8265 Module Power-Down Response
This section describes how Intelligent Power Management responds to power deficits caused by selected
abnormal operating conditions.
Correcting a Power Deficit
To correct a power deficit, the controller module must reduce the power consumption of all installed
modules. The controller module can only reduce power consumption by:
Disabling power fault-tolerant mode (if in effect) to make reserve power available to installed modules.
Selectively powering down media modules to return power to the budget.
If the controller module is unable to respond to a power deficit (for example, due to a power failure), the
switch resets. Under these conditions, powerup (recovery) occurs when the 8265 reboots.
For more information, refer to the section titled Power Supply Failure later in this chapter.
Powering Up With Insufficient Power:
If there is insufficient power to power up, the controller module will automatically place modules in power
pending state until there is enough power to enable them.
Power Supply Failure:
Intelligent Power Management response to a power supply failure is determined by the current power
mode:
If a power supply fails while the switch is running in power fault-tolerant mode:
– The controller module responds by disabling power fault-tolerant mode. If the power budget deficit
remains in effect after power fault-tolerant mode has been disabled, media modules selectively
power down based on power class settings and relative slot locations until the power budget
deficit is corrected.
– Once the power budget deficit is corrected and there is again enough power to re-establish power
fault-tolerant mode, power fault-tolerant mode is automatically re-enabled.
Note: When a power deficit occurs while the 8265 is running in power fault-tolerant mode, the
controller module does not shut down media modules to reduce the power budget.
If a power supply fails while the 8265 is running in power non-fault-tolerant mode (the default mode),
the controller module may selectively shut down media modules in an attempt to bring module power
consumption under budget.
The media module power-down sequence is as follows:
The modules power down, in order, from slot 17 to slot 1, starting with modules having the lowest
power class setting.
If two or more modules have the same power class, they power down from slot 17 to slot 1.
Modules continue to be powered down until total power consumption is at or below budget.
You can specify the order in which media modules power down when a power supply failure occurs by
changing the module power class settings (SET POWER SLOT {slot} command).
Chapter 9. Managing the Power Subsystem
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