100Gb/s QSFP28 DAC Cable 2m - Passive 100GbE Direct Attach

In this review of the 100Gb/s QSFP28 DAC Cable 2m, the bottom line is simple: network engineers and data center technicians who need a reliable, low-latency direct attach copper link for short runs will find a dependable option here. The cable is targeted at setups that require 100GbE connectivity between compatible QSFP28 ports and the single biggest reason to buy is its combination of lab-tested signal integrity and vendor compatibility, which reduces risk when deploying high-speed connections.

Key Features

• 100Gb/s QSFP28 Passive Copper: Provides a cost-effective short-reach 100GbE link without active components, keeping power and complexity low.
• 2-Meter Length: Offers a practical distance for adjacent racks or within-rack interconnects while avoiding excess slack in cable runs.
• 30AWG Construction: Delivers a balance of flexibility and conductor performance that is common for DACs in modern gear.
• Tested Signal Integrity: Each cable passed TDR and VNA testing in 10Gtek's Signal Integrity Lab, reducing the chance of link problems.
• Individual Switch Testing: Every unit is tested on switches before delivery, which helps ensure out-of-box compatibility with supported hardware.
• Compatibility with Mellanox ETH MCP1600-C002E30N: Explicit compatibility information makes it easier to choose the right DAC for Mellanox-based environments.

Who It's For

This cable is aimed at IT professionals running 100GbE infrastructures who want a simple, passive copper option for short-distance links. It suits connections between switches, top-of-rack ports, and high-performance servers where a direct, low-latency connection is preferred over optical transceivers.

Users who need longer runs, hot-pluggable optical flexibility, or active signal conditioning should look elsewhere; for those needs, optical modules and fiber cabling remain better choices despite higher component cost.

Pros & Cons

Pros

• Reliable passive 100GbE connectivity that works with Mellanox and other compatible devices according to customer reports.
• Laboratory TDR and VNA testing plus individual switch testing reduce deployment risk.
• Reasonable 2m length for rack-to-rack and within-rack links without excessive cable management issues.
• Low power profile as a passive DAC compared with active optical alternatives.

Cons

• Limited to short-reach applications; not suitable for longer data center spans where fiber is required.
• Passive copper cannot match the reach or flexibility of some active optics in mixed environments.

Specifications

Our Verdict

The 100Gb/s QSFP28 2m passive DAC is a practical, cost-effective choice for short-distance 100GbE links where compatibility and tested signal integrity matter. Network teams that run Mellanox or similar QSFP28 systems will appreciate the lab and switch testing that reduce deployment headaches, making it a good value for rack-level interconnects.

Frequently Asked Questions

Is this cable compatible with Mellanox switches?
Yes, it is explicitly compatible with Mellanox ETH MCP1600-C002E30N and is reported to work with other Mellanox devices in customer feedback.

Can this replace optical transceivers for all 100GbE runs?
No, passive DACs are best for short-reach connections; optical transceivers and fiber are better for longer distances or when optical reach is required.

Has this cable been tested for signal quality?
Yes, each cable passed TDR and VNA testing in 10Gtek's Signal Integrity Lab and is individually tested on switches before delivery.