SKU: 82904288310

StarTech.com Cisco QSFP-40GE-LR4 Comp. QSFP+ Module - 40GBASE-LR4 - 40GE Gigabit Ethernet 40GbE Single Mode Fiber SMF Optic Transceiver

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Description

StarTech.com Cisco QSFP-40GE-LR4 Comp. QSFP+ Module - 40GBASE-LR4 - 40GE Gigabit Ethernet 40GbE Single Mode Fiber SMF Optic TransceiverExperience blazing fast 40 Gigabit Ethernet with the StarTech. com Cisco QSFP 40GE LR4 Comp. QSFP+ Module. This Cisco QSFP 40GE LR4 compatible transceiver is engineered to deliver dependable, high performance 40GBASE LR4 connectivity over single mode fiber (SMF). Designed, programmed and tested to work with Cisco brand switches and routers, this hot swappable QSFP+ module provides a seamless plug and play upgrade path for data centers, enterprise

Experience blazing-fast 40 Gigabit Ethernet with the StarTech.com Cisco QSFP-40GE-LR4 Comp. QSFP+ Module. This Cisco QSFP-40GE-LR4 compatible transceiver is engineered to deliver dependable, high-performance 40GBASE-LR4 connectivity over single-mode fiber (SMF). Designed, programmed and tested to work with Cisco brand switches and routers, this hot-swappable QSFP+ module provides a seamless plug-and-play upgrade path for data centers, enterprise networks, and service-provider environments. Whether you’re upgrading an aging backbone, expanding inter-data-center connectivity, or strengthening core network capacity, this LR4 module helps you achieve longer reach with premium signal integrity, reduced latency, and simplified cabling.

  • 40GBASE-LR4 performance: Delivers the full bandwidth of 40Gbps across four 10Gbps lanes over single-mode fiber, enabling dense, scalable network topologies and future-proofing data-center interconnects with room to grow.
  • Cisco compatibility and reliability: Specifically designed, programmed and tested to work with Cisco switches and routers, ensuring dependable operation in production environments that rely on Cisco infrastructure.
  • Single-mode fiber reach: Optimized for long-reach links on SMF, supporting extended distances between data-center cores, campus backbones, or metro networks while maintaining high signal integrity.
  • Hot-plug QSFP+ form factor: A compact, hot-swappable transceiver that snaps into standard QSFP+ ports, enabling easy upgrades and minimal downtime during installation or replacement.
  • Comprehensive compatibility and support: Backed by StarTech’s robust support ecosystem and product warranties, with compatibility guarantees for Cisco-based deployments and the flexibility to integrate into diverse fiber networks.

Technical Details of StarTech.com Cisco QSFP-40GE-LR4 Comp. QSFP+ Module

  • Product Type: QSFP+ optical transceiver module
  • Standard: 40GBASE-LR4
  • Interface: QSFP+ hot-swappable module for 40G Ethernet links
  • Wavelength: 1310 nm (typical for LR4 operation)
  • Fiber Type: Single-Mode Fiber (SMF)
  • Distance Capability: Long-reach links (distance varies with fiber quality and installation); typically suitable for up to several kilometers on SMF
  • Fiber Connectors: Multilane LC fiber interface (four lanes) compatible with LR4 link configurations
  • Voltage/Power: Standard QSFP+ power consumption typical for 40G LR4 modules; operates within vendor-specified thermal limits
  • Compliance & Compatibility: Compliant with 40GBASE-LR4 specifications; designed for Cisco environments and tested for reliability in mixed-vendor network topologies where applicable
  • RoHS & Quality: RoHS-compliant, built for enterprise-grade performance and long-term operation

how to install StarTech.com Cisco QSFP-40GE-LR4 Comp. QSFP+ Module

Installing the StarTech.com QSFP-40GE-LR4 module is straightforward and aligns with standard procedure for upgrading or expanding Cisco-based networks. Follow these steps to ensure proper seating, alignment, and link establishment without downtime surprises:

  • Power down the affected network equipment if required by your maintenance policy, or follow hot-swappable guidelines if your deployment supports live insertion.
  • Identify an available QSFP+ port on your Cisco switch or router that supports 40G LR4 operation and is configured for high-speed Ethernet.
  • Carefully align the QSFP+ module with the slot, then insert it straight until it seats firmly. Do not apply sideways force; ensure the latch or release mechanism engages as designed.
  • Connect the SMF fiber cables to the module’s four-lane LC fiber interface (as required by your link design), ensuring clean, properly terminated connections with LC connectors. Use appropriate fiber patch cables and routing to minimize bend radius and signal loss.
  • Power up the device (if powered down) and verify the module is recognized by the system. Check link status LEDs and/or the device’s management interface to confirm the 40G link has come up and is stable. Perform a basic throughput check to verify 40Gbps performance across the link.

