Black Box ACX1MR-HDO-SM DKM Flex Single-Mode Fiber KVM Receiver Module

Overview

The Black Box ACX1MR-HDO-SM is the single-mode fiber receiver module for the DKM Flex Distributed KVM Matrix system — the component that lives at the destination end (operator console) of a fiber-extended KVM link. Where multimode fiber tops out at a few hundred meters, this module's single-mode design extends that reach to 10 km over LC-terminated single-mode cable, making it the right choice for campus-scale broadcast facilities, large government complexes, and any environment where the control room is simply too far from the equipment rack for copper or multimode to bridge.

The ACX1MR-HDO-SM slots into Black Box DKM Flex chassis (ACX288 and ACX128 series), drawing power directly from the chassis backplane — no wall adapters, no separate power bricks at the console end. A single module handles DVI-D video, USB HID (keyboard and mouse), and stereo analog audio over one fiber run, keeping cable infrastructure clean and manageable across large deployments.

For integrators evaluating the Black Box DKM product line or comparing it against competing KVM matrix platforms, the ACX1MR-HDO-SM (often searched as ACX1MR HDO SM) represents the long-distance receive side of a purpose-built enterprise matrix switching architecture — not a point-to-point extender kit, but a modular blade that participates in a fully switched, any-source-to-any-destination matrix fabric.

Key Features

• 10 km Single-Mode Fiber Reach: Standard multimode OM3/OM4 fiber maxes out around 300–500 m for high-bandwidth video signals. Single-mode fiber eliminates that ceiling entirely, enabling control rooms to be located in a completely different building from the AV or compute equipment — a real architectural advantage in campus broadcast, military C2, and large utility SCADA environments.
• DVI-D Single-Link at 1920×1200 @ 60 Hz: Full WUXGA resolution passes without compression artifacts or frame-rate compromise. For operators working with detailed schematics, broadcast monitoring, or high-resolution security management consoles, this means pixel-for-pixel fidelity at the workstation regardless of fiber distance.
• USB HID Pass-Through: Keyboard and mouse signals travel back over the same fiber link — no separate USB extender run required. The latency introduced over even a 10 km single-mode run is imperceptible in normal KVM use, keeping operator response feeling local.
• Stereo Analog Audio: Audio accompanies the video and HID data over the same fiber infrastructure, eliminating the need for a parallel audio distribution system to the console. Useful in broadcast control rooms and security operations centers where audio monitoring is part of normal workflow.
• Chassis-Powered Blade Design: The module draws power from the DKM Flex chassis backplane, so there is nothing to plug in at the console end beyond the fiber and peripheral cables. This simplifies installation significantly in dense multi-seat deployments where power at the desk is at a premium.
• Matrix-Native Architecture: Unlike point-to-point KVM extenders, the ACX1MR-HDO-SM participates in a fully switched DKM matrix fabric. Any receiver module in the chassis can be assigned to any transmitter source via the matrix controller — enabling dynamic source switching, preset recall, and centralized management across dozens or hundreds of endpoints simultaneously.
• TAA Compliance: The ACX1MR-HDO-SM is TAA-compliant, making it eligible for US federal, DoD, and GSA Schedule procurement where Trade Agreements Act compliance is a contract requirement — a common hard gate in government AV and command-and-control deployments.

Integration & Compatibility

The ACX1MR-HDO-SM is designed exclusively for use within the Black Box DKM Flex matrix switching ecosystem. It requires a compatible DKM Flex chassis (ACX288 or ACX128 series) and pairs with the corresponding DKM single-mode transmitter module (ACX1MT-HDO-SM) at the source end. The module is not a standalone extender — it functions only as part of a populated matrix chassis.

Source compatibility includes DVI-D equipped workstations, servers, and AV processors. For deployments that require HDMI sources or displays at the console end, Black Box offers adapter plates within the DKM Flex accessory ecosystem; confirm compatibility with specific adapter SKUs before specifying. USB HID support covers standard keyboard and mouse peripherals — USB isochronous devices (webcams, audio interfaces) are not supported over the HID path.

