The Pi Zero and A+ both have what seems like space for an ethernet port on the bottom, in the section labeled J5:


Is this really an ethernet port, and if so, how would one connect to it (provide links to a jack that would fit)?

2 Answers 2


That's not an ethernet port, it's a JTAG port for debugging.

  • Are you sure? It doesn't look like JTAG.
    – Coder-256
    Commented Mar 2, 2016 at 19:45
  • Look at the signal names, TRST, TDI, TDO, TMS...
    – Gusman
    Commented Mar 2, 2016 at 19:46
  • @Gusman Well, shouldn't JTAG have 6 pins (including GND)?
    – Kachamenus
    Commented Mar 2, 2016 at 19:49
  • @Gusman Those are the JTAG signals. What about them?
    – Coder-256
    Commented Mar 2, 2016 at 19:51
  • 1
    Here is the full description on that port: sheffieldhardwarehackers.org.uk/wordpress/2015/12/…
    – Gusman
    Commented Mar 2, 2016 at 19:53

No it's not an ethernet port (and it doesn't look anything like one either).

It's the videocore JTAG port, that connector is used on all Pi models since the B+ (the original raspberry pi model A and B use a pin header instead). It is used by the engineers who developed the Pi for debugging.

Unfortunately it's not much use unless you have access to broadcom information and tools that are not available to the public.

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