Post-install considerations include verifying the link budget for the specific MAR/SMF fiber you are using, ensuring proper cabling to minimize attenuation, and validating performance under typical traffic loads. Depending on your network configuration, you may need to configure interface settings on the Cisco device to enable the 40G interface, set appropriate MTU values, and ensure that the LR4 link is operating in the expected mode (for example, single-mode fiber with appropriate WDM channel assignments if applicable). Always refer to Cisco device documentation for exact CLI commands and best practices related to 40G QSFP+ interfaces and LR4 operation.

Frequently asked questions

  • Q: Is this module compatible with Cisco switches and routers? A: Yes. The StarTech.com QSFP-40GE-LR4 Comp. QSFP+ Module is designed, programmed and tested to work with Cisco brand switches and routers, providing reliable 40GBASE-LR4 connectivity on supported Cisco devices.
  • Q: What type of fiber does it use? A: It uses Single-Mode Fiber (SMF) suitable for long-range LR4 links. This enables extended reach between data-center facilities and campus networks when paired with appropriate SMF cabling.
  • Q: What is the maximum distance for LR4 on SMF? A: The LR4 wavelength configuration is optimized for long-distance applications, with reach dependent on fiber quality, connectors, and overall link budget. Typical deployments target multi-kilometer links, subject to installation conditions.
  • Q: How do I install this module? A: The module is hot-swappable and fits standard QSFP+ ports. Insert into a compatible slot, attach the SMF fibers, power on the device (if required), and verify the link status and throughput using your device’s management interface or CLI.
  • Q: Can I mix this module with other vendors? A: While designed for Cisco compatibility, LR4 modules can operate in certain mixed-vendor environments if the devices support third-party transceivers and the link budget meets requirements. Always check the specific device and network policy before deployment.
  • Q: Is there a warranty? A: StarTech typically offers warranty coverage and access to technical support for this module, providing assurance for enterprise deployments and data-center operations.
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SKU: 82904288310

