How Much Do You Know About PoE?

People’s increasing demand for more data traffic and higher data speed promotes the evolution of communication technology. The size of data center becomes larger and cabling system becomes more complicated. Recently, home network deployment springs up and a new network technology becomes a hot spot topic—PoE (Power over Ethernet). How much do you know about it? Do you use PoE devices? This article will focus on things related to PoE.

PoE

PoE technology allows network switches to transmit both power and data through an Ethernet cable at the same time. Take digital security camera for example. A digital security camera normally requires two connections to be made when it is installed: a network connection and a power connection. The former one makes the camera communicate with video recording and display equipment, while the latter one delivers the electrical power for the camera. However, if the camera is POE-enabled, only the network connection needs to be made, as it will receive its electrical power from this cable as well. Some equipment in home network usually use PoE, such as VoIP phone, IP camera and wireless access point.

POE applications

PoE+

If you use PoE devices, you must have noticed that there are PoE+ devices on the market. What is the difference between them? PoE devices utilize the original PoE standard, IEEE 802.3af, which provides up to 15.4W of DC power to each device. While PoE+, also known as PoE class 4, is the latest standard, IEEE 802.3at, which provides up to 30W of power to each device. That’s to say PoE+ can provide almost twice as much power as PoE over a single Ethernet cable. High-powered IP devices such as PTZ cameras use PoE+. In addition, compatible NVRs use integrated PoE+ ports to provide power and PTZ commands to the camera, as well as video connection to the NVR.

PoE Switch

A PoE switch is a network switch that has Power over Ethernet injection built-in. It is straightforward to add PoE to your network. Simply connect other network devices to the PoE switch as normal, and the switch will detect whether they are POE-compatible and enable power automatically. PoE switches are available to suit all applications, from low-cost unmanaged edge switches with a few ports, up to complex multi-port rack-mounted units with sophisticated management.

PoE Switch

Advantages of PoE

PoE technology brings several advantages to home network deployment:

Time and Cost Savings: A single Ethernet cable can support both data and power transmission. Besides, running Ethernet cable does not require a qualified electrician, it can be done by yourself.

Flexibility: Without being tethered to fixed power outlet, there are more placement options for devices such as IP cameras and wireless access points, and they can be repositioned easily if required.

Safety: PoE delivery is intelligent, and designed to protect network equipment from overload, underpowering, or incorrect installation.

Reliability: 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.

Scalability: Having power available on the network means that installation and distribution of network connections is simple and effective.

Conclusion

PoE technology realizes the power and data transmission over the same Ethernet cable at the same time, which makes home network deployment more convenient. FS.COM provides high quality PoE switches and all of them come with a one-year limited warranty, including any quality problems during the free maintenance.

Originally published at: http://www.fiberopticshare.com/how-much-do-you-know-about-poe.html

Advertisements

How to Choose the Right Ethernet Cable for Your Network?

To build your Ethernet network, the transmission media Ethernet cable is indispensable. And there are a variety of choices for Ethernet cables, such as Cat5e, Cat6, Cat6a and so on. If you are familiar with the differences between these different types of Ethernet cables, you may think it’s very simple to choose the right Ethernet cable for your network. However, is this really enough to help you make the decision? Are there any other factors you have to take into consideration? This article will give you the answer.

Overview of Different Types of Ethernet Cables

First, let’s have a quick review of the basic knowledge of these different types of Ethernet cables. For data speed, Cat5e is designed to support 1 Gigabit Ethernet with bandwidth up to 100MHz; Cat6 can support higher data rate of 10 Gigabit Ethernet with bandwidth up to 250 MHz; Cat6a is defined at frequencies up to 500MHz among 10G Ethernet applications. For transmission distance, Cat5e can reach 100 meters at the speed of 1Gbps; Cat6 is able to run 100 meters with data speed up to 1Gbps and only 55 meters at the speed of 10Gbps; Cat6a can support the distance over 100 meters at the speed of 10Gbps. Which types of Ethernet cables to choose depends on your requirement for transmission speed and distance. After you make a decision on this, there are some other factors you have to consider—straight-through or crossover cable, UTP (unshielded twisted pair) or STP (shielded twisted pair) cable, length and color. The following part will focus on these factors.

Straight-Through or Crossover Cable?

Ethernet cable terminated with RJ45 connector contains eight color-coded wires. The color-coded wiring sequences exist as a cabling industry standard. When linking RJ45 connector to a cable, there are two wiring standards—T-568A and T-568B. The two wiring standards are used to create a straight-through cable (T-568A or T-568B on both ends), or a crossover cable (T-568A on one end and T-568B on the other end). To choose a straight-through cable, you have to use either T-568A or T-568B on both ends of the cable; to choose a crossover cable, you need to wire T-568A on one end and T-568B on the other end of the cable. Here is a figure of T-568A and T-568B, from which you can see the difference between these two wiring standards.

T-568A and T-568B

UTP or STP Cable?

STP cable has a metal shield around each twisted pair which is composed of copper tape, a layer of conducting polymer or a braid (mostly made of copper or aluminum). With the shield, EMI (electromagnetic interference) and crosstalk can be greatly reduced, which enables the high performance of data transmission between different devices. While UTP cable has no shielding. It is designed to cancel electromagnetic interference through the way the pairs are twisted inside the cable. If the Ethernet cable runs in the environment where the interference or crosstalk is not the main concern, it is suggested to choose UTP cables which are lower in cost. But if the environment is full of powerful magnetic fields which may have an influence on the performance of network, STP cable is absolutely the optimal choice. To have a better understanding of the difference between UTP cable and STP cable, here is figure of the inner structure of UTP cable and STP cable.

the inner structure of UTP cable and STP cable

Length and Color

When choosing Ether cable for your network, you also need to consider length and color. Ethernet cable comes in standard lengths such as 1, 3, 5, 7, and 10 meter. Longer lengths are available, such as bulk Cat5e cable 305m. The distance between your various network devices and your network switch or router will determine the length you need. In addition, Ethernet cable is designed in all sorts of colors, such as blue, gray, red and some other color. This decision can be based purely on your individual taste and preference.

Conclusion

There is no doubt that choosing the right Ethernet cable can make your network work at a high performance level. I hope this article can help you know more about Ethernet cable and make the right choice for your network application. There are different types of Ethernet cables available in FS.COM, such as UTP Cat5e bulk cable, STP Cat6 bulk cable and so on. Also, they have different types of RJ45 couplers which can be a convenient way to combine two short Ethernet cables into a longer one, such as Cat6 coupler and Cat5e coupler.