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 QSFP28 to SFP28 Adapter, QSA adapter

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QSFP28 to SFP28 Adapter, QSA adapter

SKU: WADQS-28-B-100

Availability: In stock

Regular Price: $159.00

Special Price: $59.00

Volume Price: Inquire
● 100G QSFP28 to 25G SFP28 Adapter.
● Enabling 25GbE connectivity on 100GbE infrastructure.
● Trouble-free installation and network bring-up.
● Compliant to industry standards: QSFP28 MSA SFF-8665 and SFP28 MSA SFF-8402

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Regular Price: $159.00

Special Price: $59.00

Product Description Shipping & Payment Customer Reviews


10Gtek WADQS-28-B-100, the Quad to Single Small Form Factor Pluggable Adapter (100G QSFP28 to 25G SFP28 Adapter or QSA) is the world's first solution for the QSFP28 to SFP28 conversion challenge.
The QSA enables smooth, cost effective connections between a single lane transceiver/cable and a quad lane port. The QSA provides the option to connect an SFP28 transceiver or cable to a QSFP28 port of an Nx100 Gb/s switch or network card. It resolves the systems linking issues between different line rates and different form-factors used in switches and network adapters.

The QSA provides an integration solution for systems using different vendors equipment, the QSA is vendor agnostic and provides a direct path to the SFP module memory. The QSA interoperates with all major optical module and direct attached copper cables vendors. The QSA design assures minimum loss on the conversion path from the QSFP28 cage to the SFP28 receptacle. The QSA is qualified for 25GbE SFP28 transceivers meeting the Small Form Factor Pluggable (SFP28) Transceiver Multi-source Agreement (MSA).

• Secure latching mechanism

• RoHS compliant

• Low crosstalk

• Low insertion loss

• Operating case temperature: -20°C ~ +85°C

• Storage Temperature: -40°C ~ +125°C

• Supply Voltage: 3.15 ~ 3.45V


• Data Servers, Routers, Switches

• Networked storage systems

• Data Center networking

• InfiniBand Trade Association (IBTA)

• IEEE-802.3ba

Shipping Methods

Global Shipping

Together with SFPcables, there is a Global Delivery from us like no others. We will not only delivery the correct shipment, but also for more things for an efficient and flexible way of business cooperation with our partners.<br /> ship worldwide to nearly every country across the globe, covering North and South America, Europe, Asia, Africa, Oceania, and more. We employ the services of major, trusted international carriers to ensure your package arrives to your destination safely and securely.

38 Country Free shipping

Online orders exceed $300.00 to following countries can enjoy Free Shipping;
Asia: Philippines, South Korea, Singapore, Brunei, Taiwan, Malaysia, Thailand, Japan, Indonisia, Indonesia, Kampuchea, Laos, Vietnam
North America: United States, Canada, Mexico
Oceania: Australia, New Zealand
Eastern Europe: Bulgaria, Estonia, Latvia, Lithuania, Slovakia, Romania
Southern Europe: Slovenia, Greece, Spain, Portugal, San Marino, Italy
Central Europe: Slovenia, Germany, Poland, Czech, Slovakia, Hungary, Austria, Switzerland
Western Europe: Belgium, Britain, Ireland, Netherlands, Luxemburg, France
Northern Europe: Sweden, Denmark, Finland, Norway

Typically, we use DHL and UPS to deliver your goods. Shipping methods are not fixed, they may vary according to country location, order amount, customer requirements, etc.

Payment Methods

Payment methods available at include:

  • PayPal and PayPal Express
  • Bank to bank wire transfers (T/T)
  • Western Union
Warranty & Service

Warranty Policy:

Warranty Service Pack1*:     All 10Gtek's products share 1-year standard warranty.
Warranty Service Pack2*:     Enhanced Item (Apply to Online order at

DAC Cables (Passive) 3-Year Warranty
DAC Cables (Active) 3-Year Warranty
AOC Cable 3-Year Warranty
Fiber Optic Transceivers 3-Year Warranty
Switch, Convertors 1-Year Warranty
NIC/CNA Cards 1-Year Warranty
Optical System 1-Year Warranty
Patch Cords 3-Year Warranty
Power Adapter
0.5-Year Warranty
Consumer cable 3-Month

15-Day money back Guarantee

15-Day money back guarantee applies to all products sold by provided that the items are new, undamaged, unmodified and in good resalable condition. If you are not satisfied with the product, you can apply return within 15 days.
All freight charges, transaction costs (bank charge or Paypal cost, etc) are the responsibility of the customer.

Returns are not acceptable if:
  1. The products are proved to have been abused, misused, replaced, repaired, or modified.
  2. After 15 days of delivery, returns are not acceptable. If the items are still under warranty period, customer could ask for repair or replacement. 
  3. No Return agreement was reached with a sales representative before Returns.
  4. Return process is not done based on Return instructions.



The logos, products and/or company names referred to herein is for informational purposes only, merely indicating that 10Gtek’s products can be compatible with the mentioned products. The logo 10Gtek is a registered trademark of 10GTEK TRANSCEIVERS CO., LTD.

10GTEK TRANSCEIVERS CO., LTD. All Rights Reserved.


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QSFP28 to SFP28 Adapter, QSA adapter

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Free shipping on orders over $300.