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Reliable 40G CSR4 module for extended MMF runs. Stable performance across our data hall.
QSFP-40G-CSR4
QSFP 4x10GBASE-SR Transceiver Module, MPO, 300M
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QSFP-40G-CSR4
QSFP 4x10GBASE-SR Transceiver Module, MPO, 300M
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QSFP-40G-CSR4 is a QSFP optical transceiver designed for high-performance 40G data transmission over fiber links. Built to support multi-protocol operation including Ethernet and Fibre Channel, this module is optimized for short-range applications in data centers, enterprise networks, and telecom environments.
QSFP-40G-CSR4 features a compact QSFP form factor with precise physical dimensions for easy integration into existing systems. It employs LC connectors and is engineered for use with multi-mode fiber to deliver up to 100 meters of reliable transmission, satisfying the stringent requirements of modern high-speed connectivity deployments.
QSFP-40G-CSR4 price is $636.00, a 82% saving from the Cisco list price of $3,534.00. QSFP-40G-CSR4 is in stock and available for next-day dispatch. (terms applied)
Request bulk order quote for QSFP-40G-CSR4 for additional pricing. Browse the full Cisco 40G Optical Modules series or explore all Cisco products.
To get the detailed certification, please go to the Compliance Center.
 QSFP-40G-CSR4 |  QSFP-40GE-LR4-S |  QSFP-40GE-LR4 |  CVR-CFP-4SFP10G= |  QSFP-40G-CSR-S= | |
|---|---|---|---|---|---|
| Compatibility | Cisco | Cisco, Juniper, Huawei, Arista | Cisco / Juniper / Huawei / Arista | N/A | Cisco / Juniper / Huawei / Arista |
| Connector Type | LC | LC | LC | LC | LC |
| Data Rate | 40G | 40G | 40G | 10G | 40G |
| Depth | 1.00 inches | N/A | N/A | N/A | 2.85 inches |
| Fiber Type | Multi-mode | Single-mode | Single-mode | N/A | Multi-mode |
| Form Factor | QSFP | QSFP | QSFP+ | CFP | QSFP |
| Height | 0.66 inches | N/A | N/A | N/A | 0.33 inches |
| Input Voltage | 3.3V | 3.3V | 3.3V | 3.3V | 3.3V |
| Max Distance | 100 meters | 10 km | 10 km | N/A | 100 meters |
| Network Interface | Fiber | Ethernet | Fiber | Ethernet | Fiber |
| Operating Temperature | 0 to 70°C | 0 to 70°C | 0 to 70°C | 0 to 70°C | 0 to 70°C |
| Power Consumption | 3.0W | 5.5W | 6.0 W | N/A | 3.5W |
| Product Name | QSFP-40G-CSR4 | QSFP-40GE-LR4-S | QSFP-40GE-LR4 | CVR-CFP-4SFP10G= | QSFP-40G-CSR-S= |
| Product Type | Transceiver | Transceiver | Transceiver | Transceiver | Transceiver |
| Storage Temperature | -40 to 85°C | -40 to 85°C | -40 to 85°C | -40 to 85°C | -40 to 85°C |
| Supported Protocols | Ethernet, Fibre Channel | Ethernet | Ethernet | Ethernet | Ethernet |
| Transmission Distance | Short-Range | Long-Range | Long-Range | Short-Range | Short-Range |
| Wavelength | 850nm | 1271/1294/1318/1341 nm | 1310 nm | N/A | 850nm |
| Weight | 0.1 lbs | N/A | N/A | N/A | 0.1 lbs |
| Width | 0.90 inches | N/A | N/A | N/A | 0.64 inches |
Reliable 40G CSR4 module for extended MMF runs. Stable performance across our data hall.
Clean MPO connectivity and consistent 4x10G aggregation.
Strong signal quality and dependable 300m reach over MMF.
Excellent short to mid-range 40G performance with no compatibility issues.
Stable throughput and easy integration into our switching fabric.
Ideal for dense rack deployments requiring reliable 40G links.
Consistent optical performance under heavy traffic conditions.
The QSFP-40G-CSR4 supports up to 300 meters over OM3 multimode fiber using an MPO connector.
The QSFP-40G-CSR4 delivers 40 Gbps aggregate throughput, splitting into four independent 10 Gbps channels.
The QSFP-40G-CSR4 requires OM3 or OM4 multimode fiber cables terminated with a 12-fiber MPO connector.
Yes. The QSFP-40G-CSR4 is fully hot-swappable, enabling seamless insertion and removal without powering down your switch or server.