Power over Ethernet (PoE) is a system that provides a constant supply of DC power to a computer network using the same Ethernet cables used for connectivity. Devices such as network cameras and IP telephones can hence be powered without the need for extra wiring. PoE is easy to maintain and requires little or no human intervention. Another name for PoE is Power over LAN (PoL).
In order for Power over Ethernet to work effectively, the electrical current must flow through the data cable at the main supply entrance and out through the device end to avoid any interference between data and power supply. In case the device at the end of the cable is not PoE synced, then another hardware called a picker needs to be put in place.
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What is an Ethernet Switch and Crossover Cables
A switch is something that is used to turn on or off various electronic devices. However, in computer networking, a switch is used to connect multiple computers with each other. Since it is an external device it becomes part of the hardware peripherals used in the operation of a computer system. This connection is done within an existing Local Area network (LAN) only and is identical to an Ethernet hub in terms of appearance except with more intelligence. These switches not only receive data packets, but also have the ability to inspect them before passing them on to the next computer. That is, they can figure out the source, the contents of the data, and identify the destination as well. Because of this uniqueness; it sends the data to the relevant connected system only, thereby using less bandwidth at high performance rates.
Ethernet Switches and Crossover Cables
The wires in a crossover cable are "crossed" so that output signals from the transmitting device are properly sent as input signals to the receiving end. An Ethernet switch can be thought of as a device that makes temporary crossover cable connections between computers that want to communicate. Just like crossover cables, switches do not suffer from the problem of collisions.
However, it should be noted that the actual cables used are "straight through". The crossover function is done inside of the switch.
Since separate wires are used for sending and receiving, switches support operation in full duplex mode. This mode allows devices to send and receive data at the same time.
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Ethernet Switches and Crossover Cables
The wires in a crossover cable are "crossed" so that output signals from the transmitting device are properly sent as input signals to the receiving end. An Ethernet switch can be thought of as a device that makes temporary crossover cable connections between computers that want to communicate. Just like crossover cables, switches do not suffer from the problem of collisions.
However, it should be noted that the actual cables used are "straight through". The crossover function is done inside of the switch.
Since separate wires are used for sending and receiving, switches support operation in full duplex mode. This mode allows devices to send and receive data at the same time.
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What is an Ethernet Hub
For any two devices to be connected, they need a common place, or a hub, as it is called in the computer world. It basically connects multiple computers together. Most of the hubs available in the market today support Ethernet standards. This is why they are called Ethernet hubs, and are most commonly used in computers for networking purposes at home.
Ethernet hubs are available in different types, depending on the speed of the network connection or broadband speed. Also, the number of ports supported by the hub varies, there are some that support only one port whereas others with eight or more ports are common in large offices with many computers inter-connected. The newer range of hubs found in the market are relatively smaller and don't make any noise as against the ones used in early days which had a built in fan to keep the system cool.
Ethernet Hubs – How they Work
The main purpose of the Ethernet hub is to transmit the large pockets or cluster of data it receives from one computer onto another through all the ports connected to it. The only drawback of this system is that data can be transferred from only one system at a time. If there are multiple systems sending out data to others, it is likely that a collision will occur. A good analogy could be that of a road with one-way traffic: vehicles coming in the wrong direction might cause chaos.
Some of the Ethernet hubs available come with a screen that displays network usage information, which lets the user know how much data is being transferred between computers. A hub is usually placed in a corner or in a place where there is not much of movement as any kind of motion can disrupt its services. Hubs are found in almost all computer networks today, including those in homes that interconnect computers for internet usage.
Posted by: Wasim Javed
Ethernet hubs are available in different types, depending on the speed of the network connection or broadband speed. Also, the number of ports supported by the hub varies, there are some that support only one port whereas others with eight or more ports are common in large offices with many computers inter-connected. The newer range of hubs found in the market are relatively smaller and don't make any noise as against the ones used in early days which had a built in fan to keep the system cool.
Ethernet Hubs – How they Work
The main purpose of the Ethernet hub is to transmit the large pockets or cluster of data it receives from one computer onto another through all the ports connected to it. The only drawback of this system is that data can be transferred from only one system at a time. If there are multiple systems sending out data to others, it is likely that a collision will occur. A good analogy could be that of a road with one-way traffic: vehicles coming in the wrong direction might cause chaos.
Some of the Ethernet hubs available come with a screen that displays network usage information, which lets the user know how much data is being transferred between computers. A hub is usually placed in a corner or in a place where there is not much of movement as any kind of motion can disrupt its services. Hubs are found in almost all computer networks today, including those in homes that interconnect computers for internet usage.
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The Straight Cable,The Crossover Cable and Color Coding Of The Wires
The Straight Cable
The straight cable is a through cable, and it connects to the switch or hub. These cables function as the patch cords in an Ethernet connection. Both ends of these wires are the same. The TIA/EIA 568A standard has been replaced by TIA/EIA 568B. However, both cable standards are still used. They are similar, but are not the same. Both standards use unshielded twisted pair cables.
The Crossover Cable
The crossover cable formation can be used without a hub or switch. It is used in a peer-to-peer connection. It is used when one needs to connect two Ethernet devices together without a hub or switch. It can also be used to connect two hubs to each other. The simplest way to achieve this is to use the 568 A at one end and the 568B at the other end of the RJ45 plug.
