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header-product TP-Link ISM321A-20 Industrial SFP Fiber Optic Transceiver Module, 1250 Mbit/s, WDM, 20km
13.99 €

TP-Link ISM321A-20 Industrial SFP Fiber Optic Transceiver Module, 1250 Mbit/s, WDM, 20km

TP-Link ISM321A-20 SFP Fiber Optic Transceiver Module Photo 1
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TP-Link ISM321A-20 Industrial SFP Fiber Optic Transceiver Module, 1250 Mbit/s, WDM, 20km

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TP-Link ISM321A-20 Industrial SFP Fiber Optic Transceiver Module, 1250 Mbit/s, WDM, 20km

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Short description

The TP-Link ISM321A-20 is an industrial-grade SFP fiber optic transceiver module designed for high-speed network connectivity. It supports a maximum data transfer rate of 1250 Mbit/s and utilizes WDM technology for bidirectional communication over a single fiber strand up to 20km. Compliant with IEEE 802.3z standards, this module is built for reliable performance in demanding environments with an operating temperature range of -40°C to 85°C.
Available at price 13.99 €: 4 pcs.
Total available for order: 57 pcs.
Warranty: 2 Years
SKU: 11545912
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Cheapest delivery:

Unisend LV

Pick-up points

Unisend LV

Cost

1.99 €

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2b. Kengaraga str., Riga, Latvia, LV-1063
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29.10.2026 {{selectedOffer.courierDeliveryString}}
From 4.99 € (Weight: 0.07 kg)
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Product information

Description

The TP-Link ISM321A-20 is an industrial-grade SFP fiber optic transceiver module engineered for high-performance network connectivity in challenging environments. It supports data transfer rates of up to 1250 Mbit/s and utilizes WDM technology to enable bidirectional communication over a single fiber strand, effectively doubling the capacity of existing fiber infrastructure. Designed for reliability, this module ensures stable operation across a wide temperature range, making it an ideal choice for industrial networking applications.

Advantages

This transceiver module offers exceptional durability, featuring an industrial operating temperature range from -40°C to 85°C, which allows it to function reliably in extreme conditions where standard commercial equipment might fail. The integration of WDM technology simplifies cabling by requiring only a single fiber strand for bidirectional data transmission, reducing installation complexity and costs. Furthermore, the support for DDM (Digital Diagnostic Monitoring) provides real-time insights into the module's performance, enabling proactive maintenance and troubleshooting to ensure maximum network uptime.

Suitable for

  • Industrial automation and control systems
  • Long-distance network backhaul in harsh environments
  • Expanding network capacity over existing single-mode fiber
  • Outdoor surveillance and security infrastructure

This module may not be suitable for short-range indoor office environments where standard commercial-grade transceivers are sufficient and more cost-effective. Additionally, it is not compatible with multi-mode fiber optic cabling, as it is specifically designed for single-mode fiber applications.

Key specifications

  • Data transfer rate: 1250 Mbit/s
  • Interface: SFP with LC connector
  • Technology: WDM (Bi-Directional)
  • Fiber type: Single-mode
  • Maximum distance: 20 km
  • Operating temperature: -40°C to 85°C
  • Input voltage: 3.3 V
  • Standards: IEEE 802.3z

To use the TP-Link ISM321A-20, simply insert the module into a compatible SFP slot on your network switch or industrial gateway. The device is hot-swappable, meaning it can be installed or replaced without powering down the host equipment. Once inserted, connect the appropriate single-mode fiber optic cable to the LC port. The system should automatically detect the module, though you may need to configure the port settings in your network management interface to match the link speed and duplex requirements.

What to consider before purchase

  • Ensure your network switch or device supports SFP modules with 1.25 Gbps speeds.
  • Verify that your fiber optic infrastructure uses single-mode cabling.
  • Confirm that the WDM wavelength requirements match your existing network setup.
  • Check the physical space constraints of your equipment to ensure the module fits correctly.

Usage recommendations

For optimal performance and longevity, ensure that the fiber optic connectors are clean and free of dust before insertion. Avoid bending the fiber optic cable beyond its minimum bend radius to prevent signal loss or physical damage to the glass core.

Specifications

Networking standards: The way in which the network is working, e.g. IEEE 802.11a, IEEE 802.11b, IEEE 802.11g.
IEEE 802.3z
All features
Interface type:
SFP
Hot-swap:
Yes
Maximum transfer distance: The greatest distance over which the data/signal can be transferred.
20000 m
Fiber cable diameters supported (core/cladding):
9/125
SFP transceiver type:
Fiber optic
Single-mode fiber (SMF) supported:
Yes

Certificates

Certification:
FCC, CE

Technical details

Maximum operating temperature:
85 °C
Minimum operating temperature:
-40 °C

Weight & dimensions

Height: The measurement of the product from head to foot or from base to top.
10.97 mm
Depth: The distance from the front to the back of something.
13.4 mm
Width: The measurement or extent of something from side to side.
56.4 mm

Operational conditions

Storage relative humidity (H-H):
5 - 85
Operating relative humidity (H-H):
5 - 85
Storage temperature (T-T): The minimum and maximum temperatures at which the product can be safely stored.
-40 - 85

