3Com 9000 manual Power Class

34CHAPTER 3: MANAGING DEVICES

The following events occur during an overheat condition:

1The Master EME character display shows the word TEMP

2If an SNMP agent is present in the chassis, power management informs the SNMP agent of the overheat condition.

3A 1-minute delay is provided, during which the Master EME and external management entities are notified of the overheat condition.

4Approximately 1 minute later, the EME initiates a power-off strategy to all CoreBuilder 9000 modules installed in the overheat management areas where the overheat condition was detected.

5The overheat indication TEMP stops when the chassis internal operating temperature falls below the temperature threshold and stays there for 15 minutes.

The EME does not power off modules that occupy slots outside of affected overheat management areas. This overheat power-off strategy is based on the power class setting and slot location of each installed switch fabric module and interface module.

The two overheat auto-power-down modes are:

■Enable — Causes slots to power off automatically when the chassis overheats.

■Disable — (the default) Causes the EME to send notification to network management applications, but the chassis keeps operating.

Power Class

A power class setting is a value in the range of 1 through 10 that is assigned to each module. The highest setting is 10. The EME uses the power class settings to manage power among the modules in the chassis, and to determine the order in which it powers on and powers off installed modules.

Each CoreBuilder 9000 Switch module is shipped with a default power class setting:

Module	Default Power Class Setting
EME	10
EMC	10
Interface Module	3
Switch Fabric Module	9