BSP Categories by early Letter Code (by Doc #) - TCI Library

C43.151 i2 Jan60 - Auxiliary Signals ID

paul-f@verizon.net (Paul F) — Sun, 17 May 2026 14:38:22 -0700

KS-16301 and KS-8000 series - Bells, Horns and Chimes. Contributed by Jeremy Walters.

C30.002 i6 May55 - Transmission Zoning

paul-f@verizon.net (Paul F) — Sun, 22 Mar 2026 16:39:15 -0700

1.01 This section is reissued to provide the installer and repairman with information regarding the type of transmitter and receiver associated with the proper hand set, that should be used in each of the transmission zones. This section has been revised to incorporate information covering the transmission zoning of F4 and F5 hand sets equipped with T1 transmitter units and U1 receiver units.

Contributed by Paul Fassbender.

C38.003 i2 Jan58 - Transmission Zoning

paul-f@verizon.net (Paul F) — Fri, 20 Mar 2026 15:43:34 -0700

Contributed by Dennis Hock. OCR by Paul Fassbender.

C38.003 i3 Mar59 - Transmission Zoning

paul-f@verizon.net (Paul F) — Thu, 19 Mar 2026 14:59:23 -0700

Renumbered to 500-110-100 issue 3,March 1959. The Transmission Zoning chart shows a 300-type set literally getting a shot-in-the-arm when a battery is added.
Contributed by Paul Fassbender.

C38.003 i3 Mar59 - Transmission Zoning - black & white

paul-f@verizon.net (Paul F) — Thu, 19 Mar 2026 14:58:10 -0700

Contributed by Paul Fassbender.

AB22.066.1 i1 May52 - 500 Set Description

paul-f@verizon.net (Paul F) — Tue, 03 Mar 2026 12:50:52 -0800

May 1952. (Renumbered to 852-220-100 i1) 500 series design objectives, mechanical, electrical and transmission features, noise crosstalk and sidetone considerations in design and performance.

C71.553.00 i1 Feb60 - 1A 1B Code Calling Systems - Description and Use

paul-f@verizon.net (Paul F) — Sun, 04 Jan 2026 15:22:49 -0800

Contributed by Paul Fassbender.

C71.553.01 i1 Feb60 - 1A 1B Code Calling Systems - Maintenance

paul-f@verizon.net (Paul F) — Sun, 04 Jan 2026 15:16:39 -0800

Contributed by Paul Fassbender.

C71.553.02 i1 Feb60 - 1A 1B Code Calling Systems - Connections

paul-f@verizon.net (Paul F) — Sun, 04 Jan 2026 15:14:14 -0800

Contributed by Paul Fassbender.

H-series Sweeping BSPs from 1952-59

paul-f@verizon.net (Paul F) — Tue, 20 May 2025 09:35:16 -0700

BSPs containing detailed descriptions on how employees processed mundane tasks are often cited as examples of the Bell System's obsessive attention to detail. Here is an extract of BSPs covering Sweeping from the full 624 page "H-series Buildings BSP_Collection 1932-60" Includes photos!

H51.103 i2 Aug52 - Sweeping - General
H51.104.1 i5 Jan58 - Sweeping, Dustless Damp Cloth Method
H51.104.2 i2 Mar58 - Sweeping, Dustless Treated Cloth Method - Laundered Type
H51.104.3 i3 Nov59 - Sweeping, Dustless Treated Cloth Method - Disposable Type

Contributed by John Jones. Scanned and OCRed by John Novack. Extracted and bookmarked by Paul Fassbender.

Also see related BSPs in division 770.

WR C63.373 Addendum i1 Sep42 - Desk Stand Connections CB

paul-f@verizon.net (Paul F) — Mon, 12 May 2025 19:48:51 -0700

2 pages. Connecting a sidetone common battery desk stand to an anti-sidetone subscriber set for sidetone use in all classes of service and for anti-sidetone use on individual lines without extensions. (...while observing wartime restrictions.) Contributed by David Willingham. Processed by Karl Brose and Paul Fassbender.

Check other issues of C63.373 and addenda for other options.

C30.011 ADD iA, May54, NY Tel - Colored Station Sets

r.h.enthoven@infc.info (Remco E) — Sat, 06 Apr 2024 14:02:44 -0700

Updates C30.011 issue 6. New York Telephone, issue A. Contributed by Karl Brose

C38.670.2 Add iA Mar60 - Michigan Bell - 700-Series Inst

paul-f@verizon.net (Paul F) — Wed, 24 May 2023 19:31:23 -0700

Addendum by Michigan Bell including, among other things, installation of Princess sets 701B in manual exchanges without an apparatus blank. Contributed by Dennis Hock, and referenced in his January 2023 Singing Wires article.

A837.002 i1 Apr 1936 General Description 640-line and 1440-line no. 12 Switchboard

r.h.enthoven@infc.info (Remco E) — Wed, 08 Dec 2021 11:48:00 -0800

Contributed by: Remco Enthoven

From the collection of the JKL Museum of Telephony

A837.001 i1 Jun 1932 General Description No. 12 Switchboard

r.h.enthoven@infc.info (Remco E) — Wed, 08 Dec 2021 11:47:55 -0800

Contributed by: Remco Enthoven

From the collection of the JKL Museum of Telephony

AA355.020 i7 Dec64 - J58829 - 756A PBX

paul-f@verizon.net (Paul F) — Fri, 20 Aug 2021 16:03:53 -0700

20 pages. Manufacturing Codes. Equipment Design Requirements. Submitted by Ray Konrath Prepared by John Novack.

AA355.001 i3 Oct54 - J58819 755A PBX

paul-f@verizon.net (Paul F) — Fri, 20 Aug 2021 16:03:49 -0700

20 pages. Equipment Design Requirements. Submitted by Ray Konrath Prepared by John Novack.

C57.205 I1 Jan 1952, Mobile Telephone Service, Mobile Station Installation Methods

r.h.enthoven@infc.info (Remco E) — Sun, 25 Jul 2021 14:42:38 -0700

Contributed by Remco Enthoven

From the collection of the JKL Museum of Telephony

H-series "Buildings" BSP Collection 1932-60

paul-f@verizon.net (Paul F) — Tue, 30 Mar 2021 17:33:55 -0700

624 pages. Collection of H-series "BUILDINGS" BSPs from 1932-1960. Includes an alpha index plus several numeric checking lists. The 1945 list includes some WR- (Wartime) BSPs, which (unfortunately) are not in the collection. If you have some of these, please contribute copies. BSPs are bookmarked by number, so use the index docs -- as you would with a paper archive. Note that the collection contents do not match the index documents, so refer to the bookmarks for the actual contents. Contributed by John Jones. Scanned and OCRed by John Novack.

C41.106 i1 Sep45 - Magneto Stns - Leich

paul-f@verizon.net (Paul F) — Mon, 22 Mar 2021 19:16:32 -0700

Contributed by Steve Cichorsky. OCR by Jeff Lamb.