StarTech CK4-P404C 4-Port Quad-Monitor Secure KVM Switch

Overview

The StarTech CK4-P404C is a NIAP Protection Profile for Peripheral Sharing Devices (PSD) 4.0-certified, 4-port quad-monitor KVM switch built for environments where physical data separation between classified and unclassified networks is a hard requirement. If you're deploying workstations in government facilities, defense contractor offices, intelligence community environments, or any high-security data center where multi-level security (MLS) operations are standard, this is the device class you need — not a conventional KVM that passes USB data transparently between hosts. Each of the four DisplayPort video channels supports up to 4K 30Hz per display, giving analysts and operators full-resolution visibility across four hosts and four monitors from a single console. The all-metal enclosure weighs 4.2 lb and measures 12.6 × 6.7 × 4.9 in — a compact desktop form factor for a device handling this level of port isolation.

Key Features

• NIAP PSD 4.0 Certification: NIAP (National Information Assurance Partnership) Protection Profile for Peripheral Sharing Devices version 4.0 is the current government benchmark for secure KVM devices. Certification at this level means the switch has been independently evaluated and validated to enforce strict isolation between connected hosts — a mandatory procurement requirement for many U.S. federal and DoD environments. Without NIAP PSD 4.0, a KVM switch cannot be used in classified or SCI compartmented workspaces.
• 4-Port, 4-Host Switching: Connects four independent computers or servers to a single console — keyboard, mouse, and four monitors. Operators cycle between hosts without ever physically touching or rewiring hardware, which reduces error risk and keeps classified and unclassified systems physically separated on the desk.
• 16 DisplayPort Female Host Connectors: Four video outputs per host (16 total host-side DP connectors) feed four monitors simultaneously per active host. That's the connector count for a full quad-display workstation deployment — relevant for intelligence workstations, command-and-control displays, and financial trading desks running four screens per operator.
• 4K 30Hz Maximum Resolution: Each display channel supports up to 4K 30Hz, delivering enough pixel density for detailed document review, multi-window monitoring dashboards, and high-resolution imagery analysis. If your workflow depends on 4K 60Hz, note that the supported maximum is 30Hz at 4K — sufficient for most static or low-motion analytical work, but not appropriate for 60Hz-dependent video workflows.
• 3× USB 2.0 Type-A Console Interface: The console side exposes three USB 2.0 Type-A ports, enough for keyboard, mouse, and one additional USB peripheral at the console. USB traffic passes through the isolation hardware — only authenticated HID device signaling crosses between host domains, blocking unintended data transfer paths.
• All-Metal Enclosure: Metal construction at 4.2 lb provides RF shielding and physical durability appropriate for a device sitting on a classified workstation desk. In NIAP-compliant facilities, tamper-evident and physically robust enclosures are part of the deployment checklist.
• Operating Temperature 0°C to 40°C (32°F to 104°F): Rated for standard office and data center environments. This is not a ruggedized or industrial unit — it belongs in climate-controlled secure workspace, not on a factory floor or in an outdoor enclosure.
• 3-Year Manufacturer Warranty: A 3-year warranty on a device that guards classified network perimeters matters more than on a generic peripheral — replacement cycles in secure facilities often have procurement lead times. Knowing the warranty window helps plan lifecycle management from the outset.

Integration and Compatibility

The CK4-P404C (often searched as CK4 P404C) is designed for multi-host secure desktop environments running DisplayPort video output. The 16 host-side DisplayPort female connectors support standard DP cables to each workstation or server. The three USB 2.0 Type-A console ports handle HID peripherals (keyboard and mouse), and the isolation architecture means USB mass storage and non-HID devices are blocked by design — this is a feature, not a limitation, in NIAP-compliant deployments.

For environments running mixed classification levels — for example, a workstation simultaneously accessing a Secret-level network and an unclassified network — this switch provides the hardware-enforced separation required by security policy. It does not replace network-level controls, but it eliminates the KVM switch as a data exfiltration or cross-contamination vector, which is the key audit concern for secure desktop infrastructure.

Check your facility's approved products list (APL) on the NIAP website to confirm the CK4-P404C listing is current for your program's accreditation cycle before procurement.

Frequently Asked Questions

Q: What does NIAP PSD 4.0 certification mean for this KVM switch?

A: NIAP Protection Profile for Peripheral Sharing Devices (PSD) version 4.0 is an independent government security evaluation that verifies the switch enforces strict data isolation between connected hosts. It is required for use in many U.S. federal and DoD classified environments and confirms the device has been tested against current secure KVM standards.

Q: Can the CK4-P404C support 4K 60Hz across all four displays?

A: No. The maximum supported resolution is 4K 30Hz per display. If your workflow requires 4K at 60Hz — such as high-frame-rate video analysis — this switch is not the correct model. For most analytical, document-review, and dashboard monitoring workflows, 4K 30Hz is sufficient.

Q: How many computers can the CK4-P404C connect at once?

A: The CK4-P404C supports four host computers simultaneously, each with up to four DisplayPort video outputs (16 host-side DP connectors total). Switching between hosts routes all four displays, keyboard, and mouse to the selected system.

Q: What USB peripherals are supported on the console side?

A: The console provides three USB 2.0 Type-A ports. These are designed for HID peripherals (keyboard and mouse). The NIAP PSD 4.0 architecture blocks non-HID USB traffic — USB mass storage and other data-class devices will not pass through, by design, to prevent data exfiltration between host domains.

Q: What is the warranty on the CK4-P404C?

A: StarTech provides a 3-year manufacturer warranty on the CK4-P404C.

Q: Is the CK4-P404C suitable for outdoor or industrial environments?

A: No. The operating temperature range is 0°C to 40°C (32°F to 104°F), which is appropriate for climate-controlled office or data center environments only. It is not rated for outdoor, industrial, or extreme-temperature deployments.

Jerry Tildsen

The CK4-P404C is one of the few desktop KVM switches I'd confidently specify into a classified or multi-domain workstation environment without hesitation — and that's almost entirely because of the NIAP PSD 4.0 certification. That evaluation isn't marketing language; it's an independent third-party security validation that the device enforces host isolation at the hardware level. When an auditor asks what prevents data from crossing between a classified and an unclassified host on the same desk, the NIAP APL listing for the CK4-P404C is the answer.

Technical Highlights:

• 16 Host-Side DisplayPort Connectors: Four DP outputs per host across four hosts means you're supporting full quad-monitor workstations on every seat — no compromise on display count even in a secure multi-host setup.
• 4K 30Hz Per Display: Each of the four monitor channels supports 4K at 30Hz, which covers analytical and document-heavy workflows cleanly. Know going in that 60Hz at 4K is not on the table — plan accordingly if any host runs motion-intensive display applications.
• 3× USB 2.0 Console Ports with HID Filtering: The console USB architecture passes only HID traffic — keyboard and mouse signals — and blocks USB mass storage by design. That's the correct behavior for a NIAP-certified device and exactly what a security officer reviewing your deployment will expect to see documented.

Deployment Considerations:

• Verify the CK4-P404C is on the current NIAP Approved Products List before your procurement cycle closes — certifications can lapse between evaluation cycles and some accreditation authorities require active APL status at time of installation, not just at time of purchase.
• Operating temperature tops out at 40°C (104°F) — this is a climate-controlled workspace device. Don't spec it into a comms room that runs hot or any environment without reliable HVAC.

For a four-operator command-and-control facility running simultaneous access to Secret and unclassified networks on quad-display workstations, the CK4-P404C is the right hardware anchor for the desktop security architecture.