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40G QSFP+ Loopback, 0~5 dBm, 0~2.5 W

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40G QSFP+ Loopback, 0~5 dBm, 0~2.5 W


Availability: In stock

Volume Price: Inquire
  • Model: CAB-QSFP-LB
● 100Mbps to 40Gbps
● 0~5 dBm (Attenuation Option)
● For Switch, NIC self-testing
● 0~2.5 W (Power Consumption Option)
● Warranty:  500 times Cycles

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Product Description Shipping & Payment Customer Reviews


The 40G QSFP+ Loopback is used for testing QSFP+ transceiverports in host/system boards. By substituting a full-featured QSFP+ transceiver, the electrical loopback provides a cost effective method for QSFP+ port testing. The CAB-QSFP-LBxx is packaged in an MSA compliant housing offering excellent heatdissipation, compatible with all QSFP+ ports. These electrical loopback have "Attenuation" and "Power Consumption" option, application in R&D validation, production testing and field analysis.
  • QSFP+ MSA Compliant
  • Hot-pluggable MSA footprint
  • MSA compliant EEPROM
  • Case Temperature range from 0° to 80°C
  • 0~5 dBm (Attenuation Option)
  • 0~2.5 W (Power Consumption Option)
  • MSA compliant EEPROM
  • Board and System Level Testing
  • Test and Measurement
  • Switch and Router Chamber Testing
  • 100Mbps to 40Gbps
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 />SFPcables.com 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 SFPcables.com 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 SFPcables.com)

DAC Cables (Passive) 3-Year Warranty
DAC Cables (Active) 3-Year Warranty
AOC Cable 3-Year Warranty
Fiber Optic Transceivers 3-Year Warranty (1G, 10G)
1.5-Year Warranty (25G, 40G, 100G, 200G)
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 SFPcables.com 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 SFPcables.com sales representative before Returns.
  4. Return process is not done based on SFPcables.com 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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40G QSFP+ Loopback, 0~5 dBm, 0~2.5 W

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Free shipping on orders over $300.