why Power over Ethernet (PoE) is amazing!! // FREE CCNA // EP 12

NetworkChuck
14 Mar 202119:39

TLDRThis video explores the marvels of Power over Ethernet (PoE), a technology that delivers both power and data through a single Ethernet cable, revolutionizing the deployment of devices like IP phones and security cameras. The host delves into PoE's history, types, and standards, from Cisco's early implementation to the IEEE's 802.3af and beyond. Viewers learn about active vs. passive PoE, the importance of power negotiation, and witness a live demo of PoE in action, showcasing its efficiency and potential to power an expanding array of networked devices.

Takeaways

  • 🔌 Power over Ethernet (PoE) allows both power and data to be transmitted over a single Ethernet cable, simplifying installations.
  • 📞 PoE was initially developed by Cisco to eliminate the need for separate power cables for devices like IP phones.
  • 🛠️ The first PoE standard, IEEE 802.3af, was ratified in 2003 and provided up to 15.4 watts of power, known as Type 1 PoE.
  • 🚀 PoE Plus, or IEEE 802.3at, increased the power output to 30 watts per port, known as Type 2 PoE, enabling the powering of more devices.
  • 🔋 Cisco introduced Universal Power over Ethernet (U-PoE) in 2011, providing up to 60 watts, but it was proprietary to Cisco at the time.
  • 🔌 The 802.3bt standard, also known as PoE++ or 4PPoE, uses all four pairs of wires to deliver up to 60 watts, known as Type 3 PoE.
  • ⚡ PoE++ (802.3bt Type 4) further increased the power to 90 watts, allowing for the powering of devices like laptops and building lighting.
  • 🤖 PoE is not just for phones and access points; it's expanding to power a wide range of devices, including computers and HVAC systems.
  • 👷‍♂️ The use of PoE reduces the need for electricians, as network engineers can handle the installation of devices that use PoE.
  • 🔍 There are two types of PoE: active, which negotiates power output with the device, and passive, which provides power without negotiation.
  • 🛑 If a device attempts to draw more power than the port is configured to provide, the port will shut down and log an error message.

Q & A

  • What is Power over Ethernet (PoE) and why is it considered amazing?

    -Power over Ethernet (PoE) is a technology that allows both power and data to be transmitted over Ethernet cables to devices such as phones, wireless access points, and security cameras. It is considered amazing because it simplifies the deployment of these devices by eliminating the need for separate power cables, reducing installation costs and effort.

  • Who is credited with the invention of PoE and when was it first introduced?

    -Cisco is credited with the invention of PoE. The technology was first introduced in the year 2000 under the name Cisco Inline Power.

  • What does PSE stand for in the context of PoE?

    -In PoE terms, PSE stands for Power Sourcing Equipment, which is the device that provides power to the end device over the Ethernet cable.

  • What is the term for the end device that receives power over an Ethernet cable?

    -In PoE terms, the end device that receives power is referred to as a PD, or Powered Device.

  • How did the initial PoE technology utilize the Ethernet cable?

    -The initial PoE technology utilized the wires in the Ethernet cable that were not being used for data transmission, specifically the wires connected to pins 4, 5, 7, and 8.

  • What is the IEEE standard that was ratified in 2003 for PoE?

    -The IEEE standard that was ratified in 2003 for PoE is 802.3af.

  • What is the difference between Type 1 PoE and Type 2 PoE in terms of power output?

    -Type 1 PoE, also known as 802.3af, provides power up to 15.4 watts, while Type 2 PoE, or PoE+ (802.3at), doubles the power output to up to 30 watts per Ethernet port.

  • What is the purpose of the Cisco Discovery Protocol (CDP) in PoE?

    -CDP is used by Cisco devices to negotiate with the end device to determine the appropriate amount of power to supply. This ensures that the device receives neither too little nor too much power, preventing potential damage.

  • What is the term used for PoE that does not negotiate power levels and provides constant power?

    -The term used for PoE that does not negotiate power levels and provides constant power is Passive PoE.

