This read-write threshold, expressed in dBm, defines the RSSI level below which the c3gRssiOnsetNotif notification fires for a given radio service, provided that service's bit is enabled in c3gRssiOnsetNotifFlag. An admin sets this to define what "weak signal" means for their environment, balancing early warning of degrading cellular coverage against nuisance alerts from normal signal fluctuation, and must keep its absolute value greater than or equal to the abate threshold. For example, setting this to -100 dBm means the router will raise an onset alert as soon as RSSI drops below -100 dBm, warning the admin of a weakening connection before it fails outright.