Industry’s First Fully Integrated Power Over Ethernet PD Interface Modules

May 26, 2006
Compact, IEEE802.3af-compliant modules with onboard isolated DC/DC converter eliminate need for localized power source in PoE applications
  • Fully integrated PoE Powered Device (PD) interfaces
  • Combine data isolation, PoE handshaking, DC/DC conversion and protection
  • Provide full IEEE802.3af-compliant data and power interface to Ethernet line
  • Range of output voltage options

C&D Technologies has launched a family of fully integrated Powered Device (PD) interface modules that will significantly reduce component count, design time and installation cost of Power over Ethernet (PoE) applications. The NMPD series of compact power extraction modules are the industry’s first PD interfaces to feature on-board DC/DC conversion, and provide a full IEEE802.3af-compliant data and power interface to an Ethernet line including short-circuit protection.

The NMPD modules are ideal for PoE designs in applications ranging from security equipment and public address systems to remote environmental monitoring, telemetry and industrial control. Operating with a maximum output power rating of 10W, the modules extract power from a CAT5 twisted pair Ethernet cable when sourced by IEEE802.3af-compliant power sourcing equipment (PSE).

Each module integrates data isolation transformers, PSE handshaking and signature control functionality, and a UL-approved DC/DC converter delivering an isolated DC output voltage. As a result, the need for external power sources and isolation transformers is eliminated. Typical signature resistance and signature capacitance is 25kO and 100nF respectively, while classification current is 4mA.

The new modules work with a nominal 48V input voltage and are available with isolated output voltage options of 3.3V, 5V, 12V and 15V. Isolation is rated at 1500VAC (for one minute). In accordance with the IEEE802.3af standard, NMPD PD interfaces draw power from the Ethernet data lines or spare pair wires.

All of the modules in the NMPD series incorporate an LED to indicate output voltage presence, while on-board thermal shutdown and overcurrent protection further reduces the need for external components. A module enters overcurrent mode when maximum output power is exceeded, and automatically recovers when the overload condition is removed.

NMPD modules are supplied in a compact, vertically mounted SIP form factor with dimensions of just 91.8mm x 25.1mm. The parts will operate at full load in ambient temperatures ranging from -40°C to 60°C.

Unit pricing for the C&D Technologies NMPD Series is less than $18 in OEM quantities.

About C&D Technologies
C&D Technologies, Inc. is a technology company that produces and markets systems for the conversion and storage of electrical power, including telecom/industrial batteries, rectifiers and electronics. Corporate headquarters are in Blue Bell, Pennsylvania, USA and the company is traded on the NYSE under the symbol ‘CHP’.

The Power Electronics Division of C&D Technologies, Inc. ( is headquartered in Mansfield, Massachusetts. The division designs, manufactures and distributes DC/DC Converters, AC/DC Power Supplies, Magnetics, Data Acquisition devices and Panel Meters, and offers these products in custom, standard and modified-standard variations. These products, which are built to exacting requirements in ISO9000:2000-approved facilities, are typically used worldwide within telecommunications, computing, industrial and other high-tech applications.