Fiber infrastructure must be LC-connector single-mode (OS1 or OS2) to achieve the rated 10 km distance. Patch panels, splice points, and connector loss budgets apply — plan the optical link budget before assuming maximum distance in a dirty or heavily patched plant. Integration with KVM distribution systems at scale benefits from pre-commissioning fiber plant validation with an OTDR.

System control and switching logic is handled by the DKM matrix controller, not the individual module. Administrators manage source-to-destination assignments via Black Box's matrix management software or RS-232 control interface. For facilities using a third-party control system (Crestron, AMX, Extron), verify the specific DKM controller's serial command set compatibility before deployment.

Frequently Asked Questions

Q: What chassis is required to use the ACX1MR-HDO-SM?

A: The ACX1MR-HDO-SM is a blade module designed for Black Box DKM Flex matrix chassis — specifically the ACX288 and ACX128 series. It cannot operate as a standalone unit and must be installed in a compatible chassis to function.

Q: What is the maximum distance supported by the ACX1MR-HDO-SM?

A: Over LC-terminated single-mode fiber (OS1 or OS2), the ACX1MR-HDO-SM supports distances up to 10 km — far exceeding multimode limits. Actual achievable distance depends on your optical link budget, including connector loss and splice points in the fiber plant.

Q: Is the ACX1MR-HDO-SM TAA-compliant for federal procurement?

A: Yes. The ACX1MR-HDO-SM is TAA-compliant, making it eligible for US federal, DoD, and GSA Schedule contracts that require Trade Agreements Act compliance.

Q: What video resolution does the ACX1MR-HDO-SM support?

A: The module supports DVI-D single-link video up to 1920×1200 at 60 Hz (WUXGA). It does not support dual-link DVI or HDMI natively at the module level — check Black Box's adapter accessory line for display-side conversion options.

Q: What is the paired transmitter module for the ACX1MR-HDO-SM?

A: The corresponding source-end transmitter is the ACX1MT-HDO-SM — the DKM Flex single-mode fiber transmitter module. Both modules must be installed in compatible DKM Flex chassis on their respective ends of the fiber link.

Q: Does the ACX1MR-HDO-SM require a separate power supply at the console?

A: No. The module is chassis-powered via the DKM Flex backplane. No external power supply is needed at the receiver end, which simplifies console installations in multi-seat deployments.

Jerry Tildsen

The ACX1MR-HDO-SM is the piece of the DKM Flex puzzle that makes truly long-distance matrix KVM feasible — single-mode fiber at up to 10 km means a broadcast master control room or federal command center can sit in a physically separate building from the server or AV plant with no signal degradation at the console. In over a decade of specifying KVM matrix systems, single-mode reach at this distance is the deciding factor in campus-scale C2 and broadcast projects where multimode simply isn't on the table.

Technical Highlights:

• 10 km Single-Mode Reach: At OS2 single-mode fiber, you're looking at a 10 km optical budget — enough to span a large government campus, hospital complex, or broadcast facility with room to spare for patch panel losses.
• 1920×1200 @ 60 Hz DVI-D: Full WUXGA resolution, uncompressed, over fiber. Operators at the console see exactly what's at the source — no compression artifacts, no dropped frames, no perceptible latency in the HID return path.
• TAA Compliance: For any federal, DoD, or GSA procurement, TAA compliance on this module is a hard requirement, not a nice-to-have. The ACX1MR-HDO-SM checks that box, which often narrows the competitive field considerably on government contracts.

Deployment Considerations:

• Plan your optical link budget carefully before assuming the full 10 km is achievable. Every patch panel connector, splice, and bend adds insertion loss — in a fiber plant with multiple distribution frames, you may be working with an effective budget closer to 7–8 km.
• The ACX1MR-HDO-SM handles USB HID only — standard keyboard and mouse. If your console workstations need USB isochronous device support (smartcard readers, CAC readers, audio interfaces), verify that the DKM Flex chassis controller firmware and any USB extension modules in the system support those device classes before committing to this architecture.

This module is the right specification for large federal command-and-control installations, campus broadcast master control, and utility SCADA environments where the control room and the equipment plant are in separate buildings and the fiber plant is already OS1/OS2 single-mode — which in any facility built or renovated in the last 15 years, it almost certainly is.