Bel Magnetic Introduces New MagJacks for Higher Power Ethernet

Responding to the increasing high-power requirements for Power-over-Ethernet (PoE) connectivity, Bel Magnetic Solutions has introduced two new models to its line of MagJack integrated connector modules. 

The products, a 4-port model and a 2-port, use two types of wire-wound magnetics, explained John Hess, product manager. “The first type is a toroidal common-mode choke. We wrap magnetic wire around the core to create inductance that at higher frequencies acts as an attenuator to common-mode noise that may be on the differential pair.” 

“The second is a toroidal 1:1 isolation transformer where we are creating 1500Vrms of isolation between a primary side and secondary side of the transformer while maintaining the proper impedance.  This transformer also has a center tap on the secondary side that we use in pairs to transmit or receive power over the data lines of an ethernet cable.” 

The units are designed for telecom and networking applications including new 5G requirements and large-screen video display units. They offer maximum power of 100W or 1A over standard Ethernet cable. Customers can implement 100W PoE to double the amount of power their products manage over existing applications, while operating at Gigabit Ethernet speeds. They provide the capability of transmitting or receiving 0 to 100W of power per port over all four pairs within the Ethernet cable while maintaining the bandwidth of the Gigabit Ethernet signal. 

The 4-port model can be used in either power source equipment or powered devices. The 2-port model is well suited for network Interface cards and products requiring smaller boxes. Both units are backward compatible to slower speeds and lower powers using industry standard footprints and pinouts. 

Bel Magnetic Solutions, part of the Bel group of companies, manufactures integrated connector modules, power transformers, power inductors and discrete components. The parent company, based in Jersey City, NJ, designs, manufactures and markets a broad array of products that power, protect and connect electronic circuits primarily used in the networking, telecommunications, computing, military, aerospace, transportation and broadcasting industries. For more info, see