E5071C ENA Option TNR Enhanced Time Domain Analysis – Product Fact Sheet

Automotive Ethernet PHY layer analysis and debug

To meet the demand for higher security in automobiles, a faster and more reliable in-vehicle network is required to improve vehicle control. In addition, simultaneous streaming of high quality video and sound, and the digitization of camera systems have increased network traffic for vehicle information systems. Automotive Ethernet, which can cover both control and information systems, is gaining attention. Investigation into the automotive Ethernet specification is based on the IEEE802.3 100BASE Ethernet standard. ENA Option TDR provides a solution for 100BASE physical layer evaluation (cable measurement, return loss measurement).

Cable evaluation

Traditionally, a TDR oscilloscope was used for time domain measurements and a vector network analyzer for frequency domain measurements. With ENA Option TDR, both the time and frequency domains can be analyzed with a single instrument. The U7237A (Ethernet test fixture) is used to connect to the device under test. For more accurate measurements, calibration is possible with the calibration kit (RJ-45 type Open, Short, Load standards). By recalling the necessary state file, you can easily setup, measure, and perform limit testing for pass/fail judgment.

Hot TDR (Return Loss) evaluation

Impedance is a parameter indicating the ratio of the amount of reflected voltage to the incident voltage and is an important parameter for system evaluation. For poorly impedance matched systems, transmission waveform quality is deteriorated due to multiple reflections. Hot TDR is the impedance measurement of active devices under actual operating conditions. Typically, the impedance is significantly different between the OFF state and operating state (Hot TDR). By evaluation Hot TDR, complex design issues can be solved more efficiently.