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    Home / Products / Transceivers / 100G/200G Transceivers / 100G QSFP28 / 88421

    Cisco QSFP-100G-CWDM4-S Compatible 100GBASE-CWDM4 QSFP28 1310nm 2km LC Duplex SMF DDM Optical Transceiver Module

    Product No: 88421
    20 Reviews
    1.7K Sold
    US$ 83.90
    Compatible
    Transceivers type
    1794 in real-time stock, 22 Jun, 2026

    Free Shipping over US$ 79.8

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    5-Year Warranty 30-Day Returns 90-Day Exchange
    Warranty
    Providing industry-leading limited lifetime warranty.
    Please check our warranty policy for details.
    Returns & Exchange
    Exchanges caused by the customer's reasons will not be accepted.
    Please ensure that the item you're returning is repackaged with all the cords, adapters, and documentation included when you receive it.
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    Add to Cart Bulk Order Quotes 
    1. Rate: 100G; Connector: LC; with DDM
2. CWDM DFB+PIN; Low Power Consumption ≤3.5W
3. Applied in Campus Network, Data Center and Enterprise Core Layer
4. Compatible with 100+ Vendors
5. Hot Pluggable QSFP28 MSA Compliant
    See more

    Specifications

    Cisco QSFP-100G-CWDM4-S Compatible 100GBASE-CWDM4 QSFP28 Optical Transceiver Module (SMF, 1310nm, 2km, LC, DDM)

     

    The Cisco QSFP-100G-CWDM4-S compatible optical transceiver module is designed with duplex LC connectors, reaching a link up to 2km over single-mode fiber (OS2). It is verified to interoperate with original Cisco switches, including the Catalyst 9400/9500/9600 and Nexus 9300/9500/9800/3000 series. QSFPTEK manufactured 100GBASE-CWDM4 QSFP28 transceiver module is compliant with IEEE 802.3bm, 100G QSFP28 CWDM4 MSA standard. Besides, DDM (digital diagnostics monitoring) function is supported on the 100G fiber optic transceiver to achieve real-time operating parameters monitoring. With these features, this 100G QSFP28 transceiver is widely applied in data centers, campus networks, the enterprise core layer, etc.

     

    Part Number QT-QSFP28-IR4 Vendor Name QSFPTEK
    Form Factor QSFP28 Data Rate 103.125 Gbps (4x 25.78Gbps)
    Wavelength 1271~1331nm Distance 2km
    Connector Duplex LC Cable Type OS2 SMF
    Transmitter Type 4x CWDM DML (DFB) Receiver Type PIN
    TX Power -6.5~2.5dBm Receiver Sensitivity <-11.5dBm
    Power Consumption ≤3.5W Modulation Format NRZ
    DDM Support Bit Error Ratio (BER) 5E-5
    Protocols IEEE 802.3ba, IEEE 802.3bm, SFF-8665, SFF-8636, 100G CWDM4 MSA, QSFP28 MSA 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

    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 network, enterprise core layer, etc.
    • 3. Protocols
      Compliant with IEEE 802.3ba, IEEE 802.3bm, SFF-8665, SFF-8636, 100G CWDM4 MSA, QSFP28 MSA.
    • 4. Quality Certifications
      Backed by CE, FCC, ROSH, ISO9001.

    Applications

    Scenario 1: 100G Switch to 100G Switch Direct Connectivity

     

    Scenario 1: 100G Switch to 100G Switch Direct Connectivity

     

     

    Scenario 2: 100G Switch to 100G NIC Direct Connectivity

     

    Scenario 2: 100G Switch to 100G NIC Direct Connectivity

     

    Product details

    Various Switch Tests

     

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

     

    QSPFTEK LAB All Brands Switches Show

     

     

    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

     

     

    Comprehensive Testing

     

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

     

    QSFPTEK Test Devices

     

     

    100G QSFP28 Model Contrast Table

            

    Part Number

    QT-QSFP28-SR4

    QT-QSFP28-PSM4

    QT-QSFP28-IR4

    QT-QSFP28-LR4

    QT-QSFP28-CWDM-LR4

    QT-QSFP28-ER4 (Rx SOA)

    QT-QSFP28-ZR4

    Image

    Wavelength

    850nm

    1310nm

    1271~1331nm

    1310nm

    1271~1331nm

    1310nm

    1310nm

    Max Distance

    100m

    500m

    2km

    10km

    10km

    40km

    80km

    Cable Type

    OM3/OM4 MMF

    OS2 SMF

    OS2 SMF

    OS2 SMF

    OS2 SMF

    OS2 SMF

    OS2 SMF

    Connector

    MPO/MTP-12

    MPO/MTP-12

    LC Duplex

    LC Duplex

    LC Duplex

    LC Duplex

    LC Duplex

    Tx Power(dBm)

    -8.4~+2.4

    -9.4~+2

    -6.5~+2.5

    -4.3~+4.5

    -6.5~+2.5

    -2.9~+4.5

    +2~+7

    Rx Sensitivity(dBm)

