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StarTech.com

StarTech QSFP28 Loopback Module, 100G Passive QSFP28 Loopback Adapter, QSFP Port Tester, 100G QSFP Loopback Test Plug - MSA Compliant

$81.99
$72.35 SAVE $9.64
193 availableas of 09/11/2026

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Should arrive by Thu, Oct 1 with free ground shipping

Compliance and certifications

  • TAA compliant
  • WEEE
  • RoHS
Rated excellent by our customers Read our reviews

Secure checkoutISO 9001:2015 and CMMC certifiedFamily owned since 1982

Free shipping on most items when you spend $100 or more.

Real people answer: chat with us, email customerservice@colamco.com, or call 1-800-692-8757, Monday to Friday, 8am to 5pm EST.

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Secure checkoutISO 9001:2015 and CMMC certifiedFamily owned since 1982

Free shipping on most items when you spend $100 or more.

Real people answer: chat with us, email customerservice@colamco.com, or call 1-800-692-8757, Monday to Friday, 8am to 5pm EST.

Overview

This QSFP28 Loopback Module is designed for testing 100G ports in switches, NICs, and other QSFP28-equipped devices. It supports passive electrical loopback for verifying signal continuity, link stability, and port behavior without requiring active optics.

Test 100G QSFP28 Connections

The QSFP28 Loopback Adapter emulates 4-lane electrical testing for QSFP28 ports operating at 100Gbps, and supports 40GBASE and 100GBASE Ethernet. It is MSA compliant and meets IEEE 802.3 requirements for reliable performance and universal compatibility.

Accurate Signal Diagnostics

Perform electrical loopback testing for full 100G link verification. Ensure consistent signaling with 100Ω impedance and low jitter for stable, repeatable test results under real-world conditions.

For Enterprise Network Switches

Connect directly to QSFP28 ports on switches, routers, and NICs for inline port testing. Compact and low-power, it is an essential tool for network technicians and IT pros in data centers and edge or on-prem installations.

Technical specifications

General Information

Manufacturer StarTech.com
Manufacturer Part Number LOOPBACKPLUG100G
Manufacturer Website Address http://www.startech.com
Brand Name StarTech.com
Product Name QSFP28 Module
Packaged Quantity 1 Box
Product Type QSFP28

Technical Information

Application / Usage Data NetworkingOptical Network

Interfaces/Ports

Total Number of Ports 1
Interfaces / Ports Details 1 x 100GBase-X Network

Media & Performance

Media Type Supported Optical Fiber
Ethernet Technology 100 Gigabit Ethernet
Network Technology 100GBase-X
Maximum Data Transfer Rate 100 Gbit/s

Environmental Conditions

Minimum Operating Temperature -40°F (-40°C)
Maximum Operating Temperature 167°F (75°C)

Physical Characteristics

Color Family Silver
Product Color Silver
Product Material PlasticMetal
Height 0.5"
Width 0.7"
Weight (Approximate) 0.08 lb
Length 5"

Miscellaneous

Compatibility

MSA Compliant

TAA Compliant Yes
Environmental Compliance Waste Electrical and Electronic Equipment Directive (WEEE)Restriction of Hazardous Substances (RoHS)

Warranty

Limited Warranty 2 Year

Ratings and reviews

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Shipping and returns

Free shipping on most items when you spend $100 or more. In-stock items ship on the next open shipment slot. The buy box above shows the live order-by countdown and the estimated arrival date.

Need to send it back? Start a return online with a Request RMA and our team will take care of you. Keep the original packaging. Items must be returned in the condition received.

Questions about shipping or returns? Chat with us, email customerservice@colamco.com, or call 1-800-692-8757, Monday to Friday, 8am to 5pm EST.