I've looked through tons of online manuals and scoured the internet... what is included in this one BSP that it seems every copy had been removed? These units were stackable, they came in 8, 16, and 32 configurations I believe. If anyone remembers the wiring assignment I appreciate it. I have a 16 line module with the pwr supply.

A good example is one on ebay now: eBay item number: 401466969354 or search for "ATT WESTERN ELECTRIC TYPE 24B INDICATOR"

It looks like the power supply cable terminates in the connector. Thanks!