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    Products / Transceivers / 25G/40G Transceivers / 40G QSFP+ / 101849
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    Cisco QSFP-40G-CSR-S Compatible 40GBASE-SR4 QSFP+ 850nm 150M DDM MTP/MPO MMF Optical Transceiver Module

    Product No: 101849
    0 Reviews
    12.9K Sold
    $25.00  $33.90
    Compatible
    Transceivers type
    205 in real-time stock, 26Oct, 2026

    Free Shipping over US$ 79.8

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    Warranty
    Providing industry-leading limited lifetime warranty.
    Please check our warranty policy for details.
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    1. MTP/MPO-12 Male Connector
2. Low Pwer Consumption <0.7W
3. For Data Center, Campus Network, 40G to 10G Break-out
4. Compatible with 100+ Vendors
5. Hot Pluggable SFF 8436 MSA Compliant
    See more

    Specifications

    Cisco QSFP-40G-CSR-S Compatible 40GBASE-SR4 QSFP+ Optical Transceiver Module (MMF, 850nm, 150m, MTP/MPO, DDM)

      

    The Cisco QSFP-40G-CSR-S compatible 40G QSFP+ transceiver module is equipped with an MTP-12 male fiber connector, reaching a link up to 150m over laser-optimized OM4 multimode fiber (100m over OM3 MMF). It is verified to interoperate with original Cisco switches, including the Catalyst 9400/9500/9600/9800 and Nexus 9300/9500/9800/6000/7000 series, etc. It also supports breakout to 4x 10GBASE-SR SFP+ via MTP/MPO-8 to 4x LC duplex OM3/OM4 breakout cables. This 40G optical transceiver comes with a bidirectional 4-channel QSFP+ connector, enabling a total 40Gbps bandwidth by each channel carrying a 10 Gbps data rate. DOM/DDM (digital diagnostics monitoring) function is supported on the QSFP 40G fiber transceiver to achieve real-time operating parameters monitoring.

     

    QSFPTEK manufactured 40GBASE-SR4 QSFP+ module is compliant with QSFP+ MSA (SFF-8436) and IEEE 802.3ba 40GBASE-SR4 specifications. Besides, the quad small form-factor pluggable (QSFP) SR4 optic has been tested on host devices to ensure full compatibility with Cisco equipment, such as data center switches, enterprise routers, and server network interface cards (NICs). The third-party 40G SFP module is an ideal substitute to the Cisco QSFP-40G-SR4 QSFP+ 40G transceiver at an affordable price, providing a cost-effective compatible solution for high-performance 40G connectivity.

      

    Model Name  QSFP-40G-CSR-S Vendor Name QSFPTEK
    Form Factor QSFP+ Data Rate 40 Gbps
    Wavelength 850nm Distance 150m@OM4/100m@OM3
    Connector MTP/MTO-12 Male Cable Type OM4/OM3 MMF
    Transmitter Type VCSEL Receiver Type PIN
    TX Power -7~1dBm Receiver Sensitivity <-9.5dBm
    Power Consumption <0.7W Modulation Format NRZ
    DDM Support Bit Error Ratio (BER) 1E-12
    Protocols IEEE 802.3ba, QSFP+ MSA, SFF-8436, Infiniband 40G QDR Warranty 5 Years
    Quality Testing Program
    Optical Transceivers Testing

    Take a look at our test program to get the reliable and high-performance optical transceivers.

    Quality Certifications

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    Features

    • 1. High Reliablility and Best Price
      Proudly self-producing and rigorous testing, QSFPTEK is dedicated to delivering cost-effective products with high reliability and performance at trade price.
    • 2. Wide Application Scenarios
      Fully compatible with almost all Cisco devices. Ideal for data centers, campus networks, metro networks, etc.
    • 3. Protocols
      Compliant with IEEE 802.3ba, QSFP+ MSA, SFF-8436, SFF-8636.
    • 4. Quality Certifications
      Backed by CE, FCC, ROSH, ISO9001.

    Applications

    Scenario 1: 40G to 40G Direct Connectivity

    40GBASE-SR4 40G to 40G Direct Connectivity

     

        

    Scenario 2: 40G to 10G Breakout Connectivity

    40GBASE-SR4 40G to 10G Breakout Connectivity

          

      

    Scenario 3: 40GBASE-SR4 Connectivity with NIC

    40GBASE-SR4 Connectivity with NIC

     

    Product details

    Seamlessly Achieve 10G to 40G Migration

      

    Upgrade the Spine to 40G gear while maintaining the 10G Leaf architecture, achieving seamless 10G to 40G migration.

