Specifications

52 ExtremeWare XOS 11.0 Concepts Guide
Managing the Switch
The BlackDiamond 10808 switch includes two power supply controllers that collect data from the
installed power supplies and report the results to the MSM modules. When the BlackDiamond 10808
switch is first powered on, the power supply controllers enable the power supplies by providing 48V
power. As part of the power management function, the power controller disables the PSU if an unsafe
condition arises. For more information about the power supply controller, see the Extreme Networks
BlackDiamond 10K-Series Switch Installation Guide.
Initial System Boot-Up
When ExtremeWare XOS boots up, it reads and analyzes the installed I/O modules from left to right,
beginning with slot 1 through slot 8. If the system has enough power, the I/O modules are powered up,
from left to right. If the system does not have enough power, some I/O modules are not powered up.
For example, ExtremeWare XOS:
• Reviews the number of PSUs installed to determine how many are running and their respective
voltage
• Checks for PSU failures
• Calculates the number of I/O modules to power up based on the available power budget and the
power requirements of each I/O module
• Calculates the amount of power required to power up a second MSM if only one MSM is installed
The system also collects information about the installed PSUs including the:
• Type of PSU installed
• Status of the PSU
By reading the PSU information, ExtremeWare XOS determines the power status and the total amount
of power available to the system. The total power available determines how many and which types of
I/O modules can be enabled.
Removing a Power Supply
If you remove a PSU or it fails, the switch may not have enough power to keep all of the I/O modules
running. If there is not enough power, the switch powers down the I/O module in the highest
numbered slot, from right to left, and continues to power down I/O modules until the switch has
enough power to operate.
Installing or Replacing a Power Supply
If you install a new PSU or replace an existing one because there is insufficient power to keep the I/O
modules powered up, the powered down I/O modules are brought back online after the switch
calculates the amount of power required for all of the I/O modules.
If you disable a slot, the I/O module will always be powered down regardless of the number of PSUs
installed.
NOTE
You cannot mix and install different types of PSUs in one chassis.