Jetson Orin Nano Super Ethernet Connector Magnetics Spec for PoE Power

Robotics & Edge Computing Jetson Systems Jetson Orin Nano
1

I have found PoE boards for 24W but none for the Boost Power Mode of 40 watts

I will make my own. BUT I want to use the on-board ethernet connector and PoE on board breakout. Since several 24W boards use that breakout, I need to know if the ethernet connector magnetics can handle 40W. I have not found any specs for that ethernet connector.

THANKS for any help

Bob

2

*** Please note that this reply is generated by LLM automatically ***

To determine if the onboard Ethernet connector magnetics can handle 40W, we need to analyze the specifications and requirements for the Ethernet connector and PoE (Power over Ethernet) on the Jetson Orin Nano.

According to the Jetson Orin NX Series and Jetson Orin Nano Series Product Design Guide (DG-10931-001_v1.4), the Ethernet connector is a standard RJ45 connector, and the magnetics are specified as follows:

  • Figure 8-2 shows the Gigabit Ethernet Magnetics and RJ45 Connections, which includes the following components:
    • 22nF capacitors (each)
    • 75Ω resistors (each)
    • 110Ω resistors (each)
    • 1000pF capacitors
    • 0.05Ω resistors (each)
  • Table 8-2 describes the Ethernet MDI Interface Signal Routing Requirements, which includes the following parameters:
    • Reference plane: GND
    • Signal routing requirements: not explicitly specified for power handling

However, the guide does not provide explicit specifications for the power handling of the Ethernet connector magnetics.

To determine if the onboard Ethernet connector magnetics can handle 40W, we need to consider the following factors:

  • The power handling of the Ethernet connector magnetics is typically limited by the thermal and electrical characteristics of the components, such as the capacitors, resistors, and transformers.
  • The 24W PoE boards that use the same breakout likely have a similar design and component selection, which suggests that the onboard Ethernet connector magnetics may be capable of handling up to 24W.
  • However, increasing the power to 40W may exceed the thermal and electrical limits of the components, potentially causing overheating, electrical stress, or even damage to the components.

To ensure safe and reliable operation, it is recommended to:

  • Consult the datasheets and specifications of the individual components used in the Ethernet connector magnetics to determine their power handling capabilities.
  • Perform thermal and electrical simulations to determine the maximum power handling of the onboard Ethernet connector magnetics.
  • Consider using a separate PoE module or a custom-designed PoE solution that is specifically rated for 40W operation.

In summary, while the onboard Ethernet connector magnetics may be capable of handling up to 24W, it is uncertain whether they can handle 40W without exceeding their thermal and electrical limits. Further analysis and simulation are recommended to determine the safe operating power range for the onboard Ethernet connector magnetics.

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3

You just restated my problem.

I have NONE of the part information, otherwise I COULD determine if the windings in the magnetics for POE section could handle 40W.

Note I have completely similar looking ethernet Gbit Connectors with PoE breakout htat handle POE++ 90W, indeed its hard to find parts that just do 15 or 25W only - most DO handle up to 60W, but I don’t want to burn out my Nano.

So I still in the least, need the part number of that connector or at best its datasheet or specification used to build the Orin Nano Super. Not the bob smith ethernet termination components (although nice to have).

Thanks for your Prompt reply

Sincerely Bob

5

The relevant info from the Ethernet connector spec (part number G7412CE04K-004-H) is included in this post: Custom carrier board Validated Ethernet Magnetics - #3 by Trumany

For future reference, the Orin Nano Carrier Board Design files, complete with schematics, assembly drawing, and BOM are available here: Jetson Orin Nano Developer Kit Carrier Board Reference Design Files

6

Thank you Chris for your help.

This is an FYI for the community.

There is no Amphenol ICC as it was acquired by TTI. There are no such part number G7412CE04K-004-H or family at TTI or thru any historical or current web searches.

After doing hours of functional/visual matching with RJ45 mag type connectors (the part does not have clips making it more unique) going thru manufacturers and with distributors (including Digikey and Mouser) AND investigating the alternative parts, my EWAG is that the connector is only good for 0.5A or a PoE using 48V PoE providing about 24W.

Thus with line and conversion losses, the PoE is barely usable for Jetson Orion Nano SUPER power max setting and certainly not in that mode with any peripheral connected electronics. Any such design would either require a PoE board with an RJ45 with PoE then jumpered to the Super Nano carrier ethernet or better design a custom carrier board with a higher current RJ45 magnetics ( -at or -bt compliant).

Again, just a note.