     

     

    Various Switch Tests

     

    Every module is quality tested for compatibility in the multi-brand switches environment, which guarantees flawless operations.

     

     

     

    Tested in The Host Device to Prove Interoperability

     

    Every unit sold undergoes rigorous quality testing, to ensure compatibility in the target switch environment, guaranteeing perfect operation.

     

    QSFPTEK Test Rack

     

     

    Various Switch Tests

     

    Every module is qualified through rigorous procedures and advanced equipment to ensure high-quality and reliable optical devices for you.

     

    QSFPTEK Test Devices

     

     

    40G QSFP+ Model Contrast Table

     

    Part Number

    QT-QSFP+-SR4

    QT-QSFP+-IR4

    QT-QSFP+-PSM4

    QT-QSFP+-LR4

    QT-QSFP+-LR4-20

    QT-QSFP+-ER4

    QT-QSFP+-ZR4

    Image

    Wavelength

    850nm

    CWDM

    1310nm

    CWDM

    CWDM

    CWDM

    LWDM 1294~1310nm

    Max Distance

    150m

    2km

    10km

    10km

    20km

    40km

    80km

    Cable Type

    OM3/OM4 MMF

    OS2 SMF

    OS2 SMF

    OS2 SMF

    OS2 SMF

    OS2 SMF

    OS2 SMF

    Connector

    MPO/MTP-12

    LC Duplex

    MPO/MTP-12

    LC Duplex

    LC Duplex

    LC Duplex

    LC Duplex

    Tx Power(dBm)

    -7 ~ 1

    -7 ~ 2.3

    -6 ~ -1

    -7 ~ 2.3

    -4 ~ 2.3

    -2.7 ~ 4.5

    -2.7 ~ 4.5

    Rx Sensitivity(dBm)

    -9.5

    -11.5

    -14.4

    -13.7

    -11.5

    -19

    -28

    Power Consumption

    <0.7W

    <2.5W

    <2.5W

    < 2.5W

    <3.5W

    <3.5W

    <5W

    Source

    VCSEL + PIN

    DFB + PIN

    4xDFB + PIN

    DFB + PIN

    DFB + PIN

    DFB + PIN

    4xDFB + APD

    Operating Temperature

    0 to 70°C

    0 to 70°C

    0 to 70°C

    0 to 70°C

    0 to 70°C

    0 to 70°C

    0 to 70°C

    Questions & Answers

    • All (8)
    • Can this module work at 80°C?
      No, it can't. The working temperature range is 0 to 70°C.
    • Does the qsfp-40g-sr4 transceivers allow 4x 10g connectivity?
      Yes. The connectivity is achieved by using an 8-fibers OM4 MTP-LC Type B break-out cable, which connects the qfp-40g-sr4 transceivers to four sfp-10g-sr optical interfaces.
    • What is the difference between Cisco qspf-40g-lr4 and qsfp-40g-lr4-s?
      They are actually the same one.

    Customer Reviews

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    Resources

    • PDF Document
      QT-QSFP+-SR4 150M Datasheet.pdf
    • PDF Document
      Transceiver Module User Guide.pdf
    Check Test Reports on Target Device
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    Cisco QSFP-40G-CSR-S Compatible 40GBASE-SR4 QSFP+ 850nm 150M DDM MTP/MPO MMF Optical Transceiver Module

    Compatible Cisco

    Transceivers type QSFP-40G-CSR-S

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    Satisfaction
    Customer Gallery
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    Mark

    2023-12-15
    This product works well with my switch, and I plan to buy some DWDM transceivers from QT. Excellent value fo ct works well with my switch, and I plan to buy some DWDM transceivers from QT. Excellent valur money!

    Verified Purchase

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    Cisco QSFP-40G-CSR-S Compatible 40GBASE-SR4 QSFP+ 850nm 150M DDM MTP/MPO MMF Optical Transceiver Module
    $33.90
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    Product image
    Cisco QSFP-40G-CSR-S Compatible 40GBASE-SR4 QSFP+ 850nm 150M DDM MTP/MPO MMF Optical Transceiver Module

    Compatible Cisco

    Transceivers type QSFP-40G-CSR-S

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