Chassis and Power Supplies
Monitoring Chassis Power
OmniSwitch 7700/7800 Hardware Users Guide
April 2005
page 2-21
Checking Chassis Power Before Shutting Off or Removing
a Power Supply
When shutting off or removing a power supply, it is important to remember that you are reducing the
amount of watts available for NI and CMM modules. In other words, disabling a power supply signifi-
cantly affects the switch’s overall power budget.
Before shutting off or removing a power supply, note that an AC power supply provides approximately
480 usable watts
. Therefore, when removing a power supply, you must first verify that enough watts will
be maintained by the remaining power supplies to support the number of modules installed.
Example 1: Adequate Power to Remove a Power Supply
1
Enter the
show chassis
command. A screen similar to the following displays:
-> show chassis
Model Name: OS7700,
Description: OS7700,
Part Number: 901748-ÿÿÿ
Hardware Revision: 202,
Serial Number: 1467014A,
Manufacture Date: NOV 16 2001,
Admin Status: POWER ON,
Operational Status: UP,
Free Slots: 9,
Power Left: 535,
Number Of Resets: 2
In this example, the “Power Left” field displays 535 unused watts. If one power supply is removed, the
switch will have 55 unused watts (535 – 480 = 55). This is adequate power to support the current modules
installed; one power supply can be safely removed.
2
After the modules have been installed, re-enter the
show chassis
command to confirm the results:
-> show chassis
Model Name: OS7700,
Description: OS7700,
Part Number: 901748-ÿÿÿ
Hardware Revision: 202,
Serial Number: 1467014A,
Manufacture Date: NOV 16 2001,
Admin Status: POWER ON,
Operational Status: UP,
Free Slots: 9,
Power Left: 55,
Number Of Resets: 2
Important Power Supply Redundancy Recommendation.
It is strongly recommended that the switch
maintains power supply redundancy whenever possible. Refer to
