https://www.redhat.com/en/topics/cloud-computing/what-is-a-hyperscaler
Out-of-band (OOB) management is a method of remotely controlling and managing devices and infrastructure using a separate management plane from the production network. This allows administrators to access and manage devices even if the primary network is down or compromised. OOB management is often used for tasks like provisioning, monitoring, troubleshooting, and remediation, especially during network disruptions
https://www.perle.com/supportfiles/out-of-band-management.shtml