This read-write TruthValue enables or disables the Comm Break Test; True enables it, False disables it. An administrator uses this to control whether the comm-break liveness test, paced separately by parNetParmCbDelay, runs on this node, distinguishing it from the separate comm-fail test controlled by parOnOffCommFailTest. For example, disabling comm break testing during a known network disruption avoids that specific test generating false alarms distinct from the comm-fail alarms.