Right on, Arthur.

You most definitely CANNOT just plug this card into any slot. This card has six isolated music outputs that feed to each line card. In addition, there is a music input and "A" (filtered, or talk) battery/ground. ITT made a 259B or 359A card mount (one or two slots, respectively) that mounted within the spare space of a 501 or 512 KSU. The two slot one had screw terminals on the back of this mounting that allowed field connections to be made, while the single-slot one had a pre-wired tail that connected to the 66 blocks within the KSU's back plane.


Ed Vaughn, MBSWWYPBX