My company just inherited a PBX from the company that used to occupy the space we're about to move in. We were preparing to purchase a new system but are now wondering if the system that was left behind is worth anything. The system has a large cabinet labeled "Infinite Basic KSU IN9000-00" in addition the cabinet contains cards labeled:

PS10A (2 of them)
DTIB (4 of them)
SLIB (1 of them)
LCOB (1 of them)
DIDB (1 of them)
T1IB (1 of them)
MPBI (1 of them)
MISU (1 of them)

50 handsets were also left behind. Assuming the system works is it something that shouldn't be too hard to connect to a bunch of analog lines?

Thank for any information you can provide.

--Louis