'QSFP+ TO QSFP+'}
Cisco QSFP-H40G-CU3M New Optics WhaleyComm
Cisco

Cisco QSFP-H40G-CU3M 40GBASE-CR4 QSFP Passive Direct Attach Copper Cable 3M

MPN: QSFP-H40G-CU3M
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$35.00
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Every WhaleyComm unit is professionally tested, reset to factory defaults, and certified by our in-house engineers — the same standard trusted by 5,000+ organisations across 25 years. Not a refurb marketplace. A certified lifecycle partner.

Tested to factory specification. Backed by 25 years of enterprise trust.

The Cisco QSFP-H40G-CU3M is a high-performance 40GBASE-CR4 QSFP+ Passive Direct Attach Copper (DAC) cable designed for short-range, high-speed 40 Gigabit Ethernet connectivity. With a 3-meter reach, this passive DAC cable delivers reliable, low-latency interconnects between top-of-rack switches, routers, and servers — making it an ideal solution for modern data center environments, high-density deployments, and enterprise core networking.

As a genuine Cisco optics accessory (MPN: QSFP-H40G-CU3M), this cable is fully compatible with Cisco Nexus, Catalyst, and other QSFP+-enabled platforms, ensuring seamless integration and plug-and-play simplicity without the need for additional transceivers or power-hungry active components.

Product Highlights

  • Vendor: Cisco
  • MPN: QSFP-H40G-CU3M
  • Product Type: Optics / Direct Attach Copper (DAC) Cable
  • Condition: New
  • Form Factor: QSFP+ (Quad Small Form-Factor Pluggable)
  • Speed: 40GBASE-CR4 (40 Gigabit Ethernet)
  • Cable Type: Passive DAC (Direct Attach Copper)
  • Cable Length: 3 Meters
  • Interface: QSFP+ to QSFP+
  • Low power consumption — no active electronics required
  • Plug-and-play compatibility with Cisco QSFP+-enabled platforms
  • Fully compliant with IEEE 802.3ba 40GbE standards

Compatible Platforms (Partial List)

  • Cisco Nexus 3000, 5000, 6000, 7000, 9000 Series
  • Cisco Catalyst 6500 / 6800 Series
  • Cisco ASR Routers with QSFP+ line cards
  • Any IEEE 802.3ba-compliant QSFP+ device

Whether you're building out a new data center fabric, upgrading your spine-leaf architecture, or simply replacing a failed cable, the Cisco QSFP-H40G-CU3M from WhaleyComm delivers the performance, reliability, and value your network demands. Order today and experience the WhaleyComm difference.

Technical Specifications
{'Manufacturer Part Number'
'QSFP-H40G-CU3M', 'Brand': 'Cisco', 'Product Type': 'Optics / Direct Attach Copper (DAC) Cable', 'Condition': 'New', 'Vendor': 'Cisco', 'MPN': 'QSFP-H40G-CU3M', 'Form Factor': 'QSFP+ (Quad Small Form-Factor Pluggable)', 'Speed': '40GBASE-CR4 (40 Gigabit Ethernet)', 'Cable Type': 'Passive DAC (Direct Attach Copper)', 'Cable Length': '3 Meters', 'Interface': 'QSFP+ to QSFP+'}
Ideal Use Cases
Inter-Switch Links and Uplinks
Optical transceivers enable high-speed connections between switches, servers, and storage devices where copper is insufficient for the required distance or bandwidth.
Data Center Backbone
Ideal for backbone links between core, distribution, and access switches in data center and campus environments at significant savings versus OEM pricing.
What's Included
✔ Cisco QSFP-H40G-CU3M New Optical Transceiver (1x)
✔ Protective dust caps installed
✔ WhaleyComm ISO 9001-certified inspection and testing certificate
✔ WhaleyComm Lifetime Warranty
Lifetime Warranty — No Time Limits. No Questions.
Every WhaleyComm unit ships with a Lifetime Warranty. If it fails under normal operating conditions at any point, we replace it. No time limits, no expiration, no hidden conditions. Backed by 25 years and 5,000+ satisfied customers.
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Compatibility Details
Review supported optics, cables, software, management protocols, and environment-specific compatibility guidance.
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Platform Compatibility

  • Cisco Switches: Catalyst 3750X, 3850, 4500, 6500, 6800, 9300, 9400, 9500 and Nexus 3000, 5000, 7000, 9000 Series with matching optical slots
  • Cisco Routers: ASR 1000, ISR 4000 Series with matching module slots
  • Fiber: Verify single-mode (SMF) or multimode (MMF) per transceiver model
  • Note: Verify compatibility with target IOS/NX-OS software release before deployment
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Shipping & Returns
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Shipping
Orders ship within 1-2 business days from our facility in Texas. Overnight and expedited shipping available at checkout.
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Returns
Contact our support team for any DOA or warranty issues. Every WhaleyComm unit is covered by a Lifetime Warranty — we make it right, fast.
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Contact
+1 214 607-4800 | Mon-Fri 8am-6pm CST
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Frequently Asked Questions
Product-specific answers about compatibility, testing, warranty, fulfilment, and purchase confidence.
This unit is sold as New and has never been deployed. It ships in original or equivalent packaging with a WhaleyComm Lifetime Warranty.
Yes. Every WhaleyComm unit ships with a Lifetime Warranty — no time limits, no questions asked. If your Cisco QSFP-H40G-CU3M fails under normal operating conditions at any point, we replace it at no cost.
Every unit WhaleyComm ships undergoes an ISO 9001-certified testing process: full power-on diagnostics, port-by-port functionality testing, firmware verification, factory reset, and final inspection. Backed by 25 years of experience and 5,000+ enterprise customers.
Cisco QSFP-H40G-CU3M 40GBASE-CR4 QSFP Passive Direct Attach Copper Cable 3M
$35.00
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