BPO WIRING DIAGRAMS
AND DRAWINGS
This page links to diagrams.  Drawings are linked from the page they refer to i.e. a telephone No. 706 drawing would be linked from the Telephone No. 706 page.  If a drawing is missing then it is not available on this site at this time, but can be requested.

With the two diagram web pages, just use the search facility in your web browser to locate the appropriate diagram.

DIAGRAM INFORMATION - Description of the diagram system including a list of all the BPO diagram prefix's
DIAGRAM SYMBOL INFORMATION - How to identify the symbols on the diagrams
DIAGRAM SPREADSHEET  - (Excel Spreadsheet format)
N DIAGRAMS - (Web page)
Q DIAGRAMS  - (Web page)

Here is a short list of the most requested diagram types:-
AT - AUTOMATIC TELEPHONE EXCHANGE EQUIPMENT
FA - WIRING DIAGRAMS (FIRE SYSTEMS)
N - DIAGRAMS (TELEPHONES & PBX)
PA - WIRING DIAGRAMS (POLICE SYSTEMS)
Q - DIAGRAMS LIST (HES AND ITS)
RP - REPEATER STATION EQUIPMENT
SA - WIRING DIAGRAMS (SUBSCRIBER APPARATUS)
T - WIRING DIAGRAMS (TESTING)
TG - WIRING DIAGRAMS (TELEGRAPHS)

 
 
BACK Home page BT/GPO Telephones Search the Site Glossary of Telecom Terminology Quick Find All Telephone Systems

Last revised: January 27, 2025

FM