Author Topic: Advice needed about wiring a 10 pin RJ45 port for ethernet pass-through  (Read 1953 times)

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Offline MarmottaTopic starter

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I'm building an PC-in-an-Xbox One system and was planning on reusing all the I/O from the console on a custom PCB where everything would pass through to the PC motherboard. Unfortunately, the ethernet port seems to be causing me more problems than I'd anticipated.

I'd foolishly believed that I could have just used the port as a passthrough, but it seems that there is continuity across all the though-hole pins, yet conversely I can't get any continuity from those pins to the connections on the port. I can't get any further information on the ethernet connector as it's a Foxconn part. I've included some pictures of the motherboard as well - pins 5 and 6 appear to be connected to GND via a capacitor and all the others seem to just go straight to the Realtek MDIO Ethernet controller on the motherboard.

      
 

Offline SeanB

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Re: Advice needed about wiring a 10 pin RJ45 port for ethernet pass-through
« Reply #1 on: January 13, 2020, 06:03:08 pm »
You have a ethernet port with integrated magnetics, done so they have the port and the required isolation transformer in a single part, saving board space and saving on assembly, plus the 2 port LED's are integrated into the top of the port next to the latch, making it compact.. Look up the part number, or look for other datasheets for similar parts and you will find information.
 

Offline wraper

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Re: Advice needed about wiring a 10 pin RJ45 port for ethernet pass-through
« Reply #2 on: January 13, 2020, 06:05:01 pm »
There are ports which are bare connectors with pins directly connected to wires. Other type has integrated transformers.
 

Offline pcmad

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Re: Advice needed about wiring a 10 pin RJ45 port for ethernet pass-through
« Reply #3 on: January 13, 2020, 11:01:03 pm »
rj45 connector are 8 wire max
 
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Offline Yansi

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Re: Advice needed about wiring a 10 pin RJ45 port for ethernet pass-through
« Reply #4 on: January 14, 2020, 12:11:59 am »
rj45 connector are 8 wire max

Sure, on the RJ45 side yes, but the two more pins on the PCB side are the center taps of the TX/RX transformers.
 

Offline pcmad

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Re: Advice needed about wiring a 10 pin RJ45 port for ethernet pass-through
« Reply #5 on: January 17, 2020, 04:32:41 pm »
rj45 connector are 8 wire max

Sure, on the RJ45 side yes, but the two more pins on the PCB side are the center taps of the TX/RX transformers.

or couldbe for the active led

Offline oPossum

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Re: Advice needed about wiring a 10 pin RJ45 port for ethernet pass-through
« Reply #6 on: January 17, 2020, 05:00:32 pm »
There are 10P10C modular connectors that are the same size as 8P8C ("RJ-45"). I'm not saying that is what is on the PCB in the first post, but they do exist and would have the same PCB footprint.
 

Offline Daixiwen

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Re: Advice needed about wiring a 10 pin RJ45 port for ethernet pass-through
« Reply #7 on: January 20, 2020, 11:22:59 am »
No Yansi is right on this one. There is no transformer on the PCB between the PHY and the connector, so you must use a connector with integrated magnetics. The two extra pins are for the center taps of the transformers.
 


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