TelebyteSPE Model 4950 10BASE-T1L Cable Emulator with Integrated SCCP Protocol Analyzer for Single Pair Ethernet (SPE) Testing.

Model 4950
10BASE-T1L Cable Emulator with
Integrated SCCP Protocol Analyzer

Single Pair Ethernet (SPE) Testing Solution


Telebyte’s Model 4950 offers the world’s first standard-based cable emulator designed for testing Single Pair Ethernet (SPE) as defined in IEEE 802.3cg for the 10BASE-T1L PHY.

This full duplex link will support power and communications over the same data line connected to devices at the edge of the “smart factory” network. The cost-effective technology provides data and analytics for industrial automation including control systems and cloud applications for remote operation as well as monitoring and management of the entire “intelligent building.” Elevators, HVAC, power, security access, wireless access points, sensors, industrial controls, cameras, robotics, railway and transportation as well as lighting may all be integrated on the enterprise network.

Suitable for Compliance, Safety, and Interoperability Testing.

See this product being used in Telebyte’s Network Topology Diagram

Features Include
Simulation of Single Balanced Pair of Conductors as defined in section 146.7.1 of IEEE 802.3cg-2019
o Attenuation supports two PHY operational modes (1.0 or 2.4Vpp)
o Differential Return Loss
o Link Delay
o DC Resistance
Cable Lengths:
o 1.0Vpp mode cable model: 100m, 200m, 400m, 500m, 750m, 1km, 1.1km, 1.4km, 1.7km
o 2.4Vpp mode cable model: 50m, 150m, 250m, 350m, 400m, 500m, 600m, 750m, 850m, 1km, 1.1km,1.4km*, 1.7km*,2.0km*
Low Noise Floor of < -165 dBm/Hz
Bandwidth DC to 20 MHz
Integrated Current Monitor, 0 to +/-2.5A
Integrated Voltage Monitor at each end of the link, 0 to +/-60 VDC
Data logging of current and voltage with timestamps every 500ms or 1s
Serial Communication Classification Protocol (SCCP) Analyzer to view register data and logic analyzer view of pulses with timing
Fault Tolerance and Safety Testing with Short Circuits on the differential pair or on signal wires to the Shield (Ground) from 5ms to 100ms in 1ms steps (Short Current to not exceed ~3.5A)
Integrated Differential Mode Noise Injection at each end of the cable emulator
Wide Dynamic Range of Noise output when integrating with Telebyte’s Universal Noise Generator: -70dBm/Hz to -155dBm/Hz
Micro-Interrupts from 5ms to 500ms in 1ms increments to simulate intermittent connections at wire joints (terminal box). Tests Power Over Data Line stability and Signal integrity path with reflections.
Compliance Testing for Timers to test Maintain Full Voltage Signature for PoDL stability
Supports Type E Power Class Devices w/ 60V DC, 2A, 90Watts
1 to 80.5 Ohm variable Cable DC resistance emulation in 0.5 ohm increments
Symmetric and Bi-directional emulation
Ideal for Testing Power Over Data Lines (PoDL), Type E Classes 10 to 15
Integrated electronic circuit breaker and ground fault current condition (GFI)
Repeatable, configurable, realistic
Remote Control via telnet or SSH with a command line interface (CLI)
Linux SBC with built-in web server for browser user interface
Made in the USA

Current/Voltage Monitor The Model 4950 includes an integrated current and voltage monitor at the PSE and PD. In addition, the user may enable data logging to monitor current and voltage over the link for long term thermal or stability testing of Power over Data Line. For safety, the unit will open the cable emulator in the event of over-current error conditions (electronic circuit breaker or ground fault current conditions [GFI]).

Protocol Analyzer
This innovative product includes a Protocol Analyzer for the Serial Communication Classification Protocol (SCCP) to monitor or troubleshoot the half-duplex bi-directional serial data bus for communication between the Master PSE and Slave PD devices. The initialization sequence of reset, presence, write, and read pulses are presented with time stamped information in a tabular or graphical view similar to a logic analyzer. This information is available to the user via a web interface and/or remote commands. The CRC pass/fail criteria, Volt Info, Power Info, Power Assign and Class Type Info register values may be checked as well.  

Cable Faults
The Model 4950 is able to verify fault tolerance performance with short circuits on the Single Pair Ethernet link from 5ms to 80ms in 1ms increments to determine when the PSE will shut down the output power should a short circuit be detected between the differential pair or a signal wire to ground. The short condition can be placed at the PSE or PD end of the link with normal operation expected after the short circuit is removed.

Ten inline cable connections are allowed in the standard. To emulate faulty connections, this product will support mechanical faults called Micro-Interrupts. These may be inserted from 1ms to 500ms onto the twisted pair link to open a single wire or both wires to emulate a bad wire joint.

If these cable faults are subject to vibration from heavy equipment or HVAC, they may experience impedance discontinuities which affects the signal path with reflections and also the DC power to the Powered Device which may cause the link to drop or underperform.

Noise Testing
It is vital to test link performance in noisy conditions such as those found in factory environments with harsh EMC radiated noise. The Model 4950 features integrated differential mode noise injection at each end of the cable emulator and is designed to be used with Telebyte’s 4975 SPE Noise Generator and Analyzer (see separate datasheet) to inject a mixture of noise in the frequency and/or time domain on the data line. This reduces the signal-to-noise margin and validates the data rate and stability of the DUT in the presence of noise.

Telebyte’s Model 4975 also supports the signal capture of real-world noise environments on the twisted pair including impulse noise, RFI, inductive noise, and background noise floor. The captured noise can be recorded and played back on the Telebyte noise generator to replicate different noise environments during lab testing.

Cable Emulation
The 4950 simulates variable insertion loss, DC resistance, impedance and delay. All 10BASE-T1L PHYs must support the insertion loss specified for 1.0Vpp transmit/receive amplitude in the standard, but the specification also has an option for the 2.4Vpp transmit/receive amplitude.

Telebyte’s repeatable test solution provides a variety of cable lengths for both the 1.0Vpp and 2.4Vpp transmit amplitude PHY operational modes, each with the applicable low and high insertion loss (attenuation) curves. The 1.0Vpp (low voltage) is optimal for intrinsically safe applications or relatively low noise environments or during energy efficient operation. For more severe noise environments with older and longer twisted pair cables (with high attenuation), a higher transmit level using 2.4Vpp is beneficial. Testing both transmit amplitude conditions ensures devices are interoperable in multiple cable plant and EMC environments.

1.0Vpp Operational Mode Cable Model.

1.0Vpp Operational Mode Cable Model
For PHYs in the 1.0Vpp operation mode, the insertion loss of each 10BASE-T1L link segment shall meet the values determined using equation B.

2.4Vpp Operational Mode Cable Model

2.4Vpp Operational Mode Cable Model
For PHYs in the 2.4Vpp operation mode, the insertion loss or attenuation of each 10BASE-T1L link segment shall meet the values determined using this equation: