This read-only Integer32 reports the mean signal strength, in dBmV, sampled for this specific ComPort during the current 15-minute period, per the description. It gives the admin a live per-subscriber signal-level reading, distinguishing one customer's transmit power from the port-wide noise readings. For example, an admin compares hcxStatsCurrMinMeanSignal across several ComPorts on the same port to spot one subscriber transmitting unusually low or high relative to the others.