New enhanced PoE standard lacks punch

The latest draft of a new standard for enhanced Power over Ethernet (PoE) has proposed significant changes to the amount of power that could be delivered, disappointing some pundits.

Draft 2.1 of the Institute of Electrical and Electronics Engineers (IEEE) 802.3at enhanced Power over Ethernet (PoE) standard (also known as PoE plus) caps the maximum current that could be delivered to a device at 600mA.

The current available to devices requiring PoE means that only 24.6W per port (30W theoretical), will be available for systems compliant with the new standard.

That represents a step up from the power available under the current IEEE 802.3af standard, and could prove attractive for uses wishing to connect " multi-radio access points, pan tilt zoom security cameras, and IP phones with streaming video displays," said PoE provider Phihong's marketing VP Keith Hopwood.

Hopwood pointed to other emerging applications which could also benefit from the new standard, as emergency lighting, security system sensors, biometric sensors, RFID and even medical monitoring.

However, he added that even before 'PoE plus' hits the shelves, Phihong has customers who need much more than 30W per port available through any ratified 802.3at standard.

Devices such as computer workstations and LCD display panels are far more power hungry, he noted. Phihong offers its own Ultra PoE products, which it claims can deliver 80W per port or higher, with the same protection and safeguards as standard PoE

See also:

Cisco goes it alone on 802.11n PoE

Network giant enhances IEEE 802.3at standard for devices requiring extra power  07 Feb 2008

New 802.11n AP works with legacy PoE

Siemens is offering firms a route to 802.11n that does not involve a costly PoE upgrade  30 Jan 2008

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