HP 3000?? Thing-a-ma-jig available

[Jay West]

As part of another deal, I acquired a piece of HP gear I have no interest in 
(nor do I know for sure what it is).

It's an HP 30151A or "ATP Expansion Package". It appears to have 24 modems 
in it, or serial ports at the least (I haven't popped the cover).

Pictures of the unit are at:
http://www.ezwind.net/jwest/hp30151A

Can someone elicudate what this is and what it's designed to connect to? If 
it's nothing I can use... it's available for shipping costs.

Jay West