TL-SM321B | TP-Link Omada 1000Base-BX WDM Bi-Directional SFP Module – 10km LC Simplex Transceiver

The TP-Link TL-SM321B is a cost-effective Gigabit SFP module that utilizes WDM Bi-Directional (BX) technology to transmit and receive data using just a single strand of single-mode fiber. Designed as the complementary pair to the TL-SM321A, the SM321B transmits at 1310nm and receives at 1550nm, supporting reliable full-duplex communication over distances up to 10km.

This hot-swappable SFP module is fully compatible with the SFP Multi-Source Agreement (SFP-MSA) and supports IEEE 802.3z standards, making it ideal for use in Omada switches and routers as well as other MSA-compliant networking equipment. With low power consumption and high reliability, the SM321B is a great choice for long-distance, single-fiber deployments.

What’s in the Box

• TP-Link TL-SM321B WDM Bi-Directional SFP Module

• Installation Guide

Main Features

✅ Single-Fiber Transmission via WDM Bi-Directional technology (TX: 1310nm / RX: 1550nm)
✅ Up to 10km transmission range using 9/125 μm single-mode fiber
✅ 1.25 Gbps Gigabit data rate – ideal for high-speed fiber uplinks
✅ LC/UPC Simplex connector – space-saving and cost-efficient
✅ Hot-swappable for quick module upgrades without system downtime
✅ Compliant with IEEE 802.3z, CSMA/CD, and SFP-MSA
✅ Low power consumption (3.3V) ensures efficient operation

Detailed Specifications

Data Rate

• 1.25 Gbps

Wavelength

• TX: 1310nm

• RX: 1550nm

Fiber Type

• 9/125 μm Single-Mode Fiber

Maximum Cable Distance

• 10 km

Connector Type

• LC Simplex (UPC)

Power Supply

• 3.3V

Form Factor

• SFP

Hot Swappable

• Yes

Standards & Protocols

• IEEE 802.3z

• CSMA/CD

• TCP/IP

• SFP-MSA Compliant

Certifications

• FCC, CE

Environmental Specifications

• Operating Temperature: 0°C to 70°C (32°F to 158°F)

• Storage Temperature: -40°C to 80°C (-40°F to 176°F)

• Operating Humidity: 10% to 90% RH, non-condensing

• Storage Humidity: 5% to 90% RH, non-condensing

Warranty Information

Manufactures warrenty applied .

Brand Description

TP-Link Omada delivers enterprise-grade networking products trusted across industries. The SM321B module is part of TP-Link’s advanced fiber optic lineup, offering dependable performance, industry-standard compatibility, and reduced infrastructure cost by enabling single-fiber deployments without sacrificing speed or reliability.

SKU

TL-SM321B

Practical Use Scenarios

🏫 Inter-Building Fiber Links – Easily connect two remote buildings using a single-fiber uplink
📹 CCTV and IP Surveillance Systems – Power long-distance connections to camera networks
🌉 Smart City Networks – Optimize fiber use for large-scale infrastructure
🔄 Paired Use with TL-SM321A – Enables full-duplex transmission over a single optical strand

Datasheets / Downloadable Resources

📄TL-SM321B datasheet

Excellence for the Australian and New Zealand Market

The TL-SM321B is designed and distributed specifically for the Australia and New Zealand market, adhering to FCC and CE certifications for safe, interference-free operation. It is exclusively sourced through authorized ANZ distributors, with full local warranty handling and compliance support. Whether you’re upgrading enterprise backbones or deploying in smart infrastructure, the TL-SM321B guarantees dependability, efficiency, and region-optimized performance.

 FAQs

Q1. What is the fiber type required for the TL-SM321B? (TL-SM321B)
The TL-SM321B uses 9/125 μm single-mode fiber and features an LC simplex connector.

Q2. Can the TL-SM321B be paired with the TL-SM321A module? (TL-SM321B)
Yes, TL-SM321B is designed to work as the B-end of a WDM Bi-Directional pair with TL-SM321A, enabling bidirectional communication over a single fiber.

Q3. What is the maximum transmission distance of the TL-SM321B? (TL-SM321B)
The module supports up to 10km transmission distance over single-mode fiber.

Q4. Is the TL-SM321B hot-swappable? (TL-SM321B)
Yes, the TL-SM321B is hot-pluggable, allowing replacement or installation without rebooting the system.

Q5. Is the TL-SM321B compatible with other brands of switches? (TL-SM321B)
The TL-SM321B is SFP-MSA compliant, making it compatible with most SFP-capable switches that follow standard specifications.