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StarTech.com Cisco QSFP-40G-CSR4 Compatible QSFP+ Module - 40GBASE-SR4 - 40GE Gigabit Ethernet 40GbE Multimode Fiber MMF Optic TransceiverStarTech. com Cisco QSFP 40G CSR4 Compatible QSFP+ Module 40GBASE SR4 MMF Transceiver The StarTech. com Cisco QSFP 40G CSR4 Compatible QSFP+ Module is a high performance optical transceiver designed to deliver reliable 40 Gigabit Ethernet connectivity over multimode fiber. Built to be Cisco CSR4 compatible, this QSFP+ transceiver provides a scalable, cost efficient solution for data centers, enterprises, and service providers seeking to upgrade their
StarTech.com Cisco QSFP-40G-CSR4 Compatible QSFP+ Module — 40GBASE-SR4 MMF Transceiver
The StarTech.com Cisco QSFP-40G-CSR4 Compatible QSFP+ Module is a high-performance optical transceiver designed to deliver reliable 40 Gigabit Ethernet connectivity over multimode fiber. Built to be Cisco CSR4 compatible, this QSFP+ transceiver provides a scalable, cost-efficient solution for data centers, enterprises, and service providers seeking to upgrade their network backbone without compromising interoperability. Engineered to work with Arista Networks switches and routers, it offers broader compatibility across major platform families, enabling seamless cross-vendor deployments and simpler network modernization. With stringent testing and quality assurance, this 40GBASE-SR4 MMF transceiver ensures stable operation in uplinks, spine-leaf architectures, and edge aggregation, while delivering solid performance for latency-sensitive applications such as storage, virtualization, and cloud services. Whether you’re consolidating racks, expanding high-density uplinks, or refreshing aging fiber optics, this transceiver is designed to integrate smoothly into your existing QSFP+ ports and fiber infrastructure.
- 40GBASE-SR4 over MMF: Supports 40 Gbps throughput using four independent 10 Gbps lanes, enabling high-density uplinks over multimode fiber for data centers and enterprise networks.
- Cisco CSR4 compatibility with broad interoperability: Specifically engineered to match Cisco CSR4 specifications while delivering reliable compatibility with Arista switches/routers and other major brands, reducing vendor lock-in and easing upgrades.
- Multimode fiber, 850 nm wavelength: VCSEL-based transceiver designed for MMF (OM3/OM4) fiber with an 850 nm wavelength, optimized for desktop-to-core distances in typical data center layouts.
- Plug-and-play, hot-swappable: Designed for straightforward installation in QSFP+ ports on compatible switches and routers, minimizing downtime and easing field deployments.
- Rigorous testing and reliability: The module is programmed, tested, and validated to work with Cisco CSR4 networks and Arista gear, delivering dependable performance in challenging environments.
Technical Details of StarTech.com Cisco QSFP-40G-CSR4 Compatible QSFP+ Module
- Product Type: QSFP+ transceiver module (40GbE) compatible with Cisco CSR4 specifications.
- Standard: 40GBASE-SR4 for multimode fiber networks.
- Data Rate: 40 Gbps aggregated bandwidth across four 10 Gbps lanes.
- Fiber Type: Multimode fiber (MMF) optimized for short- to medium-range links within data centers.
- Wavelength: 850 nm VCSEL-based transmission suitable for MMF deployments.
- Connector: MPO/MTP 12-fiber interface used to carry the four 10G channels across the connector assembly.
- Distance Capability: Typically up to 100 meters on standard MMF (OM3/OM4) networks, with performance dependent on fiber quality and link budget.
- Compatibility: Cisco CSR4 compliant, tested for interoperability with Arista networks and other major vendors’ switches/routers that support QSFP+ 40G uplinks.
- Form Factor: QSFP+ hot-swappable optical transceiver suitable for standard 40G ports on compatible switches and routers.
- Application Scenarios: Ideal for data center spine-leaf designs, high-density server uplinks, virtualization environments, storage area networks, and enterprise backbone connections requiring reliable 40G connectivity.
How to Install StarTech.com Cisco QSFP-40G-CSR4 Compatible QSFP+ Module
- Power down the equipment and disconnect any connected cables before handling the transceiver.
- Identify a vacant QSFP+ port on the switch or router and align the module with the slot orientation.
- Insert the QSFP+ module firmly into the port until it click-locks into place; ensure the module is seated evenly and securely.
- Connect the multimode fiber cable to the MPO/MTP connector on the transceiver, ensuring proper fiber polarity and connector cleanliness.
- Power up the device, and verify that the link status indicator shows an active connection; configure the interface as 40G (40GBASE-SR4) if required by the device.
Frequently asked questions
- Q: Is the StarTech QSFP-40G-CSR4 module truly Cisco CSR4 compatible? A: Yes. It is designed to align with Cisco CSR4 specifications while maintaining cross-vendor compatibility, including with Arista gear.
- Q: What type of fiber and connector are used? A: The module uses multimode fiber (MMF) with an MPO/MTP 12-fiber connector, optimized for 40GBASE-SR4 transmissions.
- Q: What is the expected reach? A: Typical reach is up to 100 meters on standard MMF fibers (OM3/OM4); actual distance depends on fiber quality and system requirements.
- Q: Can I mix this module with other vendors’ 40G transceivers? A: In most cases, it will work in CSR4-compatible environments but always verify vendor interoperability or run a controlled test in production to confirm stability.
- Q: How do I confirm successful installation? A: After installation, check the link status on the switch/router, verify 40GBASE-SR4 as the interface mode, and monitor for any error counters or link flaps in the interface statistics.
