Black Box LHC040A-R4

Overview

The Black Box LHC040A-R4 is a compact Fast Ethernet media converter designed to extend your network from copper to multimode fiber with minimal effort. It supports 10 or 100 Mbps traffic on its RJ45 port and transmits data at 100 Mbps over fiber, enabling seamless connections between desktops, switches, or industrial controllers and distant fiber backbones without replacing existing copper infrastructure. Its small size and flexible power options make it ideal for tight spaces and varied installation environments.

Key features

• Converts 10/100 Mbps copper Ethernet signals to 100 Mbps multimode fiber, allowing longer distance network connections.
• Compact housing measuring 0.8 by 1.8 by 3.4 inches fits easily behind equipment or inside cabinets with limited space.
• Multiple power options including an included AC adapter, optional USB power cable, or rack-mountable PowerTray for centralized power management.
• Auto MDI/MDI-X function automatically detects and configures the correct Ethernet pinout, eliminating the need for crossover cables.
• Twisted-pair port supports 10/100 Mbps autonegotiation to ensure smooth communication with connected devices.

Key specs

• Data rate: 10/100 Mbps on RJ45 port, 100 Mbps on multimode fiber
• Fiber type: Multimode
• Dimensions: 0.8 x 1.8 x 3.4 inches
• Power options: External AC adapter, optional USB power cable, PowerTray rack mount support
• Auto MDI/MDI-X: Yes
• Port type: RJ45 for copper Ethernet

Connectivity and compatibility

This media converter supports standard Ethernet patch cables thanks to its Auto MDI/MDI-X feature, simplifying installation without worrying about cable types. It connects easily to existing copper devices such as desktops, switches, or industrial controllers and links them to fiber backbones using multimode fiber cables. The unit’s compatibility with 10 and 100 Mbps Ethernet devices ensures it fits well into a variety of network setups without requiring specialized hardware.

Installation and setup

Installation is straightforward due to the converter’s small footprint and flexible power options. It can be placed discreetly behind computers, under counters, or inside control cabinets where space is limited. The included AC adapter powers the unit from a standard outlet, while an optional USB power cable offers an alternative when outlets are scarce. For larger deployments, the PowerTray rack mount allows multiple converters to share a single power source, simplifying cable management and reducing clutter.

Ideal uses and environments

This converter is well suited for small offices needing fiber connections between rooms, production floors requiring immunity to electromagnetic interference, and remote equipment closets with limited fiber availability. It provides a cost-effective way to extend fiber networks without investing in fiber network interface cards for every endpoint, making it a practical choice for environments where space, power flexibility, and reliable fiber connectivity are priorities.

Orders are processed within 2 business days, which includes verification, packing, and dispatch. Shipping costs are calculated at checkout based on destination, total weight, and selected speed. Free shipping applies to carts over $100 (excluding heavyweight items). All available options and final pricing are clearly shown before payment so you can choose the service that best fits your needs.

Deliveries are handled by major carriers such as USPS, UPS, and FedEx. Estimated delivery times are displayed at checkout and may vary depending on service level and location. Please note that these are estimates and can be affected by weather, holidays, or carrier volume. Once your order ships, you’ll receive a tracking number for real-time updates from pickup to final delivery.

Providing an accurate shipping address helps prevent delays, and changes may be limited once the order has been dispatched. P.O. boxes are supported only when permitted by the selected carrier. Packaging and handoff are optimized to protect items during transit, though oversized or high-weight products may require special handling. All shipping methods and any related constraints are clearly shown during checkout.

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Returns are accepted within 30 days of delivery. Items must be unused, in the same condition received, and include all tags, manuals, accessories, and original, unaltered packaging. To start a return, please email us for approval. Items sent back without approval may be refused or returned to the sender. If any item is kept, its value will be deducted from the refund.

Non-returnable items include opened TVs, combos, or monitors 37″ or larger, opened computers or software, electronic downloads, opened consumables (film, paper, bulbs, media, ink), custom or modified computers, special-order or “nonreturnable” items, submerged underwater gear, and opened educational media.

After inspection, refunds are issued to the original payment method. Please allow 5–7 business days for the credit to post. Shipping and handling are nonrefundable. If an item is used, incomplete, or not in its original condition, a 30% restocking fee may apply. Direct exchanges are not offered. To exchange an item, please purchase the replacement separately and return the original for a refund.

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We act solely as a reseller. Any product warranty is provided and administered by the manufacturer, not by our store. That means eligibility, coverage, and outcomes are determined by the manufacturer’s policy for each brand and model. Before purchasing, we recommend reviewing the warranty terms on the manufacturer’s website or in the product documentation to confirm what is covered and for how long.

If you need warranty service, please file the claim directly with the manufacturer. They may require proof of purchase, the product serial number, original packaging, photos, or basic troubleshooting. Some brands ask you to register the product or obtain a case number before shipping it for repair or replacement. We don’t submit or approve claims, but we can point you to the correct support links and contact details.

Keep your invoice and packaging in a safe place, and report any functional issues to the manufacturer as soon as they appear. If you’re unsure whether a problem is covered, the manufacturer’s support team can confirm next steps and timelines. While we cannot intervene in decisions or outcomes, we’re happy to provide purchase documentation or guidance so you can move through the warranty process smoothly.

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