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The Black Box LFP421 is a compact Fiber to Ethernet Media Converter designed to connect legacy copper Ethernet devices to fiber-based networks. Supporting Fast Ethernet speeds of 100 Mbps and a distance reach of up to 10 km over single-mode fiber (SC connector), it is ideal for extending LANs over long distances.
As an official Black Box product, the LFP421 provides guaranteed compatibility and reliability, ensuring robust and energy-efficient performance in enterprise, campus, and industrial environments.
This Media Converter bridges electrical Ethernet signals to optical fiber for long-distance, EMI-resistant networking. It provides plug-and-play deployment with auto-sensing for speed and duplex, SC fiber port, and standard RJ-45 Ethernet interface.
The LFP421 supports advanced features including auto-negotiation, Link Fault Pass-Through (LFPT), loopback diagnostic support, and LED indicators for status monitoring. Its durability and compact chassis make it perfect for space-constrained racks or standalone use.
The Black Box LFP421 delivers reliable and extended Ethernet connectivity over fiber, protecting networks against interference and distance limitations. It ensures stable throughput with minimum latency, providing mission-critical reliability for businesses, education, government, or industrial use.
| Specification | Details |
|---|---|
| Part Number | LFP421 |
| Brand | Black Box |
| Product Type | Fiber to Ethernet Media Converter |
| Data Rate | 100 Mbps (Fast Ethernet) |
| Fiber Type | Single-Mode Fiber (SMF) |
| Connector | SC Connector |
| Maximum Distance | Up to 10 km |
| Wavelength | 1310 nm |
| Duplex Support | Full / Half duplex (auto-negotiation) |
| RJ-45 Port | 1 × 10/100 Mbps copper port |
| Auto MDI/MDIX | Supported |
| Diagnostics | Loopback, LFPT (Link Fault Pass-Through) |
| Indicators | LEDs: Power, Link/Activity, Speed |
| Power Supply | External DC (varies by SKU) |
| Power Consumption | < 3W typical |
| Operating Temperature | 0°C to 50°C |
| Storage Temperature | -20°C to 70°C |
| Humidity | 5–95%, non-condensing |
| Enclosure | Compact metal case |
| Compliance | IEEE 802.3u (Fast Ethernet), RoHS, CE |
| Warranty | Backed by Black Box warranty |

All packages are shipped same day if the order is placed before 3PM CST
We use UPS/FedEx to ship the packages with different service levels offered by UPS/FedEx
Overnight Shipping take 1 business day
Expedited Shipping take about 2-3 business days
Ground shipping take about 3-5 business days
You can select the desired service level at Checkout and we will make sure the package is shipped as per the selected service level.
We Accept
i) PayPal
ii) All Credit & Debit Cards
iii) Purchase Orders
iv) Check
v) Bank Transfer/ACH/Wire Transfer
To process the order through Paypal/CC, you can simply checkout and process the payment.
If you want to issue us Purchase Order/Check/Bank Transfer, Please contact us at the following details
Call: 469.458.9636
Email: sales@dcsupplies.net
If you have any queries, please contact us at the following details and we will be happy to help
Call
469.458.9636
469.458.9638
Email
sales@dcsupplies.net
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Black Box LFP421 Fiber to Ethernet Media Converter, 100 Mbps, SC, 10 km
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