Things to Know About Power Over Ethernet Switch

Nowadays, with the rapid development of network technology, people need a network technology that can support data transmission and power supply. The invention of power over Ethernet switches brings people a lot of conveniences because of their flexibility and reliability. Power over Ethernet switches has been applied in many applications to keep the network at peak utilisation. So what is power over Ethernet switch and how does it work? This post will give you the answer.

What Is Power Over Ethernet Switch and How Does It Work?

The power over Ethernet switch is also called the PoE switch. PoE switch belongs to a network switch or hub, it can not only transmit network data but also supply power to connected devices over one Ethernet cable at the same time, which can greatly simplify the cabling process and cut costs. At the same time, PoE technology is applied in different devices, such as IP cameras, IP access points and voice-over IP (VoIP) phones.

When a PoE switch is connected to a PoE-Capable device, it can detect automatically the same devices that you have. Each of the spare wire pairs of the PoE switch is treated as a single conductor and the electricity is injected into the cable. And PoE switch can sometimes be transmitted on the data wires by applying a common-mode voltage to each pair. Because the twisted pair Ethernet cable uses differential signalling, the voltage doesn’t interfere with the data transmission.

PoE switch, power over Ethernet switch

Figure 1: How Does Power over Ethernet Switch Work?

Common Power Over Ethernet Types

According to different ports, power over Ethernet switches can be grouped into three common types, they are 8-port,24-port and 48-port power over Ethernet switches. Different types differ in switching capacity, price and other aspects. For example, different PoE switches have different switching capacities and prices in FS. Different types of PoE switches also have different applications.

Confusing Questions About Power Over Ethernet Switch

1. What are the differences between PoE switches and normal switches?

They differ in reliability, function, cost and manipulation. Compared with normal switches which only support data transmission, power over Ethernet switches can support data transmission and power supply. Devices connected with power over an Ethernet switch don’t need to perform power supply wiring, which can save costs and simplify the whole network management.

2. What are the differences between PoE and PoE+?

Firstly, one difference between PoE and PoE+ is the actual Institute of Electrical and Electronics Engineers (IEEE) standards themselves. PoE is 802.3af, while PoE+ is 802.3at. The maximum capacity of PoE can reach 25.5 w, while the maximum capacity of PoE+ can reach 35.4 w. Secondly, the maximum support current of PoE is 350mA, while PoE+ is 600mA.

3. Can I use PoE ports for non-PoE devices?

Yes, you can. All PoE switches have auto-sensing PoE ports, which means that the PoE port will detect if the connected device is a PoE device or not. But you need to cheque whether your PoE device supports 802.3af or 802.3at because non-standard PoE switches don’t have auto-sensing PoE ports, which is more likely to damage the network port.

4. Do all Ethernet cables support  PoE?

Yes, nearly all Ethernet cables support PoE. PoE will work with existing cable, including Category 5e, 6,6a or 7.

Conclusion

It is without that power over Ethernet switches that significantly improve the efficiency of network devices. After reading the whole passage, you may likely have a general idea of PoE switches. FS provides different types of PoE switches for Ethernet PoE power supply and data communication. For more information, just reach us via sales@fs.com.

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Gigabit PoE Switch vs Normal Switch

PoE Switch vs. Normal Switch — Find the Right Switch for You

The telecommunication industry has always been developing with leaps and bounds and technology changes with each passing day. For people with little network knowledge, the evolving optional network devices like PoE switches can be a big puzzle. What is PoE? What is the difference between a PoE switch and a regular network switch? This article explains their differences and how to find the right switch for you.

What is PoE?

PoE, short for Power over Ethernet, is a technology that enables Ethernet cable to supply power. Thus power sourcing equipment (PSE) can transmit both data and power to powered devices (PD) simultaneously via one single cable. PoE has two standards available on network switches: IEEE 802.3af/at. The former original PoE standard, defined in 2003, provides a 15.4 W power budget to PDs (12.95 W available for accessing). The latter PoE+/PoE Plus standard defined in 2009 provides up to 30 W (25.5 W) power.

What is a PoE Switch?

PoE switch is one of the two types of PSE for PoE implementation: endspan switch and midspan PoE injector. To enhance network resiliency, gigabit PoE switches provided by FS.com are highly compatible with IEEE 802.3af/at managed PoE+ switches.

