The 400GBASE-FR4 (400 Gigabit Ethernet Four-Wavelength Short-Range) transceivers are designed for high-speed data transmission in data center and networking environments. Here are the key features and specifications of 400GBASE-FR4 transceivers:

1. Data Rate:

• 400 Gbps: 400GBASE-FR4 transceivers support a data rate of 400 gigabits per second.

2. Wavelengths:

• Four Wavelengths: The "FR4" designation indicates that the transceiver uses four different wavelengths for communication.

3. Fiber Type:

• Single-Mode Fiber (SMF): 400GBASE-FR4 transceivers typically operate over single-mode fiber, which is designed for longer-distance transmissions.

4. Distance:

• Reach: The transceivers are designed for short-range applications, typically reaching distances of up to 2 kilometers.

5. Modulation:

• PAM4 Modulation: 400GBASE-FR4 transceivers often use PAM4 (Pulse Amplitude Modulation with 4 levels) modulation to achieve the higher data rate. PAM4 is a modulation scheme that encodes multiple bits in each symbol.

6. Form Factor:

• QSFP-DD (Quad Small Form-Factor Pluggable Double Density): 400GBASE-FR4 transceivers commonly use the QSFP-DD form factor, which is an extension of the QSFP form factor designed to support higher data rates.

7. Connector:

• MPO/MTP Connector: The transceivers typically use MPO/MTP connectors, which are multi-fiber connectors commonly used in high-speed optical communication.

8. FEC (Forward Error Correction):

• FEC Support: Forward Error Correction is often incorporated in 400GBASE-FR4 transceivers to enhance the reliability of data transmission by detecting and correcting errors.

9. Operating Temperature:

• Standard Operating Temperature Range: The transceivers are designed to operate within a specific temperature range to ensure optimal performance.

10. Compliance and Standards:

• IEEE Standards: 400GBASE-FR4 transceivers adhere to the relevant IEEE (Institute of Electrical and Electronics Engineers) standards for 400 GbE.

11. Hot-Pluggable:

• Hot-Pluggable and Hot-Swappable: Like other transceivers, 400GBASE-FR4 transceivers are hot-pluggable and hot-swappable, allowing for easy installation and replacement without disrupting the entire network.

12. Application:

• Data Center and High-Speed Networking: 400GBASE-FR4 transceivers are suitable for high-speed data center applications and other networking scenarios where 400 Gbps connectivity is required.

These specifications highlight the key characteristics of 400GBASE-FR4 transceivers, making them a valuable component in high-performance networking environments that demand ultra-fast data rates and short-range connectivity.

Additional Learning Hub Resources  

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