A method for signal degradation alarm detection in a digital microwave system, includes the steps of: summing code violation values from cells of a given buffer except for one of the cells currently indicated in the given buffer to calculate a code violation sum value of a corresponding provision, and setting a code violation limit value to a previously defined value; comparing the code violation sum value with the code violation limit value; setting a signal degradation alarm flag to detect an alarm when the code violation sum value is greater than or equal to the code violation limit value; adding the code violation sum value to a next code violation sum value of a lower buffer to obtain a new code violation sum value when the code violation sum value is less than the code violation limit value; setting the signal degradation alarm flag to detect the alarm when the new code violation sum value is greater than or equal to the code violation limit value; and ending performance of the method without setting the signal degradation alarm flag when a final code violation sum value corresponding to a lowermost buffer is less than the code violation limit value.
CROSS REFERENCE TO RELATED APPLICATIONS
This application makes reference to, incorporates the same herein, and claims all benefits accruing under 35 U.S.C. .sctn.119 from an application for Method For Signal Degradation Alarm Detection And Cancellation In Synchronous Digital Microwave System earlier filed in the Korean Industrial Property Office on 20 Oct. 1995 and there duly assigned Ser. No. 36342/1995.
The excessive bit error rate detection algorithm operates in two modes: BURST mode and non-BURST mode. In non-BURST mode, an alarm state is entered if an error count exceeds a threshold within a set number of frames and exits the alarm state when the error count stays below a threshold for a set number of frames. In the BURST mode, the alarm state is not entered unless the error count exceeds the threshold two consecutive times and does not exit the alarm state unless the error rate remains below a threshold for two consecutive frame counts.
