QSFP-40G-LR4 vs. QSFP-40G-LR4-S Modules: Which Should You Buy?

In modern networking, picking the right transceiver modules is very important for efficient and high-performance data transmission. These key components make sure that network connections are fast and reliable, so choosing the right ones is essential for the best network setup.

Among the various options, the QSFP-40G-LR4 and QSFP-40G-LR4-S modules are popular choices for high-speed connectivity. This article will compare these two modules, looking at their specifications, performance, and suitability for different network situations.

What is the QSFP-40G-LR4?

The Cisco QSFP-40G-LR4 module, also known as the Cisco 40GBASE-LR4, is designed for high-density and low-power 40 Gigabit Ethernet connectivity over single-mode fiber (SMF). It supports the OTU-3 data rate and complies with IEEE standards. It ensures reliable performance across various network environments.

QSFP-40G-LR4 key specifications include:

Cable Type: Singlemode Fiber (SMF)

Connector Type: LC Duplex

Data Transfer Rate: 40 Gbps

Wavelength: 1310nm

Maximum Reach: 10km

Operating Temperature Range: 32°F to 158°F

Storage Temperature Range: -40°F to 185°F

Dimensions: Depth 2.85 in, Height 0.53 in, Width 0.72 in

Compatibility: Broad Compatibility, Versatile Use, Multi-Vendor Support.

Special Features: Hot-swappable, IEEE-Compliant, High Efficiency, Robust Performance.

What is the QSFP-40G-LR4-S?

The Cisco QSFP-40G-LR4-S module, also known as Cisco 40GBASE-LR4-S, offers a robust solution for high-speed data transmission over Singlemode Fiber (SMF). With a 40 Gigabit data transfer rate and a reach of up to 10km, this module utilizes four 1310nm wavelengths, each transmitting data at up to 10Gbps per channel.

QSFP-40G-LR4-S key features include:

Cable Type: Singlemode Fiber (SMF)

Connector Type: LC Duplex

Data Transfer Rate: 40 Gbps

Wavelength: 1310nm

Maximum Reach: 10km

Operating Temperature Range: 32°F to 158°F

Storage Temperature Range: -40°F to 185°F

Dimensions: Depth 2.85 in, Height 0.53 in, Width 0.72 in

Compatibility: Works perfectly with Cisco equipment

Special Features: Hot-swappable, specially designed for cisco centric environment.

Key Differences Between QSFP-40G-LR4 and QSFP-40G-LR4-S

  • Versatility

The 40G Base-LR4 is a versatile asset for your network. It accommodates both 40GBASE Ethernet and OTU-3 standards, offering flexibility for various configurations. Large companies prefer using it in their main networks because it can handle different types of connections without any hassle.

On the other hand, the 40G Base-LR4-S is more focused like a specialist. It only supports the 40GBASE Ethernet standard, which makes it perfect for Cisco-centric setups for high-speed connections between servers in a data center.

  • Applications

The Cisco 40GBase-LR4 is great for complex networks that need to support a variety of standards. Big enterprises can rely on it for both Ethernet and OTU-3 tasks. The Cisco 40GBase-LR4-S, however, shines in environments that need fast Ethernet connections without the extra complexity. Data centers can benefit from its simplicity and speed, focusing on quick, reliable Ethernet communications.

  • Cost Efficiency

Let's talk about saving money. Between the QSFP-40G-LR4 and QSFP-40G-LR4-S, the QSFP-40G-LR4-S is the more budget-friendly choice. Factory Sealed Cisco units are priced at $1,225.99, CablesAndKits units at $337.99, and CK Certified Refurbished Cisco units at $459.79.

If you run a small to medium-sized business and need to upgrade to 40G, the 40GBase-LR4-S helps you save money while still getting top-notch speed, especially if you’re using Cisco equipment.

But if your network includes different brands, the QSFP-40G-LR4, being more versatile, might be a better fit. It ensures everything works well together. The key is balancing your budget with compatibility needs.

  • Specifications

The Cisco QSFP-40G-LR4 has a special feature with OTU-3 support, which is crucial for service providers who need to manage both Ethernet and OTU-3. It offers more flexibility for different network setups. On the flip side, the Cisco QSFP-40G-LR4-S focuses on Ethernet tasks. It's perfect if you’re looking for a straightforward Ethernet solution.

  • Capabilities

Both modules support link lengths up to 10 kilometers over G.652 single-mode fiber with duplex LC connectors. They handle the 40 Gigabit Ethernet signal over four wavelengths. However, the OTU-3 support in the QSFP-40G-LR4 gives it an extra edge, making it ideal for complex network environments and service providers. The QSFP-40G-LR4-S, while powerful, is designed for Ethernet-specific tasks, making its deployment simpler in focused applications.

Which Module Should You Choose?

Picking the right module really depends on what you need and your network setup. Let’s look at some real-life examples to help you figure it out:

  • Small to Medium-Sized Businesses with All Cisco Equipment

If your business relies entirely on Cisco transceiver modules, upgrading to QSFP-40G-LR4-S is a perfect choice. The Cisco 40GBASE-LR4-S offers high-speed connectivity and saves you money. It fits perfectly with your existing Cisco setup, making it an easy choice.

  • Large Enterprise with Mixed-Brand Equipment

Running a large enterprise with a variety of brands? You need a module that can handle different types of equipment. The QSFP-40G-LR4, being versatile, is your best bet. It ensures everything works smoothly together and meets your complex networking needs.

  • University Campus Network

If you’re managing a university campus, you need to connect buildings spread out over a large area. Both the QSFP-40G-LR4 and QSFP-40G-LR4-S can handle distances up to 10 kilometers. But if your network has a mix of devices and requires versatile support, go for the Cisco QSFP-40G-LR4. If your setup is mainly Cisco-based and focused only on Ethernet, the 40GBase-LR4-S will do the job and save you some cash.

  • Service Provider Needing Flexibility

As a service provider offering both Ethernet and OTU-3 services, the QSFP-40G-LR4 is the right module for you. Its versatile support provides the flexibility to meet various customer needs. You can maintain a versatile network infrastructure that supports a wide range of services.

In short, if you need versatility and broad compatibility, go with the QSFP-40G-LR4. But if you’re looking for a cost-effective, Cisco-specific solution, the QSFP-40G-LR4-S is perfect. Your decision should be based on your network requirements, existing equipment, and budget.

Final Thoughts

Choosing the right transceiver module depends on your network setup. If you have equipment from different brands and need something flexible, the QSFP-40G-LR4 is a great choice. It supports both Ethernet and OTU-3 standards, making it adaptable to various complex environments. This module fits well in diverse setups, ensuring smooth operations across different devices.

If your network is primarily Cisco equipment, the QSFP-40G-LR4-S is the better option. It’s designed specifically for Cisco systems, providing seamless integration and top performance. For a Cisco-centered network, a 10Gbase LR-S module ensures efficient and reliable high-speed connectivity without unnecessary costs.

Think about what your network needs. Go with the QSFP-40G-LR4 for flexibility and compatibility with various brands, or choose the QSFP-40G-LR4-S for a cost-effective solution tailored to a Cisco-focused setup. Picking the right module helps keep your network running smoothly and efficiently. If you need help selecting the right module or want more information, feel free to reach out.

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