US1632025A - Automatic telephone system - Google Patents

Automatic telephone system Download PDF

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Publication number
US1632025A
US1632025A US670557A US67055723A US1632025A US 1632025 A US1632025 A US 1632025A US 670557 A US670557 A US 670557A US 67055723 A US67055723 A US 67055723A US 1632025 A US1632025 A US 1632025A
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US
United States
Prior art keywords
relay
selector
impulses
switch
circuit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US670557A
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English (en)
Inventor
George E Dustin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AT&T Corp
Original Assignee
American Telephone and Telegraph Co Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by American Telephone and Telegraph Co Inc filed Critical American Telephone and Telegraph Co Inc
Priority to US670557A priority Critical patent/US1632025A/en
Priority to GB20438/24A priority patent/GB223877A/en
Priority to FR590175D priority patent/FR590175A/fr
Application granted granted Critical
Publication of US1632025A publication Critical patent/US1632025A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements

Definitions

  • This invention relates to automatic telephone systems, and more particularly to large multi-office automatic systems.
  • lts Objectis the provision of an improved trunking arrangement for an automatic telephone system in which connections are established through the medium of serially rela-t-edautomatic switches, and in which one of the switches in a series belonging ⁇ to a major groupv of the system may be omitted to this selector whereupon it automatically hunts for an idle trunk.-
  • the lines in a given group may be reached by means of a smaller seriesof switches than the lines in other groups.
  • Figure 1 is a schematic diagram of the trunking system
  • Fig. 2 is a circuit diagram of a selector arranged to absorb the second digit dialed into it irre spective of the level selected
  • Fig. 3 is a circuit diagram of a selector' arranged to absorb the second digit dialed into it on certain specified levels only.
  • Fig. 1 showsthe organization of a trunking system as appli-ed to an automatic telephone system having an ultimate capacity of one hundred thousandlines.
  • the lines are usually distributed among a plurality of different offices, and the first selectors, which are the switches which respond to the first digitin called telephoneV numbers, may function as oice selectors.
  • the first digit will operate the first or office selector to select the trunk line leading to the proper office and the remaining digits will operate 'a' seconder incomingl selector 14, a third selector 15, and a connector 16, in the selected office, to com ⁇ plete lthe connection.
  • the office which is reached when the first digit dialed is 2 as well as the *other voffices in the system with the exception ofthe one which is reached when the firstdigit dialed is 3, may be equipped to their full capacity, while for the purpose of illu ⁇ stration, it, will be assumed thatrthe office to which the connection is extended ⁇ when 3 is the first digit dialed, has for the time being no more than one thousand telephone lines terminating in it. ⁇
  • connection may be extend! edas follows: fromthe substation 10 by wayv of the individual line switch 11, first or office selector 12, second Vorl incoming selector 14, third or hundreds selector 15,and the connector 16 to the substation 17. This, it will be noted, is the usual trunking arrangement. Assuming, now thatthe subscriber at substation 10 calls the subscriber at the substation 7, the connection may betraced as follows: from the substation 10 by way of the rindividual line switch l1, first selector 12,
  • relay 300 operates and closes a circuit to operate relay 310 as follows: battery, relay 310, 303, 302, 381, 380 to ground.
  • Relay 310 connects ground to lead 309, to cause the selector to test busy to other line switches over a circuit follows: ground 312, 311 to lead 309.
  • the selector switch is now ready to receive the first series of impulses set up by the subscribers calling device, which series ordinarily in a ⁇ multi-oilice district, corresponds to the office code of the number dialed, and relay 300 follows the impulses.
  • relay 320 When relay 300 releases on the first break in the line, a circuit is closed to operate relay 320 as follows: battery, relay 32o, :515, aia, aol, ses, ssi, sse to ground.
  • the primary or vertical magnet 341 also operates in parallel with relay 320 by way of 331 and 332. Relays 31.0 and 320 are made slow-to-release, to prevent them from releasing when relay 300 opens alternately,
  • the vertical magnet 341 follows the impulses set up by relay 300.
  • the selector rod 390 carrying the brushes 327, 328 and 329 is raised one step in the manner well-known in the art, until, when the impulses cease the brushes 327, 328 and 329 are in the proper position to engage with the terminals of the first trunk in the selected level, as soon as the rot-ary magnet 342 operates as hereinafter described.
