QSFP-40/100-SRBD=, Cisco QSFP Transceiver, 100G/40G SR-BiDi, LC, 100m OM4 MMF

The Cisco QSFP-40/100-SRBD is a high-performance dual-rate optical transceiver module designed to support both 40G and 100G Ethernet transmission. It utilizes advanced SR-BiDi (Short Range Bi-Directional) technology and operates over multimode fiber (MMF) with LC duplex connectors, enabling simplified cabling and cost-effective network upgrades.

This module is widely deployed in modern data centers and enterprise networks where infrastructure reuse is essential. It allows seamless migration from 40G to 100G without requiring changes to existing fiber cabling, making it a highly efficient and scalable solution for network expansion.

By using dual-wavelength transmission technology (typically 850nm and 900nm), the QSFP-40/100-SRBD supports high-speed data transfer up to 100 meters over OM4 MMF, ensuring reliable short-reach connectivity in high-density environments.

Figure 1 shows the front panel of QSFP-40/100G-SRBD=.

• Dual-rate support: 40GBASE-SR-BiDi and 100GBASE-SR-BiDi
• LC duplex interface (no MPO/MTP required)
• Up to 100m transmission distance over OM4 MMF
• Supports OM3 and OM4 multimode fiber
• Low power consumption for energy-efficient operation
• Hot-pluggable QSFP form factor
• Enables seamless 40G to 100G migration
• Ideal for data center short-reach interconnects

The QSFP-40/100-SRBD uses SR-BiDi optical technology, which enables bidirectional data transmission over only two strands of multimode fiber, instead of the traditional 8-fiber MPO architecture.

Each fiber carries data in both directions using different wavelengths, significantly reducing fiber usage while maintaining high-speed performance.

This architecture provides several advantages:

• Reduces fiber cabling complexity
• Lowers installation and infrastructure cost
• Enables reuse of existing fiber networks
• Simplifies data center cable management

• Data center interconnect (DCI)
• Enterprise core and aggregation networks
• Cloud computing infrastructure
• High-performance computing (HPC) clusters
• Cisco switch interconnection (Nexus / Catalyst platforms)

The Cisco QSFP-40/100-SRBD module is compatible with multiple Cisco networking platforms. However, compatibility may vary depending on software version and hardware model. Always verify support before deployment.

Conclusion:
QSFP-40/100-SRBD is ideal for environments requiring low-cost 100G upgrades without replacing existing fiber infrastructure, while SR4 is better suited for greenfield deployments.

It is used for high-speed data transmission in data centers, supporting both 40G and 100G Ethernet over multimode fiber.

No. This module uses LC duplex connectors, eliminating the need for MPO/MTP cabling systems.

• Up to 70 meters on OM3 MMF
• Up to 100 meters on OM4 MMF

Yes, it is designed for Cisco platforms such as Nexus and Catalyst series, depending on software and hardware compatibility.

It reduces fiber usage by enabling bidirectional communication over two fibers, simplifying cabling and reducing infrastructure cost.

Yes, it is a dual-rate module that supports both 40G and 100G operation modes.

It supports OM3 and OM4 multimode fiber with LC duplex connectors.

• Future-proof dual-rate design
• Cost-effective upgrade from 40G to 100G
• Simplified LC-based cabling architecture
• Reduced infrastructure and deployment cost
• Ideal for modern data center evolution