Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Active State Power Management or ASPM is a power management protocol used to manage PCI Express-based serial link devices as links become less active over time. It is normally used on laptops and other mobile Internet devices to extend battery life.As serial-based PCIe bus devices, such as IEEE1394 (FireWire), become less active, it is possible for the computer's power management system to take the opportunity to reduce overall power consumption by placing the link PHY into a low-power mode and instructing other devices on the link to follow suit. This is usually managed by the operating system's power management software or through the BIOS, thus different settings can be configured for laptop battery mode versus running from the battery charger.

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