QSFP-40G-SR4 – QSFP – 850nm 150m – Transceiver Modules

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QSFP-40G-SR4

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QSFP-40G-SR4 Description

QSFP-40G-SR4 is a Cisco 40GBASE-SR4 QSFP+ transceiver module, also known as "Cisco 40G QSFP+ SR4" or "QSFP+ 40G SR4 module." It is engineered for high-density, short-reach 40 Gigabit Ethernet connections in modern data centers and enterprise networks. Supporting up to 100 meters on OM3 and 150 meters on OM4/OM5 multimode fiber with MPO-12 connector, this module enables reliable 40G Ethernet aggregation or core links. It is fully compatible with IEEE 802.3ba 40GBASE-SR4 standards, supports both standard 40G links and 4x10G breakout mode for flexible network architecture, and provides digital diagnostics for advanced monitoring. Ideal for high-performance switching, spine-leaf topologies, or seamless 10G to 40G migration.

Product Highlights

Data Rate
Wavelength
Max. Distance

Key Features

  • Target Application: Versatile 40G environments requiring both Ethernet and storage connectivity, or flexible aggregation.
  • Scenario: Ideal for high-performance, short-reach connections where both 40G and 4x10G connectivity are needed, such as in ToR (Top-of-Rack) switch uplinks, spine-leaf architectures, or mixed environment migration.
  • Functional Highlights:
    • Supports 4x10G breakout mode, enabling connection to four 10G ports via an external MPO-to-duplex breakout cable—great for gradual migration from 10G to 40G.
    • FCoE (Fibre Channel over Ethernet) support, allowing for unified Ethernet and storage networking.
    • Interoperable with both 40G and 10G devices, making it extremely flexible for various network topologies.
  • Typical Users: Data centers or enterprises seeking maximum flexibility for both Ethernet and storage networks, with requirements for both aggregated and breakout deployments.

Applications Scenarios

Data Center Spine-Leaf Architecture

40G links between core and aggregation switches for high-throughput, low-latency connectivity.

Campus & Enterprise Backbone

Scalable backbone upgrades with support for both direct 40G and 4x10G breakout connectivity.

Server/Storage Aggregation

Consolidated high-speed connections for server, storage, and fabric aggregation in large enterprise environments.

Product comparison

Parameter

QSFP-40G-SR4

QSFP-40G-SR4-S

QSFP-40G-CSR4

Data Rate

40 Gbps

40 Gbps

40 Gbps

Wavelength

850 nm

850 nm

850 nm

Connector

MPO-12

MPO-12

MPO-12

Max Distance (OM3)

100m

100m

300m

Max Distance (OM4)

150m

150m

400m

Max Distance (OM5)

150m

150m

440m

4x10G Breakout

Yes

No

Yes

FCoE Support

Yes

No

Yes

Power Consumption

1.5W

1.5W

1.5W

Digital Diagnostics

Yes

Yes

Yes

Main Use Case

Standard SR4 & 4x10G

Ethernet SR4

Extended MMF reach

Platform Compatibility

Platform Type

Supported Series / Models

Nexus Switches

Nexus 9000, 7000, 5000, 6000, 3000, 2000 FEX

Catalyst Switches

Catalyst 9500, 9400, 9300, 9200, 6800, 3850, 3650

ASR Routers

ASR 9000, ASR 1000

CRS Routers

CRS Series

Storage Switches

MDS 9000 Series

Other Devices

UCS Fabric Interconnects, RF Gateway, SCE 8000

Safety & Compliance

This product meets the following standards and compliance requirements:

  • International Standards:
    • IEEE 802.3ba: Compliant with 40GBASE-SR4 Ethernet standards
    • QSFP+ MSA SFF-8436: Mechanical and electrical interface
    • RoHS 6: Fully RoHS-compliant for environmental safety
  • Laser Safety:
    • Class 1 Laser Product (IEC 60825-1, 21CFR-1040)
  • Electrical Safety:
    • UL E116441 certified cable jacket
  • Other Compliance:
    • ELV and WEEE (Electronic waste and recycling regulations)
    • Cisco Takeback and Reuse Program participation

Installation & Usage Tips

  • Connector Requirements:
    Use MPO-12 (female) connectors with PC or UPC polish. APC connectors are not supported.
  • Fiber Compatibility:
    Use OM3 multimode fiber for up to 100m, or OM4/OM5 for up to 150m reach.
  • 4x10G Breakout:
    Supports 4x10G breakout with the correct MPO-to-LC breakout cable and compatible SFP+ ports.
  • Hot-Swappable:
    Module can be inserted or removed while the device is powered on.
  • Installation Guide:
    1. Wear an ESD wrist strap and ground yourself.
    2. Clean MPO connectors before installation.
    3. Insert the module gently into the QSFP+ port until locked.
    4. Connect the fiber patch cable securely.
    5. Verify link status via system diagnostics or DOM.
  • Removal:
    Lower the bail latch, gently pull out the module, and cover unused ports with dust caps.
  • Maintenance:
    Keep connectors clean. If link issues occur, check fiber type, connector condition, and avoid bending cables too tightly.
  • Operating Temperature:
    0°C to 70°C (32°F to 158°F)
    Storage: -40°C to 85°C

