Per its description, this counts the number of Remote Failure Indications the far-end terminal has sent back to this box over the course of the current day. A day with several RFIs but no sustained far-end UAS tells an admin the remote end is repeatedly flagging brief alarm conditions -- worth investigating even though none of them individually lasted long enough to register as an outage. A reading of 6 by evening would mean the remote terminal declared an alarm condition and reported it back six separate times that day.