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ComputingWhat is PoE switch explained

What is PoE switch explained

Nowadays, managed PoE switches are becoming more and more popular among network users. Many people are more likely to choose a managed switch with PoE functionality over an unmanaged switch. So why, is there any particular reason? So, here is about the PoE switch.

What are managed and unmanaged switches

You may know that a network switch can be divided into two types at the management level: a managed switch and an unmanaged switch. In fact, a managed switch is a switch that allows you to access one or more interfaces in order to configure or manage features such as STP, port speed, VLAN, etc. This can give you more control over your LAN traffic and offer additional features to manage that traffic.

An unmanaged switch is a device that is similar in functionality to a hub, i.e. it transmits data packets from one port to the others. But unlike a hub, a switch transmits data only directly to the recipient and not to all devices, because the switch has a MAC-address table, thanks to which the switch remembers which port a device is on.

One of the main advantages of a managed switch is the ability to partition the local network using VLANs. That is, in addition to filling the MAC table, the switch adds information about the belonging of the received frame to a certain network segment. Accordingly, at a minimum, you get rid of a lot of broadcast traffic, set the availability of devices to a particular subnet, and increase security.

What does PoE mean

PoE actually means “Power over Ethernet”. PoE switch is a network switch with the function of powering connected devices over twisted pairs, such as IP cameras, wireless access points, network hubs, and other devices to which it is undesirable or impossible to wire the power cable. The main advantage or feature of PoE is to deliver data and power simultaneously over a single Cat5e or Cat6 Ethernet cable. It eliminates the need for AC or DC power supplies. What’s more, remote installation costs less than fiber. PoE Switch can work with a variety of networking equipment, for example at the same time can be connected to the ports of PoE devices, and at the same time the usual network cards of computers or routers. The type of connected device is automatically detected and the power is supplied according to the type of device.

Why it is better to use a managed PoE switch

PoE isn’t recommended for sending network data over long distances or for extreme temperatures unless there is an industrial designation. It is often seen in a Gigabit Ethernet Switch, and it is mostly used with IP cameras, VoIP phones, and WAPs (wireless access points). Here are the reasons why you should use a managed PoE switch.

There are many fine-tuning options available on a managed switch. The devices are designed for complex tasks, building large branching systems that include different technical characteristics of the equipment. Modern PoE-switch is a full-fledged element of a complex security system.

What are the benefits of PoE switch

The technology has many advantages:

  • A POE can be helpful if the equipment is located in an unplugged, hard-to-reach location. A single cable through the port provides communication, power and control of the camera or other device.
  • The elimination of a separate power line from the system saves on the maintenance of all equipment.
  • Safety in use is due to the maximum PoE voltage of 57 volts. The employee maintaining the system will not need a permit to work with electricity.

You have also to be aware that the PoE switch must be designed to provide power to all connected equipment. The power connected at any one time must not exceed the maximum allowable power for the unit. Exceeding it will result in its damage.

The power that can be connected is specified in the technical specifications of the unit. For example, an 8-port PoE with 150 W of power can be taken away by 130 W of connected devices. With the 802.3 standards, you can connect 8 devices with 15.4 watts each. But with an 802.3 at the system, 30 W appliances can only be powered from 4 ports.

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