CLICK HERE FOR THE LIST VIEW.]]> https://www.telephonecollectors.info/index.php/browse/document-repository/bsp-bell-system-practices-by-doc/bsp-categories-by-later-division-number-by-doc/950-993-division-8-digits-series?format=html Tue, 08 Apr 2025 16:31:26 -0700 en-GB hourly 1 https://www.telephonecollectors.info/index.php/browse/document-repository/bsp-bell-system-practices-by-doc/bsp-categories-by-later-division-number-by-doc/950-993-division-8-digits-series/14825-951-920-100-i1-sep63-touch-tone-calling?format=html 951-920-100 i1 Sep63 - Touch-Tone Calling 27 pages. Early description of touch-tone calling. Methods of partial conversion and complete conversion to use tone signals in existing mechanical exchanges. Contributed by the Connections Museum.

]]> https://www.telephonecollectors.info/index.php/browse/document-repository/bsp-bell-system-practices-by-doc/bsp-categories-by-later-division-number-by-doc/950-993-division-8-digits-series/14825-951-920-100-i1-sep63-touch-tone-calling?format=html 27 pages. Early description of touch-tone calling. Methods of partial conversion and complete conversion to use tone signals in existing mechanical exchanges. Contributed by the Connections Museum.

]]> paul-f@verizon.net (Paul F) 950 - 993 Division (8 Digits Series) Tue, 08 Apr 2025 16:31:26 -0700 https://www.telephonecollectors.info/index.php/browse/document-repository/bsp-bell-system-practices-by-doc/bsp-categories-by-later-division-number-by-doc/950-993-division-8-digits-series/981-division-8-digits-series/13637-981-680-100-i6-sep76-770a-pbx-general-descriptive-info?format=html 981-680-100 i6 Sep76 - 770A PBX - General Descriptive Info Contributed by Paul Wills. Processed by Paul Fassbender.

]]> https://www.telephonecollectors.info/index.php/browse/document-repository/bsp-bell-system-practices-by-doc/bsp-categories-by-later-division-number-by-doc/950-993-division-8-digits-series/981-division-8-digits-series/13637-981-680-100-i6-sep76-770a-pbx-general-descriptive-info?format=html Contributed by Paul Wills. Processed by Paul Fassbender.

]]> paul-f@verizon.net (Paul F) 981 Division (8 Digits Series) Mon, 02 Dec 2019 16:30:14 -0800 https://www.telephonecollectors.info/index.php/browse/document-repository/bsp-bell-system-practices-by-doc/bsp-categories-by-later-division-number-by-doc/950-993-division-8-digits-series/981-division-8-digits-series/13636-981-669-100-i2-oct68-761b-pbx-general-descriptive-info?format=html 981-669-100 i2 Oct68 - 761B PBX - General Descriptive Info See "Phone Service for Small Motels - The 761A PBX Switch and 543D Desk Set" in Singing Wires, September 2016. Contributed by Paul Wills. Processed by Paul Fassbender.

]]> https://www.telephonecollectors.info/index.php/browse/document-repository/bsp-bell-system-practices-by-doc/bsp-categories-by-later-division-number-by-doc/950-993-division-8-digits-series/981-division-8-digits-series/13636-981-669-100-i2-oct68-761b-pbx-general-descriptive-info?format=html See "Phone Service for Small Motels - The 761A PBX Switch and 543D Desk Set" in Singing Wires, September 2016. Contributed by Paul Wills. Processed by Paul Fassbender.

]]> paul-f@verizon.net (Paul F) 981 Division (8 Digits Series) Mon, 02 Dec 2019 16:30:12 -0800 https://www.telephonecollectors.info/index.php/browse/document-repository/bsp-bell-system-practices-by-doc/bsp-categories-by-later-division-number-by-doc/950-993-division-8-digits-series/981-division-8-digits-series/13635-981-270-100-i2-dec74-pbx-access-lines-autovon-general-desc?format=html 981-270-100 i2 Dec74 - PBX Access Lines - Autovon General Desc Contributed by Paul Wills. Processed by Paul Fassbender.

