I have had a further response from Befaco that:
You have three pins on this connector: 1,2 and 3 - Its a 3 pins so it can be used for whenever you need to conect the poser supply... bus to power supply, PS to case, case to case etc
The connector can be to connect one case to the other, so you can use only one power supply for both.
So you use one pin for each power rail (there are three power rails +12 , -12 , GND)
Now... imagine you want to power two case and only one have the power supply inside. you can use a couple of this three pole connectors (one on each case) to send the power supply from the case number 1 with power supply to the case number 2 without power supply
Of course you also have to make a cable to go from one to the other....
Alas, this has left me even more confused. TO clarify and restate my original problem:
I have two power supplies and two cases (in different locations)
I would like to use the second power supply (an external 15v Cincon-TTA laptop-style universal power supply) to power the Befaco regulated power bus (https://www.befaco.org/en/fuente-alimentacion/) in the second case.
I would like to use something like the TipTop Zeus Access (http://www.tiptopaudio.com/manuals/TiptopAudiozeusxs.pdf) (with modification) to plug the 15v Cincon-TTA laptop-style universal power supply into