  • relay 300 When the series of impulses ceases relay 300 remains energized and opens at 302 the circuit through relay 320 which releases. lVhen relay 320 releases Aa circuit is closed to operat-e relay 330 as follows: battery, relay 330, 362, 357, 394, 393, 322, 321, 326, 311, 312 to ground.
  • Relay 330 operated, locks as follows: battery, relay 330,392, 391, 343, 344, 337, 336, 381, 380 to ground.
  • the selector switch is now ready to receive the series of impulses ordinarily corresponding to the thousands digit of the number dialed, but which, in the present case, will be absorbed.
  • Relay 350 also operates in parallel with relay 320 over a circuit as follows: battery, left winding of reny 354, ses, sul, ses, 381, 380 to ground.
  • Relay 350 operated locks as follows: battery, left winding of relay 350, 355, 353, 311, 312 to ground.
  • Relay 320 operates before relay 350, thus disconnecting the rotary magnet 342 from the circuit to prevent it from operating prematurely.
  • relay 320 remains operated during the impulse period and since the rotary magnet 342 cannot operate while relay 320 is operated, the second series of impulses will be dissipated before relay 320 releases and it is therefore apparent, that the second series of impulses will be rendered ineffective before relay v320 releases and permits the rotary magnet 342 to trunk hunt. lhen the second series of impulses ceases, relay 320 releases as previously described and closes a circuit to operate the rotary magnet 342 as follows: battery, rotary magnet 342, 33 335, 356, 357, 394, 393, 322, 321, 326, 311, 312
  • the rotary magnet 342 operated opens at 343 the holding circuit through relay 330, and causes the selector rod 390 to rotate and advance the brushes 327, 328 and 329, to the terminals ofthe rst trunk in the level selected. group selected is busy, ground will be present on terminal 339, and when the rotary magnet 342 releases, a circuit will be closed to re-operate relay 330 as follows: battery, relay aso, 392, ser, 34a, 344, see, sci, 379, 378, 319, 329 to ground.
  • Relay 330 operated, closes the circuit previously described to operate rotary magnet 342, thus causing relay 330 to release and the selector rod 390 to rotate another step and carry brushes 327, 328 and 329 to the terminals associated with the next trunk in the group. This cycle of operations continues until an idle trunk is found. lVhen an idle trunk is found, ground will not be connected to brush 329. Hence, relay 330 will not operate, but a circuit will be closed to operate relay 370 as follows: battery, relay 330, 392,391, 343, 344, 360, 361, 370, 311, 312 to ground. Relay 370 has been previously shunted out by ground at 329 or 380. Due to the high re ⁇ sistance of relay 370v relay 330 will not operate. vRelay 370 operated releases relay 300; connects lead 307 to brush 327 by way of 372, 373, and 317; lead 308 to brush 328 1f the first trunk in the,
  • the selectorjswitch shown in Fig. 2 is. a
  • This selector switch absorb-s the second digit dialed into it irrespective of its character.
  • Fig. 2 in conjunction. with Fig. 1 let usr assumethat the calling fsub-' scribers station 10 (Figpl) desires to call the substation 7, then when the circuit from the calling station 10 is extended by wayof theline switch 11, and a standard selector, to the digit'ab'sorbing selector 13 (Figf2), a circuit to operate relay 200 will ⁇ be closed over leads ⁇ 207 and208.
  • Relay 210 will op-- erate and connect ground to le'ad ⁇ f209 by wayV of 211 and y'212,fto cause the selector to ⁇ test busy to other first selectors.
  • a telephone line an automatic switch, means for extending the line to said switch, means for sending a series of impulses to operate said switch to further extend said line, and means in said switch for absorbing the next series of impulses transmitted thereto.
  • an automatic selector switch In combination, an automatic selector switch, trunks Vterminating therein, an impulse sender, a circuit including said switch and sender for directively operating said switch in accordance with a series of impulses, means in said switch for rendering ineffective the next set of impulses while maintaining said switch in its set position, and means thereupon automatically operated for causing said switch to select an idle trunk.
  • a calling line equipped with a calling device, a lirst selector, second selectors, and connectors responsive toy impulses set up by said calling device, ⁇ each selector switch having both a primary and a secondary movement, groups of telephone lines, one of said groups being reached from saidriirst line via said first selector a second selector and a connector, certain others of said groups being reached from said iirst line viapsaid iirst selector, a second selector, a third selector' and a connector, all oi the lines aforesaid being designated by telephone numbers having the same number of digits, and means for preventing said first selector from moving oli normal in a secondary movement until after receiving'a second series 'of impulses dialed into it from saidy calling device whenever a telephone line -reached via said iirst mentioned second selector is called.
