Cisco 40GBASE-CSR QSFP Module for Duplex MMF
SKU: 31270158684

Cisco 40GBASE-CSR QSFP Module for Duplex MMF

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Description

Cisco 40GBASE-CSR QSFP Module for Duplex MMFCisco QSFP 40G CSR S: Duplex MMF 40GBASE QSFP+ Transceiver The Cisco QSFP 40G CSR S (S Class) is a high density, pluggable optical transceiver engineered for reliable 40 Gigabit Ethernet links over multimode fiber. This QSFP+ module features a duplex LC connector interface and is optimized for laser graded OM3 and OM4 multi mode fiber, delivering robust performance in modern data centers. With support for demanding uplink and inter switch connections,

Cisco QSFP-40G-CSR-S: Duplex MMF 40GBASE QSFP+ Transceiver

The Cisco QSFP-40G-CSR-S (S-Class) is a high-density, pluggable optical transceiver engineered for reliable 40 Gigabit Ethernet links over multimode fiber. This QSFP+ module features a duplex LC connector interface and is optimized for laser-graded OM3 and OM4 multi-mode fiber, delivering robust performance in modern data centers. With support for demanding uplink and inter-switch connections, the CSR-S is a trusted choice for spine-and-leaf deployments, cloud environments, and campus networks that require scalable, low-latency connectivity. Whether you’re upgrading a data center rack or expanding a campus network, the CSR-S helps maximize port density while maintaining Cisco-grade reliability and interoperability within Cisco ecosystems.

  • High-density 40GBASE-CSR-S transceiver for scalable data-center connectivity in a compact QSFP+ form factor. Optimized for dense switch-to-switch links, rack-space efficiency, and simplified cable management in modern networks. This module enables large-scale bandwidth without sacrificing port availability or space.
  • Duplex MMF LC interface with standard LC connectors supports straightforward, reliable fiber cabling. The duplex interface enables bi-directional 40G transmission over a single fiber pair, reducing patch panel complexity and enabling flexible fiber routing in crowded data-center environments.
  • OM3 and OM4 fiber compatibility with extended reach—up to 300 meters on laser-optimized OM3 and up to 400 meters on OM4. This makes the CSR-S suitable for a range of deployments, from intra-rack uplinks to cross-room connections, while preserving high signal integrity and margin over typical data-center fiber layouts.
  • QSFP+ S-Class compatibility—designed for Cisco systems to ensure seamless integration, predictable performance, and long-term reliability in enterprise and service-provider networks. Cisco-grade components and testing help reduce interoperability risk across Cisco switches, routers, and optics ecosystems.
  • Hot-swappable, plug-and-play operation—engineered for rapid deployment with minimal system downtime. The module supports straightforward hot-swapping in compatible Cisco devices, with clear optical and status indicators to help operators verify healthy links quickly during upgrades or maintenance windows.

Technical Details of Cisco QSFP-40G-CSR-S

  • Get this information from the "specifications" section of the product from https://ec.synnex.com/ using product "UPC" or "SKU" as reference

How to install Cisco QSFP-40G-CSR-S

  • Prepare the equipment — power down the device if required by your deployment protocol and ensure the target QSFP+ port is available for installation. Confirm compatibility with your Cisco switch or router model and verify that the module supports your intended fiber type and distance.
  • Insert the module — align the CSR-S with the QSFP+ port and insert firmly until it seats with an audible or tactile click. Confirm that the module is fully engaged and that the port LED indicators reflect normal activity after seating.
  • Connect the fiber — attach duplex multimode fiber to the LC connectors, ensuring the correct OM3 or OM4 fiber is used for the desired link distance. Use quality fiber patch cords and maintain proper bend radii to preserve optical performance.
  • Power on and verify — restore power and use your device’s CLI or GUI to verify the interface detects the transceiver. Commands such as show interface status or equivalent optics diagnostics can confirm the link is up and operating at 40G speeds.
  • Test the link — perform basic throughput and latency tests to validate the link under expected traffic conditions. Monitor the optics health and LED indicators over the initial hours of operation to ensure stable performance.

Frequently asked questions

  • What is the Cisco QSFP-40G-CSR-S? It is a 40GBASE CSR-S (short-reach) QSFP+ transceiver designed for duplex multimode fiber with an LC interface, specifically optimized for Cisco networking equipment and data-center environments.
  • What fiber types does it support? It supports laser-optimized multimode fiber (OM3 and OM4), enabling reliable 40G connections over these common data-center fiber types.
  • What link distances are supported? For OM3 fiber, up to 300 meters; for OM4 fiber, up to 400 meters, depending on link quality and optical budget.
  • Is it hot-swappable? Yes. The CSR-S is designed as a hot-swappable QSFP+ module, allowing deployment and upgrades without powering down the host equipment in compatible Cisco devices.
  • Is it compatible with non-Cisco devices? The module is designed for Cisco systems and is tested for Cisco interoperability. While some non-Cisco devices may recognize the module, full compatibility cannot be guaranteed across all vendors; always consult your vendor’s compatibility matrix before mixed-vendor deployments.
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SKU: 31270158684