Also cheque – Unlocking the Secrets of PoE Switches – A Complete Guide

For example, FS S3150-8T2FP, an 8-Port Managed PoE+ switch, is equipped with 8x 10/100/1000BASE-T ports, 2x 1Gb SFP uplinks, 8x RJ45 ports support both IEEE 802.3af PoE and IEEE 802.3at PoE+ (up to 30W per port) for powering attached IP phones, wireless access points, or other standards-compliant PoE and PoE+ end network devices. 2x SFP uplink ports are provided to support connections to higher-layer devices.

Also cheque – cheque-FS PoE Switches

PoE Switch vs. Normal Switch: What’s the Difference?

In a word, the major difference between a PoE switch and a normal switch is PoE accessibility. A regular Ethernet switch is not PoE-enabled to supply power for end users over Ethernet. Therefore the user needs one extra cable to connect power outlets.

Also cheque – PoE Switch vs PoE Injector: Why Choose PoE Switch to Build Wireless Networks?

However, a normal switch can also become PoE-ready by employing a midspan injector between the switch and PDs. The injector will add electrical power while receiving the data signal from the Ethernet switch end cable, and then deliver both data and power to PDs. But in this circumstance, the injector also needs a wire for power.

When using a Gigabit PoE switch, only one power cable is required. Then the PDs can be directly plugged into the PoE gigabit switch port for both data transmission and power supply. The illustration and table below list the differences between deploying a PoE switch and a normal switch while adding PoE to networks.

 PoE SwitchNormal Switch
Required AccessoriesEasy for management (power and transmission)Require separate two wires for powering on the normal switch and PoE injector
PoE Access MethodUpgrade to PoE network by replacing the normal Ethernet switch with PoE Ethernet switchInstall PoE injector between switch and PDs to add PoE capability to the existing non-PoE switch
Emergency ReactionPotential chance of the whole system’s outageOnly one device be affected

Advantages of PoE Switches

As mentioned above, the PoE switch supplies power to PDs in the meantime of data delivery. Though the normal switch system can also acquire PoE by installing an injector, PoE endspan has the superiority of direct Power over Ethernet ability. Thus, the Gigabit PoE switch owns edges over the normal switch.

First, it enables PDs like IP surveillance cameras to be placed almost anywhere: on the ceiling, concealed in a wall, or even underwater while only one cable is needed to run to them. Second, it saves extra expenses and time for power cabling and injector installation. Third, with simplified cabling of all PDs directly connected to gigabit PoE switch, the data centre is easy to manage and control.

Besides, the PoE gigabit switch itself is designed with advanced features like high-performance hardware with software, auto-sensing PoE compatibility, strong network security, and environmental adaptability.

Find the Right Switch For You

Gigabit PoE switches can supply power to PDs in the meantime of data transmission via one single Ethernet cable while normal switches can only send data to them. For PoE implementation, normal switches need a power-on auxiliary injector as a midspan between a switch and powered devices.

Thus, PoE switches have the advantage of direct PoE connection, easy and flexible placement, cost-efficiency, simplified management, etc. For any applications of IP surveillance cameras, IP phones, and wireless APs, a PoE switch can be the right choice you’re looking for.

How to Add PoE to Your Network?

In data centres, there are a lot of electrical devices and each one requires a power supply cable and at least one connection wire for transmission. It’s a disaster to see all those wires scattering all over the floor and tangling together. To introduce Power over Ethernet technology, we can cut down the number of wire drops and simplify the management control. So what are the practical methods for adding PoE to your network? Read the following passage, to learn about the two solutions: adopting PoE switch or PoE media converter.

Overview of PoE Implement Method

PoE requires PoE-enabled networking devices for power supply on the Ethernet cable. To realise this technology, there are two types of power sourcing equipment (PSE) for adoption: endspan (IEEE 802.3af refers to it as “endpoint”) and midspan. Endspan is an Ethernet switch that has built-in PoE data transmission circuitry. A midspan is an intermediary device between a non-PoE switch and powered devices (PD). Thereinto PoE injector is a frequently used available external midspan device.

Adding PoE by PoE Switch (Endspan)

When you need to set up a new Ethernet network with power over Ethernet technology or you want to upgrade the system and replace older non-PoE switches, employing Endspan is a good choice. How to add PoE to your network by PoE switch? Just connect it to other network devices, and the switch itself will figure out whether they are PoE-supportable devices and control power automatically. There are various types of PoE switches available, ranging from “dumb” unmanaged ones, smart partly managed ones and fully managed ones with advanced management. It also varies from port quantity, such as 8, 16, 24 and 48 ports.

