The admin port is serial, you need a 355A (or AF) adapter to get to RS-232. From there, you could use an Ethernet to Serial converter like this to put it on your network and administer your ACS.

Question is....why? Making changes is not real time, you pull the existing configuration into the GUI, make your changes with a multitude of mouse clicks, and then upload the file and reboot the phone system. Unless you are trying to make changes for a remote office, I can't see how that is easier or more efficient than just programming from Ext. 10 or 11 (and I've walked customers through programming entire systems from scratch over the phone in 30 minutes or so, simple changes take less than 2 minutes average)