BSP - Bell System Practices (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.

500-110-100 SW Add iA Mar59 - Transmission Zoning

paul-f@verizon.net (Paul F) — Sun, 22 Mar 2026 14:52:05 -0700

Southwest Bell Telephone Addendum. Authorizes the use of 5300-type telephone sets in Zone 2 if they are equipped with a G1 handle containing an F1 transmitter and a U1 receiver. Contributed by Paul Fassbender.

500-110-100 SW Add iB Apr68 - Transmission Zoning

paul-f@verizon.net (Paul F) — Sun, 22 Mar 2026 14:46:05 -0700

Southwest Bell Telephone addendum. Eliminates zones 2 and 5. Only zone L need be specified in the "TZ" (Transmission Zone) block on the service order, if applicable.

500-110-100 i3 Mar59 - Transmission Zoning

paul-f@verizon.net (Paul F) — Sun, 22 Mar 2026 14:38:40 -0700

Renumbered from C38.003 i3 Mar59. Contributed by Paul Fassbender.

500-110-100 i4 Feb64 - Transmission Zoning

paul-f@verizon.net (Paul F) — Sun, 22 Mar 2026 14:35:07 -0700

Eliminates zone 5-2. Updates the sets covered. 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.

937-217-130 i1 Jun 1954

r.h.enthoven@infc.info (Remco E) — Mon, 25 Aug 2025 10:15:30 -0700

Contributed by: Jonathan Glusband

Section AG17.130

Joined Use of Wood Poles

Agreement Forms for Use with Organizations Financed by the Rural Electrification Administration

937-217-126 i1 Sep 1972

r.h.enthoven@infc.info (Remco E) — Mon, 25 Aug 2025 10:14:27 -0700

Contributed by: Jonathan Glusband

Division of Cost Methods in Formulating Joint Use Agreements

937-217-125 i1 Jan 1954

r.h.enthoven@infc.info (Remco E) — Mon, 25 Aug 2025 10:13:32 -0700

Contributed by: Jonathan Glusband

Joined Use of Wood Poles

General Agreement with Power Companies

937-217-001 i3 Sep 1979

r.h.enthoven@infc.info (Remco E) — Mon, 25 Aug 2025 10:12:27 -0700

Contributed by: Jonathan Glusband

Coordination Activities with the Edison Electric Institute

501-163-100 i1 Dec61 - Station Dials 40-Type

paul-f@verizon.net (Paul F) — Fri, 23 May 2025 15:28:38 -0700

Used in the 661 keyset card dialer. Line powered and polarity-sensitive dial.
Replaced by the 41-type dials, which needed an external low voltage power supply. The 41-type was used in the 662 keyset card dialer and most later rotary card dialers.
Contributed by Paul Fassbender.

770-130-301 i2 Aug52 - Sweeping

paul-f@verizon.net (Paul F) — Tue, 20 May 2025 10:00:20 -0700

1.01 This section describes the procedure for sweeping with floor brushes to remove loose dirt and litter accumulated on floors, stairways, sidewalks, areaways, etc.

Also see "H-series Sweeping BSPs from 1952-59"

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.