It is bit mask giving the set of current active failure on the downstream line. The value is retrieved from BCM6519. A failure is declared when the corresponding defect is active for more than 2.5 (+ or - 0.5) sec. A failure is cleared when the corresponding defect is off for at least 10.5 (+ or - 0.5) sec. The bit index and corresponding failures are: Bit[1]: Set when unavailable time is counted Bit[2]: Set when the modem is not in the RUNNING_SHOWTIME state Bit[6]: Loss of ATM cell or PTM packet delineation, bearer B0 Bit[7]: Loss of ATM cell or PTM packet delineation, bearer B1 Bit[12]: Loss of signal Bit[13]: Loss of frame Bit[14]: No ATM cell or PTM packet delineation, bearer B0 Bit[15]: No ATM cell or PTM packet delineation, bearer B1 Bit[18]: Loss of power Bit[24]: CONFIG_ERROR Bit[25]: HIGH_BIT_RATE Bit[26]: COMM_PROBLEM Bit[27]: NO_PEER_DETECTED Bit[28]: Set when the loss of margin failure is set (when the SNR margin drops below the the minimum SNR margin for more than 20 consective seconds). Bit[29]: Set when the line leaves Showtime because the L3 state is requested by the CO or CPE.