Continuing our exciting discussion on 800G optical transceiver, let’s dive into the essential transmission standards: 2VR4, VR8, 2SR4, SR8, 2DR4, DR8, 2FR4, and 2LR4. These standards can often be a source of confusion when selecting the right module for your specific needs. But don’t worry! By the end of this guide, we’ll clarify each standard and provide a practical purchasing guide to simplify your decision-making process.

800G Optical Transceivers’ Transmission Standards

800GBASE-2VR4

The 2xVR4 module is a versatile 800G solution that supports dual 400G modes, allowing it to split into two independent 400G links. This flexibility enhances compatibility with existing networks, making it a smart choice for many applications.

• Transmission Distance: Up to 50 meters using OM4 multimode fiber.
• Transmission Mode: Multimode Fiber.
• Wavelength: Operates at 850nm.
• Interface Type: Utilizes MPO-12 connectors.
• Technology: This module features two independent sets of four optical channels (totaling 8 channels), each capable of 100Gbps, achieving a total rate of 800Gbps. It employs VCSEL technology for high performance and low power consumption, utilizing PAM4 modulation for enhanced transmission efficiency.
• Application Scenarios: Perfect for interconnecting servers and switches within data centers, especially for server to ToR (Top-of-Rack) switch connections. It’s also an excellent transitional solution when upgrading from 400G to 800G.

800GBASE-VR8

The VR8 module is designed for very short-distance interconnections, making it ideal for high-density environments.

• Transmission Distance: Up to 50 meters using OM4 multimode fiber.
• Transmission Mode: Multimode Fiber.
• Wavelength: Operates at 850nm.
• Interface Type: Utilizes MPO-16 connectors.
• Technology: This module employs 8 channels (4 transmit + 4 receive), each at 100Gbps, totaling 800Gbps. With its low power consumption, it’s perfect for short-distance applications, utilizing PAM4 for improved efficiency over traditional NRZ.
• Application Scenarios: Ideal for interconnections between servers and switches within data centers, particularly in high-density setups.

800GBASE-2SR4

The 2xSR4 module architecture supports a total transmission rate of 800Gbps and can be split into two independent 400Gbps links, tailored for short-distance interconnects.

• Transmission Distance: Up to 100 meters using OM4 multimode fiber; 30 meters with OM3.
• Transmission Mode: Multimode Fiber.
• Wavelength: Operates at 850nm.
• Interface Type: Utilizes MPO-12 connectors.
• Technology: This module features two sets of 4 channels (totaling 8 channels), each at 100Gbps. It’s designed for flexibility, supporting existing 400G infrastructure while using VCSEL technology for low power consumption and PAM4 for efficient transmission.
• Application Scenarios: Perfect for short-distance interconnects within data centers, such as server to ToR switches, and serves as a transition solution from 400G to 800G.

800GBASE-SR8

The SR8 module simplifies wiring and enhances deployment efficiency with its single 800G link design.

• Transmission Distance: Up to 100 meters using OM4 multimode fiber.
• Transmission Mode: Multimode Fiber.
• Wavelength: Operates at 850nm.
• Interface Type: Utilizes MPO-16 connectors.
• Technology: This module employs 8 channels (4 transmit + 4 receive), each at 100Gbps, achieving a total rate of 800Gbps. It’s optimized for short-distance multimode fiber interconnects, utilizing PAM4 for better bandwidth utilization.
• Application Scenarios: Ideal for high-density connections within data centers, such as ToR to core switches, and for high-performance networking in hyperscale data centers.

800GBASE-2DR4

The 2DR4 module is engineered for long-distance transmission, featuring two independent 400G links over single-mode fiber.

• Transmission Distance: Up to 500 meters using OS2 SMF cable.
• Transmission Mode: Single-Mode Fiber.
• Wavelength: Operates at 1310nm.
• Interface Type: Utilizes Dual MPO-12 connectors.
• Technology: This module supporting 8×106.25Gbps (totaling 850Gbps) data rates with PAM4 technology, enabling seamless transmission of massive data volumes over long distances.
• Application Scenarios: Ideal for long-distance transmission in data centers and metropolitan area networks (MAN), supporting high-bandwidth, low-latency demands.

800GBASE-DR8

The DR8 module is designed for efficient long-distance transmission, supporting high-density data transfer.

• Transmission Distance: Up to 500 meters.
• Transmission Mode: Single-Mode Fiber (SMF).
• Wavelength: Operates at 1310nm.
• Interface Type: Utilizes MPO/MTP-16 connectors.
• Technology: This module employs 8×106.25Gbps (53.125GBd PAM4) electrical and optical connections.
• Application Scenarios: Perfect for long-distance data center interconnects and efficient transmission in metropolitan area networks (MAN).

800GBASE-2FR4

The 2FR4 module is tailored for long-distance single-mode fiber transmission.

