251 Little Falls Drive, Wilmington, DE 19808


Mon - Fri 9 AM - 5 PM Eastern Time

Call us at 833-375-8324

Close this search box.

Actual product may vary from the images

QSFP-40G-SR4 Cisco QSFP 40 Gigabit LAN Transceiver Module

MPN: QSFP-40G-SR4 | UPC: 0 882658745416 | CONDITION: New



Availability: 33 in stock

Our Shipping Partners

Secure Stripe Payments

Major Credit Cards Accepted

Free Ground Shipping in USA

Secure Payments

Safe Checkout

QSFP-40G-SR4: The Ultimate Solution for High-Speed Data Transfer

Are you looking for a reliable and efficient solution for high-speed data transfer between switches, routers, and other networking equipment? Look no further than the QSFP-40G-SR4 transceiver module. In this article, we will explore the features, applications, and benefits of the module.

Table of Contents

  1. Introduction
  2. What is QSFP-40G-SR4?
  3. Features of QSFP-40G-SR4
  4. Applications of QSFP-40G-SR4
  5. Benefits of QSFP-40G-SR4
  6. How to Install QSFP-40G-SR4?
  7. How to Troubleshoot QSFP-40G-SR4?
  8. Conclusion
  9. FAQs


The QSFP-40G-SR4 is a quad small form-factor pluggable (QSFP+) transceiver module that supports data transfer rates of up to 40Gbps. It is designed to provide high-speed data transfer over short distances, making it ideal for use in data centers, storage area networks (SANs), and other high-performance computing applications.

What is QSFP-40G-SR4?

The QSFP-40G-SR4 is a hot-pluggable transceiver module that uses parallel multimode fiber (MMF) cables to transmit and receive data. It supports four channels of 10Gbps data transfer, providing a total bandwidth of 40Gbps. The module is compliant with the QSFP+ MSA and IEEE 802.3ba 40GBASE-SR4 standards.

Features of QSFP-40G-SR4

The QSFP-40G-SR4 module has several features that make it a reliable and efficient solution for high-speed data transfer. Some of its key features include:

  • Support for 40Gbps data transfer rates
  • Four channels of 10Gbps data transfer
  • Multimode fiber (MMF) support for distances up to 150 meters
  • Hot-pluggable design for easy installation and removal
  • Low power consumption

Applications of QSFP-40G-SR4

The QSFP-40G-SR4 module is widely used in data centers, storage area networks (SANs), and other high-performance computing applications. Some of its common applications include:

  • High-speed data transfer between switches, routers, and other networking equipment
  • Storage area networks (SANs)
  • High-performance computing applications

Benefits of QSFP-40G-SR4

The QSFP-40G-SR4 module provides several benefits for high-speed data transfer applications. Some of its key benefits include:

  • High-speed data transfer rates of up to 40Gbps
  • Support for short-distance data transfer up to 150 meters
  • Easy installation and removal with hot-pluggable design
  • Low power consumption
  • Compliance with industry standards for compatibility and reliability

How to Install QSFP-40G-SR4?

Installing the QSFP-40G-SR4 module is a simple process that can be completed in a few easy steps. Here’s how to install the module in your networking equipment:

  1. Turn off the power to your networking equipment.
  2. Remove the protective cover from the QSFP+ port.
  3. Insert the module into the QSFP+ port.
  4. Apply gentle pressure to ensure the module is securely connected.
  5. Turn on the power to your networking equipment.

How to Troubleshoot QSFP-40G-SR4?

a. Common issues with QSFP-40G-SR4:

The following are some common issues you may encounter with QSFP-40G-SR4:

  • No link: When the module fails to establish a link with the remote end, it may indicate a faulty cable, port, or transceiver.
  • Low power: If the module is not transmitting or receiving data, it may indicate low power levels or a damaged module.
  • High bit error rate (BER): When the BER is higher than the acceptable range, it may indicate a poor quality fiber link, dirty connectors, or a faulty module.
  • Overheating: When the module temperature exceeds the recommended range, it may lead to data transmission errors or module failure.

b. Steps to troubleshoot QSFP-40G-SR4:

If you encounter any of the issues mentioned above, here are some steps to troubleshoot the module:

Step 1: Verify the physical connection: Ensure that the module is properly seated in the port and that the cable is securely attached. Check for any physical damage to the cable or module.

Step 2: Check the power levels: Verify that the power levels are within the acceptable range using an optical power meter. If the levels are low, try replacing the cable or module.

