As the standard 8P8C modular connector (commonly, but erroneously, known as RJ45) isn't the most robust of connectors, the flexible cables designed for portable use usually have Ethercon on the ends instead (much more robust connector). If you want a pre-made cable, you can buy cables with Ethercon ends and remove the outer shell to reveal a standard 8P8C connector (that may not have a locking tab). Alternatively, you can buy the bulk cable (Markertek has a few different brands of it) and put 8P8C ends on yourself - it's not difficult, and the crimp tooling isn't expensive.
And if this is for touring use, I'd also look into making adapters from the bare 8P8C connectors to Ethercon that live with the P16 units, allowing use of the more robust connector for daily use.