US2442092A - Testing arrangement for finder switches in telephone systems - Google Patents

Testing arrangement for finder switches in telephone systems Download PDF

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Publication number
US2442092A
US2442092A US567224A US56722444A US2442092A US 2442092 A US2442092 A US 2442092A US 567224 A US567224 A US 567224A US 56722444 A US56722444 A US 56722444A US 2442092 A US2442092 A US 2442092A
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United States
Prior art keywords
marking
finder
relay
finders
wiper
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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
US567224A
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English (en)
Inventor
Mcclew John William
Pearce Owen Avis
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Automatic Electric Laboratories Inc
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Automatic Electric Laboratories Inc
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Publication date
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Application granted granted Critical
Publication of US2442092A publication Critical patent/US2442092A/en
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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 finder switch arrangements suitable for use in telephone or like electrical signalling systems, and is more particularly concerned with improvements in arrangements by means of which a marked line can be connected to equipment of difierent classes all serving a number of such lines.
  • finder/connector links are usually provided and are allotted for use under control of one or more common equipments. Calling lines gain access to these socalled local links via the finder portions of the links which hunt for line markings having finder bank positions characteristic of the calling subscribers concerned. Subsequently, in response to dialled digits characteristic of local subscribers, the connector portions of the links effect local au tomatic connections. In response to certain other characteristic dialled digits, other finder switches may be started up to connect the calling subscrlbers concerned direct to special service links.
  • a typical special service link connection occurs where two private exchange boards are linked by a tie line.
  • a calling subscriber on one board wishing to gain access to a subscriber on the other board will first dial a characteristic prefix digit or digits in response to which the local link taken into use will cause the tie line link to connect itself over a finder switch with the calling party, the local link then being released for further common use.
  • the tie line link on being switched through to the calling subscriber will cause a local link on the other board to connect with the distant end of the tie line and further dialled digits which will extend into the tie line link will be repeated to the distant local link to effect connection with the required party.
  • Another example, which occurs particularly on private automatic branch exchange boards is the association of a main exchange line link with a calling subscribers line.
  • test conditions for more than one type of finding operation can appear together in the local link finder switch test bank multiple, the question of possible cross switching will naturally arise.
  • Arrangements have already been proposed whereby test conditions for two differing types of findin operation may appear simultaneously in a common bank multiple without danger of cross switching of the finder switches concerned.
  • a finder switch arrangement suitable for use in telephone or like signalling systems
  • the operation of a finder to connect with a marked one ofa group of lines is under control of a double-wound relay not operative on either winding alone, one winding of the relay being connected in the marking circuit to potential of one polarity while the other winding is connected to the switch wiper and to potential of opposite polarity whereby separate markings of either polarity may be used to control the simultaneous operation'oi other classes of finders having access to the same lines.
  • a finder switch arrangement suitable foruse in telephone or like signalling systems and having similar finders of three different classes adapted to hunt simultaneously over a group of' lines for markings respectively characteristic of the class of finder
  • the marking comprises potential of one polarity applied over a wiper of a finder of the third class
  • the marking comprises potential of the other polarity also applied over a wiper of a finder of thethird class
  • the marking comprises potential of the one polarity applied through the winding of a double-wound relay which is not operative on either winding alone the other winding of the relay being connected markings respectively characteristic of the class:
  • Hairline represent; certain: parts; of the local finder/connector links such as: the: local finderi connector links described in PatentiNo; 2 ,087,930; ranted July 27, 1937, todohnzI-IrVOss; andin these. links.
  • IFS l;:3ESl represent the test wipers and banks. of. theiuniselector finder. switches ICSIi -3GSI representwipers and banks ofthe two-motion.
  • link LL3 this is assumed to be finding an ordinary calling subscriber No. 10, the line relaycontacts; lllLl of which will be operated as shown.
  • the, finder switch in link LL3- is assumed to be operated under the control of allotting equipment AE which includes the allottingswitch AS, the wipers of which will cqnneet llpiwithjink LL3.
  • allotting equip-' mentthe-usual test relay which is usually of similar chara'Qtereto-relays SA and SB has been replaced bya: shunt; field relay for reasons which win; be appreciated: later.
  • relay SA When wiper AFSI reaches this.--marking, relay SA will rapidly operate in :series withthe .battemconnected resistance. YA. and at contacts. SA-L will. open, the, magnet. driving.- circuit. and will extend earth over. lead. Ill-to initiatethe switch ingjthroughofthe calling, line No.2 to. thelink. SAL in known manner. r
  • finder switch BFS in link SBh whichis searching ion subscriber No. 5;.the1ine markingcin tlfisrinstance' will comprise a battery potential which is applied to bank BFSI via resistance YB, bank and wiper ZCSI in link LL2, contacts 2XL, wiper and bank 2FSI and contacts L1.
  • relay SB When wiper BFSI encounters this marking, relay SB will rapidly operate in series therewith and will function in similar manner to relay SA. By virtue of the low resistance of relay SB an immediate guard is placed on the outlet seized and the adjustment of the relay is moreover such that once it has operated, if another similar test relay connects itself in parallel it will continue to hold while the second relay will fail to operate.
  • relay SA is adapted to operate in series with 400 ohms
  • relay SB is adapted to operate in series with 150 ohms and not to operate in series with 400 ohms.
  • Link SAL can never switch in to the 150 ohm battery comprising the marking for subscriber No. 5, since as it is not connected to the wiper of its associated finder relay SA can never encounter such marking.
  • link SBL can never switch in to the 400 ohm battery connected to the link SAL finder switch wiper AFSI, since this constitutes a non-operate condition for relay SB.
  • a line a finder switch having a bank and a movable wiper therefor, a double wound shunt field relay for controlling the movement of said wiper, said relay being operative only in response to the energization of both of its windings, a marking contact for said line in said bank.
  • a finder switch having a wiper, marking contacts for said lines accessible to said finder, a double wound relay operative only in response to theenergization of both of its windings, means: for connecting a potential of one polarity through one winding of said relay to the marking contact of an individual one of said lines, means for connecting a potential of opposite polarity through the other winding of said relay to said wiper, said relay operative upon the engagement of said wiper and said last marking contact to control the movement of said finder.
  • a first group of finders a second group of finders, a third group of finders, marking terminals for said lines in each of said three groups of finders, means for applying a potential of one polarity to the marking terminals of any one of said lines for stopping the movement of one of the finders of said first group,'means for applying a potential of the opposite polarity to the marking terminals of any one of said lines for stopping the movement of one or" the finders of said second group
  • a double wound shunt field relay operable only in response to the energization of both of its windings, means for connecting the marking terminals in said third group of finders for any one of said lines to a potential of said opposite polarity through one of the windings of said relay, means for connecting a potential of said one polarity to a wiper of one finder of said third group of finders through the other winding of said relay, said relay operative upon the engagement of said wiper with one of said last
  • wipers on said finders means for connecting a distinctive marking for one of said-classes otfinders to -marking contacts of-any one of said lines over'awiper of one of thefin-ders of another of said classes, said marking including potentialof one of said polarities, means forconnecting another distinctive lmarking-rfora further one of said-classes of finders to marking contacts for-any one of said li-nes'over the wiper of another finder-of-saidother class, said other distinctive marking including potential of the other of sai'dpol-aritiesa double Wound relay operative only in response tothe energization of both of its windings,-means for connecting a further .distinctive-marking-for said. other class of finders to marking contacts of any one of said lines, said-further marking including potential of said one-polarity-and one winding of said relay, and
  • finders of three different classes a plurality of lines having test terminals accessible to each of said finders, wipers on said finders, means for permitting the wipers of finders of said three classes to hunt simultaneously over said test terminals, a source of 1 potential I having two polarities, characteristic 'markings of three different classes, means for connecting a characteristic marking of one of saidclasses to test terminalsof one of said lines over a wiper of a finder of one of said classes, said-marking including potential of one of said polarities, meansresponsive to said marking for stopping only afinderof another of said classes on a test terminal of said-one line, means for connecting another characteristic marking of another of said classes to test terminals of another one of said lines over a wiper of another 5 finder of said oneclass, said other marking including potential of the other'of .said polarities, .meansiresponsivefto said other marking for stoppingonly of a finderrof a-iurther-one-ref
  • a group of finders a *characteristicemarking for said findergroup, a line having test terminals accessible to-finders of said group and having marking contacts operable for connecting said test terminals to said characteristic-marking, means including said characteristic marking for stopping a finder of said group on'a test terminal-of said line, other groups oi'finders, test terminals for said line'accessible to finders of said other groups, "different characteristi c markings for each of --said othcr groups, s,aid

