The TP-Link SM321A is a high-performance 1000Base-BX WDM bi-directional Small Form-factor Pluggable (SFP) optical transceiver designed for single-mode fiber networks. It enables bidirectional communication over a single strand of fiber, transmitting at 1550 nm and receiving at 1310 nm with a data rate of 1.25 Gbps. Equipped with an LC/UPC connector, it supports transmission distances up to 10 km, making it ideal for extending network links in enterprise or service provider environments.

This module is fully compliant with the SFP Multi-Source Agreement (SFP-MSA) standard and features Digital Diagnostic Monitoring (DDM) to provide real-time information on operating parameters such as optical power and temperature. The hot-swappable design allows for easy installation and maintenance without powering down the equipment.

Powered by a 3.3 V supply and carrying FCC and CE certifications, the SM321A ensures reliability and regulatory compliance. Ideal for use with TP-Link routers, switches, and media converters, this module provides a cost-effective and efficient solution for network extension using single-mode fiber infrastructure. The product includes the SFP module and an installation guide, backed by a limited 3-year warranty.

Key Benefits:

• Enables bidirectional data transmission over a single fiber strand


• Supports long-distance connections up to 10 km


• Digital Diagnostic Monitoring for enhanced network management


• Hot-swappable for minimal downtime


• Compliant with industry standards ensuring broad compatibility