This string is the human-readable description accompanying the remote invocation error code recorded for this internal backplane link's workflow. It matters on the internal Ethernet link that carries a blade's traffic from the chassis I/O Module up to a Fabric Interconnect over the backplane because it is often the only plain-English explanation of why an automated discovery or configuration step failed remotely. An fsmRmtInvErrDescr mentioning a timeout on this backplane link points an admin toward a connectivity or responsiveness problem on the IOM rather than a configuration mistake.