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  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Structure Of Telephone Exchanges (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)
US567224A 1944-02-18 1944-12-08 Testing arrangement for finder switches in telephone systems Expired - Lifetime US2442092A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3019/44A GB571811A (en) 1944-02-18 1944-02-18 Improvements in or relating to finder switch arrangements for use in telephone or like signalling systems

Publications (1)

Publication Number Publication Date
US2442092A true US2442092A (en) 1948-05-25

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ID=9750435

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Application Number Title Priority Date Filing Date
US567224A Expired - Lifetime US2442092A (en) 1944-02-18 1944-12-08 Testing arrangement for finder switches in telephone systems

Country Status (4)

Country Link
US (1) US2442092A (enrdf_load_stackoverflow)
FR (1) FR929007A (enrdf_load_stackoverflow)
GB (1) GB571811A (enrdf_load_stackoverflow)
NL (1) NL67487C (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2821573A (en) * 1953-07-24 1958-01-28 Itt Dual-switch finder combination

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1831922A (en) * 1930-02-10 1931-11-17 American Telephone & Telegraph Telephone exchange system
US1837801A (en) * 1927-12-09 1931-12-22 Ass Telephone & Telegraph Co Telephone system
US2278593A (en) * 1938-03-21 1942-04-07 Fides Gmbh Telephone system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1837801A (en) * 1927-12-09 1931-12-22 Ass Telephone & Telegraph Co Telephone system
US1831922A (en) * 1930-02-10 1931-11-17 American Telephone & Telegraph Telephone exchange system
US2278593A (en) * 1938-03-21 1942-04-07 Fides Gmbh Telephone system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2821573A (en) * 1953-07-24 1958-01-28 Itt Dual-switch finder combination

Also Published As

Publication number Publication date
GB571811A (en) 1945-09-10
FR929007A (fr) 1947-12-15
NL67487C (enrdf_load_stackoverflow)

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