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Bell System Drawings

Blueprints, documentation and plans related to the US Telephone System (Ma Bell, Bell Telephone).



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Bell System Drawings
by Bell Telephone Laboratories Incorporated
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Bell System Drawings
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Bell System Drawings
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The purpose of this circuit is to provide means for connecting any of 100 district junctors to any of 100 subscriber senders and to provide means for controlling the establishment of these connections one at a time.
Topics: bell system, circuit description, crossbar, subscriber sender link
Bell System Drawings
by Bell Telephone Laboratories Incorporated
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Bell System Drawings
by Bell Telephone Laboratories Incorporated
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Topics: panel switch, circuit description, bell system, telephone switching, AT&T
This circuit provides a direct connection between a CX signalling type B or SX signalling trunk and a toll incoming selector.
Topics: toll, step
Topics: panel switch, circuit description, bell system, telephone switching, AT&T
Bell System Drawings
by Bell Telephone Laboratories Incorporated
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Bell System Drawings
by Bell Telephone Laboratories, Incorporated
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Bell System drawing. Missing sheets F.
Topics: KS-16765, announcement
Bell System Drawings
by Bell Telephone Laboratories Incorporated
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Topics: panel switch, circuit description, bell system, telephone switching, AT&T
Topics: panel switch, circuit description, bell system, telephone switching, AT&T
Bell System Drawings
by Bell Telephone Laboratories
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SD-69195-01 Key Equipment no. 101A or 101B Telephone and Key Circuit
Topics: 101a, 101b, key
Bell System Drawings
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Topics: panel switch, circuit description, bell system, telephone switching, AT&T
Bell System Drawings
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Topics: panel switch, circuit description, bell system, telephone switching, AT&T
Bell System Drawings
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Topics: panel switch, circuit description, bell system, telephone switching, AT&T
Bell System Drawings
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Topics: panel switch, circuit description, bell system, telephone switching, AT&T
This circuit provides for (a) intercommunication between maintenance men in the switch room, (b) for clearing permanent signals due to the calling party holding the connector and (c) for one-way transmission tests of connectors.
Topics: step, test, trunk
Topics: panel switch, circuit description, bell system, telephone switching, AT&T
Bell System Drawings
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Topics: panel switch, circuit description, bell system, telephone switching, AT&T
Bell System Drawings
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Topics: panel switch, circuit description, bell system, telephone switching, AT&T
Bell System Drawings
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Topics: panel switch, circuit description, bell system, telephone switching, AT&T
Bell System Drawings
by Bell Telephone Laboratories Incorporated
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Bell System Drawings
by Bell Telephone Laboratories Incorporated
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Bell System Drawings
by Western Electric Co.
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Topics: panel switch, circuit description, bell system, telephone switching, AT&T
Bell System Drawings
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Bell System Drawings
by Bell Telephone Laboratories Incorporated
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Bell System Drawings
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Topics: panel switch, circuit description, bell system, telephone switching, AT&T
Bell System Drawings
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A bootstrap program is a method used to get a program 'foot' into the door of the memory. In other words, when a volitile store loses its memory due to a system outage or program bug, an I/O device containing a backup copy of the program will be read in usually through a hardware-software handshaking to reload memory. Bootstrap programs are the software end of this reload and range from an absolute reload of all memory to a sophisticated selective partial reload of only mutilated memory. The...
Topics: 3ess, bootstrap, cinit
Bell System Drawings
by Bell Telephone Laboratories Incorporated
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Bell System Drawings
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Topics: panel switch, circuit description, bell system, telephone switching, AT&T
Topics: panel switch, circuit description, bell system, telephone switching, AT&T
Bell System Drawings
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Bell System Drawings
by Bell Telephone Laboratories Incorporated
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Bell System Drawings
by Western Electric Co.
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Topics: panel switch, circuit description, bell system, telephone switching, AT&T
Bell System Drawings
by Bell Telephone Laboratories Incorporated
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Bell System Drawings
by Bell Telephone Laboratories Incorporated
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Topics: panel switch, circuit description, bell system, telephone switching, AT&T
Bell System Drawings
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Topics: panel switch, circuit description, bell system, telephone switching, AT&T
Bell System Drawings
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Topics: panel switch, circuit description, bell system, telephone switching, AT&T
Bell System Drawings
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Topics: panel switch, circuit description, bell system, telephone switching, AT&T
Bell System Drawings
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Topics: panel switch, circuit description, bell system, telephone switching, AT&T
Bell System Drawings
by Bell Telephone Laboratories Incorporated
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Bell System Drawings
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Topics: panel switch, circuit description, bell system, telephone switching, AT&T
Bell System Drawings
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Topics: panel switch, circuit description, bell system, telephone switching, AT&T
Topics: panel switch, circuit description, bell system, telephone switching, AT&T
Topics: panel switch, circuit description, bell system, telephone switching, AT&T
Bell System Drawings
by Bell Telephone Laboratories Incorporated
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Bell System Drawings
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Bell System Drawings
by Bell Telephone Laboratories Incorporated
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Bell System Drawings
by Bell Telephone Laboratories Incorporated
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Bell System Drawings
by Bell Telephone Laboratories Incorporated
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Bell System Drawings
by Bell Telephone Laboratories Incorporated
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Bell System Drawings
by Bell Telephone Laboratories Incorporated
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The Maintenance Data Transmitter (MDT) is a trouble data collection device for No. 5 crossbar offices using the Automatic Trouble Analysis (ATA) System. It is designed to collect the trouble data presently punched in trouble record cards and forward this information via data link to a central computer for analysis.
Topics: 5xb, maintenance
Bell System Drawings
by Bell Telephone Laboratories Incorporated
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Bell System Drawings
by American Telephone & Telegraph Co.
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PANEL SYSTEMS SUBSCRIBER SENDER CIRCUIT 3-1 3-2, OR 2 DIGIT NON COIN ARRANGED WHEN REQUIRED FOR FOUR CLASSES OF SERVICE  FOR USE WITH SENDER SELECTORS AND DECODER CIRCUITS  From the Connections Museum, Seattle WA.
Topics: bell system, circuit description, panel switch, subscriber's senders
Bell System Drawings
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Topics: panel switch, circuit description, bell system, telephone switching, AT&T
This circuit provides means by which the central processor, under direction of the stored program and acting through scanner and signal distributor circuits, can carry out the functions required in establishing a test path from a local test desk No. 14 or local test cabinet No. 3 to a customer line.
Topics: test equipment, trunk
Bell System Drawings
by Bell Telephone Laboratories Incorporated
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Bell System Drawings
by Bell Telephone Laboratories Incorporated
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Bell System Drawings
by American Telephone & Telegraph Company
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Bell System Drawings
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Topics: panel switch, circuit description, bell system, telephone switching, AT&T
Bell System Drawings
by Bell Telephone Laboratories Incorporated
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Bell System Drawings
by American Telephone & Telegraph Company
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Bell System Drawings
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Bell System Drawings
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Bell System Drawings
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