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Archive for the ‘Power over Ethernet’ Category

Cisco: The Leader in PoE Technology

Friday, June 19th, 2009

Power over Ethernet (PoE) was developed by Cisco Systems, an industry leader in the field of technology and networking hardware. Also sometimes referred to as ‘inline power,’ PoE is the ability that a LAN switching infrastructure can provide power to an endpoint, or ‘Powered Device,’ by utilizing a copper Ethernet cable. Cisco first delivered the capability in 2000 to address the needs of emerging IP Telephony deployments. Because IP (Internet Protocol) Telephones need power to operate, their deployment is simplified by combining power and data transfer in a single cable.

Cisco then began using the technology in other applications– particularly to power devices in atmospheres or locations where there was limited or no local power access. Other companies quickly caught on, seeing the importance of such a discovery in the technology field and a standardization of PoE (802.3af) came about, allowing for a newly formed generation of network-attached devices like card scanners, video cameras, POS devices, and much more.

Cisco now offers a complete range of 802.3af-based Power over Ethernet support in all members of its Catalyst Intelligent Switch families with both 10/100 PoE LAN and 10/100/1000 connections, including Catalyst 6500– a 96-port 10/100 PoE module.

In addition, Cisco subsequently introduced 802.3af compliant PoE products that also support their pre-standard PoE implementation. These products are backwards compatible with the company’s existing end devices, including Wireless access points and IP Telephony products. The Cisco Catalyst Intelligent Switches reliably deliver Intelligent Power Management capabilities beyond the optional IEEE Power Classification feature. These Switches enable granular, optimized and scalable power delivery to provide more efficient power management, keeping Cisco’s reputation as the leader in Power over Ethernet Technology warranted.

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The History of PoE (Power over Ethernet)

Tuesday, June 16th, 2009

PoE, or Power over Ethernet, is a technology that describes a system to transfer both electrical power and data to remove devices using standard twisted-pair cable in an Ethernet network. In many circumstances, supplying power separately is infeasible, expensive, or just plain inconvenient, and a switch module that offers PoE enhances a network’s versatility and makes it more attractive to network administrators. A good comparison is POTS telephones. Like a network with PoE, POTS telephones are analog, but receiver data and power through the same cable. You may also hear PoE referred to as ‘inline power.’

Power over Ethernet is useful for powering embedded computers,wireless LAN access points,IP telephones, remote network switches, and network cameras as well as other I.T. hardware that needs power. PoE is typically implemented following the specification guidelines in IEEE std. 802.3af-2003.

Industry leader Cisco Systems is the father of original PoE equipment. Cisco was manufacturing components with inline power several years before an IEEE standard for delivering PoE came to be. With a capability of delivering up to 10 Watts per port, Cisco PoE forerunners ensured the amount of power to be delivered was negotiated between the endpoint and the Cisco switch. This was based on a power value added to the CDP, or Cisco proprietary Cisco Discovery Protocol. But CDP does even more. It’s responsible for communicating the Voice VLAN value from the Cisco switch to the Cisco IP Phone as well.

Now, you will find many products on the market that offer PoE. Cisco is still providing hardware on the cutting edge of this technology with products like PWR-C45-1300ACV and PWR-C45-4200ACV.

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What is ‘inline power?’

Friday, June 12th, 2009

What is inline power?

Inline power is another term for Power over Ethernet (PoE), a technology that describes a system to transfer both electrical power and data to remove devices using standard twisted-pair cable in an Ethernet network. In many circumstances, supplying power separately is infeasible, expensive, or just plain inconvenient, and a switch module that offers PoE enhances a network’s versatility and makes it more attractive to network administrators. A good comparison is POTS telephones. Like a network with PoE, POTS telephones are analog, but receiver data and power through the same cable.

Inline power is useful for powering embedded computers,wireless LAN access points,IP telephones, remote network switches, and network cameras as well as other I.T. hardware that needs power. PoE is typically implemented following the specification guidelines in IEEE std. 802.3af-2003.

A good example of the type of enhancement Power over Ethernet can provide, can be seen in WS-X4248-RJ45V by Cisco. The Cisco Systems’ WS-X4248-RJ45V is a 48-port switching module designed to deliver standards-based integrated power by expanding PoE. The Catalyst 4500 Poe offers greater mobility and flexibility to users with the support of all-new services, applications and devices. The Catalyst 4500 Series is IEEE 802.3af PoE compliant with the integration of this new line card as well as Cisco IOS Software Release 12.2(18)EW and CatOS Software Release 8.3(1)GLX. Combined, they meet the needs of commercial and enterprise customers. The WS-X4248-RJ45V is compatible with the following switches: Catalyst 4503 Switch, Catalyst 4506 Switch, Catalyst 4507R Switch, Catalyst 4510R Switch, Catalyst 4003 Switch, and Catalyst 4006 Switch.

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Understanding Power over Ethernet (PoE)

Tuesday, June 9th, 2009

What is PoE?

PoE is the commonly used acronym for Power over Ethernet, a technology that describes a system to transfer both electrical power and data to remove devices using standard twisted-pair cable in an Ethernet network. In many circumstances, supplying power separately is infeasible, expensive, or just plain inconvenient, and a switch module that offers PoE enhances a network’s versatility and makes it more attractive to network administrators. A good comparison is POTS telephones. Like a network with PoE, POTS telephones are analog, but receiver data and power through the same cable. You may also hear PoE referred to as ‘inline power.’

Power over Ethernet is useful for powering embedded computers,wireless LAN access points,IP telephones, remote network switches, and network cameras as well as other I.T. hardware that needs power. PoE is typically implemented following the specification guidelines in IEEE std. 802.3af-2003.

A good example of the type of enhancement Power over Ethernet can provide, can be seen in WS-X4248-RJ45V by Cisco. The Cisco Systems’ WS-X4248-RJ45V is a 48-port switching module designed to deliver standards-based integrated power by expanding PoE. The Catalyst 4500 Poe offers greater mobility and flexibility to users with the support of all-new services, applications and devices. The Catalyst 4500 Series is IEEE 802.3af PoE compliant with the integration of this new line card as well as Cisco IOS Software Release 12.2(18)EW and CatOS Software Release 8.3(1)GLX. Combined, they meet the needs of commercial and enterprise customers. The WS-X4248-RJ45V is compatible with the following switches: Catalyst 4503 Switch, Catalyst 4506 Switch, Catalyst 4507R Switch, Catalyst 4510R Switch, Catalyst 4003 Switch, and Catalyst 4006 Switch.

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