]]> https://www.telephonecollectors.info/index.php/browse/document-repository/bsp-bell-system-practices-by-doc/bsp-categories-by-later-division-number-by-doc/950-993-division-8-digits-series/981-division-8-digits-series/13635-981-270-100-i2-dec74-pbx-access-lines-autovon-general-desc?format=html Contributed by Paul Wills. Processed by Paul Fassbender.

]]> paul-f@verizon.net (Paul F) 981 Division (8 Digits Series) Mon, 02 Dec 2019 16:30:08 -0800 https://www.telephonecollectors.info/index.php/browse/document-repository/bsp-bell-system-practices-by-doc/bsp-categories-by-later-division-number-by-doc/950-993-division-8-digits-series/981-division-8-digits-series/10550-981-280-100-i1-apr60-ptt-add-a-153a-amplifier-for-head-tel-sets-gen-desc-info-ocr-r?format=html 981-280-100 I1 Apr60 PTT Add A 153A Amplifier For Head Tel Sets Gen Desc Info Ocr R Contributed by Steve Cichorsky.  OCR by Clint Gilliland.  [Original was archived]

]]> https://www.telephonecollectors.info/index.php/browse/document-repository/bsp-bell-system-practices-by-doc/bsp-categories-by-later-division-number-by-doc/950-993-division-8-digits-series/981-division-8-digits-series/10550-981-280-100-i1-apr60-ptt-add-a-153a-amplifier-for-head-tel-sets-gen-desc-info-ocr-r?format=html Contributed by Steve Cichorsky.  OCR by Clint Gilliland.  [Original was archived]

]]> (Anonymous) 981 Division (8 Digits Series) Sun, 11 Mar 2012 11:10:31 -0700 https://www.telephonecollectors.info/index.php/browse/document-repository/bsp-bell-system-practices-by-doc/bsp-categories-by-later-division-number-by-doc/950-993-division-8-digits-series/993-division-8-digits-series/3207-993-002-01-i1-no300switchsysstationsys-tl?format=html 993.002.01 I1-No300SwitchSysStationSys Tl https://www.telephonecollectors.info/index.php/browse/document-repository/bsp-bell-system-practices-by-doc/bsp-categories-by-later-division-number-by-doc/950-993-division-8-digits-series/993-division-8-digits-series/3207-993-002-01-i1-no300switchsysstationsys-tl?format=html (Anonymous) 993 Division (8 Digits Series) Wed, 22 Sep 2010 12:53:05 -0700 https://www.telephonecollectors.info/index.php/browse/document-repository/bsp-bell-system-practices-by-doc/bsp-categories-by-later-division-number-by-doc/950-993-division-8-digits-series/986-division-8-digits-series/3206-986-100-05-i1-a1digitaldatasignallingsystem-tl?format=html 986.100.05 I1-A1DigitalDataSignallingSystem Tl https://www.telephonecollectors.info/index.php/browse/document-repository/bsp-bell-system-practices-by-doc/bsp-categories-by-later-division-number-by-doc/950-993-division-8-digits-series/986-division-8-digits-series/3206-986-100-05-i1-a1digitaldatasignallingsystem-tl?format=html (Anonymous) 986 Division (8 Digits Series) Wed, 22 Sep 2010 12:49:01 -0700 https://www.telephonecollectors.info/index.php/browse/document-repository/bsp-bell-system-practices-by-doc/bsp-categories-by-later-division-number-by-doc/950-993-division-8-digits-series/993-division-8-digits-series/559-993-201-02-i1?format=html 993.201.02 I1 https://www.telephonecollectors.info/index.php/browse/document-repository/bsp-bell-system-practices-by-doc/bsp-categories-by-later-division-number-by-doc/950-993-division-8-digits-series/993-division-8-digits-series/559-993-201-02-i1?format=html (Anonymous) 993 Division (8 Digits Series) Wed, 09 Dec 2009 18:58:51 -0800 https://www.telephonecollectors.info/index.php/browse/document-repository/bsp-bell-system-practices-by-doc/bsp-categories-by-later-division-number-by-doc/950-993-division-8-digits-series/993-division-8-digits-series/506-993-003-01-i1-se?format=html 993.003.01 I1-se No. 153A Amplifier For Use With Head Telephone Sets, Issue
1, 1959-03-01

