US1845604A - Switching arrangement for automatic telephone systems - Google Patents

Switching arrangement for automatic telephone systems Download PDF

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Publication number
US1845604A
US1845604A US477730A US47773030A US1845604A US 1845604 A US1845604 A US 1845604A US 477730 A US477730 A US 477730A US 47773030 A US47773030 A US 47773030A US 1845604 A US1845604 A US 1845604A
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United States
Prior art keywords
relay
marking
section
circuit
line
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Expired - Lifetime
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US477730A
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English (en)
Inventor
Johnson Karl Georg
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Telefonaktiebolaget LM Ericsson AB
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Telefonaktiebolaget LM Ericsson AB
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/04—Features relating to lubrication or cooling or heating
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/0016—Arrangements providing connection between exchanges

Definitions

  • the present invention relates to -a :switchv-r Ving arrangement in automatic telephone' systems. More especially it relates to medium sized telephone plants ot'said kind. In proj ect-ing such plants it has hitherto been necessary Ato design the system for ⁇ a certain maxi'- mum capacity already from lthe beginningvin View of the expected ⁇ future'ldevelopments of the telephone net.' The erection' costs per subscribers line for such a system will then, however, be unproportionately high.- Systems are known which allow a successive building out of an automatic telephonev exchangey having a smal-l capacityby adding an arbitrary number of .independent exchanges of substantially the same capacity.
  • the tralic in both directions between the differentV exchanges may then be carried over external junction lines Iwh-ich by means of non-numerical selectors disposedat'each end of the lines may be connected :to-internal junction lines in eachV one of-the difierent exchanges.
  • the'di-ferent telephone exchanges form only diiierent sections of a larger telephone exchange in-whichcasethey need not necessarily be disposed .in the same locality but may be disposed at1suitable places.
  • the present invention relates to systems of the latter kind. Moreespecially it frelatesto such systems in which the Vnumericalfsele'ctors only are ⁇ adaptedvto mark thefwanted subscribers lines and junction lineswhereas the talking connections are established over separate connecting apparatus, preferably operating as searchers'. Said; numerical 1s ⁇ electors together with the apparatusco-operating therewith will Yin thevfolloweing, ⁇ on account of their purpose to ⁇ register the wanted number and to mark the linescor- Y responding thereto, be called marking Aregisters.
  • the invention has forits object :to design such marking registers in such a-manner that the telephone-plant Amay be .extended-in above described mannerbythe additionwof new exchange sections Without .then .subjecting the marking register system to any considerab'le alterations.
  • the A marking s registers are,accord1ng to the ⁇ A1nd vention, so designed that they maymark a lines.
  • marking registers are preferably of the kind which comprise, on the one hand, an impulse receiver ⁇ consisting of one or more marking selectors and, on the other, a marking relay -set usuoperate with, an impulse receiver appertaining to any exchange section.
  • an impulse receiver ⁇ consisting of one or more marking selectors and, on the other, a marking relay -set usuoperate with, an impulse receiver appertaining to any exchange section.
  • a ally common to a plurality ofimpulseA remarking relay set is provided 'for each exchange section, each'relay set then controlling only the marking circuits 'for the corresponding exchange section.
  • Figures 3a andbtak'en together present adetailed circuit diagram of suchxa telephone plant, only two sections being however shown.
  • the internal junction line FLl of the section A is connected by means of the searcher ABSl to an inter-exchange unction line AB adapted to mediate the inter-exchange trai-lic between the sections which line, by means of a Searcher ABS2 disposed at the opposite end of the line, selects a free internal junction line FL2 in the section B whereupon connection is obtained with the wanted subscribers line over his selector S2.
  • the connection is instead preferably established over the junction line BA and the searchers BAS2 and BAS1 although also such inter-exchange junction lines may be provided, which each allow trafc in both directions.
  • the four sections indicated in the figure are mutually connected together by means of inter-exchange junction lines AB and BA, AC and CA, AD and DA,
  • BC and CB, BD and DB, and CD and DC in such a manner that a subscriber in any one section may call a subscriber in any other section of the plant.
  • All the subscribers lines connected to the different sections are included in the same ⁇ numerical series and it is, consequently, posd telephone from his set APl and by his sesible to obtain communication with one an the same line by calling the same number from any subscribers line in the entire net.
  • the plant thus technically is divided into a number of substations it constitutes, from the point of view of the subscribers, a unitary central which, as regards its operation, is identical with a central of a larger type.
  • FIG. 2 shows principally how connections may be established between the sections A, B and C.
  • the different sections may, by way of example, be made in accordance with the system described in the Swedish Patent No. 54.793.
  • the subscribers apparatus AP in each section may be connected over subscribers lines AL with the appertaining relays LR and the selectors S, allotted to the subscribers lines, to any ⁇ one of a number of internal junction lines FL accessible in common for all the sections.
  • Said interna-l j unction lines are preferably brought together in groups, to each group being then allotted a marking register R which by means of relays SR may be connected to any one of the appertaining junction lines.
  • Said marking registers are only adapted to select and, in a certain manner, to mark the wanted subscribers line whereas the talking connection is established over the selectors S in such to the internal junction line FL to which the calling subscriber has connected himself by means of his selector S.
