SKU: 28923022257

Lenovo 5M Passive QSFP28 to 4xSFP28 DAC

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Description

Lenovo 5M Passive QSFP28 to 4xSFP28 DACMeet the Lenovo 5M Passive QSFP28 to 4xSFP28 DAC, a high performance breakout cable that delivers reliable, low latency connectivity between data center switches, servers, and storage devices. Designed for modern Lenovo networking environments and compatible with a broad range of QSFP28 SFP28 ports, this 5 meter copper DAC offers a streamlined, cost effective path to consolidating multiple 25G links into a single high speed 100G connection. With its

Meet the Lenovo 5M Passive QSFP28 to 4xSFP28 DAC, a high-performance breakout cable that delivers reliable, low-latency connectivity between data-center switches, servers, and storage devices. Designed for modern Lenovo networking environments and compatible with a broad range of QSFP28/SFP28 ports, this 5-meter copper DAC offers a streamlined, cost-effective path to consolidating multiple 25G links into a single high-speed 100G connection. With its passive design, plug-and-play simplicity, and rugged build, it’s an ideal choice for data centers, rack installations, and enterprise networks seeking deterministic performance without the need for external power or active components.

  • Breakout efficiency for modern data centers: Converts a single QSFP28 port into four independent SFP28 lanes, enabling flexible aggregation of 25G links to reach total aggregate bandwidth of up to 100G where supported by your hardware.
  • 5-meter (16.40 ft) length for versatile deployments: The length provides ample reach for cable management in dense racks, Top-of-Rack deployments, and multi-device connections, while preserving tight timing and signal integrity.
  • Passive copper design for cost and power efficiency: No external power or active components are required, delivering a straightforward, low-cost, energy-efficient solution with reliable performance at short to moderate distances.
  • Plug-and-play compatibility with Lenovo and standard QSFP28/SFP28 ports: Ideal for Lenovo servers, switches, and storage arrays, while also compatible with other vendors’ devices that support QSFP28 breakout to SFP28 lanes, simplifying integration across mixed vendors.
  • Low-latency, deterministic data transfer for critical workloads: Engineered to minimize latency and jitter, supporting high-demand applications such as HPC, virtualization, and dense compute clusters where consistent throughput matters.

Technical Details of Lenovo 5M Passive QSFP28 to 4xSFP28 DAC

  • Length: 5 meters (16.40 feet)
  • Cable type: Passive QSFP28 to 4×SFP28 DAC
  • End configuration: 1× QSFP28 on one end; 4× SFP28 on the other end
  • Data rate (per lane): Up to 25 Gbps per SFP28 lane; up to 100 Gbps aggregate across all four lanes
  • Connector types: QSFP28 to four SFP28 connectors
  • Material and construction: Copper DAC with shielding designed for reliable signal integrity and EMI protection
  • Applications: Data centers, servers, switches, storage arrays requiring breakout connectivity
  • Compatibility: Optimized for Lenovo networking hardware and broadly compatible with other vendors that support QSFP28 to SFP28 breakout

How to install Lenovo 5M Passive QSFP28 to 4xSFP28 DAC

  • Verify port compatibility: Ensure the source device has a QSFP28 port and the destination devices offer SFP28 ports that support 25G links per lane. The setup should support breakout to four individual 25G links.
  • Power considerations: This is a passive copper cable and does not require power. You can perform hot-plug insertion on devices that support hot-swapping; consult your hardware manual for specific guidance.
  • Connect the QSFP28 end: Insert the QSFP28 connector firmly into the corresponding QSFP28 port on the source switch or server. You should hear or feel a secure click when seated properly.
  • Connect the SFP28 ends: Attach each of the four SFP28 connectors to their respective SFP28 ports on the target devices. Align connectors correctly and ensure all four links are fully seated.
  • Power on and verify: Power up the connected devices (if not already powered) and check the port status indicators. Confirm that all four SFP28 links come up and that there are stable, valid link lights and throughput on each lane. If any link fails, reseat connectors and verify port configurations in the switch/router settings.

Frequently asked questions

  • Q: What is the Lenovo 5M Passive QSFP28 to 4xSFP28 DAC best used for?
  • A: It is a breakout cable designed to convert one high-speed QSFP28 port into four 25G SFP28 links, enabling scalable, high-bandwidth connections between switches, servers, and storage in data centers or enterprise networks.
  • Q: Is this cable compatible with non-Lenovo hardware?
  • A: Yes. The cable is compatible with devices that support QSFP28 and SFP28 breakout configurations. It works with a wide range of networking gear that adheres to QSFP28/SFP28 standards, though always verify port readiness and speed settings in your device documentation.
  • Q: What is the maximum total bandwidth supported by this breakout?
  • A: When four 25G lanes are utilized, the aggregate bandwidth can reach up to 100 Gbps, depending on the capabilities and configuration of the connected hardware.
  • Q: Do I need any drivers or special software to use this DAC?
  • A: No. This is a passive copper DAC and operates as a plug-and-play breakout cable. Drivers are not required; performance is determined by the hardware’s port capabilities and configuration.
  • Q: Can I replace a single SFP28 end if one lane fails?
  • A: It depends on your hardware and cabling arrangement. In a four-lane breakout, typically you would replace or reseat the affected SFP28 module and ensure the corresponding link is properly configured on the switch or server. Always follow your vendor’s troubleshooting steps for link issues.
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SKU: 28923022257

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This book is good in that it comes with two practice tests: one in the beginning of the book, one in the end of the book. The grading rubric is helpful too. However, the actual guide part of the book, doesn't help too much with how to improve test scores. What I like least about this guide is that it won't tell you which questions you answered incorrectly on the practice exams. A good test prep guide will tell you what you answered incorrectly, and will tell you what logic to follow to get to the correct answer. In the reading passages, it would be nice to know where I can find evidence to justify the "correct" answer. In the grammar section, it would be nice to know which rule I'm violating. Any test guide should always come with some testing strategies. I.E. If this question is taking up too much time, skip it and go to the next one. This guide lacks simple strategies like that. Simple strategies like that could be useful when incorporated into this guide because there are certain sections on the exam that you can go back to previous questions, but some sections where the "back" button is disabled. Overall, if you've never seen an iTEP exam before, this book is certainly helpful in that it will give you an idea of what you will be testing for. However, this book alone won't help you achieve a score of 6. The table of contents itself will tell you there are only 86 pages of actual content covering test material. That's not enough to cover how to excel in the exam.
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