There is a CO by me that was built in 1977, and houses 3 exchanges. Long story short, would that CO have been most likely originally equipped with 1AESS switching equipment?
And another question, does anyone know or can possibly point me toward any kind of documentation of when the RBOC's started using Northern Telecom and Siemen's switches? The only thing I can figure is this was sometime after 1984. The CO I mentioned earlier currently has Siemen's DE4 EWSD equipment and I'm trying to figure a general timeline of when it was upgraded to that, sometime before about 1998 (the earliest I can remember playing with the phone as a child), the recordings, and overall characteristics of the line haven't changed since then.
I have so many questions right now that what I really need is to find an old timer engineer that worked on this stuff in the 70s-90s but I'm sure someone here has an idea.
Thanks guys!