Other features

Ethernet interface type:
1.25 Gigabit Ethernet

Power

Input voltage: The voltage (V) which is required to power the product.
3.3

Performance

Maximum data transfer rate: The maximum speed with which data can be transmitted from one device to another.
1250 Mbit/s

Design

Product colour: The colour e.g. red, blue, green, black, white.
Grey

Network

Networking standards: The way in which the network is working, e.g. IEEE 802.11a, IEEE 802.11b, IEEE 802.11g.
IEEE 802.3z

Ports & interfaces

Fiber optic connector: This terminates the end of an optical fiber, and enables quicker connection and disconnection than splicing. The connectors mechanically couple and align the cores of fibers so light can pass. Better connectors lose very little light due to reflection or misalignment of the fibers. In all there have been about 100 types of optic fiber connectors produced.
LC (UPC)

Description

Machine translation.

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Product comparison

TheTP-Link ISM321A-20 Industrial SFP Fiber Optic Transceiver Module, 1250 Mbit/s, WDM, 20km is compared with the alternativeTP-Link ISM321B-20 Industrial SFP Fiber Optic Transceiver Module, 1250 Mbit/s, WDM, 20km. Both products are industrial-grade SFP fiber optic transceiver modules from the same manufacturer, engineered for high-speed network connectivity in demanding environments. The primary distinction lies in their WDM wavelength configuration, as these specific A and B variants are designed to operate as a matched pair for bidirectional communication over a single fiber strand.

⚙️ The specifications comparison table below evaluates key characteristics such as data transfer rates, maximum reach, networking standards, and underlying technologies to help understand their operational relationship.

Comparison parameterTP-Link ISM321A-20TP-Link ISM321B-20Practical significance
Data transfer rate1250 Mbit/s1250 Mbit/sBoth modules deliver identical gigabit-class performance for demanding networks.
Maximum distanceUp to 20 kmUp to 20 kmProvide the exact same single-fiber transmission reach.
WDM technologyYes (single fiber)Yes (single fiber)Designed to work in pairs (A and B) for bidirectional data streams.
Networking standardsIEEE 802.3zIEEE 802.3zEnsures full compliance with standard network infrastructure.

◎ The suitability table below outlines which product fits specific deployment scenarios and user needs.

Use caseRecommended productWhy
Deploying a connection at one end of a WDM linkTP-Link ISM321A-20Used at the local end of a single-fiber link in conjunction with a B-type module.
Deploying a connection at the opposite end of a WDM linkTP-Link ISM321B-20Serves as the necessary companion module to the A-type unit at the remote end.
Choosing between theTP-Link ISM321A-20 and theTP-Link ISM321B-20 depends entirely on your network architecture requirements and whether you need a matched pair. Because both units share identical performance metrics, data rates, and operational ranges, the ISM321A-20 is best suited for deployment on one side of a WDM link when paired with the ISM321B-20 at the opposite end.
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Stock data
Warehouse Stock Delivery to the store Store Price
EU2 4 Monday Best delivery
Discount 46%
13.99 € Best price
WH115 1 04.11.2026
27.99 €
WH353 2 04.11.2026
30.49 €
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Available only for legal entities
Warehouse Stock Delivery to the store Store Price
WH109 25 19.11.2026
39.49 €
Discount 46%
13.99 €
Stock: 4
Delivery Date: Monday Best delivery
Warehouse: EU2
27.99 €
Stock: 1
Delivery Date: 04.11.2026
Warehouse: WH115
30.49 €
Stock: 2
Delivery Date: 04.11.2026
Warehouse: WH353
41.49 €
Stock: 25
Delivery Date: 04.11.2026
Warehouse: WH94
Available only for legal entities
39.49 €
Stock: 25
Delivery Date: 19.11.2026
Warehouse: WH109

Customer reviews

Customer questions

FAQ

How much does the TP-Link ISM321A-20 SFP Fiber Optic Transceiver Module cost, and is it available for purchase?

The price is 13.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 57 pcs. are in stock, and you can place your purchase right now with delivery across Latvia and Europe or choose pickup at the Riga collection point. We offer favorable purchase terms, including the option to split the payment into convenient monthly installments. Availability and price are updated in real time, so we recommend placing your order in advance.

If I order this product today, when will I receive my order?

If you place your order today, delivery will be as fast and convenient as possible. You will be able to pick up your order on Monday at the Riga pickup point or choose delivery across Latvia and Europe. We carefully inspect every purchase and pack it securely for safe transportation.

What payment options are available?

AiO.lv offers several payment methods: Bank transfer, Bank cards on-line, Apple Pay, Google Pay. All transactions are 100% secure and encrypted.

Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

What is the warranty period?

All TP-LINK products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized TP-LINK service centers and through AiO.lv

Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. We will assist with consultation, warranty claim processing, and coordination with certified service centers.

How can I tell if this product suits my needs?

When making a choice, we recommend paying attention to the key features: networking standards, compatibility with your devices or usage conditions, material quality, functionality, and warranty terms. These characteristics will help you determine how well the model meets your needs.

Where can I download the instructions for TP-Link ISM321A-20 SFP Fiber Optic Transceiver Module?

You can download the instructions in PDF format from the “Instructions” section on the product description page. The file contains complete information about installation, setup, and usage.
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