PoE power supplies feature integral DC injector

A Gresham Power Electronics product story

Edited by the Electronicstalk editorial team Aug 5, 2010

Gresham Power Electronics has introduced a flexible range of Power-over-Ethernet (PoE) power supplies with an integral DC injector.

Power-over-Ethernet provides a means to safely pass electrical power alongside data on Ethernet cabling.

Power can come from a power supply within a PoE-enabled networking device or from a device built for 'injecting' power onto the Ethernet cabling, such as a Gresham Power-over-Ethernet power supply.

Gresham's PoE power supplies provide 1A of either 48V or 55V DC output power as utilised by 10/100 Base-T transformers for connection to an IEEE 802.3 (10/100 Base-T) compatible device.

An output RJ45 connector provides the 10/100 Base-T data and DC output voltage for connection to network peripherals.

Three models of PoE power supplies are available from Gresham Power.

Two universal AC input (90-264V AC, 47-63Hz) models are available, one for indoor use and the other for outdoor use (when installed in a suitable environmental enclosure).

These two high-efficiency devices have an output current of 1A at either 48V or 55V DC.

With free air convection cooling the PoE adapters are very compact, measuring 160 x 63 x 32mm, and have full output protection including over-current, short-circuit and over-voltage protection.

They meet FCC 15 and EN55022 class B requirements and are CE, UL and CSA/CCC approved.

These power supplies have LED indicators for power and data 'good', feature an impact resistant polycarbonate enclosure with a three-prong IEC-320 C14 power inlet and have the option of being wall mounted.

The model 0334B5555 is for indoor use and has an operating temperature range of -5C to +45C.

The 0525B5555 model is an outdoor unit with an operating temperature range of -40C to +70C and is capable of providing a 70W output if used indoors.

The third Gresham PoE unit is also for outdoor use and has a DC input of 10.5 to 32V DC via a captive input cable.

It is convection cooled and has an operating temperature range of -40C to 70C at full load.

All other specifications and approvals are the same as the AC input versions.