Certified Carrier-Grade Router QSFP-DD

QSFP-DD (Quad Small Form-Factor Pluggable Double Density) modules deliver 400G and 800G high-density connectivity for carrier-grade routers and data center networks.

Overview of QSFP-DD

QSFP-DD is an advanced evolution of the QSFP form factor, designed to double lane density from 4 to 8 high-speed electrical lanes, supporting aggregate data rates of 400G and beyond using PAM4 signaling at 50G per lane . It maintains backward mechanical compatibility with QSFP28 and QSFP56 cages, enabling seamless upgrades without increasing port space or power consumption . The standard is maintained by the QSFP-DD Multi-Source Agreement (MSA) and is widely adopted in carrier-grade, cloud-scale, and AI-driven networks .

Key Features for Carrier-Grade Routers

• High Bandwidth Density: Supports 400G Ethernet and breakout options to 4x100G or 8x50G, enabling flexible deployment in core, edge, and aggregation layers .
• Interoperability: Certified modules are tested on platforms from Cisco, Arista, Juniper, and Dell, ensuring reliable performance in multi-vendor environments .
• Electrical and Optical Standards: Compliant with IEEE 802.3bs, 400GAUI-8, CEI-56G-VSR-PAM4, and 400GBASE-SR4/FR4/DR4 standards .
• Hot-Pluggable Design: Allows easy replacement or upgrades without network downtime .
• Extended Reach Options: Modules support multimode fiber (up to 100m over OM4) and single-mode fiber (up to 2km with FR4 modules), suitable for both data center and carrier networks .

Examples of Carrier-Grade QSFP-DD Modules

• Cisco QDD-400G-VR4 and QDD-400G-SR8-S: Provide 400G connectivity with MPO-12 or MPO-16 APC connectors, supporting breakout to 4x100G or 8x50G links .
• Cisco DP04QSDD-HE0: A 400G-ZR+ DCO C-Band transceiver optimized for long-haul carrier networks, offering high transmission power and reliability for large-scale deployments .
• FS QDD-SR8-400G and QDD-FR4-400G: Certified for multiple vendor platforms, supporting 70–100m over OM3/OM4 MMF and 2km over SMF, respectively, with full compliance to IEEE 802.3bs and 400GAUI-8 standards .

Integration with Carrier-Grade Routers

Carrier-grade routers like the Nokia 7750 SR-s leverage QSFP-DD modules to achieve high-speed, scalable, and energy-efficient IP routing. The 7750 SR-s supports 400G and 800G QSFP-DD optics, enabling modular adapters for future-proof deployments, while maintaining robust security, automation, and deterministic performance . QSFP-DD modules allow these routers to handle edge, core, peering, and data center gateway applications with predictable performance under all operating conditions .

Benefits for Service Providers

• Scalability: High-density ports allow service providers to scale bandwidth without increasing rack space.
• Flexibility: Breakout options enable mixed-speed deployments (100G, 200G, 400G, 800G).
• Reliability: Certified modules ensure consistent performance across multi-vendor networks.
• Future-Proofing: Supports next-generation Ethernet standards and high-speed optical interconnects. QSFP-DD modules are therefore a critical component for carrier-grade routers, providing the high-speed, high-density, and interoperable connectivity required for modern IP networks, data centers, and service provider infrastructures .