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QSFP28 Optical Module 800G Specifications

Optical access and telecom site reference Published 03 Feb 2024

Use this reference to prepare product questions for CGWEB NETWORKS. Check interfaces, capacity, protection and installation requirements against the current product documentation.

QSFP28 modules are widely used for 100G Ethernet, but for 800G applications, QSFP-DD or OSFP modules are the standard, offering high-density, low-power 800G connectivity. OverviewQSFP28 is primarily designed for 100G Ethernet deployments, using NRZ modulation and supporting four 25G lanes. While QSFP28 itself does not natively support 800G, it is backward compatible with QSFP-DD ports, which are designed for 400G and 800G Ethernet.

QSFP-DD modules double the electrical lanes compared to QSFP28, enabling higher throughput within the same form factor, making them suitable for modern high-speed data center networks. Key Specifications for 800G QSFP-DD/OSFP ModulesData Rate: 800G Ethernet throughput, often implemented as 8x100G DR8 or 4x200G lanes using PAM4 modulation. Link Distance: DR8 modules: up to 500 meters over G.

652 single-mode fiber (SMF) with MPO-16 connectors. FR4 modules: up to 2 km over SMF with duplex LC or CS connectors, using four wavelengths (1271, 1291, 1311, 1331 nm),. Connector Types: MPO-16, MTP/MPO-12, duplex LC, or CS depending on module type and reach.

Standards Compliance: IEEE 802. 3ck, IEEE 802. 3cu, OSFP/QSFP-DD MSA, CMIS Rev 5.

0. Applications: Data centers, high-performance computing networks, enterprise core/distribution layers, cloud networks, and breakout configurations (e.g., 2x400G DR4 or 8x100G DR),. Monitoring: Digital Diagnostic Monitoring (DDM) for real-time operating parameters.

Thermal Considerations: QSFP-DD modules are preferred for standard data centers, while OSFP modules are used in high-power AI/ML clusters due to better thermal performance. Comparison with QSFP28FeatureQSFP28QSFP-DD / OSFP 800GMax Data Rate100G800GModulationNRZPAM4Lanes4x25G8x100G or 4x200GTypical Reach100m (MMF) / 10km (SMF)500m–2km (SMF)ConnectorMPO/MTP or LCMPO-16, MTP/MPO-12, LC, CSApplications100G Ethernet, legacy data centers800G Ethernet, high-density data centers, HPC, cloudPractical ConsiderationsQSFP28 modules are not directly used for 800G, but QSFP-DD ports maintain backward compatibility with QSFP28 optics, allowing gradual network upgrades.

For 800G deployments, selecting the right module depends on link distance, fiber type, and thermal constraints. Breakout options allow splitting 800G into multiple lower-speed links (e.g., 2x400G or 8x100G), providing flexibility in network design. In summary, while QSFP28 is a 100G standard, QSFP-DD and OSFP modules are the practical choice for 800G networks, offering high-density, PAM4-based connectivity with support for various link distances and breakout configurations, fully compliant with IEEE and MSA standards.

QSFP28 Optical Module 800G Specifications - CGWEB NETWORK INFRASTRUCTURE [PDF]

QSFP28 Optical Module 800G Specifications
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