What is qsfp dd
Last updated: April 1, 2026
Key Facts
- QSFP DD is an evolution of QSFP28, offering double the port density in the same footprint
- Supports data rates up to 400 Gbps, making it ideal for next-generation data center switches
- Uses 8 channels of 50 Gbps each, compared to QSFP28's 4 channels of 100 Gbps
- Backward compatible with QSFP28 cages through adapter options in some implementations
- Widely adopted by major networking equipment manufacturers for high-performance switches and routers
Overview
QSFP DD (Quad Small Form-factor Pluggable Double Density) represents the latest evolution in high-speed optical transceiver technology for data center networking. It combines the compact form factor advantages of QSFP technology with increased port density to support the growing bandwidth requirements of modern cloud infrastructure.
Technical Specifications
QSFP DD is designed to support 400 Gigabit Ethernet (400GbE) transmission. Each module features 8 channels that can each transmit at 50 Gbps, totaling 400 Gbps per port. The physical dimensions are similar to QSFP28 modules, allowing high density port configurations in switch lineups.
Key Features
- Port Density: Double the density of QSFP28, allowing more ports per switch in the same physical space
- Speed: Supports 400 Gbps per channel, meeting the demands of hyperscale data centers
- Power Efficiency: Designed with power consumption considerations for large-scale deployments
- Multi-Protocol Support: Can support various protocols including 400GBASE-DR4, 400GBASE-FR4, and others
Applications
QSFP DD transceivers are primarily used in high-performance data center switches, routers, and storage systems. They are essential for connecting core networking infrastructure in cloud providers, hyperscale data centers, and service provider networks requiring extremely high bandwidth interconnects.
Comparison with Other Formats
While QSFP28 supports 100 Gbps per channel, QSFP DD doubles this to 50 Gbps per channel across 8 lanes. Other competing formats include CFP8, which supports 400 Gbps but with larger physical dimensions. QSFP DD's advantage is maintaining a small form factor while supporting 400 Gbps speeds.
Related Questions
What is QSFP28?
QSFP28 is an earlier generation form factor that supports 100 Gbps speeds with 4 channels of 25 Gbps each. It was widely adopted before QSFP DD became available for 400 Gbps networking needs.
What is SFP+ and how does it differ from QSFP DD?
SFP+ is an older, smaller form factor supporting 10 Gbps speeds with a single channel. QSFP DD is significantly faster and denser, designed for modern data center requirements.
What are the cooling requirements for QSFP DD modules?
QSFP DD modules require proper airflow and cooling in high-density deployments. Most data center switches provide integrated cooling solutions to manage heat from multiple 400 Gbps modules.
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Sources
- Wikipedia - Quad Small Form-factor Pluggable CC-BY-SA-4.0