• Transmission Distance: Up to 2 km.
• Transmission Mode: Single-Mode Fiber (SMF).
• Wavelength: Operates at 1310nm.
• Interface Type: Utilizes Dual Duplex LC connectors.
• Technology: This module employs 8×106.25Gbps (53.125GBd PAM4) for both electrical and optical interfaces.
• Application Scenarios: Ideal for long-distance data center interconnects and high-bandwidth applications in metropolitan area networks (MAN).

800GBASE-2LR4

The 2LR4 module is designed for extensive long-distance transmission, making it perfect for high-capacity networks.

• Transmission Distance: Up to 10 km.
• Transmission Mode: Single-Mode Fiber (SMF).
• Wavelength: Operates at 1310nm.
• Interface Type: Utilizes Dual Duplex LC connectors.
• Technology: This module employs 8×106.25Gbps (53.125GBd PAM4) for both electrical and optical interfaces.
• Application Scenarios: Ideal for inter-data center connectivity, especially in hyperscale and cloud data centers, as well as for inter-city optical fiber transmission.

How to Choose the Right 800G Module For your Network?

1. Short-Distance (≤50 meters)

• Recommended Modules: 2VR4 or VR8
• When to Choose:
  • Ideal for rack-to-rack or short-distance interconnects within data centers.
  • 2VR4 is perfect for two separate 400G links, while VR8 offers a single 800G link for higher-density needs.
• Use Cases:
  • Connecting servers to Top-of-Rack (ToR) switches.
  • High-density short-distance interconnects where 50 meters is sufficient.

2. Medium-Distance (≤100 meters)

• Recommended Modules: 2SR4 or SR8
• When to Choose:
  • Best for medium-distance links within the same data center (up to 100 meters).
  • 2SR4 provides dual 400G links for flexibility, while SR8 offers a single 800G link.
• Use Cases:
  • Interconnections between switches and core switches.
  • Links in high-density environments like large data centers.

3. Long-Distance (≤500 meters)

• Recommended Modules: 2DR4 or DR8
• When to Choose:
  • Suitable for long-distance connections within data centers or upgrading from 400G to 800G.
  • 2DR4 offers dual 400G links, while DR8 is a higher-density single 800G link.
• Use Cases:
  • Longer-distance interconnects between data center pods, core-to-core switches, or across campuses.

4. Very Long-Distance (1-10 kilometers)

• Recommended Modules: 2FR4 or 2LR4
• When to Choose:
  • Perfect for cross-campus or inter-data center connections (1–2 km for 2FR4 or up to 10 km for 2LR4).
  • 2FR4 is designed for medium-range, while 2LR4 is for long-range fiber communications, such as in metro area networks.
• Use Cases:
  • Campus-to-campus or inter-city data center links.
  • Long-distance connections over single-mode fiber (SMF) for high-bandwidth applications like cloud data center interconnects.

Key Considerations for Selection

1. Distance: The most crucial factor is the transmission distance between equipment. Choose based on the maximum required distance.
2. Bandwidth Density: For higher-density connections (e.g., between core switches), opt for modules with more lanes (like SR8 or DR8).
3. Future Proofing: If you plan to gradually upgrade from 400G to 800G, consider modules with dual 400G links (like 2VR4, 2SR4, or 2DR4).
4. Fiber Type: Ensure you select modules compatible with the appropriate fiber type (single-mode fiber, SMF) based on your infrastructure.

Conclusion

• For short-distance, low-latency connections, go with 2VR4 or VR8.
• For medium to long-distance within a data center, 2SR4, SR8, 2DR4, or DR8 would be more suitable.
• For long-range campus or inter-data center connections, 2FR4 or 2LR4 will provide the necessary reach.

With this guide, you’re now equipped to make informed decisions about your 800G optical module needs!

FAQs About 800G OSFP and QSFP-DD Modules

Q1: Can an OSFP interface module be plugged into a QSFP-DD interface?

A1: Unfortunately, no! The OSFP and QSFP-DD modules are designed with different physical sizes and connection methods, which means they are not compatible with each other. Think of it like trying to fit a square peg into a round hole—it’s just not going to work!

Q2: Can an OSFP at one end of an 800G link interoperate with a QSFP-DD at the other end?

A2: Yes, they can! While OSFP and QSFP-DD refer to different physical form factors, they can interoperate as long as the Ethernet media type is the same. This means you can mix and match these modules in your network setup, giving you flexibility in your design!

Q3: Does Asterfusion sell the corresponding 800G/51.2T switch? Can I learn more about it?

A3: Absolutely! Asterfusion offers a cutting-edge 800G switch, specifically our self-developed 800G/51.2T switch, which is powered by our enterprise version of SONiC NOS—AsterNOS. This switch is engineered to meet the demanding requirements of various applications, including AI, machine learning, data centers, high-performance computing (HPC), and distributed storage. Curious to learn more? Check out Asterfusion’s product page for all the details! 64 x 800G Switch Ultra Ethernet, 51.2Tbps, Marvell Teralynx 10, For AI/ML/Cloud Data Center/HPC

Join the Conversation!

Have more questions about 800G Module OSFP, QSFP-DD, or Asterfusion’s products? Let’s discuss! Share your thoughts or inquiries in the comments below. Your insights could spark a great conversation.