pdf GTE Section 57 Part 505 - 555 PBX Switchboard Circuit Popular
1852 downloads
GTE_Sec57_Part_505_Sep59_555_PBX_SwitchboardCircuitDescription_Schematics.pdf
Sept 59. Describes the operation of various circuits of the 555 PBX switchboards. These include the cord, operator's telephone, dial, CO trunk and station line circuits. See Part 506 for maintenance info.
New User?
Read the articles under "Introduction" in the black menu bar above.
Recent Contributors
Thanks for new documents from Jim Hurtle, Ed Palazzo, Paul Fassbender, Bruce Patterson, Remco Enthoven, Jon Kolger, Paul Ivester, Len Hicken, Fred Haynes, Kurt Rudolph, Wade ("Kellogg KITT"), the Connections Museum, Rick Walsh, Jeff Lamb, Jeremy Walters, Alan David, Dennis Hock, and Tim Griffin.
Please send a file to add your name to this list!
Who's online
We have 1567 guests online