The system fan assembly provides cooling air for the internal chassis components. The fans exhaust warm air from one end and draw in cool air at the other end. Figure 1-3 shows the direction of airflow through the Catalyst 2948G switch. Figure 1-4 shows the direction of airflow through the Catalyst 2980G switch. If an individual fan fails, the other fans continue to run.
Sensors monitor the internal air temperatures.
If the air temperature exceeds a tolerable threshold, the environmental monitor displays warning messages. The Catalyst 2948G switch has a 120W AC internal power supply. The Catalyst 2980G switch has a 175W AC internal power supply. The Catalyst 2980G-A has a 156W AC internal power supply. To order an RPS, consult the Cisco Product Catalog .