US2358185A - Telephone system - Google Patents

Telephone system Download PDF

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Publication number
US2358185A
US2358185A US462082A US46208242A US2358185A US 2358185 A US2358185 A US 2358185A US 462082 A US462082 A US 462082A US 46208242 A US46208242 A US 46208242A US 2358185 A US2358185 A US 2358185A
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US
United States
Prior art keywords
line
relay
switch
over
finder
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
US462082A
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English (en)
Inventor
Pearce Owen Avis
Oliver Sidney Hugh
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.)
Automatic Electric Laboratories Inc
Original Assignee
Automatic Electric Laboratories 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 Automatic Electric Laboratories Inc filed Critical Automatic Electric Laboratories Inc
Application granted granted Critical
Publication of US2358185A publication Critical patent/US2358185A/en
Anticipated expiration legal-status Critical
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/58—Arrangements providing connection between main exchange and sub-exchange or satellite
    • H04Q3/62—Arrangements providing connection between main exchange and sub-exchange or satellite for connecting to private branch exchanges
    • H04Q3/625—Arrangements in the private branch exchange

Definitions

  • the present invention relates to telephonesystems and is more particularly concerned with private automatic branch exchange systems of the type provided with facilities for enabling local subscribers to gain access to a main exchange line by dialling. a special digit or exertin some other special control.
  • the invention moreover relates to systems of this type having local'connections completed over local finder-connector links while main exchange connections, both incoming and outgoing; are completed over exchange finders having their banks multipled' to those of the local finders.
  • Such a layout lends itself readily to the provision of arrangements 'whereby any one of a number of subscribers may answer incoming main exchange calls and also whereby main exchange calls may be transferred from one party to another.
  • the main object of the invention is to provide improved and simplified arrangements for controlling the setting of the exchange fin'der switches:
  • the marking'of a subscribers-line in the banks-of finders of the two types is-selectively effected over the same contact of'th'e subscribers line'relay.
  • a t-contacts r lthe cut-off 'relayfK is disconnected from the incoming xP'leadc to mark the line" as busytothe link connector switches; at contacts r2 markingbatteryvia'; resistance YA is extended over resting contact's lc l'tobank LFS5 of the local link finderswitches, and at-cont'acts r3 earth is 0 ex'tended o'ver resting contact-$165 via suitable allottin'g equipment lll to operate the start relay ST in the local linksh'own which is" assumed to be'the one allott'ed fo r use.
  • K is connected to the incoming P lead which how ever remains busied by virtue of the low resistance tacts M and k5 the markingand start circuits so-called transfer relay TR, not shown but assumed to be provided in the local link, will have been operated in this instance, on the release of relay B earth is connected over contacts hi and contacts tr of relay TR and wiper and bank CS5 and then over the J lead to operate the R relay 7 'of the called local party in addition to his K.
  • transfer relay TR not shown but assumed to be provided in the local link
  • Relay A responds and at its contacts al transmits im' pulses over lead 12 extending to the connector switch driving magnet, whereupon the wipers CSl-CSS are advanced to the required position.
  • connection is effected over the connector switch -operate the;cal1in g party's line relay R... With both relays R :and K operated-the marking batterypotential is transferredto bank EFSl of the exchange finder switch EFS, while the start earth potential is extended to the exchange finder start lead l3.;
  • Theexchange finder switch EFS "now rotates ;in search. of; the callingline ma kin a d when; r ach s q :position thetest relay' I'I operates.
  • the method of line marking according to the invention finds particular advantage in cases of larger capacity P. A.-B. Xs where it may be necessary to utilise switches of the two-motion type; which require'se'parate markings for the two directions of motion when used as-finders. 15 nch arrangements are shown in essencein Brit- .ish Patent No. 554,137, issued Sept. 16, 1943,
  • trunk line outgoing'from said exchange to another exchange, automatic switching equipment at said first exchange over whichlocal calls between said subscribers lines are completed, said equipment including a connector switch having a difierent position for each called subscribers line and having a specialposition characteristic of said trunk line, apparatus individual to each subscribers line at times operated-over said connector switch whilesarne occupies the position corresponding to that subscribers' line and at other times operated over said switch while some occupies the position characteristic of said trunk line, and a finderswitch at said first exchange terminating said trunk line and efiective responsive to the operation of said apparatus individual to any subscribers line to search for that subscribers line.
  • subscribers lines, a trunk line, a connectorswitch, wipers on said switch having different positions corresponding respectively to the different ones of said lines, means for seizingsaid switch and operating its wipers to a position corresponding to any of said lines, a finder switch terminating said trunk line and having access to all of said subscribers lines, a circuit individual to each one of said subscribers lines for starting said finder switch to hunt for that one of said subscribers lines, means for at times completing said start circuit over a wiper of said connector switch while same occupies a position corresponding to said one subscribers line and means for at other times completing said start circuit over a wiper of said connector switch while same occupies a position corresponding to said trunk line.
  • a finder switch efiective responsive to the intitiation of a call by any of said subscribers lines to search for and seize that line, a connection thereafter extended from the calling line over said finder switch to said connector switch, means for operating said connector switch directively over said connection thereby to move its wipers to a position corresponding to said trunk line or to any desired one of said subscribers lines, a finder switch terminating said trunk line and having access to all of said subscribers lines, a circuit individual to each one of said subscribers lines for starting said last finder switch to hunt for line relays over its associated line, a finder switch having access to all of said lines and effective upon operation of said line relay to search for the line associated with said relay, means resaid out off relay upon its operation, switching apparatus controlled over said line and said finder switch in series thereby at times to extend a connection to another one of said subscribers lines and
  • a plurality of subscribers lines each having a line relay and a cut off relay
  • means for operating any of said line relays'over its associated line a finder switch having access to all of said lines and efiective upon operation of said relay to search for the line associated with said relay, means responsive to said switch finding said line for operating the cut off relay associated therewith, thereby to restore said line relay tonormal, an alternative sponsive to said switch finding said line for operating the out off relay associated therewith, thereby to restore said line relay to normal, an alternative circuit for said line relay prepared by circuit.
  • a plurality of subscribers lines each having a line relay and acut off relay, means for operating any of said line relays over its associated line, a finderswitch having access to said lines and eflective responsive to such operation of a line relay to search for and seize the line associated with that relay, means for at times operating any out off relay thereby to prevent its associated line relay 'from being operated over the associated line, an alternative circuit for said line relay prepared by said out off relay upon its operation, means for operating said line relay over said alternative circuit, and a second finder switch having access to all of said lines and efiective responsive to such operation of said line relay over said alternative circuit to search for the line associated with that line relay.
  • a telephone system a plurality of subscribers lines, two finder switches each having access to all of said lines, a line relay and a cut off relay for each of said lines, means for at times operating both of the relays associated with a particular line concurrently and for at other times operating each of the relays associated with that line alone, means controlled by said relays for causing one of said switches to search for said particular line whenever a parti-cular one of the relays associated with that line is operated alone and for causing the other of said switches to search for said particular line whenever both of the relays associated with that line are operated concurrently.
  • a telephone system a plurality of subscribers lines, two finder switches each having access to all of said lines, a line relay and a cut off relay for each of said lines, each said line having a circuit extending over a make contact on its associated cut ofi relay for causing one of said switches to start hunting for that line and a. circuit extending over a break contact on its associated cut off relay for causing the otherof said lines including the same contact on the line relay for that line.
  • each of a plurality of subscribers lines is connected in multiple to the banks of two finder switches, andwherein each of said switches at times is operated to hunt for a marked subscribers line, a line relay and a cut oil relay individual to each subscribersline, each linealso having a vcircuit extending over a front contact of that line's cut ofi relay for at times marking said line in the bank of one of said switches and another circuit extending over a back 'contact of that lines cut off relay for at times marking said line in the bank of the other of said switches, and both of the marking circuits for each line including the same contact on the line relay for that line.
  • a subscribers line a line relay normally connected to said line, means for at times operating" said relay' over said line, a cut ofi'relay operated at other times to disconnect said line relay from said line, a contact on said out off relay efiective at such other times to prepare an alternative circuit for said line relay, means for operating said line relay over said alternative circuit, and. a switch efiective responsive to the operation of said line relay over said alternative circuit but not responsive to the operation of said line relay over said line for extending a connection to said line.
  • a subscribers line a line relay normally connected to said line and operable thereover, a cut ofi relay associated with said line, a numerical switch in whose bank appear a plurality of lines including said subsoribers line, means for seizing said switch and operating it to any line of said plurality, means in said switch for operating said cut oil relay when said switch is operated to said subscriber's line thereby to disconnect said line relay from said subscriber's line, a contact on said cut off relay thereupon efiective to prepare an alternative circuit for said line relay, means for at times completing said alternative circuit over said switch thereby to operate said line relay, and another switch efiective responsive to the operation of said line relay over said alternative circuit but not responsive to an operation of said line relay over said subscriber's line for extending a connection to said line.

