StarTech.com LOOPBACKPLUG100G network cable tester Fibre tester

Perform loopback testing and verify signal continuity on QSFP28 connections and port interfaces

This QSFP28 loopback module is designed for testing 100G ports on switches, NICs, and other QSFP28-equipped devices. It supports passive electrical loopback to verify signal continuity, link stability, and port behavior without the need for active optics.

Test 100G QSFP28 Connections

The QSFP28 loopback adapter emulates 4-lane electrical testing for QSFP28 ports operating at 100 Gbps and is compatible with 40GBASE and 100GBASE Ethernet. It is MSA compliant and meets IEEE 802.3 requirements for reliable performance and universal compatibility.

Precise Signal Diagnostics

Perform electrical loopback testing for comprehensive 100G link verification. Ensure consistent signaling with 100 Ω 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 in-line port testing. Compact and low-power, it is an essential tool for network technicians and IT professionals in data centers and edge or on-premise facilities.

StarTech 100G Passive QSFP28 Loopback Adapter Module - Port Tester - 100G MSA QSFP Loopback Connector

• Reliable QSFP Testing: Create a loopback test connection with this passive electrical QSFP28 loopback module - Plugs directly into QSFP28 ports to test signal continuity and verify link integrity
• Precise Test Performance: 28 Gbps per lane across four lanes with 100 Ω impedance for stable signal reflection - Low jitter and consistent lane performance ensure reliable test results
• Built to Last: Optimized for multiple test cycles with a compact and low-power design - Complies with IEEE 802.3 requirements and MSA standards to ensure universal compatibility and performance
• Field-Ready Design: For technicians performing port-level diagnostics and hardware validation - Quickly confirm QSFP28 port behavior during maintenance or troubleshooting - No optical transceiver required
• The IT Pro's Choice: Our network tools and testers undergo rigorous testing in our innovation lab to ensure enterprise-grade reliability