]]> https://www.telephonecollectors.info/index.php/browse/document-repository/bsp-bell-system-practices-by-doc/bsp-categories-by-later-division-number-by-doc/950-993-division-8-digits-series/993-division-8-digits-series/506-993-003-01-i1-se?format=html No. 153A Amplifier For Use With Head Telephone Sets, Issue
1, 1959-03-01

]]> (Anonymous) 993 Division (8 Digits Series) Thu, 03 Dec 2009 08:25:52 -0800 https://www.telephonecollectors.info/index.php/browse/document-repository/bsp-bell-system-practices-by-doc/bsp-categories-by-later-division-number-by-doc/950-993-division-8-digits-series/993-division-8-digits-series/507-993-201-01-i1-se?format=html 993.201.01 I1-se Emergency Reporting System - 520-Type PBX - Direct Line
Systems, Issue 1, 1958-06-01

]]> https://www.telephonecollectors.info/index.php/browse/document-repository/bsp-bell-system-practices-by-doc/bsp-categories-by-later-division-number-by-doc/950-993-division-8-digits-series/993-division-8-digits-series/507-993-201-01-i1-se?format=html Emergency Reporting System - 520-Type PBX - Direct Line
Systems, Issue 1, 1958-06-01

]]> (Anonymous) 993 Division (8 Digits Series) Thu, 03 Dec 2009 08:25:52 -0800 https://www.telephonecollectors.info/index.php/browse/document-repository/bsp-bell-system-practices-by-doc/bsp-categories-by-later-division-number-by-doc/950-993-division-8-digits-series/991-division-8-digits-series/504-991-006-01-i1-se?format=html 991.006.01 I1-se 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

]]> https://www.telephonecollectors.info/index.php/browse/document-repository/bsp-bell-system-practices-by-doc/bsp-categories-by-later-division-number-by-doc/950-993-division-8-digits-series/991-division-8-digits-series/504-991-006-01-i1-se?format=html 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

]]> (Anonymous) 991 Division (8 Digits Series) Thu, 03 Dec 2009 08:25:52 -0800 https://www.telephonecollectors.info/index.php/browse/document-repository/bsp-bell-system-practices-by-doc/bsp-categories-by-later-division-number-by-doc/950-993-division-8-digits-series/991-division-8-digits-series/505-991-006-04-i1-se?format=html 991.006.04 I1-se 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

]]> https://www.telephonecollectors.info/index.php/browse/document-repository/bsp-bell-system-practices-by-doc/bsp-categories-by-later-division-number-by-doc/950-993-division-8-digits-series/991-division-8-digits-series/505-991-006-04-i1-se?format=html 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

]]> (Anonymous) 991 Division (8 Digits Series) Thu, 03 Dec 2009 08:25:52 -0800 https://www.telephonecollectors.info/index.php/browse/document-repository/bsp-bell-system-practices-by-doc/bsp-categories-by-later-division-number-by-doc/950-993-division-8-digits-series/950-division-8-digits-series/503-950-703-01-i1-se?format=html 950.703.01 i1 Sep57 - Schematic Symbols for Attached-Contact Drawings Schematic Symbols for Attached-Contact Drawings, Issue 1, 1957-09-01. Info previously in AA602.016, A804.002 and B804.002. Later issues were renumbered to 005-108-111.

]]> https://www.telephonecollectors.info/index.php/browse/document-repository/bsp-bell-system-practices-by-doc/bsp-categories-by-later-division-number-by-doc/950-993-division-8-digits-series/950-division-8-digits-series/503-950-703-01-i1-se?format=html Schematic Symbols for Attached-Contact Drawings, Issue 1, 1957-09-01. Info previously in AA602.016, A804.002 and B804.002. Later issues were renumbered to 005-108-111.