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  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Exchange Systems With Centralized Control (AREA)
  • Structure Of Telephone Exchanges (AREA)
US462082A 1941-12-18 1942-10-15 Telephone system Expired - Lifetime US2358185A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB16334/41A GB554136A (en) 1941-12-18 1941-12-18 Improvements in or relating to telephone systems

Publications (1)

Publication Number Publication Date
US2358185A true US2358185A (en) 1944-09-12

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ID=10075412

Family Applications (1)

Application Number Title Priority Date Filing Date
US462082A Expired - Lifetime US2358185A (en) 1941-12-18 1942-10-15 Telephone system

Country Status (5)

Country Link
US (1) US2358185A (enMihai)
BE (1) BE554136A (enMihai)
FR (1) FR933193A (enMihai)
GB (1) GB554136A (enMihai)
NL (1) NL62663C (enMihai)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3176080A (en) * 1959-12-11 1965-03-30 Gen Dynamies Corp Night answering and transfer of trunk calls
US3197567A (en) * 1961-03-07 1965-07-27 Int Standard Electric Corp Circuit arrangement for pabx-systems
US3242266A (en) * 1961-09-11 1966-03-22 Siemens Ag Circuit arrangement for relay controlled pbx installations

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3176080A (en) * 1959-12-11 1965-03-30 Gen Dynamies Corp Night answering and transfer of trunk calls
US3197567A (en) * 1961-03-07 1965-07-27 Int Standard Electric Corp Circuit arrangement for pabx-systems
US3242266A (en) * 1961-09-11 1966-03-22 Siemens Ag Circuit arrangement for relay controlled pbx installations

Also Published As

Publication number Publication date
NL62663C (enMihai)
FR933193A (fr) 1948-04-13
BE554136A (enMihai)
GB554136A (en) 1943-06-22

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