Searching for a 355A or AF adapter seems to be the same as searching for a Bacon Stretcher or a Left Handed Smoke Shifter
What I really need then is a DB25 to RJ45 kit and connect the pins to correspond.....?
Modular Adapter, DB25 Male to RJ45..and wire it as in this diagram.
DB25 to RJ45The admin port is serial, you need a 355A (or AF) adapter to get to RS-232.