    -10.3

    -12.66

    -11.5

    -10.6

    -11.5

    -20.9

    -27

    Max Power Consumption

    2.5W

    3.5W

    3.5W

    4W

    3.5W

    5W

    5.5W

    Source

    VCSEL+PIN

    DFB+PIN

    CWDM DFB+ PIN

    EML+PIN

    CWDM DFB +PIN

    4x EML+SOA+PIN

    EML+SOA+PIN

    Operating Temperature

    0~70°C

    0~70°C

    0~70°C

    0~70°C

    -40~85°C (Available)

    0~70°C

    0~70°C

    -20~85°C (Available)

    0~70°C

    -40~85°C (Available)

     

    Questions & Answers

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    Customer Reviews

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    • ALL (17)
    • Premium Service (3)
    • Customer Support (2)
    • Excellent Quality (5)
    • Good Price (4)
    • Batch Order Discount (1)
    • Plug-and-Play (4)
    • High Reliability (4)
    • Compatibility (4)
    • High Performance (6)
    • Wilbur United States of America
      2026-02-28

      Installed a batch of 100G IR4 modules for connections between buildings on our campus, around 1–2km. Setup was simple and they came up right away on our switches. Power usage is reasonable and we haven't seen any packet loss or stability issues. For mid-range single-mode links, these have been a practical and cost-effective option for us.

      Transceivers typeQSFP-100G-CWDM4-S

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    • Sam United States of America
      2025-12-26

      We're using this 100G IR4 for a longer single-mode link in our campus network and it's been very reliable. Installation was straightforward, the link came up immediately, and performance has been consistent. It does exactly what we need without adding unnecessary complexity.

      Transceivers typeQSFP-100G-CWDM4-S

      CompatibleCisco

      Verified Purchase

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    • Sinclair United States of America
      2025-12-18

      Put this 100G IR4 in for a longer single-mode link between buildings and it just worked. No drama, no tweaking. Power levels looked fine and it's been stable since install. Did the job without forcing us into more expensive optics.

      Transceivers typeQSFP-100G-CWDM4-S

      CompatibleCisco

      Verified Purchase

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      0

    • Wilbur United States of America
      2025-12-12

      This 100G IR4 works exactly as expected. We're using it for short-to-mid distance links in our data center, and the performance has been rock-solid. No compatibility issues, clean signal, and great value for upgrading to 100G.

      Transceivers typeQSFP-100G-CWDM4-S

      CompatibleCisco

      Verified Purchase

      Helpful

      0

    • Baldwin United States of America
      2025-12-04

      We deployed several pairs of 100G IR4s in our campus interconnection project, covering a link of approximately 6 kilometers. The actual link performance was stable and highly sensitive, with a lower-than-expected bit error rate after deployment and excellent compatibility. If the delivery speed could be further improved, it would be even better.

      Transceivers typeQSFP-100G-CWDM4-S

      CompatibleCisco

      Verified Purchase

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      0

    • Brad United States of America
      2025-11-28

      Tried this 100G IR4 on a network upgrade project in SoCal, and it performed way better than expected. Clean signal, rock-steady 100G, and zero compatibility issues. Great value if you need mid-range 100G without overpaying.

      Transceivers typeQSFP-100G-CWDM4-S

      CompatibleCisco

      Verified Purchase

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    • Eliot United States of America
      2025-10-23

      I previously used it for data center room interconnection. It has excellent compatibility, plugs in and works instantly, and offers stable signal and low latency. The overall performance exceeded my expectations and I'm very satisfied.

      Transceivers typeQSFP-100G-CWDM4-S

      CompatibleCisco

      Verified Purchase

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      0

    • Calvin United States of America
      2025-07-11

      After comparing some websites, I found that QSFPTEK had the best price, but I was also worried about their product quality. After receiving the product and testing it, all my worries were gone. The product quality is excellent, the transmission is stable, and it is worth buying.

      Transceivers typeQSFP-100G-CWDM4-S

      CompatibleCisco

      Verified Purchase

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      0

    • Ameer Charles Taiwan
      2024-11-08

      I purchased 6x 100GBASE-CWDM4 optical modules, and 3x 100G NIC cards to upgrade the rates for my storage network. The modules were well packaged and not damaged in transit, a pretty good shopping experience.

      Transceivers typeQSFP-100G-CWDM4-S

      CompatibleCisco

      Verified Purchase

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    • Fabian United States of America
      2024-09-30

      The customer service, Wendy, was very helpful, I asked Wendy a lot of questions before purchasing and gave me the product parameters and discounts.

      Transceivers typeQSFP-100G-CWDM4-S

      CompatibleCisco

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    Resources

    • PDF Document
      QT-QSFP28-IR4 Datasheet.pdf
    • PDF Document
      Transceiver Module User Guide.pdf
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    Cisco QSFP-100G-CWDM4-S Compatible 100GBASE-CWDM4 QSFP28 1310nm 2km LC Duplex SMF DDM Optical Transceiver Module

    Compatible Cisco

    Transceivers type QSFP-100G-CWDM4-S

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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

    Helpful

    8

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    Cisco QSFP-100G-CWDM4-S Compatible 100GBASE-CWDM4 QSFP28 1310nm 2km LC Duplex SMF DDM Optical Transceiver Module
    US$ 83.90
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    Cisco QSFP-100G-CWDM4-S Compatible 100GBASE-CWDM4 QSFP28 1310nm 2km LC Duplex SMF DDM Optical Transceiver Module

    Compatible Cisco

    Transceivers type QSFP-100G-CWDM4-S

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