BLACK BOX 

BLACK BOX QSFP-H40G-CU3M-BB 3M QSFP+ 40G DIRECT ATTACHED CABLE

Mfg Part Number:  QSFP-H40G-CU3M-BB  
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Price: $89.99 + Free Shipping
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In Stock: 4
Last Updated: Aug 03, 2025
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Cisco-Compatible Direct Attach Cable (DAC) Connects Network Equipment at Speeds up to 40 Gbps

Black Box QSFP+ Direct Attach Cables provide premium, error-free performance for data, storage, and high-performance computing (HPC) interconnectivity. They are 100% compatible with Cisco QSFP-H40G-CUxM=, allowing you to easily make connections amongst your Cisco switches, routers, and servers. Constructed for full compliance with the Multi-Source Agreement (MSA) and SFF-8436 industry standards, you can also make connections amongst your non-Cisco, 40-Gbps compatible networking equipment. Programmed, tested, and serialized to ensure compliance and functionality, Black Box Direct Attach Cables are the ideal solution for 40-Gbps Ethernet, fiber channel applications, and more.

Low-Cost, Low-Power Solution Ideal for In-Rack High-Density, High-Bandwidth Applications

When it comes to connecting networking equipment in high-density, high-bandwidth applications, Direct Attach Cables that operate over passive copper are the most cost-effective solution available. They are perfect for inter-rack connections of switches, routers, and servers. Further, DACs consume practically zero power, making them a much more efficient and economical connectivity solution than Active Optical Cables (AOC) and modular transceivers.

All-in-One Solution Makes for Simple Connections with Low Latency

With an all-in-one, hot-swappable cable design, Direct Attach Cables provide you with an easy-to-connect solution that doesn't require you to purchase multiple transceivers and cabling. The lack of additional connection points also means lower latency, so you can be confident of your data integrity. Hot-swappability makes upgrades and equipment replacements a breeze, minimizing downtime to your network connectivity.

Cross Reference Chart

Black Box Item # Cisco Comparable Item #
QSFP-H40G-CU50CM-BB QSFP-H40G-CU50CM=
QSFP-H40G-CU1M-BB QSFP-H40G-CU1M=
QSFP-H40G-CU2M-BB QSFP-H40G-CU2M=
QSFP-H40G-CU3M-BB QSFP-H40G-CU3M=
QSFP-H40G-CU5M-BB QSFP-H40G-CU5M=
Main Specification
General Information
Manufacturer Black Box Corporation
Manufacturer Part Number QSFP-H40G-CU3M-BB
Manufacturer Website Address http://www.blackbox.com
Brand Name Black Box
Product Name QSFP+ Network Cable
Product Type Network Cable
Technical Information
Cable Type QSFP+
Cable Length 9.80 ft
Connector Type on First End QSFP+ Network - Male
Connector on First End Details 1 x QSFP+ Network - Male
Connector Type on Second End QSFP+ Network - Male
Connector on Second End Details 1 x QSFP+ Network - Male
Jacket Type CL2
Device Supported Router
Device Supported Switch
Device Supported Network Device
Device Supported Server
Data Transfer Rate 40 Gbit/s
Features Hot-swappable
Physical Characteristics
Product Color Black
Jacket Material Polyvinyl Chloride (PVC)
Miscellaneous
Environmentally Friendly Yes
Country of Origin China
Warranty
Limited Warranty Lifetime
WARNING:: The plastic used in cable products can expose you to lead and lead components, chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information go to www.P65Warnings.ca.gov
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