991 Division (8 Digits Series)

You are here: Home > Browse the Library > BSPs (Bell System) > by Division Number > 950 - 993 Division (8 Digits Series) > 991 Division (8 Digits Series)

Check out the TCI YouTube channel here. Please subscribe!

Check here for the 2024 Telephone Shows

Folder 991 Division (8 Digits Series)

Documents

pdf 991.006.01 I1-se Popular

Published on 03 December 2009 By Anonymous 1133 downloads

Download (pdf, 920 KB)

991.006.01_I1-se.pdf

PBX Systems - Range Chart - Trunk and Station Conductor Loop
Ranges for PBXs Connected To No. 1 Crossbar Central Offices Having
1300-Ohm Subscriber Conductor Loop - 400-Ohm Talking Battery Feed
Circuit - AC-DC or Superimposed Ringing (84-88V AC Component) - Office
Voltage of 48V (Floating), Issue 1, 1960-03-01

pdf 991.006.04 I1-se Popular

Published on 03 December 2009 By Anonymous 1144 downloads

Download (pdf, 716 KB)

991.006.04_I1-se.pdf

PBX Systems - Range Chart - Trunk and Station Conductor Loop
Ranges for PBXs Connected To Panel Central Offices Having 635-Ohm
Subscriber Conductor Loop - 50-Ohm Talking Battery Feed Circuit - AC-DC
or Superimposed Ringing (72, 80, or 84 Volts Minimum AC Component) -
Minimum Office Voltage of 21V (Floating), Issue 1, 1960-05-01

pdf 991.102.02-se Popular

Published on 24 November 2009 By Anonymous 1012 downloads

Download (pdf, 4.95 MB)

991.102.02-se.pdf

608A Private Branch Exchange - General Description, Issue 1,
Feb. 1960 (Caution: 5MB due to photos)

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!