Name: Cisco QSFP-40G-CSR4 MPO Multi-Mode QSFP+ Transceiver 40 Gbps
Brand: Cisco
SKU: QSFP-40G-CSR4
Price: 39.00 USD
Availability: InStock
Rating: 4.8 (114 reviews)

Product Overview
The QSFP-40G-CSR4 Cisco transceiver offers 40 Gigabit Ethernet connectivity over multimode fiber using MPO connectors. It fits into QSFP+ ports and is built for short-range links up to 100 meters, making it well suited for data center and enterprise networks looking to balance speed and reach on multimode infrastructure.

General Information
Brand	Cisco
Part Number	QSFP-40G-CSR4

Technical Information
Form Factor	QSFP+
Media	MMF
Type	VCSEL
Power Consumption	Typical 1.5 W, Max 2.5 W
Protocols	40GBASE-SR4, IEEE 802.3ba (40G Ethernet)
Connector	MTP/MPO
DOM Support	Yes

Physical Characteristics
Weight	5.00
Condition	Refurbished

Product Description
The QSFP-40G-CSR4 is a high-speed transceiver designed to handle 40 Gigabit Ethernet connections over multimode fiber. It’s often found in data centers and enterprise networks where high bandwidth and short reach are needed. Built for Cisco network devices, this transceiver fits easily into QSFP+ slots, providing reliable performance for server interconnects and switch uplinks. Network engineers and IT professionals rely on it for dense, high-speed fiber connections. Key Features Supports 40 Gbps Ethernet speeds over OM3 and OM4 multimode fiber Uses MPO connector for quick and efficient cabling Operates over distances up to 100 meters on OM3 fiber Complies with IEEE 802.3ba and Cisco specifications Hot-swappable for easy installation and maintenance This transceiver is typically deployed in data centers connecting switches and servers within racks or across short distances in campus environments. It allows organizations to maintain high throughput while keeping cabling manageable and cost-effective. Its role in modern networks is crucial for handling growing data traffic without the complexity of longer reach transceivers.

Use Cases
The Cisco QSFP-40G-CSR4 transceiver is commonly deployed in data center environments where short-range, high-speed connections over multimode fiber are essential. IT teams managing server-to-switch or switch-to-switch links in campus networks benefit from its balance of performance and reach within multimode fiber infrastructures. How It's Used: Interconnecting top-of-rack switches in data centers to support virtualization and cloud workloads. Extending 40 Gigabit Ethernet connectivity across enterprise campus backbone fiber runs under 100 meters. Enabling high-speed aggregation between storage clusters requiring low-latency multimode fiber links. Supporting network fabrics in high-performance computing (HPC) environments with dense rack deployments. Facilitating short-reach uplinks in SMB networks upgrading to 40G infrastructure without replacing multimode cabling. This transceiver optimizes network scalability and operational efficiency by utilizing existing multimode fiber infrastructure while delivering 40G throughput. Its compatibility with Cisco QSFP+ ports ensures seamless integration into complex network topologies requiring reliable, short-range high-bandwidth links.

Tech Atlantix

Cisco QSFP-40G-CSR4 MPO Multi-Mode QSFP+ Transceiver 40 Gbps

QSFP-40G-CSR4

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