This reports the normalized total received optical power at the OTS level for this line, expressed as a plain Integer32 relative value rather than an absolute dBm reading. Because this reading sits in a Stats-table row that resets only when explicitly cleared rather than on the fixed bin schedule, the normalization lets this line's aggregate power be compared against its own expected power budget regardless of how many wavelengths are currently provisioned on it. For example, a value near 0 means the whole fiber's combined power sits at its expected budget; a large negative reading here despite normal individual OCh values suggests a channel-count mismatch or a tap/splitter loss on this line, since this row's last manual clear.