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R&M PowerSafe

4PPoE optimized. IDC inside.

The choice. Power over Ethernet.

Power over Ethernet (PoE) is the technology of choice to provide interference-free data and power simultaneously. By becoming more and more powerful, PoE – and mainly it’s the newest version, 4PPoE – is able to provide up to 90W of power. This puts completely new demands on the data cabling supporting them. PowerSafe products and solutions from R&M guarantee a stable and reliable transmission.

The strategy: prepare for the future

To ensure reliable, long-term 4PPoE capabilities, the following 3 quality factors will have to be followed simultaneously.

Cable: Control bundle heating

To handle increased temperatures, cable installation conditions (cable type, bundle size, cable duct properties) must be considered and the Link length may have to be reduced.


Get our PoE Calculator for free

R&M provides the «PoE Calculator» as a planning tool to simulate the various effects involved. Get the Power over Ethernet Calculator for free now.

Power transmission generates heat

Depending on the wire diameter of the cable, the current of 4PPoE produces heat. The higher the transmitted power, the higher the generated heat.

Trapped heat increases the temperature

Depending on installation conditions (cable bundle size, environmental conditions), the generated heat dissipates differently, and the cable temperature increase.

Reduce high-temperature effects

To mitigate the effects of higher attenuation in a cable with high temperature, link length may have to be reduced.

Connectivity: Manage spark erosion

Un-mating a connection under load will create sparks, that can damage the contacts of the connectors. The higher the transmitted power the higher the destruction. Whether an RJ45 jack is affected depends on the mechanical construction.

Separate functional areas

With a proper design of the products, the damaged area on the contact is separated from the contact area at rest.

Ensure spark resistance

Testing according to IEC60512-99-002 will assure the highest level of resistance against the effects of spark erosion.

Termination: Low contact resistance

Even small increases of resistance in an unsuitable termination can destroy a connector due to overheating.


Thermal simulation of connection

FEM simulations show, that with 4PPoE a contact resistance of 100 mΩ can result in temperatures in excess of 135 °C.

Insulation Piercing Connection (IPC)

IPC is the most commonly used termination in patch cords. Good initial contact resistance will unduly increase over time.

Insulation Displacement Connection (IDC)

IDC is the high-quality termination technology, where the wire is fixed between spring-loaded contact arms.

IDC, the termination technology for 4PPoE

IDC is the termination technology, that will assure low contact resistance over the entire lifetime of the cabling. Ideally suited for 4PPoE.

PowerSafe: the quality seal for 4PPoE

R&M marks the products using IDC termination technology with the PowerSafe quality seal.

Patch cords using IDC termination

R&M is the only manufacturer of factory terminated patch cords with IDC technology. Only these cords can assure reliable, long term 4PPoE performance.

R&M explains PowerSafe