It doesn't – you'd still theoretically see aliasing of frequencies above the Nyquist limit, but the 5 GSPS QSGMII signal is well below that. (Also, the probe i

It doesn't – you'd still theoretically see aliasing of frequencies above the Nyquist limit, but the 5 GSPS QSGMII signal is well below that. (Also, the probe itself has a max bandwidth of 10 GHz, so it will filter those frequencies before they're sampled by the oscilloscope)