What does 1000Base-BX WDM mean, and why is it different?

WDM (wavelength-division multiplexing) allows this transceiver to send and receive data over a single fibre strand simultaneously, halving the fibre infrastructure cost compared to traditional two-fibre systems.

What range does this bi-directional transceiver support?

The TL-SM321B transmits up to 20 kilometres over a single 9/125 µm single-mode fibre, suitable for campus and metropolitan backbone links.

Which TP-Link equipment works with this module?

This SFP transceiver fits any TP-Link SFP-enabled switch or port; it is typically paired with the TL-SM321A for bi-directional communication.

When should we use 1000Base-BX instead of conventional multi-mode or dual-fibre single-mode links?

Use this module when distance exceeds 300 metres, you need to minimise fibre runs (by using a single strand), and cost efficiency is a priority for metro or inter-building links.

Is the TL-SM321A required to use this module?

Yes, this module must be paired with a compatible TL-SM321A transceiver at the remote end to establish a complete bi-directional link.

How do I handle and protect this transceiver?

Keep the LC connectors capped and the transceiver in a stable, dust-free environment; avoid exposing it to direct heat or moisture.

What is the expected delivery timeframe for this transceiver to my location in the GCC?

Availability and delivery times vary; contact Procure.ae to check current stock and obtain a delivery estimate for your site.

Does Procure.ae offer installation services for fibre transceivers?

Procure.ae is happy to advise on deployment requirements; reach out to discuss technical support and setup options for your network.

What does 1000Base-BX mean in technical terms?

1000Base-BX is a Gigabit Ethernet standard using bi-directional transmission over a single single-mode fibre strand via wavelength division.

What fibre type does this module use?

This module operates over 9/125 µm single-mode fibre only.

Must I order the TL-SM321A separately, or does it come included?

Contact Procure.ae to confirm whether the TL-SM321A transceiver is included in the package or must be ordered separately.

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TP-Link TL-SM321B 1000Base-BX SFP Module

TP-Link TL-SM321B 1000Base-BX SFP Module

Name: TP-Link TL-SM321B 1000Base-BX SFP Module
Brand: TP-Link
SKU: TL-SM321B

The TP-Link TL-SM321B is a 1000Base-BX WDM bi-directional SFP transceiver supporting up to 20 km transmission over a single 9/125 μm single-mode fibre strand. Paired with the TL-SM321A, it extends network links across campus or metropolitan distances.

Overview

The TP-Link TL-SM321B is a WDM (wavelength division multiplexing) SFP+ transceiver that enables bi-directional 1 Gbps communication over a single strand of single-mode fibre at 1310 nm. When paired with the TL-SM321A transmitting at 1550 nm, it provides cost-effective long-distance links reaching 20 km with minimal signal degradation.

Key Features

1000Base-BX standard for gigabit bi-directional transmission
Single fibre operation with WDM wavelength separation
Up to 20 km range with 9/125 μm single-mode fibre
Hot-swappable SFP form factor for flexible deployment
Digital diagnostic monitoring (DDM) for remote health checks
Compatible with TP-Link routers, switches, and media converters

Specifications

Standard: 1000Base-BX
Transmission Distance: Up to 20 km
Fibre Type: 9/125 μm single-mode
Wavelength: 1310 nm
Form Factor: SFP-MSA compliant
Color: Silver

Why buy from Procure.ae

Procure.ae supplies fibre optic networking modules to telecom operators, system integrators, and data centre teams across the UAE and GCC. Request a quote for competitive bulk pricing and expert configuration support.

FAQ

Do I need to purchase both TL-SM321A and TL-SM321B?
Yes, you need one of each to establish a bi-directional link; they operate on different wavelengths and are not interchangeable.

What is DDM and why is it useful?
Digital Diagnostic Monitoring allows remote monitoring of optical power levels, temperature, and transceiver status without physical access, enabling proactive maintenance.