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SAM
San Leandro, US
★★★★★ 5
Beyond worth it!
Color: Black
Before this, I used battery powered frothers and couldn’t keep up with replacing the batteries. As soon as the batteries began to lose their charge, the frothers weren’t powerful enough. Somehow, this doesn’t begin to lose its charge until the charge runs out. I’ve spent a fraction of the price buying this as I did on batteries. I got this in Aug 2024. It’s amazing and incredibly powerful. In a year, I charged it 3 times. If you don’t get the froth you’re looking for, I’d suggest you watch a video on how to froth correctly. I learned there’s a proper technique that really improves the outcome. It made a world of difference for me. The charge time advertised is not correct. It lasts much much much longer on one charge. After the charge died, I charged it for maybe an hour and then I used it to whisk thick body butter. When washing it, I got it too wet. The motor wouldn’t stop running, so I called it a loss and put it outside to let it run until it stopped. It ran for hours. Sometime during the night it shut off. The next day, I pressed the on button again and it ran the entire day. It has a warranty, but I never registered mine, so I don’t mind paying for a replacement since it is so inexpensive. I’m writing this review now because I liked it so much that I just purchased another one to replace it. I hope this helps. If you’re unsure: It is incredibly powerful, but has two speeds, so one will work for any frothing needs. The price is unbeatable, much less than you’ll spend on batteries. The charge lasts unbelievably long and stays just as powerful until the charge runs out. It is detachable, so washing it is really simple. Just wipe the top part.
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Reviewed in the United States on September 2, 2025
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Amazon Customer
Dallas, US
★★★★★ 4
Mostly good, with one design flaw - See Update - Five stars for new version!
Color: White
*I bumped my rating from 3 to 4 stars because of the customer service. The seller's response to customer reviews is excellent. This particular model (MF05) still gets 3 stars from me, but the new version (MF09) is definitely a 5 star product. See update below.* Second Update: I received the new version (FoodVille MF09), and really like it. It solves the variable speed problem. Three speeds are still available, however, each has its own on/off switch, so no more cycling through. It also comes with an additional hook attachment for mixing powders with liquid, as well as a charging stand. It is a few dollars more, but most definitely worth it! Buy the MF09 version, https://amazon.com/FoodVille-Rechargeable-Stainless-Cappuccino-Bulletproof/dp/B0872RLB4V/ref=sr_1_1?dchild=1&keywords=foodville+mf09&qid=1595520925&sr=8-1 I recommend buying from this seller (FoodVille). They are very attentive and customer oriented. I will be leaving a 5 star review for that frother! Update: FoodVille contacted me to let me know they have a new version of this frother that addresses the variable speed issue I've complained about. They are sending me the new frother, and I will post a review on the updated version soon. The new version is FoodVille MF09, so be sure to check it out as it sounds better than the MF05 I have purchased and reviewed here. In addition to fixing the speed issue, they have included a charging dock. I've had this frother for a few months now. Overall, it works as well as my Aerolatte hand-held that died. I like that it is rechargeable, since I went through quite a lot of batteries before. My problem with this is the way you have to cycle through the speeds, rather than just selecting the one you want. This is a problem because sometimes I'll need to stop it before I'm finished and then when I resume it is on the next faster speed, which causes the milk to fly out of the glass before I can get back to the lower setting. I have ruined at least one shirt with stains from the flying milk. Also, because of where the on/off button is, and because of its sensitivity, I sometimes turn it off accidentally, which of course causes the milk to slosh everywhere getting back to the lower setting. I really wish you could just pick a speed, even if that means just a high and a low. I'm thinking of going back to a single speed frother. All but the lowest speed seems to be too strong to froth milk anyway. So, it works, it has good battery life, but cycling through the speeds has been a problem for me. I'll keep using it for now, but may be in the market for something different soon.
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Reviewed in the United States on April 2, 2020
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Rocie O.
New York, US
★★★★★ 5
Perfect for home baristas
Color: White
I recently purchased this milk frother, and it has completely elevated my daily coffee routine. It’s incredibly easy to use—just pour in your milk, press a button, and within seconds you have perfectly smooth, creamy foam. Whether I’m making a latte, cappuccino, or even a matcha, the texture comes out consistently rich and velvety every time. What I love most is how quiet and fast it is compared to other frothers I’ve tried. It heats the milk evenly without burning it, and the foam holds its shape beautifully. Cleanup is also a breeze thanks to the non-stick interior—just a quick rinse and wipe, and it’s ready to go again. The design is sleek and compact, so it doesn’t take up much counter space, and it looks great next to my coffee setup. Overall, this frother delivers excellent performance, convenience, and quality. I’d highly recommend it to anyone who enjoys café-style drinks at home.
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Reviewed in the United States on March 19, 2026
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daniel g.
Lake Worth, US
★★★★★ 5
Best Frother in this Category!!!
Color: Black
This is by far the best frothers the money that I have purchased. It has two speeds, with the second being very powerful. These units charge quickly and they hold a charge for a long time. The attachments are sturdy and they do not warp and spin off-center like many others. I would also like to say that Foodville has a very generous warranty. I had one unit stop working after eight months and they replaced it promptly within two weeks.. I highly recommend!
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Reviewed in the United States on May 3, 2026
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Alexander
Pawtucket, US
★★★★★ 5
No Other Option Needed (and no batteries required!)
Color: Black, Color: Black
The price is good, it works great, the usb c charging is such a plus, I’d definitely recommend if someone needs a frother. The rechargeable feature is key for long term value. A more niche use case I have is using this to mix my protein mix powder with water on days I don’t want to make a whole smoothie. It’s easy and lets me silently, even at night when a blender would be too loud, mix powdered drinks by hand. The size is good too, it fits into cupboards easily.
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Reviewed in the United States on April 5, 2026

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