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4.1 ★★★★★
Based on 17 reviews
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Product Reviews
★★★★★ 5
Great product and worth the money.
Size: 4 Panel-88'', Color: Black
Portable and stable. Perfect size and gives me the privacy I need when working from home. Stability is great as long as you place the stands correctly it won't wobble. I love it.
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Reviewed in the United States on May 8, 2026
★★★★★ 5
Attractive
Size: 4 Panel-88'', Color: Grey
The assembled product is just as described. The screens look great! I am using them to hide the cluttered shelving in my garage. The area now looks quite neat Something I must say, though, is that the assembly was extremely difficult. I had to use a silicone spray and some pounding to get the A and B poles to fit together. Also, it required a great deal of strength to stretch and hold the fabric panels so that the bars inserted in each hem lines up with the screws inserted in A/B poles. I strongly recommend having a partner to help with the assembly.
while sc and screw into poles them once inserted intetchedtne end of each pole ( and B poles barely fit together. I used silicone spray on the end and then pounded them
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Reviewed in the United States on December 12, 2025
★★★★★ 5
Works
Size: 3 Panel-102'', Color: Beige, Size: 3 Panel-102'', Color: Beige
It’s beige and not white. Once install - hard to disinstall. Need a drill to put it together
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Reviewed in the United States on May 4, 2026
★★★★★ 3
Does the job, but assembling by yourself is a nightmare
Size: 4 Panel-88'', Color: Black
Does it do the job? Yes, although as others said there are small gaps but it's not a huge deal. The price is also good. But the reason I'm giving it a 3/5 is simply because the assembly for this was a complete nightmare. I honestly don't think I would recommend this to anyone unless they have another person to help them assemble it, because doing it by myself was terrible. I don't think I'd buy this again, I think I'd opt to just spend a bit more money and save myself the trouble personally.
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Reviewed in the United States on May 29, 2026
★★★★★ 4
Reasonably adequate room divider
Size: 4 Panel-88'', Color: Beige
I'm reviewing this as I assemble it.
Couple things:
1. I didn't expect as much assembly. I've ordered dividers before and they more-or-less came as one unit. Sometimes the panels needed screwing together. These require complete assembly and come largely as three rods: two make up vertical columns and snap together. Another one (called part "C") makes the horizontal columns and you have two of these per panel (one attaches to part "A" and the other part "B"). These parts are metal with a plastic shim. Using the wood screws to attach to part "C" is a real pain in the neck. There's not much holding the panel in place so it's a little tricky.
One tactic I've found while I'm assembling that works for the initial connections from parts A and B to their respective "C" rods is to hold the screw in place with a screw driver and then rotating the rod around the screw. This will do a number on your hands if you aren't wearing gloves. This obviously doesn't work when completing the connection.
Using a driller driver on this is really near impossible because there isn't anything you can use to secure it in place. You can use it on the first panel, but as it gets longer, it becomes increasingly difficult and because it isn't wood, it's really tight. I considered drilling larger pilot holes but since there are only 4x4=16 screws I need to screw in, I just decided to use my screw driver to complete it.
2. Also related to assembly. When completing the panels (attaching parts "A" and "B" to parts "C" that have the cloth cover on it), you have to be careful that when you tighten that side that it isn't loosening the other side. Because the pilot holes are so tight, you can end up rotating the rod, which rotates it in the same direction as looser on the original side. Having someone hold the "C" rod in place while you screw it in is probably the easiest approach. I didn't have a 2nd person, so I just had to keep flipping back and forth and tightening both sides as I screwed it in. Not the worlds biggest deal, but annoying nonetheless.
3. The way the instructions are written, they seem to suggest building this thing progressively; that is, you do panel 1, then 2, connect them together, then do 3 and connect it, etc. I took a different route that I suspect saved me quite a bit of trouble, and I assembled all four panels first and THEN connected everything together.
4. For the love of God make sure you check that the plastic tip is on the same side for every panel. Otherwise, you have to take one side apart again and reverse it. On the bright side, if this happens, you've essentially bored out the pilot holes to be the correct size... which is having me question if I shouldn't have just bored them out to the appropriate width in the first place.
5. Attaching all of the panels together is also an enormous pain in the ass unless you happen to have an 88" long elevated surface. Attaching the legs either requires you to elevate one side, which will invariably twist the inexplicably cheap material in the bottom connectors... or you can attach them sideways... or you can put this thing upright, having two people hold the panels in place while you use the allen wrench to tighten the bolts on the underside. None of those are particularly great options.
NOW on to the utility itself.
1. The panels do let some light through (I didn't believe their advertising, and that was one of the reasons that I bought beige, is that I wanted it to not be too dark). They aren't transparent though, so it isn't that far off from their description. They functionally work great, and keep the mess of wires hidden and when I'm sitting at my desk, actually reflect quite a bit of light into my office. Great!
2. My wife has described these as "the most hideous piece of furniture ever conceived of by man." So it does not have spouse approval factor. Granted, she will seldom be in my office area, so that isn't the end of the world.
3. These are really hard to align in a way that doesn't look a little tacky. There are some plastic connectors but they don't do a bang up job of keeping these in place. Each panel is slightly tilted and it's... quite obvious. I may at some point make my own improvements to these to help make them more level. It's not a particularly expensive product so I wasn't expecting much so it's fine and I'm not going to ding them on the rating because of it.
All said, would I buy this product again? Probably not. It's assembly was ~90 minutes which is about 75 minutes longer than I was anticipating spending on this (not including the 5 minute writeup that I'm doing here). But am I going to return it? Also no, if for no other reason I'd be just as annoyed taking it apart and putting it in the original box to return it.
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Reviewed in the United States on October 31, 2023