SFP transceiver module BlueOptics TN-SFP-LXB21T-BO Fiber optic 20000 m

The BlueOptics TN-SFP-LXB21T-BO is a compact SFP fiber optic transceiver module designed for single-mode links up to 20,000 m. It implements a 1000BASE-BX-U configuration with LC simplex connector, pairing a 1550 nm transmitter and a 1310 nm receiver for bi-directional transmission over a single fiber. Housed in aluminium and weighing approximately 20 g, the module follows MSA mechanical form-factor standards and is intended for use in network equipment that supports SFP 1000BASE-BX-U modules.

Advantages

The module provides long-reach single-mode connectivity with up to 20 km transmission range, low weight and an aluminium housing for mechanical stability. It supports standardized SFP interfaces and LC simplex connectors for broad compatibility with switches, routers and other optical devices. The transceiver offers digital diagnostics (DDM/DOM) capability for monitoring supply voltage, laser bias, transmit and receive power and temperature when the host hardware supports these functions.

Suitable for

• Long-distance Ethernet links in campus and metropolitan networks
• Point-to-point fiber connections between sites up to 20 km apart
• Integration into switches, routers, storage systems and media converters with SFP ports
• Environments requiring optical isolation from electromagnetic interference

Key specifications

• Interface type: SFP (MSA compliant)
• Data rate: 1.25 Gbps (1000BASE-BX-U)
• Optical fiber type: Single-mode fiber (SMF)
• Tx wavelength: 1550 nm
• Rx wavelength: 1310 nm
• Connector: LC simplex
• Maximum link distance: 20,000 m (20 km)
• Housing material: Aluminium
• Weight: approx. 0.02 kg
• Digital diagnostics: DDM/DOM support (if supported by host)

How to use

Install the transceiver into a compatible SFP slot on your switch, router or media converter until it clicks into place, following the host device manufacturer’s insertion instructions. Connect an appropriate single-mode LC simplex patch cord to the module and to the remote transceiver or patch panel. Ensure correct fiber polarity for bi-directional BX operation (transmit and receive wavelengths are different) and verify link status through the host equipment. If available and enabled by the host, use the DDM/DOM interface to monitor operational parameters such as optical power and temperature.

Recommendations

Handle the optical interfaces with dust caps when not in use, avoid bending single-mode fiber beyond its minimum bend radius, and verify that the host device supports 1000BASE-BX-U and DDM if you intend to use diagnostic functions. For optimal performance, use high-quality single-mode patch cords and ensure connectors are clean before mating.