It is noted that the PoE+ switch is a PoE plus switch for providing up to 30W power consumption. For example, the FS S3150-8T2FP 8 port PoE switch is a managed PoE+ switch with 2 SFP ports, IEEE 802.3at complied and IEEE 802.3af backwards compatible. It has a maximum power supply of 130W and a switching capacity of 20Gbps. FS S3150-8T2FP supports various PoE devices and is the best fit for network equipment such as wireless APs, IP phones and IP cameras.

Adding PoE by PoE Media Converter (Midspan)

If you don’t want to discard your already used network switch and only PoE capability is needed to be added, you can simply adopt midspans. A PoE media converter is a device that can add electrical power while receiving a signal from one end of the cable, and then deliver both the data signal and the power via the other end of the cable. Instead of a PoE switch, a media converter can also be used as an economical and functional solution where only a few PoE ports are in demand. How to add PoE to your existing LAN by PoE media converter? First, power on the PoE media converter and non-PoE Ethernet switch respectively, and next, connect them via an Ethernet cable. Then connect PDs such as IP phones with a PoE media converter and finally, the system can run as a whole.

In the case of older end devices that are not PoE-ready, a splitter can help add PoE to your network. To apply a splitter onto the end of the Ethernet cable will enable signal and power to be split into two different lines.

PoE switch vs PoE injector installation

This figure shows the installation of the PoE switch vs the PoE media converter for adding PoE to the network.

PoE Switch or PoE Media Converter: Which to Employ?

After diving into each respectively, we made a comparison of the PoE switch vs the PoE media converter concerning adding PoE to the network.

PoE Switch PoE Media Converter
Price Higher Cost Economical
Management and Control Easy for management (power and transmission) Requiring separate two wires for powering on the switch and PoE media converter
Implement Method Upgrade to PoE network by replacing the old Ethernet switch with PoE switch install l PoE media converter to add PoE capability to the existing non-PoE switch
Emergency Reaction Potential chance of the whole system’s outrageously y one device be affected

For most concerns about cost-efficiency and PoE capability required, you can go for a PoE media converter. However, for upgrading the system and future-proofing superior functionality concerns, the PoE switch is a better choice.

Conclusion

Both the PoE switch and PoE media converter are power-sourcing equipment for adding PoE to a network. PoE switch is an endspan, naturally fitting for a new set-up or upgrade-needed network. PoE media converter is a midspan, better fitting for existing non-PoE networks without switch replacement requirement. For PoE switch purchases, FS is a reliable vendor providing a wide range of types for different demands. For any other information to know, just visit our official website and blog.

Attention: The products mentioned in this article may have unstable availability due to timing issues. For further information, please visit www.fs.com and consult our online customer service.

Understanding PoE & PoE Switch

Enterprises are quickly evolving with new network devices to improve communication and security. Power over Ethernet (PoE), a way to deliver electrical power over LAN cables to network devices, has been widely deployed to provide power to various endpoints in enterprise environments. If you want to upgrade your network to PoE, one way is to deploy a PoE switch. This paper will provide an overview of the PoE technology and PoE switches.

What Is a PoE in Networking?

Power over Ethernet, also known as PoE, is a networking feature defined by the IEEE 802.3af and 802.3at standards. PoE can combine the two connections into one Ethernet cable so that a single network cable will transmit both data and 25W of electricity. In this way, it can minimise the number of wires when installing the network, which realises the lower cost, less downtime, easier maintenance, and greater installation flexibility in networking.

POE-working-principle

Why Use PoE?

Because PoE is allowed to use one cable for both power and data transmission, PoE can save money on purchasing and running cable for networking equipment. It can bring many advantages to the network as follows.

  • Time and cost savings

Network cables do not require a qualified electrician to install them, and can be located anywhere, so PoE eliminates the time and cost of hiring professional electrical installers.

  • Flexibility

Network administrators can deploy devices (eg: IP cameras and wireless access points) wherever they are needed most, and redeploy easily if required.

  • Safety

Because PoE utilises a relatively low voltage, it presents low risks of electrical hazards.

  • Scalability

PoE makes it simple to add new equipment to a network.

What is a PoE Switch Used for?

A POE switch is a network switch that has a built-in PoE injection. It can connect to other network devices as normal, and the switch will detect whether they are PoE-compatible and enable power automatically. PoE switches are available to suit all applications, ranging from low-cost unmanaged edge switches with a few ports, to complex multi-port rack-mounted units with sophisticated management. They can run PoE up to 100 metres from the switch or hub to the NIC, regardless of where the power is injected. The limitation is not the power, it’s the Ethernet cabling standards that limit the total length of cabling to 100 metres.

POE Switch

FS PoE Switch Solution?

