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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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Schematic diagram for the connector circuit in the No. 5 Crossbar MTC From the Connections Museum, Seattle
Topics: 5xb, 5 crossbar, trouble recorder
Bell System Drawings
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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 American Telephone & Telegraph Company
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Bell System Drawings
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This circuit provides a means of connecting a two-wire trunk incoming from a distant step-by-step office, to a three-wire rotary out-trunk switch having access to trunks to a distant dial office.
Topics: step, trunk
Bell System Drawings
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Circuit description for the No. 1 Crossbar Subscriber Sender Test frame
Topics: bell system, circuit description, crossbar, sender test frame
Bell System Drawings
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Drawing to go with CD 26030-01, which see.
Topics: bell system, 5xb, 26030
Bell System Drawings
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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
by Bell Telephone Laboratories Incorporated
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Bell System Drawings
by Bell Telephone Laboratories Incorporated
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Bell System Drawings
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SD-69076 Station Systems Key Equipment no. 101A, 101B, or 102A and Switching System no. 302, Line Circuit, or Ringdown Tie Line Circuit
Topics: 101a, 101b, 102a, 302
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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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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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 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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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
by Bell Telephone Laboratories Incorporated
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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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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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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
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This circuit is for use with the panel, step-by-step, manual or crossbar office end of a two-wire toll connecting trunk arranged for connection to a coin box subscribers line.
Topics: coin, step, panel, manual, crossbar
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
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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
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
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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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 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
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
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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
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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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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