SFP module Extralink EX.35894 1.25Gbps LC/UPC 1310nm 2km single-mode DOM 2-pack

Extralink EX.35894 SFP module is a hot-pluggable transceiver designed for 1.25Gbps single‑mode fiber links. Each module in this 2‑pack uses an LC/UPC connector and operates at a 1310 nm wavelength, supporting reliable optical transmission up to 2 km. The module supports Digital Optical Monitoring (DOM) for real‑time measurement of operational parameters including temperature, supply voltage, laser bias current, and transmitted/received optical power, making it suitable for uplinks, switches and routers in access and campus network environments.

Advantages

The Extralink EX.35894 provides a predictable 1.25Gbps data rate over single‑mode fiber with a 2 km reach and industry-standard LC/UPC interface, enabling straightforward integration with compatible network equipment. DOM capability offers remote visibility of key optical and electrical parameters, which simplifies diagnostics and helps maintain link performance. The small form-factor pluggable design ensures compatibility with a wide range of SFP ports and allows easy replacement or upgrade without disrupting existing installations.

Suitable for

• Fiber uplinks between switches and routers in campus and office networks
• Interbuilding connections up to 2 km on single‑mode fiber
• Data center server-to-switch or switch-to-switch links requiring 1.25Gbps
• ISP edge links and aggregation points where DOM monitoring is needed
• Security and monitoring systems transmitting video or telemetry over fiber

Key specifications

• Data rate: up to 1.25 Gb/s (1250 Mb/s)
• Fiber type: single‑mode
• Wavelength: 1310 nm
• Maximum reach: up to 2 km
• Connector: LC/UPC
• Monitoring: Digital Optical Monitoring (DOM) for temperature, Vcc, laser bias current, Tx/Rx power
• Form factor: SFP (Small Form‑factor Pluggable)

How to use

Install the Extralink SFP module into an available SFP port on a compatible switch, router, or transceiver chassis while the host device is powered according to the vendor’s instructions. Connect single‑mode fiber using an LC/UPC patch cable, ensuring proper endface cleanliness and correct polarity. After insertion, verify link status on the host device and configure any required interface parameters. Use management interfaces or network management systems to access DOM data for ongoing monitoring and troubleshooting.

Recommendations

For reliable operation, use single‑mode fiber certified for 1310 nm and maintain clean connectors to minimize loss. Monitor DOM values regularly to detect early signs of degradation (such as falling Tx power or rising temperature) and keep firmware on network devices up to date for best compatibility.