RJ45 jumper box¶
This is a small circuit board that allows you to prototype arbitrary RJ45 cables / pin-outs. Once the pin-out is confirmed, you can go ahead and crimp a cable with matching pin-out, having verified that it is correct.
laforge finds this very useful, particularly in the context of the many different RS232 on RJ45 pin-outs in use by various equipment out there.
In the hardware version v2, the PCB design was switched to a two-layer design, and both RJ45 connectors are now located on the top side of the PCB. This significantly increases the usability.
This is a single-layer PCB design. In order to make the PCB routing easy, the RJ45 connectors are on opposite sides of the PCB.
The PCB design files are available at https://gitea.osmocom.org/electronics/osmo-small-hardware/src/branch/master/rj45-jumper-box
It's OSHW, so you can build it yourself based on our design files published above. If you prefer a fully assembled product, sysmocom is offering fully assembled kits in their webshop at https://shop.sysmocom.de/RJ45-Jumper-Box/rj45-rp-kit