Arthur, I am sorry if I offended you or any other members of this forum by seems to be being difficult to work with. I have never been a Bell or WE employee - I am a collector whose primary goal or dream was to have a working 1A2 system in my home. I hope you can understand my frustration that I have been working on collecting the parts I need for the 1A2 system for 5 years and had to pack everything up so the rest of the 25-pair cable could be run. Now I cannot find anything. I can't remember what I had for breakfast much less that I had a Viking ring booster installed. My current phone system was professionally installed so I don't know all the nuances of the system. I also believe you never answered me as to what kind of KSU I have put in service. I know it's not the 551B because it is marked. I know it is either a 551A or C. Once I identify it, I will look up the corresponding BSP.

Bill