#Bellcore standards manual portable
The BSP documents were produced in primarily two formats, 8 1/2"x11" pages for use in office environments, and in a small, portable format (4" x 6 7/8") for use by installers on the job, carried in their service trucks. The content could be general descriptive information, information on wiring and connections, test procedures, or piece-part replacement and repair information.
#Bellcore standards manual serial number
The final three digits indicate the serial number of the document. The next three digits indicated a specific subject area, such as the specific type of equipment used within the major division subject. The first three digits referred to the division, which indicated a broad subject area, such as subscriber sets or the No.
In the 1950s, the format of BSP designations was changed to a nine-digit numerical format, written in three groups of three digits. For example, the section designation C34.175 Issue 1 identified a document entitled Station Dials-2 and 4 Types-Maintenance. The version of each document was indicated by an issue number. The sections consisted of one letter and two digits, followed by a period character and a three-digit document number. Initially, BSPs were identified by mixed alphanumeric sequence numbers designating a section and a specific document number within each section. Issuance of Bell System Practices within the Bell System started in the late 1920s, when they replaced a similar compendium, the AT&T Handbook Specifications.
Collectors also use these documents to help date and restore vintage telephones. Updates cover manufacturing changes phased into production during a product's lifetime of interest to the installer, including changed product features, internal component parts, available colors and installation procedures. They enabled employees, who had never met previously, to easily work with one another in the event of a service outage, a disaster, or merely when relocating. With sections regularly updated, printed and distributed, the BSPs were the key to the standardized service quality throughout the Bell System. Covering everything from accounting and human resources procedures through complete technical descriptions of every product serviced by the Bell System, it includes a level of detail specific to the best way to wrap a wire around a screw, for example. The Bell System Practices ( BSPs) is a compilation of technical publications which describes the best methods of engineering, constructing, installing, and maintaining the telephone plant of the Bell System under direction of AT&T and Bell Telephone Laboratories. NPort 6450 Models: IEC 6 ESD: Contact: 4 kV Air: 8 kV IEC 6 RS: 80 MHz to 1 GHz: 3 V/m IEC 6 EFT: Power: 1 kV Signal: 0.5 kV IEC 6 Surge: Power: 1 kV IEC 6 CS: 150 kHz to 80 MHz: 3 V/m Signal: 3 V/m IEC 6 PFMF IEC 6 NPort 6600 Models (except -48V/-HV models): IEC 6 ESD: Contact: 4 kV Air: 8 kV IEC 6 RS: 80 MHz to 1 GHz: 3 V/m IEC 6 EFT: Power 1 kV Signal 0.5 kV IEC 6 Surge: Power: 2 kV IEC 6 CS: 150 kHz to 80 MHz: 3 V/m Signal: 3 V/m IEC 6 PFMF IEC 6 NPort 6600-48V Models: IEC 6 ESD: Contact: 4 kV Air: 8 kV IEC 6 RS: 80 MHz to 1 GHz: 3 V/m IEC 6 EFT: Power: 1 kV Signal: 0.A typical volume of Bell System Practices from the 1970s.
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