A Power-over-Ethernet (PoE) communication system dynamically provides power and data communications over a communications link. In a computing environment made up of one or more personal computing devices (PCD) and/or one or more powered devices (PD), power source equipment (PSE) determines an allocated amount of power to be supplied to each device. The personal computing devices include a unified LAN-On-Motherboard (LOM) that combines the functionality of a powered device (PD) controller of a conventional PD and a LOM of a conventional personal computing device into a single unified subsystem. This allows the personal computing devices to use the existing hardware architecture and software architecture, such as software drivers and Access Protocol Interfaces (API), with few modifications to implement PoE. Further, the personal computing devices provide the power source equipment with access to some of the operational parameters, such as the voltage and the current of the personal computing device, using a communication via the data link layer, also referred to as layer two in the Open System Interconnection (OSI) networking model. Additionally, the power source equipment may dynamically manage the power requirements for the personal computing devices using the data link layer.