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4.8 ★★★★★
Based on 17 reviews
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Product Reviews
A
Verified Purchase
Amazon Customer
Charlottesville, US
★★★★★ 5
Soft keyboards ( updated)
The keys fell off very easily after only 2.5 months of use. It is a nice and smooth keyboard. I like it, but it didn't last even 3 months. I am trying to get it repaired by them since it was so recent that I got it- I will update this review later once I hear from the manufacturer. This is an update to my original post. I am extremely impressed with the quality of customer service and how fast they addressed my concerns regarding the product and they honestly back up their product. Not only did they respond fast, but they also replace my keyboard. Not just fix it, replaced the whole thing and it is also backed by their manufacturer warranty. I’m so happy and love that I get to have my keyboard back to use for hopefully a lot longer this time. It truly is a comfort keyboard and I love how smooth the keys feel when typing for long periods of time. Thanks guys for the prompt response! Today 3/27/2026 I received my brand new keyboard to replaced the one with the broken keys and I’m so happy to it back again and fully working thanks guys for the great customer service. Truly appreciate it.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 24, 2026
C
Verified Purchase
Christy
Pawtucket, US
★★★★★ 5
Great keyboard at the right price
I bought this to replace my old Logi Ergo K860. I like the idea of curved keyboard. But the distance between my left and right hands on Ergo K860 was bothering me ever since I bought it 5 years ago. I would say I never got used to it. The Ergo started to act up one day with one key F not working properly. I tried to fix it and considered getting another one, then I saw this keyboard with a much better price. So I took the chance and went with this cheaper option. I like this one better than Ergo for the following reason: 1. The layout is more comfortable. Yes, it took me a while to get used to it like I would with any keyboard. I don't have to twist my wrists to reach any keys. 2. Keys are not too loud. It's not going to silent, but better than Ergo. 3. Battery life is great. I make a living by typing my keyboard. I only charged this keyboard once so far (4 months). 4. The price is great for what I got.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on September 7, 2025
P
Verified Purchase
Paul in SF
Fort Morgan, US
★★★★★ 4
Good keyboard, some auxiliary keys are moved from where I was used to
I've only been using this for a day, so I can't speak about battery life. It is rechargeable, and it has an on-off switch for saving the battery when I'm not using it, so I don't know what more I could ask for on that front. Likes: the main keyboard is definitely ergonomic and feels comfortable; the key action is not silent, which I actually like, and the scissor action switches underneath the keys feels good to me; the keyboard is about 1.5" narrower than my previous keyboard (Logitech Ergo K860) because the number pad is right next to the regular part of the keyboard, and the usual keys in between have been rearranged. Most of these changes will just require the user to get used to the new positions. However, the Home, End, Pgup and Pgdn keys are now Function keys, piggybacking on the arrow keys, and that may cause more trouble for people who use those a lot (I don't, so I don't mind it). Dislikes: experience has shown me that dust and crud get into the space between the wrist pad and the rest of the keyboard. On my old keyboard, I could remove the wrist pad using some tiny screws in the back, and take the pad out for thorough cleaning. With this keyboard I won't be able to do that, so time will tell how aggravating that will be. Maybe I'll have to take it down to my shop and blow out the crud with the air compressor (joking, probably not a good idea). Overall, not quite 5 stars, but close. If it lasts better than the Logitech, I may come back and put in that last star. Update: It has lasted about 20 months, and I'm going to have to replace it. I may buy another one, 20 months is pretty good for the amount of use I have gotten out of it, but I'm going to search to see if anything new and better is around. Symptoms seem to indicate that the rechargeable battery is not taking a charge any more. The keyboard works find when it is plugged in, but when I unplug it, after a few minutes it goes wacky.
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Reviewed in the United States on May 16, 2024
B
Verified Purchase
Bendrix Bailey
Lake Worth, US
★★★★★ 1
Arrived Battery DOA - But then something unexpected happened.
This was a one star review because the unit arrived with a batter that would not hold charge for more than a minute. I am not changing the stars, because if you are like me, you read the one star reviews cause so many companies pay for fake 4 and 5 star reviews. When I first posted this review I also initiated a return and just planned to move on to another brand. I was surprised when I got a personal email from the Arctek Service Team offering to send me a replacement free of charge. With nothing to lose I figured why not? The new unit arrived and I put a full charge on it and put it to work. I chose this keyboard because it is the closest in layout to the original Microsoft ergo split keyboard, no longer in production, that I have used for years and truly enjoy. I am pleased to report that the battery is working fine and the keyboard performs flawlessly. No skipped strokes or stuck keys, no glitches with the proprietary wireless interface to the laptop (when I am using it on the desk with a large screen). My hat is off to the Arctek service team and management. A company that cares enough about its reputation and customers to go to so much effort to take care of a customer with such a small dollar item sale is a company you can expect to rely on. From now on when I want electronic gear on Amazon, I am going to use the word Arctek in my search.
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Reviewed in the United States on April 9, 2026
M
Verified Purchase
MJ
Cuba, US
★★★★★ 5
Incredible
1 year update: I have been using this keyboard daily at work for almost one year and my 5 star review stands. Upon receiving the keyboard I charged it before use, and since then I have not charged it at all and it is still somehow at 75% battery!! I turn it off at night when I’m done. One of the function keys broke off in a way where I can’t reattach it, but I reached out to customer support and they sent me a free replacement keyboard. Great customer service and warranty! Original review: I love this keyboard. I am a grant writer so I write and edit all day. It has really leveled up my typing experience and has made work much more comfortable. It puts my hands in a natural position so my wrists no longer bend at odd angles. I adapted to the split key design in minutes. The keys have an excellent feel and sound to them and the wrist pad feels like a soft cloud. I’ve had no connectivity issues and so far the battery has been stellar. It also has rubber grippers on the bottom so it stays firmly in place on my desk and doesn’t move around like my old keyboard did. I went for this one because I didn’t want to spend $100+ on a keyboard and I’m really impressed with the quality.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on September 6, 2024

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