Unlike compact SDRs, full IPMI sensors usually report a value that a sensor is able to measure and a unit of measurement. To help identify fails and warnings each full sensor is also programmed with a set of limits that define normal and abnormal operational ranges; or to be more precise, upper and lower limits for non-critical, critical and non-recoverable sensor reads. It is worth mentioning that the values are intended for informational purposes only. They are not used to identify problems directly. Instead, IPMI-over-LAN protocol defines a bit-mask with six dedicated values for each abnormal event: LNR for Lower non-recoverable, LCR for Lower critical, UNC for Upper non-critical and so on.