IBM 8265 Nways ATM Switch, User Manual, Page: 120 / 192

Budgeting Power
Before install a new 8265 module in the switch, you should establish that there is sufficient power
available for it to operate. The SHOW POWER BUDGET command displays current switch power
conditions that help you decide if there is sufficient power available to power up and operate the new
module.
When the controller module powers up an 8265 module, the controller module adjusts the available power
budget to reflect the power consumption of the newly powered-up module. The controller module then
powers up remaining modules (by power class and slot location) to the limit of the unallocated power
budget.
By maintaining an accurate power budget, the controller module can determine:
Ÿ
Which installed modules to power up
Ÿ Which installed modules (if any) to power down to bring module power consumption under budget
Ÿ Which installed modules to place in power pending state due to a lack of sufficient unallocated power
budget to power them up.
This section describes:
Ÿ Determining the Power Budget
Ÿ
Increasing the Unallocated Power Budget.
Determining Switch Power Budget
To ensure optimal power fault-tolerance, determine the current power budget for the switch as follows:
1. Enter the SHOW POWER BUDGET command at the terminal prompt. The SHOW POWER BUDGET
command shows the amount of power currently available for modules:
Ÿ Total power installed
Ÿ
Amount of power consumed
Ÿ Amount of power available.
Compare this information with the power requirements for each module installed.
Refer to the Planning and Site Preparation Guide to determine your module power requirements. Take
into account any modules you plan to install, as well as those already installed.
Note: Power supply output values displayed by the SHOW POWER BUDGET command have been
rounded down. Therefore, these values may not precisely match those provided in the
documentation shipped with each module.
2. Examine the output of the SHOW POWER BUDGET command. If necessary, add another power
supply to your switch.
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IBM 8265: User's Guide