Try watching GMN's short videos:
http://web.globalmarinenet.com/blog/...012-Conference
It's okay to sign in - they're good folks.
I'll be doing the same thing in a couple of days - I bought the Iridium AccessPoint too - so please let me know how it goes.
After watching Luis's videos, if you are still having problems I'd suspect the cable. Those mini-USB plugs (on the phone end) aren't that great. OTOH, if it's the older 9505A (phone) you're probably going to need a serial-to-USB dongle and the driver software for it. I have the newer 9555 now so my Keyspan Serial-to-USB dongle is up for grabs if you need it.