Specifications

Parameter Detail Parameter Detail
Form Factor QSFP+ Data Rate 40 Gbps
Wavelength 850 nm Cable Type OM3/OM4/OM5 MMF
Connector MPO-12 Max Distance (OM3/OM4/OM5) 100m / 150m / 150m
4x10G Breakout Supported FCoE Support Yes
Digital Diagnostics Yes (DOM) Power Consumption 1.5W
Operating Temperature 0°C to 70°C Compliance IEEE 802.3ba, QSFP+ MSA SFF-8436, RoHS 6
Dimensions (HxWxD) 13.5 x 18.4 x 72.4 mm Weight <100g
 Laser Safety Class 1 (IEC 60825-1)

Get More Information

Discover unbeatable prices and fast shipping for the QSFP-40G-SR4 Access the detailed QSFP-40G-SR4 datasheet and ensure you’re getting the best deal with our reliable delivery service. Need assistance? Our free live chat support is here to help. For more information about the product and pricing, contact us via Live chat or email us at [email protected]

Quality Certifications

Customer Reviews

Write A Review
5.0
(4 reviews)
5 Stars
4
4 Stars
0
3 Stars
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2 Stars
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1 Stars
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    IT Manager
    Posted on 02/10/2024
    Verified Buyer
    5.0

    Good price/performance. Packaging was secure.

    Avery Johnson
    Posted on 15/05/2024
    Verified Buyer
    5.0

    Send me out… with a bang. Or just good bandwidth. Delivered fast.

    Data Center Ops
    Posted on 10/02/2024
    Verified Buyer
    5.0

    Standard 40G optics. We needed MPO connectors and these were in stock. Fast ship.

    Dr. Halsey
    Posted on 20/12/2023
    Verified Buyer
    5.0

    Required for the Spartan program… I mean server upgrade. Exact specifications met.

Questions & Answers

  • What is Cisco QSFP-40G-SR4 used for?

    Cisco QSFP-40G-SR4 is a 40G short-reach optical transceiver for multimode fiber. It uses four parallel lanes over MPO/MTP connectors and is ideal for leaf-spine fabrics, server aggregation, and high-throughput campus cores.

  • How far can QSFP-40G-SR4 transmit on OM3 or OM4?

    Typical reach is up to ~100 m on OM3 and ~150 m on OM4, depending on fiber quality and loss budget. For longer distances, consider LR4/ER4 or CWDM4 standards instead of SR4 modules.

  • Does QSFP-40G-SR4 support 4x10G breakout?

    Yes. With an MPO-to-LC breakout harness and switch support, QSFP-40G-SR4 can present four independent 10G links. This is useful for migrating from 10G servers to a 40G spine without replacing NICs immediately.

  • Which connector type does QSFP-40G-SR4 require?

    It uses 12-fiber MPO/MTP connectors. Ensure proper polarity (Type-B) and clean connectors before insertion. Contamination significantly increases bit errors on parallel-optic modules like SR4.

  • QSFP-40G-SR4 vs QSFP-40G-LR4—what’s the difference?

    SR4 is multimode and short-reach using parallel optics; LR4 is single-mode, multiplexing four wavelengths for up to 10 km. Choose SR4 for in-rack/row, LR4 for building-to-building or long risers.

  • Can I mix QSFP-40G-SR4 with third-party optics?

    Interoperability depends on vendor implementation. For best support and consistent DOM readings, match SR4 transceivers from the same vendor on both ends, and validate in a lab before production.

  • What fiber hygiene practices matter for SR4 modules?

    Always clean MPO endfaces with approved tools, inspect under a scope, cap when not in use, and avoid excessive mating cycles. Poor hygiene is the top cause of CRC and light-level issues.

  • Does QSFP-40G-SR4 support DOM/diagnostics?

    Most Cisco SR4 modules provide Digital Optical Monitoring, exposing TX/RX power, temperature, and voltage. Monitor thresholds and set alerts to detect dirty connectors or failing channels early.

  • What cabling do I need for breakout?

    Use MPO-to-4xLC duplex breakout cables rated for 40G parallel optics. Verify polarity and length. Ensure the switch is configured for 4x10G breakout on the selected QSFP port group.

  • How to troubleshoot high errors on SR4 links?

    Check fiber polarity, clean connectors, verify OM3/OM4 grade, measure DOM levels, reseat modules, and test each lane. Replace damaged harnesses; parallel lanes mean one bad fiber can degrade the entire 40G link.

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