This read-write integer sets the Peak Cell Rate for a PXM-managed connection, with the note that if left unset on an MGX shelf, the value is instead derived automatically from the connection's end-point parameters. Admins can explicitly configure this to override the automatically derived rate when a specific peak rate is required rather than relying on the end-point-derived default. For example, an admin needing a connection to have a specific guaranteed peak rate different from what the end-point parameters would imply would explicitly set ausmConnPCR rather than leaving it to be derived.