How do I deploy PoE? Remember the following 5 tips

PoE power supply refers to the transmission of power while transmitting data to network equipment without changing the original network architecture. The carrier is a network cable. If PoE is correctly deployed, it is very safe and reliable, and it can also save costs. This is a relatively new network technology. If you can keep the following 5 tips in mind, you can help PoE successfully deploy.

Provide sufficient power to the powered device

This one sounds very easy, but in practice, it is not so simple. The IEEE802.3af standard defines a five-level power supply standard that can provide a maximum of 12.95W power to the powered device. The power loss caused by the cable length must also be considered. Therefore, the power supply device must provide at least 15.4W at each port. power. For a 24-port PoE switch, it is necessary to provide more than 370W of power. In addition, the switch needs to consider the power required by the data exchange itself.

Therefore, pay close attention to the power of the power supply equipment: the PoE power supply module used in the intermediate access method (also taking 24 ports as an example) must be not less than 370W, and the output power of the 24-port PoE switch must be greater than 370W. As for how much, it depends on the power consumed by the switch for data exchange. Generally speaking, a non-PoE switch can be used to measure the power consumed by the switch itself, plus the power of 15.4W per port, to obtain the minimum output power required by a PoE switch.

Use uninterruptible power supply equipment like UPS

Some powered devices that use PoE power are often mission-critical devices, such as Internet phones. Once the power is turned off, the voice is completely cut off and it is impossible to talk. Whether it is a traditional program-controlled exchange phone or an IP phone, it is very important to keep it open. Therefore, when designing the network, it is necessary to distinguish such key equipment that cannot stop power supply and data transmission, and use uninterruptible power supply equipment such as UPS for backup power supply to keep power and data always flowing.

Adopt PoE-compliant switches

When deploying PoE, be sure to ensure that the power-supplying end and the power-receiving end are compatible with each other. Of course, if both the power supply device and the power receiving device comply with the PoE standard, you have nothing to worry about. Once one end of the device does not claim to be PoE compliant, you need to exercise caution.

It is recommended that you read the manual and its technical parameters carefully before using the device. It is not possible. You must contact the technical support of the manufacturer to ensure that the power supply equipment and power receiving equipment you use are compatible with each other. If you ignore this, you are likely to pay both time and money.

Don't ignore cable performance

What kind of cable are you using? Maybe Cat5, or 5e, or even 6. The higher the level of the cable, the smaller the power loss and the better the performance. There are bad manufacturers will charge the next time, so you need to carefully read the technical parameters provided by the manufacturer, whether it really meets the performance of 5e or 6. If the budget is adequate, try to use a higher-grade cable.

It is also important to remember that only four nodes can be allowed between a switch or hub and a network card. If the intermediate access method is adopted and the PoE power supply module is used for power supply, then the module itself must be counted as a node. Many people often ask: What is the longest cable distance when using PoE power supply? The correct answer is 100 meters from the switch / hub to the network card, rather than 100 meters from the PoE power supply module to the powered device. The length is not power, but data transmission.

Adopt a more cost-effective PoE deployment method

As mentioned earlier, there are two methods of PoE deployment, one is the end access method and the other is the intermediate access method. The end access method usually uses a PoE switch as the power supply device. This method is recommended for new networks because the topology is simple and the connections are not prone to errors. Anyway, if you want to buy a new switch, you can spend more money and buy a PoE switch, which is very easy.

If you have recently purchased or upgraded a switch, you are now deploying PoE equipment and find that the switch you just purchased is not PoE. Is it a bit frustrating-you have to re-spend money to buy a new switch that meets the standards. Do n’t worry, a huge benefit of PoE is that this technology does not need to uproot the original network and overturn it. It can also use this technology without changing the existing network structure and facilities. convenient.

In this case, it is recommended to use the intermediate access method. Between the original switch and the powered device, a PoE power supply module is connected. This is also 802.3af compatible, and the problem can be solved with only a slight increase in cost.