  • a calling line equipped with a calling device terminating in a lirst oiice, a second telephone line terminating in a seeond oiiice, a third telephone line terminating in a third oiiice, all ot' said telephone lines being designated by telephone numbers having the same number of digits, a first selector in said iirst ofiice, a series of switches in the second oii'ice operable to connect said calling telephone line with the said second line via said first selector, another series 0fv s vitches in the third ol'lice operable to connect said calling line with the third telephone line via said .lirst selector, said latter series of switches being great-er by one than the former series, each selector switch having both a primary and secondary movement, and means :t'or preventing said lirst selector from .moving oil normal in a secondary movement until after receiving a second series
  • rIn a digit absorbing selector having a primary movement in response to a series of in'ipulses,and an autoiuatic secondary movenient, an oil-normal spring, an impulse relay, a fast relay, a slow to operate relay, a slow release relay, and au electromagnet in eombiinition, a circuit to operate said fast relay under control oi said contact spring and said slow release relay, a circuit to operate said slow to operate relay under control oi said tast relay and said impulse relay, and a circuit controlling said electromagnet under control of said fast relay and said slow to operate relay to prevent said eleetromagnet from initiating the secondary movement of said selector switch until after a second series of impulses has been received. 6.
  • a selector switch means responsive to impulses for operatin thevsame, said switch having primary an secondary selecting movements, an electromagnet, a double wound relay, a slow relay energized during the rst impulse period and deenergized at the completion thereof to energize said double wound relay at the completion ofthe iirst impulse period on certain levels, and during the second impulse period on other levels, and a circuit controlled by said double wound relay ⁇ for e11- ergizing said electromagnet to initiate the secondary movement of said selector switch, in order to absorb or utilize at will a particular series of impulses.
  • a selector switch responsive to impulses, said switch having primary and secondary selectivemovements, a fast relay, a slow release delay energized during the primary movement and deenergized onthe completion thereof to operate said fast relay, a slow to operate relay under control of said Vtast relay in combination with said slow release relay, an electromagnet, and a circuit for said electromagnet so controlled by the relays aforesaid in combination as to prevent said electromagnet from initiating the secondary movement of said selector switch until a second series of impulses have been received, in order to cancel one of the digits in the number without releasing the selector switch.
  • serially related groups of automatic switches responsive to impulses, ⁇ and means comprising circuit arangeinents in each switch of. one or more groups for preventing a secondary movement of said switch on one or more levels until after a second series of impulses has been received by said switch.
  • a telephone line a se-V ries of automatic switches,y means for extending the-line to said switches, means for sending a series of impulses to operate a certain one of said switches for the ypurpose of further extending said line tothe succeeding switch, means in said certain switch for absorbing the next series of impulses trans# mitted thereto, and means effective following the absorption of said series of impulses for transmitting succeeding series of impulses to operate the succeeding switches.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)
US670557A 1923-10-24 1923-10-24 Automatic telephone system Expired - Lifetime US1632025A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US670557A US1632025A (en) 1923-10-24 1923-10-24 Automatic telephone system
GB20438/24A GB223877A (en) 1923-10-24 1924-08-29 Improvements in telephone systems
FR590175D FR590175A (fr) 1923-10-24 1924-10-21 Perfectionnements aux systèmes téléphoniques automatiques

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US670557A US1632025A (en) 1923-10-24 1923-10-24 Automatic telephone system

Publications (1)

Publication Number Publication Date
US1632025A true US1632025A (en) 1927-06-14

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Family Applications (1)

Application Number Title Priority Date Filing Date
US670557A Expired - Lifetime US1632025A (en) 1923-10-24 1923-10-24 Automatic telephone system

Country Status (3)

Country Link
US (1) US1632025A (fr)
FR (1) FR590175A (fr)
GB (1) GB223877A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2557388A (en) * 1947-05-28 1951-06-19 Automatic Elect Lab Automatic telephone system employing finder switches for connecting calling lines tonumerical switches

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2557388A (en) * 1947-05-28 1951-06-19 Automatic Elect Lab Automatic telephone system employing finder switches for connecting calling lines tonumerical switches

Also Published As

Publication number Publication date
GB223877A (en) 1925-09-03
FR590175A (fr) 1925-06-12

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