  • What is the latest standard for PoE as mentioned in the script and what power does it provide?

    -The latest standard mentioned in the script is 802.3bt, also known as PoE++ or Type 4 PoE, which provides up to 90 watts of power.

  • What is the significance of the 24-volt PoE and which brand supports it?

    -24-volt PoE, also known as passive PoE, provides a constant 24 volts of power to all connected devices without negotiation. Ubiquiti is a brand that supports this type of PoE.

  • How does the power availability on a switch affect the operation of PoE devices?

    -The total power available on a switch determines how many PoE devices can be powered simultaneously. If the switch does not have enough wattage to supply all connected devices with their required power, some devices may not power up or may shut down.

Outlines

00:00

🔌 Introduction to Power over Ethernet (PoE)

The script begins with an introduction to Power over Ethernet (PoE), a technology that allows both power and data to be transmitted over a single Ethernet cable. The presenter expresses excitement about PoE and its ability to power devices like iPhones and Cisco IP phones with a single cable. The video promises to delve into the technical aspects of PoE, including a look at Cisco's command-line interface (CLI) for switches. The sponsor, Boson Software, is acknowledged for their support and for providing resources for IT certification exams. A bonus question related to PoE from a CCNA practice exam is also teased for the end of the video.

05:00

📡 The Evolution and Standardization of PoE

This paragraph covers the history and development of PoE, starting with Cisco's invention of the technology in 2000 under the name 'Cisco Inline Power'. It explains how PoE initially used spare wires in Ethernet cables to transmit power and how the IEEE standardized the technology in 2003 with the 802.3af standard, allowing up to 15.4 watts of power. The script discusses the evolution of PoE standards, including PoE Plus (802.3at) which doubled the power output to 30 watts, and Cisco's proprietary Universal Power over Ethernet (U-PoE), which offered 60 watts and later became the IEEE 802.3bt standard, known as Type 3 PoE.

10:00

🔧 Practical Applications and Power Negotiation in PoE

The script discusses the practical applications of PoE, emphasizing the convenience of using a single cable for both power and data, which reduces the need for electricians and simplifies installations. It also explains the quest for more power, leading to the development of Type 4 PoE (802.3bt), which can deliver up to 90 watts. The video introduces the concepts of active and passive PoE, where active PoE involves negotiation between the switch and the device to determine the appropriate power level, while passive PoE provides a constant power supply without negotiation. The importance of this negotiation is highlighted to prevent devices from receiving too much power and getting damaged.

15:01

🛠 Hands-on Demonstration of PoE with Cisco CLI

The final paragraph focuses on a hands-on demonstration using Cisco Packet Tracer to show PoE in action. The presenter guides viewers through the process of connecting Cisco phones to a Cisco switch and using commands in the CLI to monitor the PoE process. The 'show power inline' command is introduced to check the power usage and availability on the switch. The script also touches on a real-world scenario where the presenter encountered issues with powering devices due to insufficient wattage available on the switch. The video concludes with a Boson CCNA practice exam question related to PoE, reinforcing the concepts covered throughout the script.

Mindmap

Keywords

💡Power over Ethernet (PoE)

Power over Ethernet, commonly known as PoE, is a technology that allows network cables to carry both data signals and electrical power simultaneously. This is crucial for devices like IP phones and wireless access points that require both internet connectivity and power to operate. In the video, PoE is described as 'amazing' due to its ability to simplify the deployment of network devices by eliminating the need for separate power cables.

💡Ethernet

Ethernet is a family of computer networking technologies commonly used in local area networks (LAN) for wired communication between devices. It defines a number of wiring and signaling standards for the physical layer of networks. In the context of the video, Ethernet cables are used not only for data transmission but also for powering devices through PoE.

💡PSE (Power Sourcing Equipment)

PSE stands for Power Sourcing Equipment, which is the device that provides power in a PoE setup, typically a network switch. The video explains that the PSE is the source of power for other devices, such as IP phones, which are then able to operate without the need for a separate power supply.