FS provides fully managed PoE switches, which are available with 8, 24 or 48 PoE Gigabit Ethernet ports of auto-sensing IEEE 802.3af/at. The PoE Switches are ideal for small business networks that need to inexpensively use PoE to deploy wireless access points and IP-based network surveillance cameras. They deliver robust performance and intelligent switching for growing networks, so PoE switches will be the best choice to install and manage your devices. The model details of FS’s PoE switches are listed below.

fs-poe-switches

How to Ensure Successful PoE Deployments?
1. Provide Sufficient Power to the Remote Powered Device

According to the IEEE 802.3af standard, the powered remote device can draw up to 12.95 watts of power. Considering the loss of the cable length, the power sourcing equipment (PSE) must have the ability to provide 15.4 watts of power to each port. For example, a 24-port Ethernet switch needs approximately 370 watts of power to supply the necessary power to each port. The PoE switches should have more than 370 watts available given the size of the power supply used in each device. It depends on how much power their switching functions require.

2. Connect the Power Source to Uninterruptible and Redundant Power

Connect the critical power-sourcing devices to an uninterruptible power supply, and use devices with dual redundant power supplies to ensure that your critical devices never lose power.

3. Deploy Only IEEE 802.3af-Compliant Devices

Carefully read the technical documentation and contact the technical support number to determine compatibility. Failure to do so will leave you frustrated and will cost you time and money.

4. Pay Attention to Cabling-performance Specifications

Pay close attention to the manufacturer’s specifications and look for Cat5e and Cat6a compliance. Also, you should remember per TIA standards, only four connectors can exist between the switch or hub and the network interface card (NIC). A midspan device should be counted and treated as one of these connection points.

5. Use the Most Cost-effective PoE Method for Your Network

The business motivation behind deploying IP-based technologies like WiFi and VoIP is to decrease networking costs. A significant benefit of PoE is that it runs on your existing infrastructure.

Conclusion

PoE is a recently developed technology, and it simplifies enterprise deployment with lower operating expenses, higher availability, and faster deployment. FS has provided PoE switches in a variety of specifications, such as 8 port Poe switches, 24 port PoE switches and 48 port PoE switches, which may make your trip as comfortable as possible. For more information, please welcome to www.fs.com.

Related Article: Power over Ethernet Analysis

Why Is Managed Switch Good for Business Networks?

A network is a foundation to connect storage, servers, printers, PCs, and wireless clients with business-critical applications to enhance productivity and customer satisfaction. And network switches are like the tyres of a car. Without them, the “car” cannot work normally. No matter the large enterprises, or small and midsize businesses, their systems and applications are interconnected and rely on the network. Today’s post is to introduce the managed switch and why it is important for business networks.

Managed Switches Basics

A managed switch is a type of Ethernet switch that has a fixed number of ports. It is designed to deliver the most precise control and management of networks. They are usually deployed in large networks or as core switches in relatively smaller networks. To introduce the basics of a managed switch in detail, here take the 24 port PoE switch as an example (as shown in the below picture).

24 ports managed business PoE switch

As shown in the picture, there are three types of ports on this switch: PoE port, SFP port and console port. The number of PoE ports is 24, and they can provide both power and data transmission. There are four SFP ports which include two Gigabit combo ports. These ports can connect with SFP fibre transceivers to uplink to the backbone switch at a long-distance location. The last kind of port is the console port which is for effective management. With a total power budget of up to 220 watts, this managed business Gigabit PoE switch provides a quick, safe and cost-effective Power over Ethernet network solution for small businesses and enterprises.

Benefits of Managed Switches

People who have work experience with switches know that unmanaged switches and managed switches are two common Ethernet switches in networking. And unmanaged switches seem to be a better choice in terms of cost. Therefore, maybe many business owners would ask, compared with managed switches, unmanaged switches are more cost-effective. Why do I need to choose a more expensive switch? Well, managed switches have other features which are more beneficial for your networks.

managed switch in network

Using SNMP (Simple Network Management Protocol) for Better Network Monitor

SNMP is a protocol that facilitates the exchange of management information between network devices. SNMP queries also can help cheque the health and status of devices in a network. Data displayed in an easily understood format is good for IT managers to monitor the performance of the network from a remote location. And it also helps to repair the problems without inspecting the switches or devices personally.

Port Monitoring for Troubleshooting

The function of the port monitoring feature of managed switches is to diagnose problems effectively. It copies the switch network traffic and forwards it to a single port on the same switch for analysis by a network analyser. Problems can be found by using the analyser on the monitor port without switching off the network.

