different bandwidth. And because the bandwidth is different for these filters, the net res- ult of combining these filters look like a band-pass filter (see Chapter 5) with the following characteristics: A lower cut-off in a range of between 0.05 Hz to 0.1 Hz (from the time filter) An upper cut-off in the range of between 1 Hz to 10 Hz for T-BC/T-TSC Classes A and B, and range of 1 Hz to 3 Hz for Classes C and D (from the frequency filter) Figure 9-29 illustrates this band-pass filter for the case of the Classes A and B clocks. Note that the figure is for illustration purposes only and is not strictly to scale. Amplitude PTP to PTP Frequency to frequency low-pass filter low-pass filter 0.05 Hz 0.1 Hz 10 Hz Frequency Net Result: Band-pass filter for frequency to PTP path Figure 9-29 Band-Pass Filter for Frequency to PTP Path for T-BC/T-TSC Classes A and B In summary, for a noise transfer test the following applies: PTP to PTP (and 1PPS) path: The phase and time noise presented on the PTP input of a T- BC/T-TSC will be transferred to the PTP (and 1PPS) output after the clock has filtered the noise using a bandwidth between 0.05 Hz and 0.1 Hz. Physical layer frequency to PTP (and 1PPS) for Classes A and B clocks: The noise presen- ted on the physical frequency input will be transferred to the PTP (and 1PPS) output after the clock has filtered the noise through a band-pass filter. This filter has a frequency of between 0.05 Hz and 0.1 Hz at the lower corner and between 1 Hz and 10 Hz at the upper corner. Physical layer frequency to PTP (and 1PPS) for Classes C and D clocks: The noise presen- ted on the physical frequency input will be transferred to the PTP (and 1PPS) output after the clock has filtered the noise through a band-pass filter. This filter has a frequency of between 0.05 Hz and 0.1 Hz at the lower corner and between 1 Hz and 3 Hz at the upper corner. Transient Response The transient response measures the reaction of a clock to some reorganization in its input reference signals. For the case of a T-BC/T-T