September 2025
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Dependent Interface” or “Port Interface” (MDI/PI). The integration of power
Single-Pair Ethernet and Power-Over-Data Lines... For a more in-depth
supply alongside data transmis- sion requires a robust, classifica- tion-based power supply protocol to ensure compatibility between power sourcing equipment (PSE) and powered devices (PD). The protocol is defined in IEEE 802.3cg (SPoE, 2019). The electrical requirements
for SPoE are defined in the fol- lowing IEEE standards:
l IEEE 802.3cg (10BASE-T1): Bandwidth 0.1 to 20 MHz, range up to 1,000m.
l IEEE 802.3bw (100BASE-T1): Bandwidth 0.3 to 66 MHz, range up to 40m.
l IEEE 802.3bp, (1000BASE- T1): Bandwidth 1 to 600 MHz, range up to 40m.
The cables used for SPoE
differ from the standard cables used for Ethernet. SPoE requires cables that are defined in IEC 61156, i.e. “multicore and bal- anced pair/quad cables for digital communication.” Standard CAT 6 or CAT 7 cables, even if they are shielded, are not suitable. SPoE can be integrated into
a mixed system with common industrial Ethernet protocols such as Ethernet/IP, Profinet and EtherCAT and can provide a simultaneous power supply for end devices. Figure 2 shows a typical setup.
SPoE Hardware Topology The hardware topology of
the SPoE reference design RD041 consists of two boards, the PSE circuit and the PD cir- cuit. The interfaces with primary transient protection, common
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mode chokes, transformers and secondary transient protection to the PHY are the same for the PSE and the PD. Power and data are coupled together at the interface via a power cou- pling network. The SPE transmission
path operates at a data rate of 10 Mb/s with an ampli- tude of approx. 2.5 VPP, the operating voltage on the two-wire line is 20 to 24 VDC. The PSE and PD implementation are de - scribed in detail in the paper
of the reference design RD041.
look, see Würth’s white paper “Design of a Single Pair Ethernet System with Power Over Data Lines (SPoE).
Contact: Würth
Figure 2: Mixed system with industrial Ethernet.
Elektronik eiSos GmbH & Co. KG, Clarita-Bernhard- Strasse 9, 81249 Munich, Germany % +49-892-4293-6407 E-mail:
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CONNECTING THE FUTURE OF SOLDERING CONNECT SMART
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