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header-product TP-Link ISM321B-20 Industrial SFP Fiber Optic Transceiver Module, 1250 Mbit/s, WDM, 20km
20.49 €

TP-Link ISM321B-20 Industrial SFP Fiber Optic Transceiver Module, 1250 Mbit/s, WDM, 20km

TP-Link ISM321B-20 Industrial SFP Fiber Optic Transceiver Photo 1
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TP-Link ISM321B-20 Industrial SFP Fiber Optic Transceiver Module, 1250 Mbit/s, WDM, 20km

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Short description

The TP-Link ISM321B-20 is an industrial-grade SFP fiber optic transceiver module designed for reliable network connectivity. It supports data transfer rates up to 1250 Mbit/s and utilizes WDM technology for bidirectional communication over a single fiber strand up to 20 km. Featuring a wide operating temperature range and IEEE 802.3z compliance, this module is ideal for demanding industrial networking environments requiring stable, high-speed data transmission.
Available at price 20.49 €: 7 pcs.
Total available for order: 77 pcs.
Warranty: 5 Years
SKU: 11545913
free shipment

Cheapest delivery:

Venipak Pickup LV, Venipak Locker LV

Pick-up points

Venipak Pickup LV

Venipak Locker LV

Cost

1.89 €

Deliver

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Customer service center
2b. Kengaraga str., Riga, Latvia, LV-1063
Wednesday {{selectedOffer.officeDeliveryString}}
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Courier Delivery Please note that in case of a large parcel additional delivery costs may apply!
13.07.2026 {{selectedOffer.courierDeliveryString}}
From 4.99 € (Weight: 0.07 kg)
Parcel couriers
Venipak Pickup LV / Venipak Locker LV / Latvijas Pasts pakomāts / Unisend LV / DPD Paku skapis / Omniva LV / Latvijas Pasts nodaļa
13.07.2026 {{selectedOffer.parcelStationDeliveryString}}
From 1.89 €
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Product information

Description

The TP-Link ISM321B-20 is an industrial-grade SFP fiber optic transceiver module engineered for high-performance network connectivity in challenging environments. This module supports data transfer rates of up to 1250 Mbit/s and utilizes WDM technology to enable bidirectional communication over a single strand of single-mode fiber. With a robust design capable of operating in extreme temperatures ranging from -40°C to 85°C, it ensures stable and reliable data transmission for critical infrastructure.

Advantages

This transceiver module offers significant benefits for industrial networking, primarily through its WDM technology which optimizes fiber usage by allowing data to be sent and received on a single strand. The industrial-grade build quality ensures consistent performance in harsh conditions where standard commercial equipment might fail. Furthermore, the support for DDM (Digital Diagnostics Monitoring) allows network administrators to monitor real-time parameters, facilitating proactive maintenance and troubleshooting. Its hot-swappable design enables easy installation and replacement without the need to power down the network switch, minimizing downtime.

Suitable for

  • Industrial automation and control systems
  • Long-distance data transmission in outdoor or harsh environments
  • Expanding network reach up to 20 km
  • Upgrading existing fiber networks to Gigabit speeds

When it may not be suitable

This module is specifically designed for single-mode fiber applications and will not function with multi-mode fiber cabling. It is also not intended for standard office environments where industrial-grade temperature resistance and ruggedization are not required, as more cost-effective commercial-grade alternatives may be available.

Key specifications

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

How to use

To install the TP-Link ISM321B-20, ensure your network switch or device is powered on and supports SFP modules. Carefully insert the module into the SFP slot until it clicks into place. Connect the appropriate single-mode fiber optic cable with an LC connector to the module. The device should automatically detect the module, allowing for immediate data transmission. If the link does not establish, verify that the fiber cable is clean and properly seated, and ensure that the paired device at the other end of the link is compatible with the WDM wavelength specifications.

What to consider before purchase

  • Verify that your network switch or router has an available SFP port.
  • Ensure the fiber infrastructure is single-mode.
  • Confirm that the paired transceiver at the other end of the link matches the WDM wavelength requirements.
  • Check the physical space requirements to ensure the module fits within your existing enclosure.

Usage recommendations

For optimal performance and longevity, always handle the fiber optic connectors with care to prevent dust or debris from entering the optical path. Use protective caps when the module is not connected to a cable.

Specifications

Product colour:
Grey
Networking standards:
IEEE 802.3z
All features
Interface type:
SFP
Hot-swap:
Yes
Maximum transfer distance:
20000 m
Fiber cable diameters supported (core/cladding):
9/125
SFP transceiver type:
Fiber optic
Single-mode fiber (SMF) supported:
Yes

Operational conditions

Operating relative humidity (H-H):
5 - 85
Storage temperature (T-T):
-40 - 85
Storage relative humidity (H-H):
5 - 85

Performance

Maximum data transfer rate:
1250 Mbit/s

Certificates

Certification:
FCC, CE

Power

Input voltage:
3.3

Logistics data

Quantity per pack:
1 pc(s)

Weight & dimensions

Height:
10.97 mm
Width:
56.4 mm
Depth:
13.4 mm

Technical details

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

Design

Product colour:
Grey

Network

Networking standards:
IEEE 802.3z

Other features

Ethernet interface type:
1.25 Gigabit Ethernet

Ports & interfaces

Fiber optic connector:
LC (UPC)

Description

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Stock data
Warehouse Stock Delivery to the store Store Price
EU2 7 Wednesday Best delivery 20.49 € Best price
WH353 7 21.07.2026 26.99 €
WH115 2 17.07.2026 27.99 €
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Available only for legal entities
Warehouse Stock Delivery to the store Store Price
WH109 30 31.07.2026 37.99 €
20.49 €
Stock: 7
Delivery Date: Wednesday Best delivery
Warehouse: EU2
26.99 €
Stock: 7
Delivery Date: 21.07.2026
Warehouse: WH353
27.99 €
Stock: 2
Delivery Date: 17.07.2026
Warehouse: WH115
28.49 €
Stock: 1
Delivery Date: 17.07.2026
Warehouse: EU85
36.49 €
Stock: 30
Delivery Date: 17.07.2026
Warehouse: WH94
Available only for legal entities
37.99 €
Stock: 30
Delivery Date: 31.07.2026
Warehouse: WH109

Customer reviews

Customer questions

FAQ

How much does the TP-Link ISM321B-20 Industrial SFP Fiber Optic Transceiver cost, and is it available for purchase?

The price is 20.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 77 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 Wednesday 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: product colour, 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 ISM321B-20 Industrial SFP Fiber Optic Transceiver?

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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14-Day Return Policy We are confident in our quality, but if the purchase doesn’t fit — you have 14 days to return the product with peace of mind.
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