Step 3: Clean the connectors: Use a lint-free cloth and alcohol to clean the connectors on both ends of the cable. Dirty connectors can cause high BER and other transmission errors.

Step 4: Check the fiber quality: Use an OTDR (Optical Time Domain Reflectometer) to test the fiber quality. If the fiber link is poor, try replacing the cable or using a different fiber type.

Step 5: Monitor the temperature: Check the module temperature using a digital thermometer. If the temperature is too high, try improving the airflow or replacing the module.

QSFP-40G-SR4 Specifications

Before discussing the advantages and applications of the module, let’s take a look at its specifications:

  • QSFP+ form factor
  • Four-channel full-duplex transceiver module
  • Supports 40G Ethernet and Infiniband standards
  • Up to 150 meters OM4 MMF transmission
  • 850nm VCSEL laser and PIN receiver array
  • MPO-12 optical connector
  • Operating temperature range: 0°C to 70°C

Advantages of QSFP-40G-SR4

QSFP-40G-SR4 offers several advantages that make it a popular choice in data centers and high-speed networking applications:

High Bandwidth and Throughput

With four independent transmit and receive channels, QSFP-40G-SR4 provides high bandwidth and throughput, allowing for faster data transfer rates and more efficient network performance.

High Density

QSFP-40G-SR4 offers high port density, which means more ports can be accommodated in a single switch or router. This helps reduce the need for additional networking equipment and saves valuable rack space in data centers.


Using QSFP-40G-SR4 transceivers can be more cost-effective than using traditional optical fiber solutions, as it eliminates the need for expensive equipment and installation costs.


QSFP-40G-SR4 is compatible with a wide range of networking equipment, making it a versatile solution for various networking applications.

Applications of QSFP-40G-SR4

QSFP-40G-SR4 is widely used in data centers and high-speed networking applications, such as:

High-Performance Computing

This module connects servers, storage devices, and switches in high-performance computing (HPC) applications to enable high-speed data transfer and efficient performance.

Cloud Computing

Cloud computing applications use the module to connect servers and switches, enabling high-speed and reliable network connections for cloud-based applications and services.

Data Centers

Data centers use QSFP-40G-SR4 module to connect servers and switches for high-speed data transfer and efficient network performance.

High-Speed Networking

High-speed networking applications, such as telecommunications, use QSFP-40G-SR4 to provide high-speed data transfer between switches, routers, and other networking equipment as well.


QSFP-40G-SR4 is a versatile and cost-effective solution that provides high bandwidth, high density, and interoperability for various networking applications. QSFP-40G-SR4 finds extensive use in data centers, high-performance computing, cloud computing, and telecommunications applications, owing to its exceptional specifications and benefits.


  1. What is QSFP-40G-SR4?
    A: QSFP-40G-SR4 is a Quad Small Form-factor Pluggable (QSFP) transceiver module that is designed to support high-speed data transfer rates of up to 40Gbps over multimode fiber optic cable.
  2. What is the maximum transmission distance of QSFP-40G-SR4?
    A: The maximum transmission distance of QSFP-40G-SR4 is 150 meters over OM4 multimode fiber optic cable.
  3. Can QSFP-40G-SR4 be used with single-mode fiber optic cable?
    A: No, QSFP-40G-SR4 is designed to be used with multimode fiber optic cable only.
  4. What are the compatible networking devices for QSFP-40G-SR4?
    A: QSFP-40G-SR4 is compatible with a wide range of networking devices that support QSFP transceiver modules, including switches, routers, and servers.
  5. How do I know if my networking device is compatible with QSFP-40G-SR4?
    A: You should check the technical specifications of your networking device to ensure that it supports QSFP transceiver modules and has the appropriate QSFP port for the module.
  6. What should I do if QSFP-40G-SR4 is not working properly?
    A: To troubleshoot any issues with the QSFP-40G-SR4 module, it is recommended to check the connections, ensure proper installation of the module, and verify the compatibility of the networking device with the module. If the issue persists, you should contact the technical support team for further assistance.
  7. Can QSFP-40G-SR4 be used for both data and voice communication?
    A: You can use this module for both data and voice communication provided that the networking devices and cables used meet the required specifications and are compatible with the module.


Weight and dimensions for QSFP-40G-SR4?
Weight0.25 lbs
Dimensions3 × 1 × 1 in







0 882658745416

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

Request for Bulk Discount

Related Products

Scroll to Top

Bulk Pricing Request Form