100G QSFP28 to 4×25G SFP28 Direct Attach Copper Cable (DAC), Passive, up to 5 m (16 ft)

Overview

The NSComm 100G QSFP28 to 4×25G SFP28 Direct Attach Copper Cable (DAC) is a high-density breakout copper solution for short-distance 100G to 4×25G Ethernet connections.

Featuring one QSFP28 connector on one end and four SFP28 connectors on the other, it enables 100G-to-25G port breakout for server uplinks, switch-to-switch connections, or aggregation nodes in top-of-rack (ToR) and middle-of-row (MoR) architectures.

Constructed with twinax copper cable, this DAC ensures ultra-low latency and eliminates the need for costly optical transceivers and fiber patch cords. The passive version supports up to 5 m (16 ft) with near-zero power consumption, while active DACs extend reach up to 7 m (23 ft) at < 1.5 W per end.

Compatible Brands

The NSComm 100G QSFP28 to 4×25G SFP28 DAC is compatible with equipment from Cisco, Huawei, Juniper, Arista, Dell, Extreme, and more.

Need assistance verifying compatibility with your device? [Contact Us Now] and our team will help.

Key Specifications

Specification	Details
Vendor Name	NSComm
Product Type	100G QSFP28 to 4×25G SFP28 Direct Attach Copper Cable (DAC)
Data Rate	100 Gbps (4×25 Gbps breakout)
Cable Type	Twinax Copper, Passive/Active
Max Cable Distance	Passive: up to 5 m (16 ft); Active: up to 7 m (23 ft)
Conductor AWG Options	30 AWG (≤ 2 m), 26 AWG (≤ 3–5 m), 24 AWG (≤ 7 m active)
Connector Type	1× QSFP28 to 4× SFP28
Power Consumption	Passive ≈ 0 W, Active ≤ 1.5 W
Temperature Range	0 °C to 70 °C
Standards Compliance	QSFP28 MSA (SFF-8665), SFP28 MSA (SFF-8402/8432), IEEE 802.3by/bj, RoHS
Applications	100G-to-25G breakout, server uplinks, switch aggregation, NIC-to-switch

Why Choose NSComm 100G Breakout DAC?

Breakout efficiency: Connects one 100G port to four 25G ports.
Ultra-low latency: Direct copper electrical path.
Energy efficient: Passive design consumes virtually no power.
Cost-optimized: Eliminates need for optical modules and fibers.
Interoperability: Tested across major switch and server vendors.

Length Options

Standard stocked lengths:
1 m (3 ft), 2 m (7 ft), 3 m (10 ft), 5 m (16 ft)

Extended (active) lengths:
7 m (23 ft)

More Details

Quality Certifications

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Warranty

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Item conditions are "New Sealed". They are fully tested by Certified CCIE / HCIE / RCNP Engineers.

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Standard Warranty Policy

Original New Sealed Enterprise Hardware: 3 Years
Original New Sealed Consumer Devices: 1 Year

The Support Contacts

If your NSComm products failed, you must contact your sales representative to verify product failure. If the problem still can't correct by remote support methods i.e. email or phone support, the RMA procedure will issue.

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