US1571513A - Telephone substation circuits - Google Patents

Telephone substation circuits Download PDF

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Publication number
US1571513A
US1571513A US682529A US68252923A US1571513A US 1571513 A US1571513 A US 1571513A US 682529 A US682529 A US 682529A US 68252923 A US68252923 A US 68252923A US 1571513 A US1571513 A US 1571513A
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United States
Prior art keywords
condenser
telephone substation
circuit
substation circuits
contact
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Expired - Lifetime
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US682529A
Inventor
William H Edwards
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AT&T Corp
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American Telephone and Telegraph Co Inc
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Application filed by American Telephone and Telegraph Co Inc filed Critical American Telephone and Telegraph Co Inc
Priority to US682529A priority Critical patent/US1571513A/en
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Publication of US1571513A publication Critical patent/US1571513A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/24—Arrangements for testing

Definitions

  • This invention relates to telephone sub station sets, and more particularly to cableincns testing sets which are suitable for use in machine switching central oliice districts
  • the principal object oi. the invention is to provide means by which a cable splicor may (1) monitor on a cable pair to determine whether it is in use or not, (2) talk, listen and. dial, and receive calls from a central otiice.
  • the receiver Viith the key in the normal or M position, the receiver is connected across the line, and the transmitter is cut out.
  • the operative circuit is as follows: A, condenser 5, closed contact 7, receiver 1, and B.
  • the receiver circuit is the same as that in the case of the first position of the key.
  • the transmitter circuit is closed as follows: transmitter 2, contact 9, and battery 3.
  • the dialing circuit is: A, contact 7, contact 10, and B.
  • a telephone substation set including a transmitter, a local battery therefor, a re DCver, a condenser, an induction coil, an alternating current annuneiator, a second condenser associated therewith, a dialing arrangement, and a three-positionswitching means, which switching means in the first posit-ion connects the receiver and the first condenser across the line and cuts out the transmitter; in the second position connects the receiver and the first condenser across the line, closes a circuit including the trans mitter and the local battery, and prepares a dialing circuit; and in the third position connects across the line the alternating cur rent annunciator and the second condenser.

Description

'W. H. EDWARDS TELEPHONE SUBSTATION CIRCUITS Feb. 2 1926.
Filed Dec. 24, 1923 W ATTORNEY Patented Feb. 2, 1926.
UNITED STATES WILLIAM H. EDWARDS, OF BROOKLYN, NEW YORK, ASSIGNOR TO AMERICAN TELE- PHONE AND TELEGRAPH COMPANY, A CORPORATION OF NEW YORK.
TELEPHONE SUBSTATION CIRCUITS.
Application filed December 24, 1923. Serial No. 682,529.
To all whom it nmg concern:
Be it known that I, TVIL'LIAM H. En wninns, residing at Brooklyn, in the county oi Kings and State of New York, have invented certain IIIJPL'OVGIHQIltS in Telephone Substation Circuits, of which the following is a specification.
' This invention relates to telephone sub station sets, and more particularly to cableincns testing sets which are suitable for use in machine switching central oliice districts The principal object oi. the invention is to provide means by which a cable splicor may (1) monitor on a cable pair to determine whether it is in use or not, (2) talk, listen and. dial, and receive calls from a central otiice.
Applicants lDVQHt'lOn provides tor a circuit arrangement which gives common battery signaling and local battery talking. A. three-position switching means'is provided, which in the normal position permits of monitoring on a cable pair, in the secend position permits of talking, listening and dialing, and. in the third position connects an alternating current annunciator in series with a condenser across the line, for the purpose of receiving calls from the central. ofi'ice.
The circuit arrangement will be more clearly understood when the following dctailed description of the preferred form is read with reference to the accon'ipanying drawing, which shows diagramn'iatically such arrangement.
The apparatus indicated in the circuit diagram includes the receiver 1, the transmitter 2, the local battery 8, an induction coil, the alternating current ringer 4:, the condenser 5, the condenser 6, a dialing arrangement labeled Dial, and a three-position key. The three positions of this key are labeled M, T, and \V. The position M is the monitoring position; the position T is the talking, listening, and dialing positon; and the position 7 is the position used when the cableman wishes to wait for a call from the central otfice. A and B are the cord wires which may be connected to the cable pair selected. The plug and jack c011- nections are indicated on the drawing.
Viith the key in the normal or M position, the receiver is connected across the line, and the transmitter is cut out. The operative circuit is as follows: A, condenser 5, closed contact 7, receiver 1, and B.
With the key in the second position, contacts are closed at 8 and 9, and when the cableman dials, contact is closed at 10. The receiver circuit is the same as that in the case of the first position of the key. The transmitter circuit is closed as follows: transmitter 2, contact 9, and battery 3. The dialing circuit is: A, contact 7, contact 10, and B.
In the third position of the key, contact is made at 11 (and, of course, contacts 8 and 9 are broken) and the alternating current ringer 4t and the condenser 6 are. conneeted in series across the line. The circuit is as follows: A, contact 11, ringer 4, condenser 6, and B.
hat is claimed is:
A telephone substation set including a transmitter, a local battery therefor, a re ceiver, a condenser, an induction coil, an alternating current annuneiator, a second condenser associated therewith, a dialing arrangement, and a three-positionswitching means, which switching means in the first posit-ion connects the receiver and the first condenser across the line and cuts out the transmitter; in the second position connects the receiver and the first condenser across the line, closes a circuit including the trans mitter and the local battery, and prepares a dialing circuit; and in the third position connects across the line the alternating cur rent annunciator and the second condenser.
In testimony whereof, I have signed my name to this specification this 21st day of December, 1923. 1
VILLIAM H. EDWARDS,
US682529A 1923-12-24 1923-12-24 Telephone substation circuits Expired - Lifetime US1571513A (en)

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