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Model 4925
Reference Link Partner
Power Source (PSE) or
Power Load (PD) Emulator

Single Pair Ethernet (SPE) (10-BASE-T1L/SPoE/Ethernet-APL) Testing Solution for Testing PSE or PD Devices

Single Pair Ethernet (SPE) 10BASE-T1L and Single Pair Power over Ethernet (SPoE) are based on the IEEE 802.3-2022 and IEEE 802.3dd-2022 standards and offer game-changing advances for Operational Technology (OT) networks. These emerging technologies allow OT networks to deliver data and power up to 1km. SPoE provides 1.85W or a higher power of 79W, depending on the application, cable length, and device power demand. In addition, the 10BASE-T1L protocol provides a 10Mb/s full duplex data link.

The Telebyte 4925 Reference Link Partner Power Source (PSE) or Power Load (PD) Emulator is designed specifically for convenient, repeatable testing of Power Load (PD) or Power Source (PSE) devices. This specialized, multipurpose instrument is used with Telebyte’s Model 4950 Channel Emulator, probes, programmable power supply and load to provide engineers with a valuable debugging and compliance test tool in the development and verification of a PD or PSE device.

The Emulator can serve as a reference link partner for power and data conformance testing of the IEEE 802.3-2022 and IEEE 802.3dd-2022 standards. It is capable of simulating an Ethernet-APL Power Source (PSE) device or an Ethernet-APL Load (PD) device and supports the Ethernet-APL Data Test Specification Group 3 Transmit Packet Formation tests and Group 4 Receive Error Handling tests.

Model 4925 Back View


A Multipurpose Device
Reference Link partner in Telebyte’s Universal Test Setup for Conformance Testing

Power Class Validation
Perform four-corner, worst-case minimum and maximum voltage and current testing with power requirements per power class. Test the power stability of the link over varying link segment lengths, cable types, and DC Loop Resistance. Test with power faults such as shorts or impedance discontinuities on the in-line connections (using micro-interruptions on a single conductor) or a loss of signal on both conductors.

Serial Communication Classification Protocol (SCCP)
Serial Communication Classification Protocol (SCCP) is the bidirectional, single-wire serial communication protocol specified by the IEEE 802.3-2022 standard for negotiating power transfer requirements between the PSE and PD before the PSE applies power to the link.

The Telebyte 4925 supports SCCP for communicating with a PD or PSE device and is able to negotiate the six IEEE 802.3-2022 Type E power classes: 10, 11, 12, 13, 14, and 15. In addition, it can vary bit timing for SCCP typical / min / max cases and insert bit timing errors.

Data Validation
The IEEE 802.3-2022 10BASE-T1L standard enables 10Mb/s full-duplex communications on Operational Technology (OT) networks up to a distance of 1,000m over a single twisted pair cable.  10BASE-T1L core capability is a full duplex, dc balanced, point-to-point communication scheme with PAM 3 modulation at a 7.5 MBd symbol rate with 4B3T coding to enable long link segments.

Users may configure the instrument to support auto-negotiation, advertise and / or request as a master or slave in the 1.0Vpp or 2.4Vpp operating modes, as well as capture the link signals on an oscilloscope after the 10BASE-T1L links up.

The instrument may also be used for Transmit and Receive Packet Tests that stress the PHY / MAC Interface with preamble count, Start of Frame Delimiter (SFD), programmable transmit Inter-Packet Gap (IPG), and Assert TX_ER to monitor if DUT responds correctly with Receive Errors (RX_ER, RX_DV).

Convenient and easy-to-use software is available to control the Analog Devices ADIN1100 10BASE-T1L PHY.