This parameter defines the value to be sent as a signal after alarm detection: 'Space' = both A and B signaling bits are forced to '0' during out-of-service periods. 'Mark' = both A and B signaling bits are forced to '1' during out-of-service periods. 'spaceMark' = A and B bits are forced to '0' for 2.5 seconds; then they are switched to '1' until out-of-service condition disappears. 'markSpace' = A and B bits are forced to '1' for 2.5 seconds; then they are switched to '0' until out-of-service condition disappears. - '0'= 0 for T1, 1 for E1, or user defined value for Space - '1'= 1 for T1, 0 for E1, or user defined value for Mark.