Tp-link Usa Corporation SM321B 1000BASE-BX Sfp Module

Product Description

The TP-LINK USA CORPORATION SM321B is a 1000BASE-BX WDM bidirectional SFP transceiver module designed for Gigabit Ethernet fiber network applications. It uses wavelength-division multiplexing (WDM) technology to transmit and receive data over a single strand of single-mode fiber, eliminating the need for a fiber pair. This module is installed by network technicians and IT infrastructure professionals in environments where fiber port density or cable runs make single-fiber operation practical and cost-effective.

The SM321B is suited for enterprise, commercial, and light industrial network deployments where Gigabit fiber uplinks are required. It fits into any standard SFP slot and supports 1000BASE-BX operation over single-mode fiber. Typical install scenarios include switch-to-switch uplinks, server room backbone runs, and building-to-building fiber connections where single-fiber cabling infrastructure is already in place.

Key Features

• 1000BASE-BX standard for Gigabit Ethernet over single-mode fiber
• WDM bidirectional design uses a single fiber strand for both transmit and receive
• Standard SFP form factor for broad switch and router compatibility
• Sold as a single unit (each)

Compatibility

Designed as an OEM-style SFP transceiver for use in standard SFP-slot-equipped Gigabit Ethernet switches, routers, and media converters supporting 1000BASE-BX single-mode fiber.

Installation Notes

Installation is performed by qualified network technicians following applicable data cabling and equipment standards. Power down or hot-swap according to the host device manufacturer guidelines before inserting or removing the SFP module. Clean fiber end-faces before mating connectors to prevent signal loss. Do not expose the optical ports to direct light or dust when the module is not connected.