Definitions
This section defines common Power® Management terms:
- Active power state
- A computer is in the Active power state when a user is working on the computer and is using one of the input devices (specifically the mouse or keyboard). The computer is considered to be using full power in this state.
- CO2 Emissions
- Carbon dioxide (CO2) is one of the primary greenhouse gases and power generation is one of the largest sources of carbon dioxide emissions. The amount of carbon dioxide emitted per kWh generated varies significantly based on how the electricity is generated. For example, hydroelectric and nuclear power plants do not emit carbon dioxide, but coal-fired power plants emit significant carbon dioxide.
- Idle power state
- This state is considered to be using full power but the user is not actively interacting with the system. In many cases, the idle power state is considered to be wasted electricity because the computer is not using low power modes, but is not being used.
- Power off state
- The computer is off.
- Power States
- System Power States define the overall power consumption of a system. IBM® Endpoint Manager Power Management tracks four main power states Active, Idle, Standby or Hibernation, and Power Off. See the definition entries for Active, Idle, Standby, and Power-off.
- Price per kWh
- This is the amount you pay for electricity. One kWh is equal to 1,000 watts used for one hour. As a reference point, a standard desktop and monitor runs for approximately six hours on one kWh of electricity. A typical cost for a kWh is $0.10 in many regions of North America. However, electricity costs vary significantly depending on region and power provider, and different computer models have different power usage.
- Standby power state
- Also known as "Sleep" or "Hibernation". This state is the low power mode where the user's working session is saved in the memory or to the disk.
- Wake-on-LAN
- Wake-on-LAN (WoL) is a standard mechanism for waking computers by sending them a specific network packet which is known as the magic packet. Wake-on-LAN is difficult in many network environments because of network restrictions regarding broadcasts from other subnets. IBM Endpoint Manager Power Management handles these complexities by sending WoL packets from nearby agents in the same subnet.
- Wake-from-Standby
- Windows™ and other operating systems allow applications to wake a computer from standby at predefined times. Using Wake-from-Standby, a computer wakes itself without the need for Wake-on-LAN.