PoE Chips and Equipment Provide Latest Building Blocks for High-Power PoE

Feb 13, 2008 4:38 PM
by David Morrison, Editor-in-Chief, Power Electronics Technology

PoE Midspan Produces Up to 576 W

Phihong USA has introduced a high-power, 36-W-per-port PoE midspan. Designated the POE576U, this low-cost midspan provides full power of 576 W for 10/100/1000 Base–T networks and requires no power management. This Power-over-Ethernet device is ideal for powering VoIP phones, security systems, IP cameras and wireless access points.

Available in 8- or 16-port versions, this high-power PoE midspan is 17.25 in. by 8.98 in. by 1.75 in. Compatible with IEEE-802.3af devices, networks are avai1able with 10BASE-T, 100BASE-T, and 1000BASE-T data rates. An SNMP option is available.

The POE576U has safety and protection systems designed to meet the IEEE 802.3 standards, including detection, disconnect and overload control. Overtemperature protection allows the midspan to automatically shut down without being damaged and the outputs are equipped with short-circuit protection. Also, in case of overvoltage, the outputs will shut down without any permanent damage to the midspan.

The voltage range is 90 Vac to 264 Vac, with ac input frequency from 47 Hz to 63 Hz. Typical pricing for the POE576U starts at $395 each for the 8-port version.

Gigabit Plus External Power Supply
SL Power Electronics, has introduced a family of single-port power injectors for PoE, Gigabit-compatible applications (10/100/1000 MbPS data rates) with up to 32 W (model dependent). The Ault PW183 family, known as PoE Plus Gigabit, provides power to devices through RJ45 jacks and high-speed data transfer over a single Ethernet cable.

“Our goal with our Power over Ethernet line is a simple one – to provide a full-range of standard single port midspan solutions with a complete arsenal of options so our customers can tailor the PoE solution to meet their unique requirements and branding,” explained Greg Harris, vice president, Global Sales and Marketing, SL Power.

The Ault PW183 midspan single port family recognizes a signature before enabling full output power. It also protects against more than one power supply per cable, regardless of polarity. Of the four models in the family, two are compliant with the IEEE-802.3af detection, disconnect, overload and over voltage control function standard (PW183RB and PW183RD). A load diagnostic LED advises by color and/or by blinking whether the injector is active, on or there is an error (IEEE-802.3af compliant models) and Power ON LED for models that do not meet IEEE-802.3af specifications.

For the four models in the family, two are 30-W models compliant with the IEEE-802.3af detection, disconnect, overload and overvoltage control function (PW183RB and PW183RD). The PW183RD also is a PoE Plus model, non-Gigabit. The PW183RA is a 32-W model designed to power legacy equipment and the PW183RC is a 32-W PoE Plus solution that supports 10/100 MbPS data rates, non-Gigabit.


AC input range for the entire family is 100 Vac to 240 Vac and 47 Hz to 63 Hz. The Ault PW183 family features a desktop style and complies with EMI/RFI regulations, is CE compliant, and meets safety approvals for OEMs to support customers worldwide. SL Power also offers a service called, Personalized PoE. This service provides customers an array of options to customize the power injector to meet unique technical, marketing or branding needs.

The Ault PW183RB is available immediately for approximately $19 in quantities of 1000 (pricing is model dependent).

For information on previously introduced, high-power PoE controllers see, “PoE Chips Reach For Higher Power and New Features,” which appeared in the March 2007 issue of Power Electronics Technology.

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