Сколько пар нужно для PoE

IEEE 802.3af defines PoE as a technology that allows the transmission of electrical power and data over the existing Ethernet infrastructure. The main advantage of PoE is that it eliminates the need for an additional power source or outlet, allowing for a much simpler and more cost-effective deployment of network devices.

1. Количество проводов
2. Количество жил
3. Какую витую пару использовать для PoE
4. Подробные советы
5. Заключение

Количество проводов

PoE requires a minimum of two pairs of wires for the transmission of power and data, with the standard IEEE Alternative A specifying that only pairs 1-2 and 3-6 should be used. This means that for 10BASE-T or 100BASE-TX, which require only two pairs of wires, the unused wires, such as 4-5 and 7-8, can be used for power transmission.

Количество жил

One way to transmit power using PoE is to use the unused wires within a twisted pair cable. For example, in Fast Ethernet networks, only 4 wires (or two pairs) are used for data transmission, leaving the other 4 wires unused.

Какую витую пару использовать для PoE

It is important to use the right type of cable for PoE. Ethernet cables that belong to category 5e or higher, and are made of copper rather than aluminum, are typically required to transmit power through PoE.

Подробные советы

When setting up a PoE network, there are several important factors to consider:

• Make sure the network switches and other hardware devices support PoE.
• Choose the right type of Ethernet cable that supports PoE and monitor the cable length to ensure that there is no voltage drop.
• Install surge protectors to prevent potential electrical damage to the connected devices.
• Use a PoE injector or PoE switch to provide power for non-PoE devices.
• Always follow the manufacturer's instructions for setting up and configuring PoE devices.

Заключение

PoE has revolutionized the way that network devices are powered and deployed, making it possible to eliminate the need for bulky power adapters and simplify network installations. However, it is important to use the right type of cable and hardware, and take the necessary precautions to ensure that PoE is implemented safely and effectively.