What is a Loopback Transceiver ?

What is a Loopback Transceiver ?

If you ever wondered how to test the ports of your switches or serves, the answer is using a loopback transceiver ! It’s the simplest way and most low cost solution on the market for port testing.


The best solution for testing switches and servers ports is the passive electrical loopback transceiver. The loopback transceiver works by simulating the communication between two devices by transmitting the data (output) and receiving it (input).

Loopback transceivers perfectly replicate the performance  of typical of a 10G SFP+, 40G QSFP+, 25G SFP28 and 100G QSFP28 connections between equipped adapter cards, blade servers, routers, and switches. Even if they are able to duplicate the operational characteristics of typical transceivers, they do not contain the expensive components found in transceivers, such as the chips or laser diodes. That is why the cost of loopback transceivers is so low.

Optech Technology Loopback Transceivers

Optech‘s Loopback Transceivers serie includes, 10G SFP+ Loopback, 40G QSFP+ Loopback, 25G SFP28 Loopback and 100G QSFP28 Loopback.

10G SFP+ Loopback Transceiver for SFP+ port testing

10G SFP+ Loopback transceiver

25G SFP28 Loopback Transceiver for SFP28 port testing

25G SFP28 Loopback Transceiver

40G QSFP+ Loopback Transceivers for QSFP+ port testing

40G QSFP+ Loopback

100G QSFP28 Loopback Transceivers for QSFP28 port testing

100G QSFP28 Loopback transceiver


Our Loopback Transceivers are cost effective and high quality solutions to test transceivers ports. Customized signal attenuation and power are available upon request.

Technology Optech Part Number Features
10G SFP+ Loopack Transceiver  OPSFPP-T-00-PX 0 Dbm
25G SFP28 Loopack Transceiver  OPSF28-T-00-PX  0 Dbm
40G QSFP+ Loopack Transceiver  OPQSFP-T-00-PX  0 Dbm
100G SFP28 Loopack Transceiver  OPQS28-T-00-PX  0 Dbm

For more technical information about transceivers click here.

About Optech

Optech is a leading company in developing and manufacturing Optical Transceivers and Cables solutions for Data Center and Telecom market. Since 2001, Optech has been offering accurate lead time and high quality products to customers.

Optech offers a broad range of networking and communication solutions in following categories: Optical Transceivers, SFP, 10G SFP+, 25G SFP28, 40G QSFP+, 100G QSFP28 , Direct Attach Cables (DAC), Active Optical Cables (AOC), Ethernet Media Converter, Fiber Optical Patchcord, BWDM, CWDM, DWDM Mux/Demux and Repeater products.

For more information you can visit www.optech.com.tw or contact us at sales@optech.com.tw.

0 replies

Leave a Reply

Want to join the discussion?
Feel free to contribute!

Leave a Reply

Your email address will not be published. Required fields are marked *