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Both optical port modules and electrical port modules are compatible

Fiber and communications infrastructure knowledge brief Published 29 Jun 2026

Prepared for preliminary research by the ROGER FIBRE knowledge desk. Confirm optical interfaces, port or core capacity, electrical input and output, enclosure protection, thermal design and installation limits against current standards and product documentation.

To connect an electrical port module (RJ45) to an optical port module (SFP), you need an SFP electrical module as a converter and the appropriate copper or fiber cabling.

Understanding the Modules

Electrical port modules use RJ45 connectors and UTP cables for short-distance Ethernet transmission, typically up to 100 meters, and are designed for 100M, 1G, or 10G speeds depending on the module type. Optical port modules (SFP) use fiber optic connectors and transmit data via light pulses over single-mode or multi-mode fiber, supporting longer distances and higher bandwidths. These ports cannot directly connect to copper RJ45 ports without a conversion module.

Step-by-

Step Connection

Select the Correct SFP Electrical ModuleFor Gigabit connections, use a Gigabit electrical SFP module (e.g., ES-T1-R for 1000M or ES-T2-R for 10/100/1000M adaptive) that fits into the SFP slot of the switch. For 10G connections, use a 10G SFP+ to RJ45 module with Cat6A or Cat7 cables for stable transmission up to 30 meters. Insert the Electrical Module into the SFP PortPlug the SFP electrical module into the optical SFP port on the switch or network device.

This converts the optical interface to an electrical RJ45 interface. Connect the RJ45 CableUse a Cat5e, Cat6, or Cat6A UTP cable to connect the RJ45 port of the electrical module to the corresponding RJ45 port on the other device. Ensure the cable supports the required speed and distance.

Verify Plug-and-

Play Operation

Most SFP electrical modules support auto-negotiation and full-duplex transmission, so no additional configuration is typically required.

Important Considerations

Distance Limitations: Electrical modules over copper are limited to ~100 meters, while optical modules can reach kilometers depending on fiber type. Compatibility: Ensure the SFP module matches the switch's SFP slot type and supports the intended speed. Fiber Type Consistency: If connecting fiber modules, maintain consistent single-mode or multi-mode components; do not mix SX (multimode) with single-mode adapters.

By following these steps, you can successfully interconnect an electrical RJ45 port with an optical SFP port using the appropriate SFP electrical module and cabling.

Both optical port modules and electrical port modules are compatible - ROGER FIBRE ATELIER [PDF]

Both optical port modules and electrical port modules are compatible

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Technical note

This reference is intended for preliminary fiber and communications infrastructure research. Optical interface, fiber type, port or core capacity, electrical input and output, enclosure protection, cooling, installation limits and applicable standards must be verified for the specific project.

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