3Com 4007, Руководство по внедрению, Страница: 118 / 684

118 C
HAPTER
5: M
ANAGING THE
C
HASSIS
P
OWER AND
T
EMPERATURE
Power Class 10 Warnings
The EME cannot automatically power off a module that is assigned a
power class setting of 10.
For example, if a power supply failure causes a power deficit (or if a
chassis overheat condition develops), a module that is assigned a power
class setting of 10 continues to run until you order it to power off. Under
some conditions (such as an extended overheat condition), chassis or
module hardware damage may result.
CAUTION: To ensure that the EME can make all power management
decisions automatically, do not assign a power class setting of 10 to any
switch fabric module or interface module unless it is absolutely necessary.
Budgeting Power
This section describes:
■
Allocating Power for Installed Modules
■
Increasing the Unallocated Power Budget
■
Determining Chassis Power Budget
■
Power Supply Output in Non-Fault-Tolerant Mode
■
Power Supply Output in Fault-Tolerant Mode
Allocating Power for
Installed Modules
Before you install a new module in the chassis, use the
show power
budget
command to confirm that there is sufficient power for installed
modules. The
show power budget
command displays current chassis
power conditions that help you decide if there is sufficient power
available to power on and operate the new module.
Table 27 shows selected EME power management commands and their
functions.
Table 27 Selected EME Power Management Commands
Command Name Displays
show power budget
Power budget information on a per-voltage basis.
Displays actual voltages measured on the backplane.
show power slot
<slot #>
or
<all>
Power class, power state, and power status for the
module in a specified slot, or in all slots.