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Reliable 40G CSR4 module providing stable 300m MMF connectivity.
QSFP-40G-CSR4=
4X10GBASE-SR QSFP TRANSCEIVER MODULE MPO 300M
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Name:
QSFP-40G-CSR4=
- Description:
- 4X10GBASE-SR QSFP TRANSCEIVER MODULE MPO 300M
- Rating:
Added to cart 28 times recently
- Availability:
In stock - Ready to Ship
- Brand:
- Cisco
- GTIN:
- 821455070031
- Condition:
- Warranty:
- 3
- List Price:
$3,534.00
- Price:
$629.0082.2% off
Quantity:
1
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QSFP-40G-CSR4= Overview
QSFP-40G-CSR4= is a QSFP transceiver that delivers a 40G data rate, designed specifically for short-range applications with multi-mode fiber connectivity. The module features LC connectors and is engineered to support Ethernet protocols, making it ideal for high-density data centers, enterprise networks, and telecom environments.
This transceiver is built in a compact QSFP form factor with dimensions intended to meet industry standards for hot-pluggable optical modules. It supports robust carrier-grade networking applications by ensuring reliable, high-speed transmission over short distances, and is optimized for use in environments where performance and compatibility with Cisco systems are critical.
QSFP-40G-CSR4= price is $629.00, a 82.2% 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.
QSFP-40G-CSR4= Specifications
- Product Type
- Transceiver
- Form Factor
- QSFP
- Data Rate
- 40G
- Connector Type
- LC
- Wavelength
- 850 nm
- Transmission Distance
- Short-Range
- Fiber Type
- Multi-mode
- Max Distance
- 100 m
- Supported Protocols
- Ethernet
- Network Interface
- Ethernet
- Power Consumption
- N/A
- Operating Temperature
- 0 to 70°C
- Storage Temperature
- -40 to 85°C
- Input Voltage
- 3.3V
- Compatibility
- Cisco
- Product Name
- QSFP-40G-CSR4=
- Height
- N/A
- Width
- N/A
- Depth
- N/A
- Weight
- N/A
Quality Certifications
To get the detailed certification, please go to the Compliance Center.
Product Comparison Table 
| QSFP-40G-CSR4= |  QSFP-40GE-LR4-S |  CVR-CFP-4SFP10G= |  QSFP-40G-BD-RX= |  QSFP-40G-LR4-S= | |
|---|---|---|---|---|---|
| Compatibility | Cisco | Cisco, Juniper, Huawei, Arista | N/A | Cisco / Juniper / Huawei / Arista | Cisco / Juniper / Huawei / Arista |
| Connector Type | LC | LC | LC | LC | LC |
| Data Rate | 40G | 40G | 10G | 40G | 40G |
| Depth | N/A | N/A | N/A | N/A | N/A |
| Fiber Type | Multi-mode | Single-mode | N/A | Multi-mode | Single-mode |
| Form Factor | QSFP | QSFP | CFP | QSFP | QSFP |
| Height | N/A | N/A | N/A | N/A | N/A |
| Input Voltage | 3.3V | 3.3V | 3.3V | 3.3V | 3.3V |
| Max Distance | 100 m | 10 km | N/A | 100 meters | 10 km |
| Network Interface | Ethernet | Ethernet | Ethernet | Fiber | Ethernet |
| Operating Temperature | 0 to 70°C | 0 to 70°C | 0 to 70°C | 0 to 70°C | 0 to 70°C |
| Power Consumption | N/A | 5.5W | N/A | N/A | N/A |
| Product Name | QSFP-40G-CSR4= | QSFP-40GE-LR4-S | CVR-CFP-4SFP10G= | QSFP-40G-BD-RX= | QSFP-40G-LR4-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 | Ethernet | Ethernet | Ethernet | Ethernet |
| Transmission Distance | Short-Range | Long-Range | Short-Range | Short-Range | Long-Range |
| Wavelength | 850 nm | 1271/1294/1318/1341 nm | N/A | 850nm | 1310 nm |
| Weight | N/A | N/A | N/A | N/A | N/A |
| Width | N/A | N/A | N/A | N/A | N/A |
Reviews & Ratings
T
Tanner Brooks
5
Consistent MPO performance across data hall links.
