Cabletron Systems 9C300-1 User Manual

 

9C300-1 Environmental Module Operation

3-4

 

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. 

 

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 3-3 summarizes these acceptable 
voltage limits.

 

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.

Table 3-2. System Humidity

 

0–45%

STATIC RISK

46–94% NORM 

(normal)

95% and above

MOIST

Table 3-3. Acceptable Voltage Limits

 

48 volt DC System Power Bus

From 40 volts to 59 volts

INB Termination Power Bus

From 3.1 volts to 5 volts

12 volt internal line

From 11 volts to 13 volts