💡PD (Powered Device)

PD refers to Powered Device, which is any device that consumes power from the PSE in a PoE configuration. Examples of PDs include IP phones and wireless access points. The script mentions that these devices can now receive both data and power through a single Ethernet cable, thanks to PoE technology.

💡IEEE 802.3af

IEEE 802.3af is the first standard for PoE, ratified in 2003. It defines the power sourcing methods and power levels for devices that comply with this standard. The video mentions this standard as a significant step towards the widespread adoption of PoE technology, allowing for up to 15.4 watts of power delivery.

💡PoE Plus

PoE Plus, also known as IEEE 802.3at, is an enhancement to the original PoE standard that allows for higher power delivery, up to 30 watts per port. This increase in power capacity enables the powering of more sophisticated devices. The video script highlights PoE Plus as a common standard that has become ubiquitous in modern networking environments.

💡Cisco Inline Power

Cisco Inline Power is the original term used by Cisco for their proprietary PoE implementation before the IEEE standard was established. The script mentions that even though PoE has become standardized, Cisco devices still use the term to reflect their pioneering role in the development of this technology.

💡Ubiquiti

Ubiquiti is a brand mentioned in the video that produces networking equipment, including switches that support various PoE standards. The video script uses Ubiquiti as an example of a brand other than Cisco that has adopted PoE technology, showcasing the widespread industry acceptance of this standard.

💡Active PoE

Active PoE is a type of PoE where the PSE negotiates with the PD to determine the appropriate amount of power to supply. This is important to prevent over-powering a device, which could damage it. The video explains that active PoE uses protocols like CDP (Cisco Discovery Protocol) or LLDP (Link Layer Discovery Protocol) for this negotiation process.

💡Passive PoE

Passive PoE, in contrast to active PoE, provides a constant power supply without negotiation. It does not adjust the power output based on the device's needs, which can be risky if a non-PoE device is connected. The script warns about the potential dangers of using passive PoE, such as the possibility of damaging devices not designed to receive power over Ethernet.

💡Boson Software

Boson Software is mentioned in the video as a sponsor and a provider of study materials for IT certification exams, such as CCNA, CCNP, and others. The script encourages viewers to check out Boson's resources, including practice exams and courseware, to prepare for certification exams, indicating the company's relevance to the video's audience.

Highlights

Power over Ethernet (PoE) allows for both power and data to be transmitted over a single Ethernet cable.

PoE was initially developed by Cisco to power IP phones and has since become a standard for various devices.

Cisco's proprietary PoE system, Cisco Inline Power, was later standardized as IEEE 802.3af.

802.3af PoE standard provides up to 15.4 watts of power, extending support to more devices.

The quest for more power led to the development of PoE Plus, standardized as IEEE 802.3at, offering 30 watts per port.

Cisco's Universal Power over Ethernet (U-PoE) can deliver up to 60 watts, using all four pairs of wires in the Ethernet cable.

IEEE 802.3bt, also known as PoE++ or 4PPoE, doubles the power to 60 watts and is used for powering larger devices.

PoE++ (802.3bt) is referred to as Type 4 PoE, providing up to 90 watts for even more powerful applications.

PoE simplifies installations by eliminating the need for separate power and data cables, reducing costs and complexity.

Active PoE negotiates power requirements with the device to prevent over- or under-powering, unlike Passive PoE which provides constant power.

Cisco Discovery Protocol (CDP) and Link Layer Discovery Protocol (LLDP) are used for power negotiation in Active PoE.

PoE has applications beyond phones and access points, including powering security cameras, computers, lighting, and HVAC systems.

Boson Software is highlighted as a valuable resource for CCNA, CCNP, and other IT certification exam preparation.

The video includes a practical demonstration of PoE using Cisco Packet Tracer and a real Cisco switch.

A real-world scenario of PoE deployment issues, such as insufficient power availability on a switch, is discussed.

The video concludes with a practice exam question from Boson's CCNA exam preparation material related to PoE.

The future of PoE is envisioned with the potential to power entire buildings with Ethernet cables instead of traditional power lines.

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