Single-Pair Ethernet (SPE) Standard Circuit Design Reference

VOOHU Electronics has launched a single-pair Ethernet (SPE) solution based on the JLSEMI JL31X1.
This solution is used for single-pair twisted-pair communication, supporting RMII 100Mbps/GMII 1Gbps data rates and conforming to IEEE 802.3. This design implements the digital backend for sensors and actuators. For communication with the layers above, the design utilizes a 10BASE-T1L SPE, allowing for cable lengths up to 1km and a data throughput of 10Mbps.

JL31X1 Wiring Topology Diagram

The front end uses MII/GMII/RGMII to link the MAC layer, and the back end uses MDI communication to access 100/1000BASE-T1 communication;
The front end uses SGMII to link the MAC layer, and the back end uses MDI communication to access 100/1000BASE-T1 communication;
The front end uses RGMII to link the MAC layer, and the back end uses SGMII for direct interaction between the MAC and PHY.





Electrical Port Hardware Design
The following are the electronic components connected between the JL31X1 and the SPE connector:
Common mode choke;
Common mode termination (including R1, R2, R3, and C3);
DC blocking capacitors (including C1 and C2);
ESD protection (ESD/TVS)




ETH_T1 PHY Peripheral Design Reference:
The JL3111 is a high-performance 1000BASE-T1 and 100BASE-T1 Ethernet physical layer (PHY) transceiver series, manufactured on advanced process nodes based on JLSemi's mixed-signal and DSP technologies. This product series is designed for single-pair twisted copper cabling, supporting data transmission rates of 1 Gbps and 100 Mbps. The transceivers are fully compliant with IEEE 802.3bw and IEEE 802.3bp standards.
The JL3111 is AEC-Q100 automotive-grade certified and supports an extended temperature range of -40°C to 105°C.
The JL3111 achieves excellent electromagnetic compatibility (EMC) performance and low power consumption, making it suitable for a variety of automotive and industrial applications requiring reduced weight and lower network cabling costs.



This design is suitable for the automotive and compact intelligent industrial applications, featuring excellent EMI/EMC and ESD performance, meeting the interference immunity and low power consumption requirements of both automotive and industrial control fields. It offers significant advantages such as reduced thread costs, lightweight circuit design, high communication efficiency, and stable communication quality, and has been widely applied in automotive domain controllers, vehicle networking, vehicle testing equipment, industrial automation systems, robotic arms, and other devices.



Note: The above solutions are standard designs for reference only. The final circuit design will be based on on-site requirements. Contact us for free in-depth support.
           Tel: 400-1048-018; E-mail: wohu@wohu-tek.com;

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