This read-only octet string holds a rolling per-second history of RSSI values for the last 60 seconds, with each octet representing one second's signal strength in -dBm. An admin uses this short-term history to spot brief signal dropouts or fast-fading events on the cellular link that a single instantaneous RSSI reading would miss. For example, if users report intermittent, short-lived connectivity glitches, the admin can pull this 60-second RSSI history to see whether the signal dipped sharply for a few seconds right around the time of the reported issue.