This variable indicates the Status of the interface. It contains failure state information. The variable is a bit map represented as a sum, therefore, it can represent multiple failures simultaneously. The sonetSectionLineNoDefect must be set if and only if no other flag is set. The various bit positions are: 1 sonetSectionLineNoDefect 2 sonetSectionLOS Loss Of Signal 4 sonetSectionLOF Loss Of Frame 8 sonetSectionLOC Loss Of Clock 16 sonetLineAIS Alarm Indication Signal 32 sonetLineRDI Remote Defect Indication 64 sonetLineRFI Remote Failure Indication (RDI lasts for 2.5 (+-0.5) seconds) 128 sonetLineEBER Excessive Bit Error Rate 256 sonetLineSD Signal Degradation 512 sonetOOF Out Of Frame.