the U.S. government and comply with the requirements of the latest NAIP protection profile for peripheral sharing devices version 3.0. The SC840 delivers proven security features such as unidirectional data diode technology, which assures complete network isolation while offering user-friendly, easy switching between sources. An active anti-tampering system and holographic tampering evident labels alert the user when the system has been physically compromised. Patented emulation technology prevents Display Data Channel (DDC) signal leakage; and guards against signal attacks.

Industry-leading security features are complemented with a range of capabilities and productivity features that make the Cybex SC840 a great investment. Experience true image reproduction with support for dual-link DVI-I, which delivers resolutions up to UHD 4K (3840X2160 @ 30 ), via DVI to HDMI cable. NUM Lock, CAPS Lock and Scroll Lock indicators improve user interaction while maintaining unidirectional data flow from peripherals to PC. Additional usability features include, zero delay switching between connected sources and flexible assignment of audio devices.

The Cybex SC840 KVM switch delivers strong, effective security management designed to tightly control system and network access and deliver transparent security that does not impede user productivity

  • Outstanding security - Designed to meet the requirements of the latest National Information Assurance Partnership (NIAP) Protection Profile V3.0 for peripheral-sharing devices.
  • Discrete processing paths - Isolated ports on the switch provide discrete processing paths to each system, preventing data leakage, transfer or crosstalk between adjacent ports.
  • Unique NUM Lock, CAPS Lock and Scroll Lock indicators - While the Cybex series maintains unidirectional data flow, it also provides indicators that alert users when the NUM Lock, CAPS Lock or Scroll Lock is on to improve ease of use.
  • Gain true image reproduction and display flexibility - Cybex KVM switches offer the industry's broadest range of video connections. The SC840 supports dual-link DVI-I, which delivers resolutions up to UHD 4K (3840X2160 @ 30), via DVI to HDMI cable.

         *** PLEASE NOTE: For DVI-D video cards please use Vertiv DVI-D only cables. For VGA video cards please use VAD-28 with Vertiv DVI-I cables

SC840 KVM Back View

SC840 back view

Avocent SC840-001 Specifications:

Height 1.7 in (42 mm)
Width 13.7 in (342 mm)
Depth5 in (125 mm)
Weight3.2 lbs (1.6 kg)
Video​1 x DVI-I, single-link/dual-link
HDMI and VGA with adapter
MAX ResolutionUHD 4K - 3840x2160 pixels @ 30 Hz (via DVI to HDMI cable)
DVI dual-link - 2560x1600 pixels @ 60 Hz (via DVI cable)
VGA - 2048x1536 pixels
Operating Temperature32° to 104°F (0° to 40°C)
Storage Temperature-4° to 122°F (-20° to 50°C)
Humidity0-80% RH, non-condensing
Operating Voltage100 to 240VAC
Power Consumption35W Max Internal
Device Support
ComputersUSB and single-head or dual-head DVI-I
CertificationsRCM, EU, FCC Class B, VCCI, c-UL
Warranty3 Years

Avocent Cybex (by Vertiv) SC840 is also known as SC 840

UPC / EAN Barcode icon
UPC 636430075303
EAN 0636430075303
Question: Is SC840 TAA compliant?
Answer: Thank you for your inquiry,

We have confirmed with the manufacturer that the Avocent SC840 Secure KVM is indeed TAA compliant.

Question: How do you do the IR switching?
Answer: Thank you for your inquiry,

The Avocent (by Vertiv) SC840 features a RCU (CONSOLE Remote Control Unit) port for switching the device. Note however, upon inquiring about this with the vendor, they informed us that "as of right now that port has not been activated so the remote control capability is not available yet".

For a similar alternative product with remote control, you may be interested in:
Adder AV4PRO-DVI which features remote control capability via an optional RC4 remote switch.
Gefen EXT-DVIKVM-441DL, which includes the RMT-4IR Infrared Remote Control.
SmartAVI HDC-IRS IR extender.

For a recommendation based on your application, please feel free to contact your KVM Switches Online sales representative.

Question: Do you have a pin out detail for the RCU port on the SC840-001
Answer: Thank you for your inquiry. Unfortunately, a pin out diagram is not available for the RCU port as it is curently inactive and was added for future use.

Since the RCU port is for future use, the manufacturer has not created any pin-out documents yet.

Question: Can you please provide the country of origin (COO) of the SC840-001? Are they manufactured in the United States?
Answer: Thank you for your inquiry,

According to the vendor, the SC840-001 is manufactured in USA. The Harmonized Tariff Schedule (HTS) for SC840 is 8471.80.1000, the Export Control Classification Number (ECCN) is EAR99, and it is Self Classified.

Please let us know if there is anything else we can ever help you with!