System maintenance should never interrupt the RTN as our three-tier redundancy allows us to route all connections to any of the three RTNs while we do updates on the others. Updates are also done after hours and typically on weekends (e.g., monthly security patches). For whatever reason that one of our RTN servers might be down (individual server uptime is over 98%) it is extremely unlikely that all three RTNs would be down at the same time. Make sure your crews use the DNS C4Gnet.XYZ instead of an IP address to contact our NTRIP casters so that they can automatically be routed to the best quality of RTN service using our three-tier RTN redundancy architecture.