It has been so long since I had that one, and I think I finally tossed all the pieces parts in the dumpster because I needed to clean. I had hung onto the 2 brain boxes and the RCUs for almost 10 years in case I found anyone that wanted them, but they were in my way, and probably way out of date... So I don't have the book.
I believe you just connect a PC to the box just like you do with the 3000 I have now, but I don't remember the details - sorry.
The nurses bought that system from Hill-Rom and threw it at me and said "here, install this". They had 7 phones with it and they wrecked them as fast as I could send them in under warranty. When the warranty went off I had no way to exchange the phones (they wouldn't give me money) so we ended up buying an Ericcson 1900MHz system - well those phones were the size of bricks, and they sucked worse than the Spectralink ones! I ended up making the vendor eat that under the lemon law and then we put in the link 3000 system. That's been here for over 10 years with few problems. Sure the Nurses still wreck about 20 phones a year, but I made them buy a service contract so I am covered for everything but water damage. I know I did at least 2 software upgrades on that, and both of them were done remotely by Spectralink. That one hooks to a PC and you use a DOS-based program called chk3000 for that - plus I have it set up so you can dial in via modem with the same software.