This read-write integer (1..10) sets the number of UNI/NNI events monitored for the N392 error-threshold check, which per its description must always be configured greater than n392, noting signalling parameters do not apply to frame forwarding ports. An administrator sets N393 to define the sliding window of recent polling events against which the N392 error count is evaluated. For example, with n392ErrorThreshold set to 3, n393MonitoredEventCount must be set to something greater, such as 5, so the error check evaluates 3 errors within a window of 5 monitored events rather than an invalid equal or smaller window.