Cisco QSFP-40G-SR4 40GBASE Transceiver Module Specifications
| Specification | Details |
|---|
| Brand | Cisco |
| Part Number | QSFP-40G-SR4 |
| Product Type | QSFP+ Transceiver Module |
| Data Rate | 40Gbps |
| Ethernet Standard | 40GBASE-SR4 |
| Form Factor | QSFP+ |
| Connector Type | MPO/MTP-12 |
| Fiber Type | Multimode Fiber (MMF) |
| Wavelength | 850 nm |
| Maximum Transmission Distance | Up to 100m on OM3 / 150m on OM4 |
| Interface | 40 Gigabit Ethernet |
| Optical Technology | VCSEL |
| Number of Fibers | 8 fibers (4 transmit + 4 receive) |
| Duplex | Parallel Optical |
| Hot-Swappable | Yes |
| Digital Optical Monitoring (DOM) | Yes |
| Operating Temperature | 0°C to 70°C |
| Application | Data Center, High-Speed Ethernet, Server & Network Connectivity |
| Compatible Network Equipment | Cisco switches, routers and compatible QSFP+ platforms |
| Typical Use | 40GbE switch-to-switch and switch-to-server connections |
Cisco QSFP-40G-SR4 40GBASE Transceiver Module
The Cisco QSFP-40G-SR4 40GBASE Transceiver Module is a high-speed optical networking solution designed for compatible Cisco switches, routers, and data center networking equipment. It provides 40 Gigabit Ethernet connectivity over multimode fiber and is designed for short-range, high-bandwidth network connections within enterprise and data center environments.
The Cisco QSFP-40G-SR4 uses a 4-lane, 850nm optical architecture and an MPO/MTP multifiber connector interface. It supports up to 30 meters over OM2, 100 meters over OM3, and 150 meters over OM4/OM5 multimode fiber, making it suitable for high-speed connections between switches and other network devices in the same data center or facility.
High-Speed 40GBASE-SR4 Optical Connectivity
The Cisco QSFP-40G-SR4 is designed to deliver a total 40Gbps Ethernet connection using four parallel optical lanes. Each lane operates at approximately 10Gbps, allowing the module to provide high-bandwidth connectivity for data center network traffic.
Its 850nm multimode fiber technology is optimized for short-distance 40GbE applications where high throughput and efficient rack-to-rack or switch-to-switch connectivity are required.
OM2, OM3 and OM4/OM5 Multimode Fiber Support
One of the key advantages of the Cisco QSFP-40G-SR4 is its compatibility with different grades of multimode fiber.
The supported distances are:
- OM2: Up to 30 meters
- OM3: Up to 100 meters
- OM4/OM5: Up to 150 meters
These distances are based on Cisco's published specifications for the QSFP-40G-SR4 module.
For modern data center deployments, OM3 and OM4 multimode fiber can provide the longer reach required for connecting equipment across racks and network distribution areas.
MPO/MTP Fiber Connector
The Cisco QSFP-40G-SR4 uses a 12-fiber MPO/MTP female connector for its parallel optical interface. This connector design allows multiple optical lanes to be carried through a single compact fiber connection, making it well suited for high-density data center cabling.
When installing the module, the correct MPO/MTP fiber polarity, fiber type, and connector configuration should be verified to ensure proper optical connectivity.
4x10G Breakout Capability
In addition to native 40GbE connectivity, the Cisco QSFP-40G-SR4 can be used in a 4x10G breakout configuration with appropriate parallel-to-duplex fiber breakout cabling. This allows one compatible 40Gb QSFP+ interface to connect to four 10Gb interfaces.
This feature can be useful when upgrading an existing network gradually—for example, connecting a 40Gb-capable data center switch to multiple 10Gb network interfaces.
Why Choose Cisco QSFP-40G-SR4?
The Cisco QSFP-40G-SR4 is a practical choice when you need a 40Gbps multimode fiber transceiver for a compatible Cisco networking platform.
Key benefits include:
- 40Gbps high-speed Ethernet connectivity
- 40GBASE-SR4 optical standard
- 850nm multimode fiber technology
- Up to 150m reach on OM4/OM5
- MPO/MTP multifiber connector
- 4-lane parallel optical architecture
- 4x10G breakout capability
- Suitable for compatible Cisco data center switches and networking equipment
- Compact QSFP+ form factor
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