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QSFP-40G-CSR-S
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40GBASE-CSR QSFP TRANSCEIVER MO W/LC CONNECTOR
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Hand-picked by our procurement team for standout value. This unit is offered at our sharpest price on current stock, verified against live market rates.
Name:
QSFP-40G-CSR-S
- Description:
- 40GBASE-CSR QSFP TRANSCEIVER MO W/LC CONNECTOR
- Rating:
Added to cart 28 times recently
- Availability:
2 In stock - Ready to Ship
- Brand:
- Cisco
- GTIN:
- 0821456045076
- Condition:
Certified Refurbished
Professionally inspected, bench-tested, and firmware-verified, with configurations wiped. Restored to full working order and backed by our warranty.
- Warranty:
- 3
- List Price:
$2,354.00
- Price:
$747.0068.3% off
Quantity:
1
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QSFP-40G-CSR-S Overview
QSFP-40G-CSR-S is a QSFP transceiver module engineered for 40G Ethernet connectivity in high-density data center and enterprise network environments. It is designed to operate over multi-mode fiber using LC connectors and an 850nm wavelength, enabling short-range transmission up to 100 meters while supporting Ethernet protocols.
QSFP-40G-CSR-S features a compact QSFP form factor with dimensions optimized for rack-mounted equipment, ensuring seamless integration into modern telecom infrastructures. The module’s reliable performance, controlled power consumption, and wide operating temperature range make it ideal for network upgrades and critical applications in data centers and telecom systems.
QSFP-40G-CSR-S price is $747.00, a 68.3% saving from the Cisco list price of $2,354.00. QSFP-40G-CSR-S is in stock and available for next-day dispatch. (terms applied)
Request bulk order quote for QSFP-40G-CSR-S for additional pricing. Browse the full Cisco 40G Optical Modules series or explore all Cisco products.
QSFP-40G-CSR-S Specifications
- Product Type
- Transceiver
- Brand
- Cisco
- Form Factor
- QSFP
- Data Rate
- 40G
- Connector Type
- LC
- Wavelength
- 850nm
- Transmission Distance
- Short-Range
- Fiber Type
- Multi-mode
- Max Distance
- 100 meters
- Supported Protocols
- Ethernet
- Network Interface
- Fiber
- Power Consumption
- 3.5W
- Operating Temperature
- 0 to 70°C
- Storage Temperature
- -40 to 85°C
- Input Voltage
- 3.3V
- Compatibility
- Cisco / Juniper / Huawei / Arista
- Product Name
- QSFP-40G-CSR-S
- Height
- 0.33 inches
- Width
- 0.64 inches
- Depth
- 2.85 inches
- Weight
- 0.1 lbs
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Product Comparison Table 
| QSFP-40G-CSR-S |  CFP-40G-SR4 |  CFP-40G-LR4 | |
|---|---|---|---|
| Product Type | Transceiver | Transceiver | Transceiver |
| Form Factor | QSFP | CFP | CFP |
| Data Rate | 40G | 40G | 40G |
| Connector Type | LC | LC | LC |
| Wavelength | 850nm | 850 nm | 1310nm |
| Transmission Distance | Short-Range | Short-Range | Long-Range |
| Fiber Type | Multi-mode | Multi-mode | Single-mode |
| Max Distance | 100 meters | 100 m | 10 km |
| Supported Protocols | Ethernet | Ethernet | Ethernet, Fibre Channel |
| Network Interface | Fiber | Fiber | Ethernet |
| Power Consumption | 3.5W | 6.5W | 5.0W |
| Operating Temperature | 0 to 70°C | 0 to 70°C | 0 to 70°C |
| Storage Temperature | -40 to 85°C | -40 to 85°C | -40 to 85°C |
| Input Voltage | 3.3V | 3.3V | 3.3V |
| Compatibility | Cisco / Juniper / Huawei / Arista | Cisco, Juniper, Huawei, Arista | Cisco, Juniper, Huawei, Arista |
| Product Name | QSFP-40G-CSR-S | CFP-40G-SR4 | CFP-40G-LR4 |
Compliance & Warranty
100% Genuine Product Guarantee
Every unit is authentic, sourced through trusted and authorised channels, and serial-verified on request. Genuine networking and IT hardware, guaranteed, or your money back.
Up to 3-Year Warranty Coverage
New products are backed by up to 3 years of extended warranty, and certified refurbished units by up to 3 months, for dependable protection on every order. Coverage is clear, honoured in full, and confirmed on each product page.
