Line Remote Failure Indication. A SONET port status indicator that activates when an LRFI defect occurs and does not clear throughout the alarm integration period, which is typically 2.5 seconds. An LRFI defect occurs when bits 6, 7, and 8 of the K2 byte are 110 for three consecutive frames. This occurrence begins the alarm integration period. If this period elapses without the detection of three consecutive frames in which K2 bits 6, 7, and 8 show any pattern other than 110, the LRFI indicator activates. The LRFI indicator clears when an LAIS defect does not occur for a time interval equal to the alarm deactivation period (typically 10 seconds).