This read-write threshold defines the modem temperature, in degrees Celsius, above which the c3gModemTemperOnsetNotif notification is sent, provided c3gModemTemperOnsetNotifEnabled is set to true. An admin sets this to get proactive alerts about modem overheating before it becomes a reliability or hardware-damage concern, and the value must be greater than or equal to the abate threshold to avoid oscillating alerts. For example, setting this to 70 degrees Celsius means the admin gets notified the moment an outdoor-cabinet modem's internal temperature crosses that line, prompting a check of ventilation.