This read-only Integer32, measured in dBm, reports the minimum Receive Signal Level the Link interface has seen during the previous rolling 24-hour interval. Because a falling minimum RSL over that window signals fading or a developing alignment or weather problem on the microwave link, an admin watches this value to catch link-margin erosion before it causes outages. For example, if wvlinkTotalMinimumRSL drops from -45 dBm to -62 dBm between two polls, that dip flags a brief deep fade, such as heavy rain or antenna misalignment, that occurred sometime in the last 24 hours even though the link is currently receiving fine.