U
Umar King
5
Maintained steady 4x10G aggregation under load.
V
Victor Cruz
5
Excellent short-range 40G solution for dense racks.
W
Wyatt Price
4
Strong signal integrity and dependable throughput.
X
Xavier Reed
5
Easy deployment and reliable optical stability.
Z
Zach Brooks
4
Solid CSR4 performance meeting enterprise standards.
Questions & Answers
What is QSFP-40G-CSR4= and what does it do?
The QSFP-40G-CSR4= is a 40 Gbps QSFP transceiver module that aggregates four 10 Gbps channels using 4×10GBASE-SR optics and an MPO connector, enabling high-density, short-reach data center links up to 300 meters over OM3 fiber.
What data rate and wavelength does the QSFP-40G-CSR4= support?
This module supports a total data rate of 40 Gbps via four 10 Gbps channels at a nominal wavelength of 850 nm, optimized for multimode fiber transmission.
Which fiber types and link distances are compatible?
The QSFP-40G-CSR4= is compatible with OM3 and OM4 multimode fibers, supporting up to 300 meters on OM3 and up to 400 meters on OM4 when properly certified.
What connector type does this transceiver use?
It uses a standard MPO/MTP™ 12-fiber female connector for the 4×10GBASE-SR channels, simplifying high-density fiber routing.
Which network devices support the QSFP-40G-CSR4=?
This module is compatible with any QSFP-enabled switch, router or network interface card that supports 40 Gbps SR4 optics, including major brands like Cisco, Arista, Juniper and Huawei.
Can I use the QSFP-40G-CSR4= with a breakout cable?
Yes. When paired with a 40G-to-4×10G MPO-to-LC breakout cable, the QSFP-40G-CSR4= can split into four independent 10 Gbps SR links for flexible connectivity.
How do I install the QSFP-40G-CSR4= transceiver?
Hot-plug the QSFP-40G-CSR4= into a compatible QSFP port, connect the MPO cable, then verify link status via your switch or host adapter’s management interface.
What is the typical power consumption?
The QSFP-40G-CSR4= has a maximum power draw of 1.5 Watts, meeting standard QSFP+ power budgets for efficient data center operation.
Does this module support Digital Diagnostics Monitoring (DDM)?
Yes. It offers real-time DDM for parameters like optical output power, receive power, temperature, laser bias current and supply voltage via the I²C interface.
What operating temperature range does the QSFP-40G-CSR4= cover?
This transceiver operates reliably in the industrial range from 0 °C to 70 °C (32 °F to 158 °F) for data center and enterprise environments.
What is the mean time between failures (MTBF)?
The QSFP-40G-CSR4= boasts an MTBF exceeding 1,000,000 hours, ensuring high availability for mission-critical connectivity.
Can I use QSFP-40G-CSR4= in CWDM or DWDM networks?
No. This module uses multimode 850 nm SR optics and is not designed for CWDM or DWDM single-mode fiber applications.
How does the QSFP-40G-CSR4= differ from a standard QSFP+ SR transceiver?
The CSR4 variant uses an MPO connector and four independent 10 Gbps channels for short-reach multimode links, whereas QSFP+ SR typically uses duplex LC connectors for a single 40 Gbps channel.
What warranty and support are provided?
Most vendors offer a lifetime advance-replacement warranty and free technical support for the QSFP-40G-CSR4=, ensuring rapid issue resolution.
How can I troubleshoot link problems with this module?
Verify proper MPO connector polarity, ensure fiber cleanliness, check DDM diagnostics for power and temperature thresholds, and confirm firmware compatibility on host devices.
Is the QSFP-40G-CSR4= RoHS compliant?
Yes. The module meets RoHS 6/6 standards, ensuring it is free from hazardous substances such as lead, mercury and cadmium.
What applications are ideal for this transceiver?
The QSFP-40G-CSR4= is ideal for high-density data center spine-and-leaf architectures, HPC clusters and server interconnects requiring cost-effective, short-reach optics.