Quality of Service (QoS) to Prioritise Your Network Traffic

This feature of managed switches allows you to prioritize your network traffic by assigning a higher priority to the critical traffic, which is beneficial to improve network performance and transmit delay-sensitive data such as real-time voice.

Apart from the features mentioned above, managed switches also have two features that cannot be ignored. One is that switches can be used in VLAN (Virtual Local Area Network) configuration to logically group devices as per the working departments, and managed switches can be used to isolate traffic between these groups, which allows better network performance and an additional level of security. Another one is redundancy which can protect the network when connection failures occur.

Conclusion

Managed switches, especially managed PoE switches, offer great expandability for growing business networks. With business network growth on the horizon, having a clear evaluation of the network requirements is important. If you want to have some input and control over the behaviour of traffic on their LAN, or if you plan to deploy advanced services such as wireless LANs or IP telephony, managed switches are a good choice to realise them. For more information about managed switches, please contact us via sale@fs.com.

Fundamentals of Power over Ethernet (PoE)

With the introduction of new Ethernet-enabled devices expanding geometrically, the need to power these devices from standard AC power outlets has become a limiting factor. IP phones, wireless access points, IP cameras and device servers are examples of devices limited by the need to have an AC power outlet nearby to plug in a DC power adaptor. At best, power supply installation and wiring add labour and result in the mess of extra wiring; worst case, the lack of nearby AC power means devices cannot be installed where they are needed.

In response to this need, IEEE developed IEEE802.3af to standardise a system of supplying low-voltage power to networked devices via the communications line. It is more commonly referred to as Power over Ethernet (POE). This article focuses on introducing some fundamental elements of PoE.

Basic Concepts of PoE

PoE is defined across a single network link that includes three basic components. The first one is equipment delivering power to the cable (often referred to as a PSE, which stands for power sourcing equipment). The second component is a device receiving power from the cable (also known as a powered device, or PD). The third is the cable itself.

Typical PDs include IP cameras and wireless access points, and the PSE would normally be a PoE switch or a midspan power injector, patched in to add PoE capability to a non-PoE network switch channel or similar. These two configurations are shown in the following picture.

PoE

Advantages of PoE

The most prominent advantages of PoE are time-saving and cost-effective. By reducing the time and expense of having electrical power cabling installed, network cables do not require a qualified electrician to fit them, thus they can be located anywhere. Besides, it has great flexibility. Without being tethered to an electrical outlet, the PDs (IP cameras, wireless access points) could be located wherever they are needed most. Safety is the third advantage. PoE delivery is intelligent and it is designed to protect network equipment from overload, or incorrect installation. Also, it has reliability and scalability. PoE power comes from a central and universally compatible source, rather than a collection of distributed wall adapters. It can be backed up by an uninterruptible power supply, or controlled to easily disable or reset devices.

Applications of PoE

The original PoE application is VoIP phones, which have a single connection to a wall socket and can be remotely powered down, just like with the older analogue systems. PoE could also be used in IP cameras. It is ubiquitous on networked surveillance cameras where it enables fast deployment and easy repositioning. Wifi and Bluetooth APs and RFID (radio frequency identification devices) readers are commonly PoE-compatible, to allow remote locations away from AC outlets, and relocation following site surveys.

How PoE Works

PoE is designed to operate over standard network cable: Cat 5e, Cat 6, Cat 6a or Cat 7 (often collectively referred to as Cat 5e), using conventional RJ45 connectors. The principles of carrying electrical power over Cat5e are of no difference to those of other power distribution systems, but as the power is being transferred over light-duty cable for long distances, the effects of the power loss and voltage drop become significant.

The arrangement and connection to the cabling used for PoE also differ slightly from conventional power wiring, to work around the existing standard for Ethernet data. Cat 5e network cables contain a bundle of eight wires, arranged as four twisted pairs shown in the following picture. In the most common type of Ethernet, 100BASE-T or Fast Ethernet, only two of the four pairs are used to carry data; each pair carrying a signal in one direction. These are known as the data pairs, and the remaining two are unused and are referred to as the spare pairs.

PoE working

Although each data signal can be carried within a single pair, PoE treats each pair of wires as a single conductor (a reason for this is that using both wires halves the overall resistance). As electrical current must flow in a loop, two pairs are required to allow power to be carried by the cable, and either the data or spare pairs can be used for this. The PD must be able to accept power from whichever pairs the PSE delivers it to.

Conclusion

PoE is a convenient and now ubiquitous method for delivering power to a wide variety of loads on standard Cat 5e Ethernet cables. There is no doubt that Power over Ethernet will become increasingly important shortly.