Fiber Optic Transceiver CBO S-31DLC20D 1.25 Gbps Singlemode 20 km 1310 nm

CBO S-31DLC20D 1.25 Gbps Singlemode 20 km 1310 nm is a fiber optic SFP transceiver designed for use in standard SFP slots. Compatible with MikroTik systems and other devices that accept standard SFP modules, this module provides a 1.25 Gbps data rate over singlemode fiber links up to 20 km. It transmits at a 1310 nm wavelength and is intended for network uplinks, long-distance connections, and interconnection of switches, routers and telecom equipment.

Advantages

The transceiver supports a 1.25 Gbps transfer rate and singlemode fiber operation, enabling stable long-distance links without intermediate signal conversion. Its 1310 nm operating wavelength is suitable for metro and enterprise backbone connections. Designed to fit in standard SFP ports, the module simplifies upgrades and replacements in existing network hardware. The compact SFP form factor and vendor compatibility reduce the need for custom cabling or adapters.

Suitable for

• Switch-to-switch uplinks across campus or metro networks
• Router-to-switch connections for branch or headquarters links
• Telecom and ISP access links over singlemode fiber
• Point-to-point fiber links requiring up to 20 km reach

Key specifications

• Form factor: SFP (Small Form-factor Pluggable)
• Data rate: 1.25 Gbps (gigabit Ethernet/SDH/SONET compatible)
• Fiber type: Singlemode
• Maximum range: up to 20 km over singlemode fiber
• Wavelength: 1310 nm
• Connector type: LC duplex (industry standard)
• Hot-pluggable SFP design for easy installation and replacement

How to use

Insert the SFP transceiver into an available SFP port on a compatible switch, router or transceiver cage until it clicks into place. Connect singlemode LC duplex fiber patch cords to the transceiver ports, ensuring correct Tx/Rx orientation. Verify link status via device indicators or management interfaces and configure interface settings on the host device as required (speed, duplex, and optical diagnostics if supported). For fiber runs approaching the specified maximum distance, confirm optical power budget and link quality using appropriate test equipment.

Usage recommendations

Use singlemode LC duplex fiber with appropriate cleaning procedures to avoid contamination of optical interfaces. Prioritize correct polarity, check link LEDs after insertion, and monitor device logs for any optical alarms. For guaranteed performance, follow network device compatibility notes and optical power budget calculations when planning links near the 20 km limit.