100G QSFP28 DAC 3M Passive Twinax Cable - Low-Latency 100Gbps

In this review of the 100G QSFP28 DAC 3M passive twinax cable, the bottom line is simple: this cable is for networking engineers and data center technicians who need a reliable, low-latency 100Gbps link for short runs. The reviewer found the cable to be straightforward to deploy, fully passive and power-efficient, and broadly compatible with equipment that supports QSFP-100G-CU3M style DACs. It is especially useful where minimal insertion loss and near-zero added latency matter, and the cable arrives tested and ready to use with no additional software required.

Key Features

• 100Gbps performance: Provides a full 100G data rate for high-bandwidth server and switch interconnects without active electronics.
• Passive twinax design: Being passive keeps power consumption below 0.2W and reduces thermal and power requirements in dense racks.
• 3 meter length: The 3m (approximately 10ft) reach fits common top-of-rack to adjacent-rack connections in data centers and lab racks.
• Tested reliability: Each cable is TDR and VNA tested and individually checked on switches before shipping, which reduces the risk of early failures.
• Plug-and-play: Hot-pluggable QSFP28 to QSFP28 connectors require no drivers or software, speeding installation and swaps during maintenance.
• Durable finish: Gold-plated plugs and a PVC OFNR jacket provide repeated mating reliability and standard flame rating for rack environments.

Who It's For

The cable is best for network administrators and data center operators who need an economical, low-power 100G link for short distances between switches, top-of-rack equipment, or NICs that accept QSFP28 DACs. It is also suited to lab environments where repeatable, tested cabling helps validate setups quickly.

It is less appropriate for long-distance fiber runs or for environments requiring active optical modules; if you need runs beyond a few meters or optical isolation, look at fiber transceivers instead.

Pros & Cons

Pros

• High throughput at 100Gbps with very low latency, ideal for short interconnects.
• Passive construction keeps power consumption under 0.2W, reducing heat and power load.
• Each cable is individually TDR and VNA tested and validated on switches, improving out-of-box reliability.
• Plug-and-play QSFP28 connectors make deployment quick with no drivers required.

Cons

• Passive twinax is limited to short distances; it is not a replacement for fiber over longer runs.
• PVC OFNR jacket is standard for rack use but may not suit specialized outdoor or harsh-environment installations.

Specifications

Max Data Rate	100Gbps
Connector Type	QSFP28 to QSFP28
Cable Length	3m (10ft)
Wire AWG	30AWG
Jacket Material	PVC (OFNR)
Power Consumption	<0.2W
Operating Temperature	0 to 70C (32 to 158F)

Our Verdict

The 100G QSFP28 3m passive twinax cable is a practical, cost-effective solution for short-distance 100Gbps links where low latency and low power draw are priorities. Because it ships tested and is plug-and-play, it offers good out-of-box reliability and value for rack-level interconnects; teams needing longer runs or optical isolation should select fiber alternatives.

Frequently Asked Questions

Will this cable work with Cisco QSFP-100G-CU3M equipment?
Yes, the cable is designed to be widely compatible with Cisco QSFP-100G-CU3M style ports and similar QSFP28 slots that support passive DACs.

Does this cable require any drivers or external power?
No, it is passive and hot-pluggable so no drivers or extra power are required beyond the device ports.

What environments is this cable intended for?
It is intended for short rack and data center interconnects within the specified 3m length and standard indoor rack environments using a PVC OFNR jacket.