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Cisco QSFP-40G-SR4 40GBASE-SR4 QSFP+ Transceiver, New

$91.23 USD

Ready to ship  -  1 left

Warranty: Lifetime

Quick answer: The Cisco QSFP-40G-SR4 is a 40GBASE-SR4 QSFP+ optic that runs 40 Gigabit Ethernet over multimode fiber at 850 nm, up to 100 m on OM3 and 150 m on OM4, through a single MPO-12 connector. This listing is a genuine Cisco module. Resilient Tec sells it new, with a lifetime warranty and free US shipping from Knoxville, TN.

Condition: New

The Cisco QSFP-40G-SR4 is a hot-swappable, 40GBASE-SR4 QSFP+ transceiver designed for high-speed Ethernet connectivity over multimode fiber. Featuring an MPO connector, it supports 40 Gigabit Ethernet for high-density, short-range connections, making it ideal for data center spine-leaf architectures and aggregation links.

Key Specifications

  • Data Rate: 40Gbps (4x10Gbps lanes)

  • Interface: MPO-12 connector

  • Cable Type: Multimode fiber (MMF)

  • Wavelength: 850nm

  • Distance: Up to 100m on OM3 MMF, 150m on OM4 MMF

  • Power Consumption: 1.5W

  • Operating Temperature: Commercial range, 0°C to 70°C (32°F to 158°F)

  • Form Factor: QSFP+

  • Compatibility: Supports a wide range of Cisco switches and routers (e.g., Nexus 9000, Catalyst 9500 series)

  • Standards: IEEE 802.3ba, QSFP+ MSA, RoHS compliant

Frequently Asked Questions

What cable does it need?
A 12-fiber MPO trunk with flat (UPC) endfaces on multimode OM3 or OM4 fiber, female on both ends. Angle-polished (APC) MPO cables, such as those built for NVIDIA NDR optics, will not mate with it.

Can it break out to 4 x 10G?
Yes, on platforms that support breakout: with an MPO to 4 x duplex LC breakout cable, one QSFP-40G-SR4 can connect to four 10GBASE-SR SFP+ ports. Check that your switch port supports breakout mode.

Can I reuse my existing duplex LC fiber for 40G?
Not with SR4, which needs MPO. A BiDi optic such as the QSFP-40/100-SRBD runs over existing duplex LC multimode fiber.

What warranty and shipping come with it?
Resilient Tec's lifetime warranty. US standard shipping is free with no minimum, and orders typically arrive in 3 to 5 days.

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  • 5 stars: 2 (100%)
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Marco Vitali
Fantastic 10G SFP+ DAC for top-of-rack switching

We use short-run SFP+ DAC cables to connect servers to our top-of-rack switches and this Cisco-compatible 10G DAC is a perfect fit. Link came up instantly at 10G on both ends with zero configuration. Passive copper means no power draw or heat concerns. At this price it is a no-brainer for short server-to-switch runs. Ordered ten and all were perfect. Will reorder.

Thanks Marco! Ten for ten on passive DAC cables with instant link-up is exactly what we aim for. Great for bulk TOR deployments. Looking forward to your next order!

N
Nadia Petrov
Cisco 40G QSFP works perfectly with our Nexus fabric

Picked up a few of these Cisco QSFP 40G SR4 transceivers for our Nexus 9000 series switches and they came right up without any unsupported module warnings. Optical power readings are within spec and we have been running them 24/7 for two months without a single fault. Refurb condition was very clean. Great pricing from Resilient Tec.

Thanks Nadia! No unsupported module warnings on Nexus is always great news. Two months fault-free is exactly what we aim for. Appreciate you sharing the experience!