9C300-1 Environmental Module Operation
System Humidity
The 9C300-1 Environmental Module monitors the non-condensing humidity level of the MMAC-Plus. The results of the monitoring are available to the network manager via LCD, as well as local and remote management. The humidity levels are displayed as shown in Table 3-2.
Table 3-2. System Humidity
Humidity | LCD Display |
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0–45% | STATIC RISK |
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46–94% | NORM (normal) |
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95% and above | MOIST |
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System Voltages
The 9C300-1 Environmental Module monitors specific system power parameters to ensure that they are within acceptable limits. The power parameters monitored from the backplane are the 48 volt DC System Power Bus and the INB Termination Power Bus. The power parameter monitored within the Environmental Module is the 12 volt internal line. The results of the monitoring are available to the network manager via LCD, as well as local and remote management. Voltages above or below the acceptable voltage limits cause an alarm to be sent to the network manager. Table 3-3summarizes these acceptable voltage limits.
Table 3-3. Acceptable Voltage Limits
Description | Acceptable Voltage Limits |
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48 volt DC System Power Bus | From 40 volts to 59 volts |
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INB Termination Power Bus | From 3.1 volts to 5 volts |
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12 volt internal line | From 11 volts to 13 volts |
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Internal Operating Temperature
The 9C300-1 Environmental Module monitors its own internal operating temperature by comparing its current temperature to the ambient temperature and programmed rise temperatures to determine current temperature status. If the temperature of the Environmental Module exceeds normal operating limits, an alarm is sent to the network manager. In addition, if the ambient temperature sensor fails, pre-established temperature ranges have been programmed to ensure proper internal temperature monitoring.
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