This part of IEC 62481 specifies guidelines for low-power mode management. Power saving is modular within a physical device. In the context of DLNA networked devices@ each physical network interface can have various power modes@ some of which can allow Layer 2 or Layer 3 connectivity to still be present@ even when many of the other components of the device are powered down. Other physical components@ such as screens@ hard drives@ and similar resources@ can also support different power modes.