What bandwidth of the oscilloscope is adequate for testing a 1000BaseT signal?
A. Most of the energy of the Test Mode signals for 1000BaseT lies in the range of 1MHz to 100MHz. An oscilloscope with bandwidth of 1GHz or more is recommended as it would result in less errors in measurement and hence in more reliable testing. For 1000BaseT, it is highly recommended to use an oscilloscope with bandwidth > 1GHz as lower bandwidths can result in reduced margins.