This object is the administrative on/off switch for a broadcast channel: locked immediately disconnects every subscriber watching it and blocks new join requests, while shuttingDown lets existing viewers finish but refuses new joins until it drains to locked. An operator uses this to pull a channel (for maintenance or a licensing change) without rebooting the whole OLT/ONU, and shuttingDown specifically gives a graceful way to retire a channel without abruptly cutting off people mid-stream. Setting channelAdminStatus to shuttingDown(3) on a channel being discontinued lets the last viewers keep watching until they change channels, after which the object automatically settles to locked(1).