• For earthing wire, green-and-yellow insulation is required, and the cross-sectional area of the conductormust be more than 0.75 mm2 or 18 AWG.• If the heat sensor inside the Control Box detects abnormally high temperatures, power supply to the unitwill be forcefully stopped. In that case, turn off the Control Box using the power switch, then turn it onagain.• If the feature is enabled, an error log will indicate when abnormal fan operation is detected in the systemheat control. In that case, consult the system administrator to replace of the fan.• The operating conditions (e.g., CPU usage percentage, memory usage, and Storage Memory Cardproduct life) are monitored, and monitoring results will be notified by methods such as the error log, MIB,and system alarm. For details, consult your system administrator.NoticeFor All Telephone Equipment• Read and understand all instructions.For the Control Box• Keep the unit away from heating appliances and devices that generate electrical noise such asfluorescent lamps, motors and televisions. These noise sources can interfere with the performance ofthe unit.1.1 For Your Safety12 Installation Manual