Immunity measurement of common mode conducted noise for 1000BASE-T1 communication equipment

The authors measured the immunity of common mode conducted noise for 1000BASE-T1 communication equipment. The common mode conducted noise was injected by the coupling network. As a result, communication errors occurred at some frequencies related to the symbol rate of 1000BASE-T1 such as 187.5 MHz, 250 MHz, 375 MHz, 500 MHz, and 562.5 MHz. Also, the authors found that communication errors occurred only around 0.2 MHz of these frequencies. This suggests that the above results could occur in many 1000BASE-T1 communication systems.