pdf CD-65680-01 i12D - 507A, 507B PBX (cropped and OCRed) Popular
By Anonymous 1034 downloads
CD-65680-01I12.pdf
Issue 12D. PBX Systems No. 507A and 507B Station Line, Trunk, Connecting, Telephone, Ringing, Buzzer and 2-way Ringdown Tie Trunk Circuits arranged for use with manual or dial central offices.
This contains a concise operational description for outgoing calls and incoming calls.
Contributed by John Novack.
New User?
Read the articles under "Introduction" in the black menu bar above.
Recent Contributors
Thanks for new documents from Ed Palazzo, Bruce Patterson, Jon Kolger, Paul Ivester, Len Hicken, Paul Fassbender, Fred Haynes, Kurt Rudolph, Wade ("Kellogg KITT"), the Connections Museum, Rick Walsh, Jeff Lamb, Jeremy Walters, Mark Cuccia, Alan David, Harry Joseph, Charlie Terry, Karl Brose, Dennis Hock, Tim Griffin, Remco Enthoven, and Steve Cichorsky.
Please send a file to add your name to this list!
Who's online
We have 641 guests online