For an AI-net HU, you need this to convert the AI-net port to RCA jacks, and then one of those cables that converts RCA to mini-jack. You plug the AI-net cable into you HU, and then plug the other cable's RCA jacks into the AI-net cable. Then you would plug the mini-jack into your Ipod.

If your Alpine was M-BUS compatible, which it isn't, then you could use this adaptor to convert your cd changer port directly into a mini-jack plug.