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
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
Wavelength
Fiber Type
Maximum Cable Distance
Connector Type
Power Supply
Form Factor
Hot Swappable
Standards & Protocols
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IEEE 802.3z
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CSMA/CD
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TCP/IP
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SFP-MSA Compliant
Certifications
Environmental Specifications
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Operating Temperature: 0°C to 70°C (32°F to 158°F)
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Storage Temperature: -40°C to 80°C (-40°F to 176°F)
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Operating Humidity: 10% to 90% RH, non-condensing
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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.
