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QSFP-40G-SR4-S New Cisco QSFP Module for Data Networking 40GBase-SR4 Optical Fiber




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QSFP-40G-SR4-S CISCO: High-Speed Data Transmission Made Easy

In today’s fast-paced digital world, reliable and high-speed data transmission is crucial for businesses. The QSFP-40G-SR4-S CISCO module has emerged as a leading solution, providing organizations with the capability to handle large volumes of data efficiently. We will explore what this module is, its key features, applications, installation process, troubleshooting tips, and its advantages over other QSFP modules. By the end, you’ll have a comprehensive understanding of this impressive networking component.

What is QSFP-40G-SR4-S?

QSFP-40G-SR4-S is a compact, hot-pluggable transceiver module designed for high-density applications in data centers and enterprise networks. It stands for Quad Small Form-Factor Pluggable 40 Gigabit Ethernet Short Reach 4-wavelength. The “SR4” indicates its ability to transmit data over multimode fibers at a short range, while “S” represents it being a Cisco-compatible module.

Key Features of QSFP-40G-SR4-S

The QSFP-40G-SR4-S module offers an array of features that make it a preferred choice for high-speed data transmission. Some of its key features include:

  1. High-Speed Performance: With a data transfer rate of up to 40 gigabits per second (Gbps), the module ensures rapid transmission of large data sets.
  2. Multi-mode Fiber Compatibility: It supports multi-mode fiber connectivity, allowing for shorter distance transmission within data centers or networks.
  3. Hot-Pluggable Design: The hot-pluggable feature enables easy installation and replacement without interrupting the network operations.
  4. Digital Diagnostic Monitoring: The transceiver provides real-time monitoring and reporting of various parameters, such as temperature and optical power, ensuring optimal performance and proactive maintenance.

Applications of QSFP-40G-SR4-S

CISCO has designed the QSFP-40G-SR4-S for high-speed data transmission. Some common applications include:

  1. Data Centers: QSFP-40G-SR4-S is widely used in data centers for connecting servers, switches, and storage devices, ensuring smooth and fast data flow between components.
  2. Enterprise Networks: It facilitates high-bandwidth connections in enterprise networks, enabling efficient communication and data sharing among different departments or branch offices.
  3. Cloud Computing: In cloud computing environments, QSFP-40G-SR4-S supports the rapid transfer of data between cloud servers and storage systems, enhancing overall performance and responsiveness.

Benefits of QSFP-40G-SR4-S

The adoption of QSFP-40G-SR4-S brings several benefits to organizations seeking reliable and efficient data transmission solutions. Some notable advantages include:

  1. High Bandwidth: With its 40Gbps data transfer rate, QSFP-40G-SR4-S accommodates the growing demand for higher bandwidth, ensuring smooth data-intensive operations.
  2. Cost-Effectiveness: QSFP-40G-SR4-S offers a cost-effective solution compared to other high-speed transceiver modules, making it an attractive choice for businesses with budget constraints.
  3. Compact Design: The small form-factor of QSFP-40G-SR4-S allows for increased port density, maximizing the utilization of available space in data centers or network infrastructure.
  4. Reliability and Compatibility: Being a Cisco-compatible module, QSFP-40G-SR4-S ensures seamless integration with existing Cisco network equipment, enhancing reliability and interoperability.

How to Install QSFP-40G-SR4-S

Installing the QSFP-40G-SR4-S module is a straightforward process. Follow these steps to ensure a successful installation:

  1. Step 1 – Safety Precautions: Before installation, ensure that you follow proper electrostatic discharge (ESD) precautions to protect the module from potential damage.
  2. Step 2 – Power Down: Power down the network device and disconnect it from the power source to prevent any electrical hazards during the installation process.
  3. Step 3 – Remove Dust Caps: Remove the dust caps from both the QSFP-40G-SR4-S module and the device’s port.
  4. Step 4 – Align and Insert: Align the QSFP-40G-SR4-S module with the port and gently insert it until it clicks into place.
  5. Step 5 – Secure the Latch: Push the latch on the module to secure it firmly in the port.
  6. Step 6 – Power On and Test: Once the module is installed, power on the device and test the connectivity to ensure a successful installation.

