Contributed by John Novack.

30 pages. Technical Troubleshooting Aid - contains Bell System Repair Specification (BSRS) 255.73. Detailed component photos, block diagram, schematic and drawing references. Contributed by John Novack. Bookmarks by Paul Fassbender.

UNIX System User's Manual Release 5.0, published by Western Electric June 1982

Booklet Format - No OCR - Print dual sided, bind on short edge. Contributed, scanned and formatted by Steph Kerman. Processed by Paul Fassbender.

Contributed by Steve Cichorsky.  OCR by Clint Gilliland.  [Original was archived]

"Bone" Butt set. OCR by Paul Fassbender.

Contributed by John Novack.

How to use the Bell System branded automatic telephone answering machine made by ATC - American Telecommunications Corporation. See BSP 514-156-100. Contributed by David Kingston. OCR by Chuck Hensley.

PUB 47101, PRELIMINARY
Bell System Voice and Data Communications
TECHNICAL REFERENCE, Standard Plugs and Jacks

Director - Business Premises Engineering - Data and Special Systems
AT&T September 1979

PUB 47102,  Bell System TECHNICAL REFERENCE - Miniature Plugs and Jacks - December 1982, 326-143.

Contributed by Sam Etler. Bookmarked and processed by Paul Fassbender.

89 pages. Includes terminology which has been considered and approved by the Nomenclature Committee on Equipment Nomenclature.
The terms herein described are intended for use on all new and reissued material issued by the Bell Telephone Laboratories, Inc., and apply specifically to circuit drawing titles and notes, equipment drawing titles and notes, circuit descriptions, equipment explanations, J specifications, keysheets, etc. Contributed and scanned by John Novack. Bookmarked and processed by Paul Fassbender.

11MB.  July 1961, Illinois Bell, PBX 75. Photos of switchboard.

Contents (TOC)

How to Help Your Extension Users 1
Private Switchboard Services 3
To Private Switchboard Operators 5
Out of Town Calls 10
Description of the Switchboard 15
Method of Operation 16
- Incoming Calls 17
- Calls from Extensions 21
- Handling Established Connections 24
- Night Connections 26
- Conference Calls 26

Suggested Phrases
The Courteous Way...

Contributed by Steve Cichorsky.  OCR / Size reduction by Clint Gilliland.

36MB. July 1961, Illinois Bell, PBX 75. Photos of switchboard.  Contributed by Steve Cichorsky.

Switching Products Manual, Local Sytems 9/76

No.2, No.2B, No. 2C, No. 3 ESS

999-200-107, issue 2, October 1970.  Contributed by John Novack.

31 pages. November 1960. Pacific Telephone. OCR and bookmarks by Paul Fassbender.

999-200, issue 2, June 1969. Operating Instructions. See "Phone Service for Small Motels - The 761A PBX Switch and 543D Desk Set" in Singing Wires, September 2016. Contributed by Steve Cichorsky. OCR and bookmarks by Paul Fassbender.

ComKey. Contributed by Steve Cichorsky.

PA-6P014, COSMOS (COmputer System for Maintenance OperationS) Frame
Transaction Codes, Issue 3, 11/30/80, 78 pages