The TP-Link TL-SM321B-2 is a high-performance 1000Base-BX Wavelength Division Multiplexing (WDM) bi-directional Small Form Pluggable (SFP) transceiver designed to enable gigabit fiber communication over a single strand of single-mode fiber. Operating at wavelengths of 1310nm for transmission and 1550nm for reception, this module supports reliable data transmissions up to 2 kilometers on 9/125 µm single-mode fiber (SMF), making it ideal for short to medium distance fiber optic deployments.

Compliant with IEEE 802.3z and SFP-MSA (Small Form Pluggable Multi-Source Agreement) standards, this module ensures interoperability across a wide range of network equipment including switches, routers, servers, and media converters. It supports Digital Diagnostic Monitoring (DDM) compatible with SFF-8472 standard, enabling real-time status monitoring of optical power, temperature, and supply voltage for improved network management.

Its hot-swappable design allows easy installation and replacement without powering down the host device, facilitating minimal downtime during maintenance. The LC simplex connector delivers a compact and efficient optical interface. With a low power requirement of 3.3V and certifications including FCC and CE, the TL-SM321B-2 is built for dependable performance in commercial environments operating within the temperature range of 0–70°C.

Package includes: the TL-SM321B-2 SFP module and installation guide. For full-duplex communication over a single fiber, use in tandem with the TL-SM321A-2 module.

Key benefits include seamless integration for gigabit fiber networks, robust diagnostics support, and easy management features, suited for businesses seeking cost-effective and scalable fiber connectivity solutions.