]]> (Anonymous) 950 Division (8 Digits Series) Thu, 03 Dec 2009 08:25:52 -0800 https://www.telephonecollectors.info/index.php/browse/document-repository/bsp-bell-system-practices-by-doc/bsp-categories-by-later-division-number-by-doc/950-993-division-8-digits-series/993-division-8-digits-series/467-993-301-01-se?format=html 993.301.01-se SC2 Selective Control System, Issue 1, Aug. 1957

]]> https://www.telephonecollectors.info/index.php/browse/document-repository/bsp-bell-system-practices-by-doc/bsp-categories-by-later-division-number-by-doc/950-993-division-8-digits-series/993-division-8-digits-series/467-993-301-01-se?format=html SC2 Selective Control System, Issue 1, Aug. 1957

]]> (Anonymous) 993 Division (8 Digits Series) Tue, 24 Nov 2009 09:12:08 -0800 https://www.telephonecollectors.info/index.php/browse/document-repository/bsp-bell-system-practices-by-doc/bsp-categories-by-later-division-number-by-doc/950-993-division-8-digits-series/993-division-8-digits-series/468-993-402-01-se?format=html 993.402.01-se Common User Group Equipment - Air-Ground Voice
Communications System - Private Service Systems, Issue 1, Feb. 1958
(Not entirely clear from the title unless you're familiar with it, this
describes the SAGE air-ground voice communications system.)

]]> https://www.telephonecollectors.info/index.php/browse/document-repository/bsp-bell-system-practices-by-doc/bsp-categories-by-later-division-number-by-doc/950-993-division-8-digits-series/993-division-8-digits-series/468-993-402-01-se?format=html Common User Group Equipment - Air-Ground Voice
Communications System - Private Service Systems, Issue 1, Feb. 1958
(Not entirely clear from the title unless you're familiar with it, this
describes the SAGE air-ground voice communications system.)

]]> (Anonymous) 993 Division (8 Digits Series) Tue, 24 Nov 2009 09:12:08 -0800 https://www.telephonecollectors.info/index.php/browse/document-repository/bsp-bell-system-practices-by-doc/bsp-categories-by-later-division-number-by-doc/950-993-division-8-digits-series/993-division-8-digits-series/469-993-409-01-se?format=html 993.409.01-se General Description of SS1 Selective Signaling Systems, Issue
1, Oct. 15, 1959
(This one is interesting. It eventually became 982-325-100 but this
version is done on a typewriter with very neat but clearly hand drawn
schematics.? Guess they wanted to get the BSP out there quickly?)

]]> https://www.telephonecollectors.info/index.php/browse/document-repository/bsp-bell-system-practices-by-doc/bsp-categories-by-later-division-number-by-doc/950-993-division-8-digits-series/993-division-8-digits-series/469-993-409-01-se?format=html General Description of SS1 Selective Signaling Systems, Issue
1, Oct. 15, 1959
(This one is interesting. It eventually became 982-325-100 but this
version is done on a typewriter with very neat but clearly hand drawn
schematics.? Guess they wanted to get the BSP out there quickly?)

]]> (Anonymous) 993 Division (8 Digits Series) Tue, 24 Nov 2009 09:12:08 -0800 https://www.telephonecollectors.info/index.php/browse/document-repository/bsp-bell-system-practices-by-doc/bsp-categories-by-later-division-number-by-doc/950-993-division-8-digits-series/991-division-8-digits-series/466-991-102-02-se?format=html 991.102.02-se 608A Private Branch Exchange - General Description, Issue 1,
Feb. 1960 (Caution: 5MB due to photos)

]]> https://www.telephonecollectors.info/index.php/browse/document-repository/bsp-bell-system-practices-by-doc/bsp-categories-by-later-division-number-by-doc/950-993-division-8-digits-series/991-division-8-digits-series/466-991-102-02-se?format=html 608A Private Branch Exchange - General Description, Issue 1,
Feb. 1960 (Caution: 5MB due to photos)

]]> (Anonymous) 991 Division (8 Digits Series) Tue, 24 Nov 2009 09:12:08 -0800 https://www.telephonecollectors.info/index.php/browse/document-repository/bsp-bell-system-practices-by-doc/bsp-categories-by-later-division-number-by-doc/950-993-division-8-digits-series/971-division-8-digits-series/351-971-501-01-se?format=html 971.501.01-se Iss 3 - No. 5 Crossbar System

]]> https://www.telephonecollectors.info/index.php/browse/document-repository/bsp-bell-system-practices-by-doc/bsp-categories-by-later-division-number-by-doc/950-993-division-8-digits-series/971-division-8-digits-series/351-971-501-01-se?format=html Iss 3 - No. 5 Crossbar System

]]> (Anonymous) 971 Division (8 Digits Series) Sun, 15 Nov 2009 20:52:50 -0800