Microsemi’s™ PD64004AH is a 4-port, mix-signal, high-voltage Power over Ethernet (PoE) Manager designed to support IEEE 802.3af-2003 as well as 802.3at-2009 PoE applications. PD64004AH is used in Ethernet switches (Endspans) and Midspans to allow next generation network managers to share Power and data over the same cable. With full digital control via a serial communication interface and a minimum of external components, the PD64004AH can be designed into multi-port and highly populated Ethernet switches. PD64004AH integrates power, analog and logic functions in a single 48-pin, QFN-PS package allowing compact designs.The PD64004AH detects IEEE 802.3af-2003 compliant Powered Devices (PDs) and 802.3at-2009 PDs which exceed IEEE802.3af power level, ensuring safe power feeding and disconnection of ports. The PD64004AH executes all real time functions as specified in the IEEE 802.3af-2003 standard and the IEEE802.3at-2009 including: detection, 1-event classification and port status monitoring as well as system level activities such as: power management, MIB support for system management. The PD64004AH is designed to detect and disable disconnected ports, using both DC and AC disconnection methods, as defined in IEEE 802.3af-2003 and IEEE802.3at-2009.