IEEE 802.3af-Compliant Single-Port Power-Sourcing-Equipment Application
The IEEE 802.3af standard, also known as Power over Ethernet (PoE), specifies the mechanisms by which electrical power is transmitted alongside data over standard Ethernet cabling. This standard allows for the delivery of power to devices such as IP cameras, VoIP phones, and wireless access points without the need for additional power supplies or outlets.
In a typical PoE system, two main components are involved: the power-sourcing equipment (PSE) and the powered device (PD). The PSE is responsible for supplying power, while the PD receives and utilizes that power. The standard outlines specific voltage levels, typically 44 to 57 volts DC, and a maximum power output of 15.4 watts per port for compliant devices.
The IEEE 802.3af standard employs a detection mechanism to ensure compatibility between the PSE and PD. When a PD is connected to a PSE, the PSE sends a low voltage signal to detect the presence of a compatible device. If a valid PD is detected, the PSE initiates power delivery. This detection process is crucial to prevent damage to non-PoE devices.
Furthermore, the standard includes specifications for power classification, allowing PSEs to identify the power requirements of connected devices. This classification enables dynamic power management, ensuring that the total power supplied does not exceed the capacity of the PSE.
Overall, the IEEE 802.3af standard plays a vital role in simplifying network infrastructure by enabling the integration of power and data transmission, enhancing the versatility and efficiency of network deployments.The IEEE 802.3af standard governs how the power-sourcing-equipment and power device interact with each other in a power-over-ethernet system.. 🔗 External reference
Related Circuits
Envision a master controller device that manages other devices within a household without the need for additional wiring to facilitate data transmission. The concept of a master controller device serves as a central hub in a smart home ecosystem, enabling...
To create a telephone ring monitor, it is sufficient to connect a resistor in series with a bulb and plug it into a main outlet. The resistance value of this resistor may vary depending on the type of bulb...
A typical representative of dynamic noise reduction developed by the United States National Semiconductor is the LM1894. Its principle is illustrated in Figure 1-1070, where the left and right input signals are processed through a main signal path. The...
This application note provides insight into how to synchronize multiple high-speed DACs in transmitter applications. This document outlines the techniques and methodologies for synchronizing multiple high-speed Digital-to-Analog Converters (DACs) in various transmitter applications. Synchronization is crucial in systems where multiple...
The A1602A is a 40-pin dual in-line package that functions as a playback preamplifier. It utilizes linear low-noise amplifiers with a voltage gain of 26.4 dB. Each channel has a separate discharge sound preamplifier, selected by an electronic switch...
Enhancements include an analog front end, pin-to-pin compatibility for existing designs, an analog stabilized comparator, and simplified external circuit design. There is improved time and temperature measurement with reduced current consumption. The TDC-GP21 is ideally suited for designing compact...