3Com 4007, Implementation Manual, Page: 123 / 684

Overheat Conditions 123
Enabling and
Disabling Automatic
Module Power-off
To enable automatic module power-off in response to an overheat
condition, use the
set power overheat_auto_power_down
command as
follows:
set power overheat_auto_power_down mode enable
set power overheat_auto_power_down mode disable
The two overheat auto-power-down modes are:
■
Enable — Causes slots to power off automatically when the chassis
overheats.
■
Disable — (default) Causes the EME to send notification to network
management applications, but the chassis keeps operating.
CAUTION: If
set power overheat_auto_power_down mode disable
is
in effect when an overheat condition occurs, the chassis and all installed,
powered-on, modules continue to run. Under these circumstances, an
extended overheat condition may cause heat-related hardware damage.
3Com recommends that you run the chassis with
overheat_auto_power_down enable
in effect.
In the following example, overheat power-down mode is enabled:
CB9000> set power overheat_auto_power_down mode enable
overheat-power-down mode set to ENABLE
CB9000>
The Overheat Management Area
The overheat power-off process in a 7-slot chassis is based on one
temperature sensor that treats the module payload area of the chassis as
one overheat management area. Modules power off in this overheat
management area according to their power class settings.