I'm not an expert on this, but my understanding is that General Relativity is already taken into account for by the master time source. I'm not one of the ops

I'm not an expert on this, but my understanding is that General Relativity is already taken into account for by the master time source. I'm not one of the ops guys, but as explained to me, each of our NJ & NY datacenters, our PTP masters are synced to the DC master which is synced to GPS. We also have processes that monitor if the SIP feed drifts from our time.