- Catherine
John Doe
Answered on 7:51 am
The difference between 400G-BIDI, 400G-SRBD and 400G-SR4.2 is mainly in the naming convention and the form factor of the modules. They are all based on the same principle of using four pairs of multimode fibers, each carrying two wavelengths of 25G signals in both directions, for a total of 400G bandwidth. The term 400G-BIDI is a generic name for this technology, while 400G-SRBD and 400G-SR4.2 are specific names for the modules that implement it.
The 400G-SRBD module is based on the QSFP-DD form factor, which is a double-density version of the QSFP form factor. It has an MPO-12 connector that can be plugged into an existing QSFP port. The 400G-SRBD module can also be used for breakout applications, where it can be connected to four 100G-BIDI modules that use the QSFP28 form factor.
The 400G-SR4.2 module is based on the OSFP form factor, which is a new form factor designed for higher power and thermal performance. It has an MPO-16 connector that can support higher fiber counts and longer distances. The 400G-SR4.2 module can also be used for breakout applications, where it can be connected to four 100G-SR1.2 modules that use the SFP-DD form factor.
Both the 400G-SRBD and the 400G-SR4.2 modules are compliant with the IEEE 802.3bm protocol and the 400G BiDi MSA specification. They can support link lengths of up to 100m over OM4 multimode fiber.
People Also Ask
Detachable Fiber Connection Technology in CPO Systems
In the rapidly evolving world of high-speed data communication, Co-Packaged Optics (CPO) technology stands out as a game-changer. By integrating optical and electronic devices into a single package, CPO overcomes the bandwidth limitations of traditional electrical interconnects. At the heart of a successful CPO system lies a critical component that
NVIDIA Launches Spectrum-XGS Ethernet Technology: From Scale-Up/Out to Cross-Domain Scaling!
In the lead-up to the 2025 Hot Chips conference, NVIDIA officially unveiled the Spectrum-XGS Ethernet technology. This innovative solution, based on network optimization algorithms, introduces “scale-across” capabilities, breaking through the power and space physical limitations of single data centers. It connects multiple data centers distributed across different cities and countries
1.6 T Optical Module Production Line TX Parallel Testing: A Comprehensive Guide
In the fast-paced realm of high-speed optical communications, major optical module manufacturers are leveraging 4-channel optical sampling oscilloscopes to enhance TX testing efficiency for 400G, 800G, and 1.6 T modules. However, due to the architectural differences between 4-channel and single-channel TX testing, extra attention to details is essential. Otherwise, even after
Scale Out vs Scale Up: Insights into AI Network Architectures for 2028
As a leading specialist in optical-communication products and solutions, FiberMall is dedicated to providing cost-effective options for global data centers, cloud computing, enterprise networks, access networks, and wireless systems. With our expertise in AI-enabled communication networks, we’re the perfect partner for those seeking high-quality, value-driven optical-communication solutions. In this blog,
Understanding Optical Transceiver Modules: A Comprehensive Guide to Technical Parameters
In the world of fiber optic communications, optical transceiver modules play a pivotal role as interfaces that convert electrical signals to optical signals and vice versa. If you’re dealing with data centers, telecommunications, or AI networking, grasping the key parameters of an optical transceiver module is essential. This blog post dives deep
Spine-Leaf vs. Traditional Three-Tier Architecture: Comprehensive Comparison and Analysis
Introduction Evolution of Data Center Networking Over the past few decades, data center networking has undergone a massive transformation from simple local area networks to complex distributed systems. In the 1990s, data centers primarily relied on basic Layer 2 switching networks, where servers were interconnected via hubs or low-end switches.
Related Articles
800G SR8 and 400G SR4 Optical Transceiver Modules Compatibility and Interconnection Test Report
Version Change Log Writer V0 Sample Test Cassie Test Purpose Test Objects：800G OSFP SR8/400G OSFP SR4/400G Q112 SR4. By conducting corresponding tests, the test parameters meet the relevant industry standards, and the test modules can be normally used for Nvidia (Mellanox) MQM9790 switch, Nvidia (Mellanox) ConnectX-7 network card and Nvidia (Mellanox) BlueField-3, laying a foundation for
Detachable Fiber Connection Technology in CPO Systems
In the rapidly evolving world of high-speed data communication, Co-Packaged Optics (CPO) technology stands out as a game-changer. By integrating optical and electronic devices into a single package, CPO overcomes the bandwidth limitations of traditional electrical interconnects. At the heart of a successful CPO system lies a critical component that
NVIDIA Launches Spectrum-XGS Ethernet Technology: From Scale-Up/Out to Cross-Domain Scaling!
In the lead-up to the 2025 Hot Chips conference, NVIDIA officially unveiled the Spectrum-XGS Ethernet technology. This innovative solution, based on network optimization algorithms, introduces “scale-across” capabilities, breaking through the power and space physical limitations of single data centers. It connects multiple data centers distributed across different cities and countries
1.6 T Optical Module Production Line TX Parallel Testing: A Comprehensive Guide
In the fast-paced realm of high-speed optical communications, major optical module manufacturers are leveraging 4-channel optical sampling oscilloscopes to enhance TX testing efficiency for 400G, 800G, and 1.6 T modules. However, due to the architectural differences between 4-channel and single-channel TX testing, extra attention to details is essential. Otherwise, even after
Scale Out vs Scale Up: Insights into AI Network Architectures for 2028
As a leading specialist in optical-communication products and solutions, FiberMall is dedicated to providing cost-effective options for global data centers, cloud computing, enterprise networks, access networks, and wireless systems. With our expertise in AI-enabled communication networks, we’re the perfect partner for those seeking high-quality, value-driven optical-communication solutions. In this blog,
Understanding Optical Transceiver Modules: A Comprehensive Guide to Technical Parameters
In the world of fiber optic communications, optical transceiver modules play a pivotal role as interfaces that convert electrical signals to optical signals and vice versa. If you’re dealing with data centers, telecommunications, or AI networking, grasping the key parameters of an optical transceiver module is essential. This blog post dives deep
Spine-Leaf vs. Traditional Three-Tier Architecture: Comprehensive Comparison and Analysis
Introduction Evolution of Data Center Networking Over the past few decades, data center networking has undergone a massive transformation from simple local area networks to complex distributed systems. In the 1990s, data centers primarily relied on basic Layer 2 switching networks, where servers were interconnected via hubs or low-end switches.