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ProductsCisco QSFP-40G-SR4-S= 40GBASE-SR4 QSFP+ Optical Transceiver
QSFP-40G-SR4-S=2
QSFP-40G-SR4-S=2
QSFP-40G-SR4-S=
CISCO Modules

Cisco QSFP-40G-SR4-S= 40GBASE-SR4 QSFP+ Optical Transceiver

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🚀 40G Data Center High-Density Solution | Cisco QSFP-40G-SR4-S=

Enable High-Speed 40G Connectivity with Scalable MPO Architecture

The Cisco QSFP-40G-SR4-S= is a high-performance 40GBASE-SR4 QSFP+ optical transceiver designed for short-reach, high-density data center connectivity over multimode fiber.
Operating at 850nm and using MPO-12 interface (4 Tx + 4 Rx channels), it supports transmission distances of up to 100 meters (OM3) and 150 meters (OM4), making it ideal for modern data centers requiring high bandwidth and efficient cabling.
Engineered by Cisco Systems, this module ensures reliable performance and seamless integration with Cisco networking platforms.


🔥 Why 40G Still Matters

✔ Need higher bandwidth than 10G but lower cost than 100G? ✔ Running aggregation or spine layers? ✔ Looking for high-density MPO-based cabling?
👉 40G remains a cost-effective solution for many data centers.


⚡ Why QSFP-40G-SR4-S=?

  • 4x10G parallel transmission (40G total bandwidth)
  • MPO fiber reduces cable congestion
  • Ideal for leaf-spine and aggregation layers
  • Lower cost per port compared to multiple 10G links
  • Widely used in enterprise & cloud data centers


🧠 Key Features

  • Data Rate: 40 Gbps
  • Technology: 4 × 10G parallel lanes
  • Wavelength: 850 nm
  • Distance:
  • 100 m (OM3)
  • 150 m (OM4)
  • Connector: MPO-12
  • Fiber Type: Multimode fiber (MMF)
  • Form Factor: QSFP+
  • Digital Optical Monitoring (DOM): Supported
  • Hot-swappable
  • Fully optimized for Cisco platforms


🏗️ Typical Use Cases

1. Spine Switch Connectivity

  • High-bandwidth aggregation layer
  • Supports east-west traffic

2. Data Center Backbone

  • 40G inter-switch connections
  • Reduces number of required ports

3. High-Density Environments

  • MPO cabling simplifies large deployments
  • Ideal for hyperscale racks

4. Breakout Applications (40G → 4×10G)

  • Can be used with breakout cables
  • Connect to multiple 10G devices


🧩 Complete 40G Solution

✅ Optical Modules

  • Cisco QSFP-40G-SR4-S=
  • Cisco QSFP-40G-LR4-S= (for long distance)

✅ Cabling (Very Important for Conversion)

  • MPO-12 trunk cables
  • MPO to LC breakout cables (40G → 4x10G)

✅ Network Equipment

  • 40G switches (spine/core)
  • 10G/40G hybrid environments
👉 MPO ecosystem = higher project value + more upsell机会


📊 Technical Specifications

Parameter
Specification
Form Factor
QSFP+
Data Rate
40 Gbps
Standard
40GBASE-SR4
Wavelength
850 nm
Max Distance
100 m (OM3) / 150 m (OM4)
Connector
MPO-12
Fiber Type
Multimode
Tx Power
-7.6 ~ 2.4 dBm
Rx Sensitivity
≤ -9.5 dBm
Power Supply
3.3V
Operating Temp
0°C to +70°C
DOM Support
Yes
Compliance
IEEE 802.3ba, QSFP+ MSA, RoHS


❓ FAQ

Q1: What fiber is required for QSFP-40G-SR4-S=?

MPO-12 multimode fiber (OM3 or OM4) is required.


Q2: Can it be used for breakout to 10G?

Yes, it supports 40G to 4×10G breakout using MPO-LC cables.


Q3: What is the maximum transmission distance?

Up to 100m (OM3) and 150m (OM4).


Q4: Is this suitable for high-density data centers?

Yes, MPO-based architecture is ideal for high-density environments.


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🚀 Get a Quote for Your 40G Deployment

👉 Planning a 40G data center upgrade?
  • ✔ Fast delivery
  • ✔ Stable supply
  • ✔ Project support
Contact us today for pricing and availability.