Product Overview
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=.
Key Features
- 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
Quick Specifications
| Item |
Description |
| Product Name |
Cisco QSFP-40/100-SRBD |
| Form Factor |
QSFP / QSFP28 |
| Data Rate |
40Gbps / 100Gbps |
| Fiber Type |
Multimode Fiber (MMF) |
| Connector Type |
LC Duplex |
| Wavelength |
850nm / 900nm |
| Maximum Distance |
70m (OM3), 100m (OM4) |
| Power Consumption |
~3.5W |
| Digital Diagnostic Monitoring |
Supported |
| Application |
Data Center, Enterprise Networks |
Technical Specifications
| Parameter |
Specification |
| Transmission Technology |
SR-BiDi (Bidirectional over 2 fibers) |
| Optical Interface |
LC Duplex |
| Compliance |
IEEE 802.3bm, QSFP MSA |
| Operating Temperature |
10°C to 60°C |
| Storage Temperature |
-40°C to 85°C |
| Protocol Support |
Ethernet 40G / 100G |
| Fiber Compatibility |
OM3 / OM4 MMF |
How SR-BiDi Technology Works
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
Applications
- Data center interconnect (DCI)
- Enterprise core and aggregation networks
- Cloud computing infrastructure
- High-performance computing (HPC) clusters
- Cisco switch interconnection (Nexus / Catalyst platforms)
Compatibility Notes
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.
Comparison: QSFP-40/100-SRBD vs QSFP-100G-SR4
| Feature |
QSFP-40/100-SRBD |
QSFP-100G-SR4 |
| Connector Type |
LC Duplex |
MPO/MTP |
| Fiber Requirement |
2-fiber MMF |
8-fiber MMF |
| Upgrade Path |
40G → 100G |
100G only |
| Cabling Complexity |
Low |
Higher |
| Infrastructure Cost |
Lower |
Higher |
| Best Use Case |
Network migration |
New high-density 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.
FAQ
What is Cisco QSFP-40/100-SRBD used for?
It is used for high-speed data transmission in data centers, supporting both 40G and 100G Ethernet over multimode fiber.
Does QSFP-40/100-SRBD require MPO cables?
No. This module uses LC duplex connectors, eliminating the need for MPO/MTP cabling systems.
What is the maximum transmission distance?
- Up to 70 meters on OM3 MMF
- Up to 100 meters on OM4 MMF
Is this module compatible with Cisco switches?
Yes, it is designed for Cisco platforms such as Nexus and Catalyst series, depending on software and hardware compatibility.
What is the main advantage of SR-BiDi technology?
It reduces fiber usage by enabling bidirectional communication over two fibers, simplifying cabling and reducing infrastructure cost.
Can it support both 40G and 100G networks?
Yes, it is a dual-rate module that supports both 40G and 100G operation modes.
What type of fiber is required?
It supports OM3 and OM4 multimode fiber with LC duplex connectors.
Why Choose QSFP-40/100-SRBD?
- 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
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