This counter reports the total number of times Layer 1 has detected a Loss of Signal on this line, including both qualified and unqualified, i.e. brief, sub-integration-period, occurrences. Because it captures every detected LOS event rather than only the sustained ones counted by lsLayer1LOS, an admin can compare the two counters to gauge how much line instability is transient noise versus genuine outages. A line where lsLayer1LOSAll is much higher than lsLayer1LOS suggests frequent brief signal dropouts that never last long enough to qualify as a full alarm, hinting at marginal but not fully failed cabling.