Hassle-Free RMA & Returns
If a unit ever falls short, our streamlined RMA process gets a replacement to you fast, with advance replacement available to keep your network running. No jargon, no runaround.
Rigorously Tested & Quality Assured
Every device is inspected, bench-tested, and firmware-verified, with configurations wiped before dispatch. Additional testing can be arranged to confirm full working condition on request.
Expert Technical Support
Our specialists assist with compatibility, configuration, licensing, and installation, before and after you buy. Real hardware expertise, whenever you need it.
Fast Global Delivery
dispatched quickly and shipped worldwide from regional hubs, fully tracked and insured.
Reviews & Ratings
K
Kevin Wallace
5
Reliable 40G CSR transceiver delivering stable 300m MMF connectivity.
L
Liam Ross
5
Consistent performance in high-density rack deployments.
M
Mason Holt
5
Maintained steady bandwidth during peak operations.
N
Nathan Bennett
4
Strong optical stability and easy integration.
O
Owen Wallace
5
Dependable short-range 40G solution.
P
Peyton Ross
5
Smooth deployment and predictable throughput.
Q
Quinn Holt
5
Excellent CSR optics for enterprise use.
Questions & Answers
What is the QSFP-40G-CSR-S 40GBASE-CSR QSFP transceiver with LC connector?
The QSFP-40G-CSR-S is a 40Gbps 4-lane parallel multimode fiber transceiver with LC duplex connectors, designed for short-reach data center and enterprise applications.
What maximum distance does the QSFP-40G-CSR-S support over multimode fiber?
The QSFP-40G-CSR-S supports up to 100 meters over OM4 multimode fiber and 70 meters over OM3 fiber at 40Gbps.
Is the QSFP-40G-CSR-S compatible with Cisco and other major network switches?
Yes, the QSFP-40G-CSR-S is fully compliant with Cisco MSA and works seamlessly with Brocade, Juniper, Arista, HPE, Dell and other leading switch vendors.
Which fiber type does the QSFP-40G-CSR-S require?
This QSFP transceiver requires OM3 or OM4 multimode fiber cables terminated with LC duplex connectors.
What data rate does the QSFP-40G-CSR-S support?
The QSFP-40G-CSR-S supports a per-lane data rate of 10.3125Gbps, delivering a total aggregated throughput of 40Gbps.
Does the QSFP-40G-CSR-S support digital diagnostics monitoring (DDM/DOM)?
Yes, it features full digital diagnostics monitoring for real-time tracking of optical power, voltage, temperature and laser bias current.
What is the power consumption of the QSFP-40G-CSR-S?
Typical power consumption for the QSFP-40G-CSR-S is 1.5W, ensuring energy-efficient operation in high-density deployments.
Is the QSFP-40G-CSR-S hot-swappable?
Yes, the QSFP-40G-CSR-S is fully hot-swappable for easy field replacement without powering down the host device.
What operating temperature range does the QSFP-40G-CSR-S transceiver support?
The QSFP-40G-CSR-S operates reliably between 0°C to 70°C (32°F to 158°F) ambient temperature.
What connector type does the QSFP-40G-CSR-S use?
This transceiver uses industry-standard LC duplex connectors for compatibility with multimode fiber patch panels and cables.
Is the QSFP-40G-CSR-S compliant with MSA standards?
Yes, the QSFP-40G-CSR-S meets QSFP+ MSA specifications, ensuring interoperability across multiple vendors.
How do I install the QSFP-40G-CSR-S in my network switch?
Align the module with the switch port, insert gently until it clicks, and secure the module; then connect LC patch cables to complete installation.
Can the QSFP-40G-CSR-S be used in breakout applications?
Yes, with a 1x4 breakout cable or adapter, you can split the QSFP-40G-CSR-S into four simultaneous 10Gbps SFP+ links.
What warranty is offered for the QSFP-40G-CSR-S transceiver?
We offer a lifetime warranty and free technical support for the QSFP-40G-CSR-S against manufacturing defects.
How does the QSFP-40G-CSR-S compare to SR and LR QSFP transceivers?
Unlike SR (Short Reach) or LR (Long Reach), the CSR variant optimizes cost and distance for campus and data center links up to 100m on OM4.
What are the MTBF and reliability specs of the QSFP-40G-CSR-S?
The QSFP-40G-CSR-S has an MTBF exceeding 1,000,000 hours and meets Telcordia GR-468-CORE reliability standards.