Brand: Finisar (or Compatible third-party) · SKU: FCMJ-8521-3 · MPN: FCMJ-8521-3 · Category: Networking
The FCMJ-8521-3 is a 1000BASE-T Copper SFP Transceiver, designed to convert an optical Ethernet port (1000Base-X) into a copper Ethernet port (1000Base-T). It supports 10/100/1000Base-TX throughput up to 100m over copper connection via an RJ-45 connector. It supports 10/100/1000Base auto-negotiation. Some compatible versions operate in commercial temperature ranges (0 to 70°C), while others support industrial temperature ranges (-40 to 85°C case temperature). It is compliant with MSA (Multi-Source Agreement) standards. It is compatible with Gigabit Ethernet and 1000BASE-T standards. It is often sold as a compatible replacement for the original Finisar part.
| Data Rate | 10/100/1000Base-TX (1.25Gb/s) |
|---|---|
| Cable Type | Copper (Cat5E or Better) |
| Compliance | MSA (Multi-Source Agreement) |
| DOM Support | No (based on some compatible listings) |
| Form Factor | SFP |
| Interface Type | RJ-45 |
| Maximum Distance | 100m |
| Operating Temperature | Commercial (0 to 70°C) or Industrial (-40 to 85°C case temp) depending on specific variant |
| Warranty | Limited lifetime warranty offered by compatible vendors. |
| Weight | Varies by vendor (one source mentions 0.10 LBS) |
| Dimensions | SFP Form Factor |
The FCMJ-8521-3 is a Gigabit Ethernet SFP transceiver module designed for copper connections, utilizing an RJ-45 connector to provide 10/100/1000Base-T functionality up to 100 meters. This form factor allows designers to use standard copper cabling in ports typically reserved for optical modules, increasing design flexibility.
Yes, this Finisar 1000BASE-T Copper SFP Transceiver (Compatible) (FCMJ-8521-3) is 100% genuine Finisar (or Compatible third-party) hardware. All our products are verified by certified technicians and come with clean serial numbers ready for service contract registration.
This Finisar 1000BASE-T Copper SFP Transceiver (Compatible) includes our standard 3-Year Warranty covering all manufacturing defects. We also offer advanced replacement options for minimal downtime.
We offer free ground shipping which typically takes 3-5 business days. Expedited shipping options are available at checkout for faster delivery.
Yes, we have a 30-day return policy on all products. Restocking fees may apply for opened items. Please see our return policy for complete details.
Please check the specifications tab for detailed compatibility information. Our technical team is available to assist with compatibility questions for the FCMJ-8521-3.