What’s the Impact of the new RP Categories for Power over Ethernet Cabling?

Power Ethernet (PoE) is hot. The technology is booming. New PoE-capable devices for LAN, industry and building automation come onto the market almost daily, which is why now in particular, it is even more important to pay attention to the right cabling and planning.

Otherwise, things could get dangerously hot.

The latest PoE generation delivers up to 90 Watt via all four twisted pairs of the data cable (4PPoE). This High-power PoE has considerable consequences for structured cabling.

Therefore, Reichle & De-Massari (R&M) as a driving force for the PoE technology wants to support planners, installers, and building owners to make the right decisions.

► First point: 4PPoE can heat cables. The greater the power transmitted; the more heat is generated. Users should keep a cool head and not plunge into PoE applications without first planning carefully.

The international standard-setting bodies have recognized how important the topic of PoE has now become. Therefore, the cabling installation standards (ISO/IEC 14763-2 and EN 50174- 2) have been expanded by the remote power supply categories RP1, RP2, and RP3.

They were introduced to ensure the long-term reliable operation of the building network even at higher currents coming with High-power PoE. These three new categories define what is necessary before installation and during operation to be able to operate cabling safely with PoE.

Our video explains the impact and requirements of the new PoE categories RP1 – RP3 for planning and operating generic cabling systems.

► How to deal with die new PoE categories?

Basically, here’s what it’s all about: The average allowed DC-current in any given cable bundle in the network installation is defined and determines the RP category (the higher, the more current allowed).

The standard stipulates that appropriate warning signs must be attached to RP1 and RP2 installations. Before another PoE device is connected, compliance with the maximum permissible current must always be checked. This is easy when it comes to planning an installation, but it is very time-consuming for the building operator.

With RP3, the cabling is already configured during the planning phase so that all cables can transfer the maximum PoE current at the same time. This makes the system very safe in terms of operation.

► What a PoE planner has to make sure.

The challenge for the planner now is to make sure that the attenuation budget for data transmission can always be adhered to with RP3 cabling and that the permissible temperature in the cable is not exceeded. This is achieved by adjusting the link lengths to suit the ambient conditions of the installation.

If you plan appropriately and choose suitable products, your cabling system will be able to withstand the higher requirements. One of the most important preventive measures is to plan shorter links for your LAN. The shorter the cable link, the less resistance, heating, and attenuation losses during data transmission.

► The PoE Calculator V3 from R&M helps you find the right parameters and solution for your PoE cabling project.

The R&M PoE Calculator is the only tool on the market to implement documentation in accordance with the new remote power categories. R&M uses this document to list the RP categories in the warranty certificate and present them to the customer as part of the R&Mfreenet cabling system.

► Benefit from R&M’s know-how in all dimensions of Power over Ethernet:
– Discover our special PoE page: https://bityl.co/ILgE
– Read our White Paper: https://bityl.co/ILgk
– Follow Bob Smith, a PoE hero: https://ytube.io/3dbd

► Our most important PoE blogs:
– The hot topic and the insulation displacement contact technology – https://bityl.co/ILgT
– The New Categories for Power over Ethernet – https://bityl.co/ILgX

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