100G QSFP28 DAC Cable CR4 QSFP28 to QSFP28 Passive 3M - Reliable

In this review of the 100G QSFP28 DAC Cable CR4, the bottom line is straightforward: this passive QSFP28-to-QSFP28 twinax cable is aimed at network engineers and data center operators who need a cost-effective, short-reach way to link 100G ports. The cable's single biggest reason to buy is compatibility and quality control - it is built to match Juniper 100G switches and every unit is TDR and VNA tested plus individually validated on switches before shipment, so it removes much of the uncertainty common with generic DACs.

Key Features

• 100GBASE-CR4 compatibility: Provides a straightforward 100-Gigabit copper link between QSFP28 ports for connections within racks and to adjacent racks.
• Juniper compatible: Designed to be 100% compatible with Juniper 100G Ethernet switches and to replace common factory 3m DAC part numbers for easy swaps.
• Passive twinax construction: Requires no additional power, offering a low-cost, low-complexity solution for very short links in dense rack environments.
• Tested for signal integrity: Each cable passes Time Domain Reflectometry (TDR) and Vector Network Analyzer (VNA) tests in the vendor lab to ensure reliable performance.
• Individual switch validation: Every DAC cable is tested on switches before delivery, reducing the risk of deployment issues in production networks.
• Aftercare: Ships with a 30-day free return window, five-year warranty, and lifetime technical support for peace of mind.

Who It's For

The cable is best for data center technicians, network administrators, and systems integrators who need a dependable, short-length 100G copper interconnect that is known to work with Juniper equipment. It is ideal for top-of-rack and adjacent-rack links where optical solutions would be overkill and where cost and power savings matter.

It is less suitable for long-reach connections or situations that require active optical cables; buyers needing runs beyond a few meters or fiber-based flexibility should look at active optical or modular transceiver options instead.

Pros & Cons

Pros

• Direct compatibility with Juniper 100G switches simplifies deployment and replacements.
• Individual TDR and VNA testing plus switch validation reduces the chance of DOA units.
• Passive design means no extra power draw and lower cost compared with active optical cables.

Cons

• Limited to short links; not suitable for runs longer than a few meters.

Specifications

Product type	Passive QSFP28 to QSFP28 twinax cable (DAC)
Speed	100Gb/s (100GBASE-CR4)
Length	3 meter (9.9 ft)
Wire gauge	AWG30
Compatibility	Compatible with Juniper 100G Ethernet switches, replacement for common 3m DAC parts
Testing	TDR & VNA tested; each cable validated on switches
Warranty	30-day free return, 5-year warranty, lifetime tech support

Our Verdict

For short-reach 100G interconnects inside racks or between adjacent racks, this QSFP28 passive DAC is a pragmatic, value-oriented choice because it pairs broad Juniper compatibility with lab-grade testing and per-unit validation. Organizations that prioritize predictable, low-cost connectivity and vendor-grade assurance will find it a sensible buy.

Frequently Asked Questions

Is this cable compatible with Juniper 100G switches?
Yes, it is built to be 100% compatible with Juniper 100G Ethernet switches and intended as a replacement for common 3m DAC parts.

How far can this passive DAC run reliably?
It is designed for very short links; the 3-meter length is suitable for within-rack and adjacent-rack connections but not for longer-distance runs.

What kind of testing and warranty is included?
Each cable undergoes TDR and VNA lab testing and is individually tested on switches; it ships with a 30-day return window, five-year warranty, and lifetime technical support.