IDU status reported with this parameter. Bit1 is MSB. The bit is set when a fault occurs. The bit is cleared when the fault clears. bit 1 = Power status bit 2 = Cable open status bit 3 = Cable short status bit 4 = Modem Lock status bit 5 = Temperature status bit 6 = No signal from ODU (Phos only) bit 7 = loopback status bit 8 = External alarm 1 status bit 9 = External alarm 2 status bit 10 = External alarm 3 status bit 11 = External alarm 4 status bit 12 = External alarm 5 status bit 13 = External alarm 6 status bit 14 = External alarm 7 status bit 15 = External alarm 8 status bit 16 = Remote connectivity status. bit 17 = Inner communication status. bit 18 = Link ID mismatch status. bit 19 = Configuration mismatch status. bit 20 = Shelf Id mismatch status (Phos only). bit 21 = General HW failure. bit 22 = No power to MUX board. bit 23 = No power to MODEM board. bit 24 = IDC disk firmware cinfiguration mismatch. bit 25 = Modem configuration file. bit 26 = Wayside channel E1/T1 LOS bit 27 = loopback on Wayside channel