Troubleshooting Tips

Despite the reliability of QSFP-40G-SR4-S, occasional issues may arise. Here are a few troubleshooting tips to help you address common problems:

  1. Check Cable Connections: You need to ensure that the cables connecting the QSFP-40G-SR4-S module are securely attached and undamaged.
  2. Inspect Cleanliness: Verify that the module’s connectors are clean and free from dirt, dust, or debris, as this can affect the signal quality.
  3. Verify Compatibility: Double-check the compatibility between the QSFP-40G-SR4-S module and the network equipment it is connected to, ensuring they are designed to work together.
  4. Update Firmware: If available, update the firmware of the QSFP-40G-SR4-S module to the latest version, as firmware updates often address known issues and improve overall performance.

Comparison with Other QSFP Modules

When comparing QSFP-40G-SR4-S with other QSFP modules, several factors come into play, including data transfer rate, transmission distance, and compatibility. Here’s a quick comparison:

  1. QSFP-40G-SR4 vs. QSFP-40G-LR4: While QSFP-40G-SR4-S supports short-range transmission over multi-mode fibers, QSFP-40G-LR4 is designed for long-range transmission over single-mode fibers.
  2. QSFP-40G-SR4-S vs. QSFP-40G-CSR4: QSFP-40G-SR4-S and QSFP-40G-CSR4 are very similar in most ways. The key difference is that the QSFP-40G-CSR4 supports an extended transmission distance of up to 400 meters on multi-mode fiber.

Best Practices for Using QSFP-40G-SR4-S

To ensure optimal performance and longevity of the QSFP-40G-SR4-S module, consider the following best practices:

  1. Proper Handling: Always handle the module with care, avoiding excessive force or bending of the connectors.
  2. Regular Cleaning: Regularly inspect and clean the module’s connectors using lint-free wipes and approved cleaning solutions to maintain signal integrity.
  3. Environment Monitoring: Ensure the operating environment is within the recommended temperature and humidity range specified by the module’s manufacturer.
  4. Firmware Updates: Stay updated with the latest firmware releases and apply them as recommended. This is highly recommended in order to benefit from improved performance and bug fixes.

Frequently Asked Questions (FAQs)

  1. Q: What is the tab color for the QSFP-40G-SR4-S?
    A: This module comes with a Beige pull tab for ease of identification.
  2. Q: What is the maximum cable distance of QSFP-40G-SR4-S?
    A: The module supports transmission distances of up to 100 meters over multi-mode fibers.
  3. Q: Can QSFP-40G-SR4-S be used for both data and voice transmissions?
    A: Yes, this module can handle both data and voice transmissions, making it versatile for various network applications.
  4. Q: What is the power consumption of QSFP-40G-SR4-S?
    A: QSFP-40G-SR4-S operates at 1.5 Watts of power.
  5. Q: What is the transmission and reception wavelength of QSFP-40G-SR4-S?
    A: The transmission and reception wavelength of this module is between 840 to 860 nm.


The QSFP-40G-SR4-S CISCO module is a reliable and efficient solution for high-speed data transmission in data centers, enterprise networks, and cloud computing environments. It comes with impressive features, easy installation process, and compatibility with various networking devices. The module offers businesses the means to handle increasing data demands. You should follow the best practices and troubleshooting tips. This way organizations can ensure smooth operations and maximize the benefits of this remarkable networking component.


Weight and dimensions for QSFP-40G-SR4-S?
Weight0.35 lbs
Dimensions4 × 1 × 1 in






Warranty for QSFP-40G-SR4-S?
  • The warranty for refurbished units is 30 days.
  • The warranty for New units is as per the manufacturer’s terms and conditions.

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