Color Coding Of The Wires
There are a total of eight wires inside the cable, twisted into four pairs. Each pair has a primary solid-colored wire and another one with a primary white with a colored stripe running through its center. The stripe in the pair is of the same color as the solid color. The pinout for the cable 568A going from position one (that is, the wire that is attached to pin 1 of the RJ45 plug) is white/green, green, white/orange, blue, blue/white, orange, white/brown, brown, and that for the 568 B is white/orange, orange, white/green, blue, white/blue, green, white/brown, and brown. The easiest way to remember how to wire a crossover cable is to switch the set of wires, that is, to switch the solid green and the solid orange and the white/green and the white/orange.
Posted by: Wasim Javed
The straight cable is a through cable, and it connects to the switch or hub. These cables function as the patch cords in an Ethernet connection. Both ends of these wires are the same. The TIA/EIA 568A standard has been replaced by TIA/EIA 568B. However, both cable standards are still used. They are similar, but are not the same. Both standards use unshielded twisted pair cables.
The Crossover Cable
The crossover cable formation can be used without a hub or switch. It is used in a peer-to-peer connection. It is used when one needs to connect two Ethernet devices together without a hub or switch. It can also be used to connect two hubs to each other. The simplest way to achieve this is to use the 568 A at one end and the 568B at the other end of the RJ45 plug.
Color Coding Of The Wires
There are a total of eight wires inside the cable, twisted into four pairs. Each pair has a primary solid-colored wire and another one with a primary white with a colored stripe running through its center. The stripe in the pair is of the same color as the solid color. The pinout for the cable 568A going from position one (that is, the wire that is attached to pin 1 of the RJ45 plug) is white/green, green, white/orange, blue, blue/white, orange, white/brown, brown, and that for the 568 B is white/orange, orange, white/green, blue, white/blue, green, white/brown, and brown. The easiest way to remember how to wire a crossover cable is to switch the set of wires, that is, to switch the solid green and the solid orange and the white/green and the white/orange.
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What is the Ethernet Cable Pinout
Ethernet cable is used to connect an network interface card (NIC) with a hub or Ethernet switch. Ethernet cables can be readily purchased from a computer store. They come in two categories, flat and braided. The flat, or solid, cable is used when there is a need for a longer cable run. However, it is not flexible; thus, its position is fixed. The braided cable is easier to use and is more flexible. However, it is useful only in places where a shorter cable run is needed. In the Ethernet cable pinout there are basically two cables: (1) the straight cable and (2) the crossover cable. The cables are color-coded. It is very important to connect the cables properly because improperly connected cables can lead to loss of Internet connectivity. The straight cables can be used to make a crossover cable when needed.
What Is Required For An Ethernet Cable Pinout
• Category 5/5e or 6 braided or solid cable (decide according to usage)
• RJ45 ends
• A crimper
• A wire cutter
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What Is Required For An Ethernet Cable Pinout
• Category 5/5e or 6 braided or solid cable (decide according to usage)
• RJ45 ends
• A crimper
• A wire cutter
Posted by: Wasim Javed
Labels:
DSL
Ethernet Topologies
Ethernet 10Base-5 and 10Base-2 used a bus topology. Bus topologies were difficult to maintain and troubleshoot.
Modern Ethernet networks use a star topology with an Ethernet hub, switch, or router at the center of the star.
It is still possible to create a two-node Ethernet network in a bus topology using a null-Ethernet cable between the two devices.
Ethernet DTE and DCE
All nodes on an Ethernet network are either DTE (Data Terminal Equipment) or DCE (Data Communications Equipment).
Ethernet DTE are devices such as computers and printers which are trying to communicate on the Ethernet network.
Ethernet DCE are devices such as switches and routers which are trying to help other devices communicate on the Ethernet network.
Ethernet CSMA/CD
Like any network, Ethernet must have an algorithm for determining when each network node is allowed to communicate.
In Ethernet, this algorithm is known as CSMA/CD (Carrier Sense Multiple Access / Collision Detection).
CSMA/CD has proven to be a very capable, if highly anarchistic, algorithm.
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Modern Ethernet networks use a star topology with an Ethernet hub, switch, or router at the center of the star.
It is still possible to create a two-node Ethernet network in a bus topology using a null-Ethernet cable between the two devices.
Ethernet DTE and DCE
All nodes on an Ethernet network are either DTE (Data Terminal Equipment) or DCE (Data Communications Equipment).
Ethernet DTE are devices such as computers and printers which are trying to communicate on the Ethernet network.
Ethernet DCE are devices such as switches and routers which are trying to help other devices communicate on the Ethernet network.
Ethernet CSMA/CD
Like any network, Ethernet must have an algorithm for determining when each network node is allowed to communicate.
In Ethernet, this algorithm is known as CSMA/CD (Carrier Sense Multiple Access / Collision Detection).
CSMA/CD has proven to be a very capable, if highly anarchistic, algorithm.
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Labels:
DSL
What is Ethernet
Ethernet is the most common LAN (Local Area Network) technology in use today.
Ethernet was developed by Xerox in the 1970s, and became popular after Digital Equipment Corporation and Intel joined Xerox in developing the Ethernet standard in 1980.
Ethernet was officially accepted as IEEE standard 802.3 in 1985.
The original Xerox Ethernet operated at 3Mbps. Ethernet networks up to 10Gbps now exist.
Posted by: Wasim Javed
Ethernet was developed by Xerox in the 1970s, and became popular after Digital Equipment Corporation and Intel joined Xerox in developing the Ethernet standard in 1980.
Ethernet was officially accepted as IEEE standard 802.3 in 1985.
The original Xerox Ethernet operated at 3Mbps. Ethernet networks up to 10Gbps now exist.
Posted by: Wasim Javed
Labels:
DSL
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