  • rlhe marking registers are adapted to co-operate with the marking relay set GR common to the sections, which set controls the marking circuits MT and which may be connected to any one of the marking registers R in any of the sections A, B, C over connecting apparatus AO, which may be of any arbitrary kind such as searchers or relays, and over lines ML eX- tending'through all the sections and being Connected in multiple to the apparatus AO.
  • inter-exchange junction lines AB, BA, AC, CA, and BC, CB are disposed together with the appertaining searchers ABS1, ABS2, BASl, BAS2, ACSl, ACS3, OASI, CAS3.
  • each section has a capacity of two hundred lines, an arrangement according to Figure l having four sections and thus representing a capacity of eight hundred lines.
  • the Searcher stops and the calling subscribers set APl in the section A is connected to a free internal junction line FL3 in the section C.
  • the register R1 is connected over the appertaining marking line ML and the connecting apparatus A03 to the marking relay set GRS of the section C if said set hasA not been previously engaged by any register. rThe number is then transferred in known manner to GRS which closes a marking circuit over the wanted subscribers marking wire MT3.
  • the called subscribers selector S3 is started and hunts for the internal junction line FL3 in section C marked over the internal junction line FLl in thesection A and over the inter-exchange junction line AC.
  • the registers are adapted, by means of relays GA and GC respectively corresponding to the connecting devicesAO in Figure 2, to be connected to marking relay set GR in the wanted section.Y If the wanted subscriber 'belongs to another section than the calling section the register is connected over a. line ML to the marking relay set of the section in question.
  • av current path 7 is v closed through the lock magnetsSMO, SMH, SMT and SMU in the marking. selectors-:RS and the sequence switch'SO.
  • the register is marked busy by closing the contact 8 of RTP
  • the sequenceswitch SO was actuated over the circuit 6 its Contact farms were advanced to the second position of .the sequence switch. Inthis position a current path 9 of a buzzer current'source SU is closed through a winding HL of the impulse relay RI whereby the subscribers attention is called to the fact that the register has been connected into circuit and is ready to receive the impulses. The subscriber then sends the impulses.
  • the relay RT2 After the impulses ⁇ in )the rstimpulse series have been sent the relay RT2 is de-energized the Ycircuit 6 being ⁇ then closed and bringing about a forward displacement of the sequence switch SO into the third position. Throughthe then succeeding impulse series corresponding to the tens digit in the subscribers number, the marking selector RSTHis set whereupon the sequence switch SO in similar manner as before is advanced into the fourth position.
  • the marking selector BSH stops in its sixth position and when the selector RT2 after the first impulse series is de-energized the relay AR,L is energized over the circuit 13 and forms a current path 28 over the hundreds selector and the starting relay FSR of the inter-exchange junction line.
  • the latter relay is energizedand closes an impulse circuit 29 through the driving magnet FDRl o1 the inter-exchange junction line searcher ACSl. Further the relay FSR prepares a test circuit 30 through the relay LYRl.
  • vlatter relay is energized and disconnects the register at its contact 34 of the a-wire of the internal junction line FL3 and marks the line busy over the contact 35 of the c-wire.
  • the relay LYR3 is energized and receives holding current over .its contact 36. The calling subscriber in the section A is thus connected to a free internal junction line in the section C.
  • All the wires MLM which are the object of the selecting operation of said selectors, may by means of relays GA31 be connected to the marking relay set G33 in the section C. In similar manner said wires may be connected through a relay GA21 to the marking relay set in a section B, Figure 2.
  • the relays GAM, GAM, and GA31 correspond thus to parts of the connecting apparatus AOl and AO2 and AOS respectively in Figure 2.
  • the relay @A31 is controlled by the circuit 37 which was formed in energizing the relay FER over the circuit 30 when the selector ACS1 found the junction line FLl.
  • the relay SAM is energized and closes the circuit 2,5 for the relay STR which disconnects the register and closes a holding circuit for itself over its contact 26.
  • the relay LR1 is cle-energized whereby the relay STR is deenergized. This results in that the relay LYB1 is cle-energized and then also the re- L.
  • Said relays cause then, if the subf 1.
  • a telephone system comprising a numi ating as searchers, and means to mark both al subscribers line appertaining to the own exchange section, and a subscribers line belonging to another exchange section and an interexchange junction line extending to the latter exchange section from the marking register belonging to the calling station.
  • a telephone system comprising a number of automatic telephone exchanges mutually connected by means of inter-exchange junction lines, means to connect up the subscribers lines over internal junction lines to marking registers consisting of an impulse receiver and a marking relay set cooperating with said receiver and controlling the marking circuits of the own exchange only, means to mark both a subscribers line appertaining to the own exchange and a subscribers line belonging to another exchange and an inter-exchange unction line extending to the latter exchange from the marking register belonging to the calling station.
  • a telephone system comprising a number of automatic telephone exchanges mutually connected by means of inter-exchange junction lines, means to lconnect up the subscribers lines over internal junction lines to marking registers consisting of an impulse receiver and a marking relay set cooperating with said receiver and controlling the marking circuits of the own exchange only, means to mark both a subscribers line appertaining to the ownexchange and a subscribers line belonging to another exchange and an inter-exchange junction line extending to the latter exchange from the marking register belonging to the calling station and means to engage the marking relay set of the own exchange upon calls to another exchange first after the calling subscribers line has been connected over an inter-exchange junction line to an internal junction line in the latter exchange section.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mechanical Engineering (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Structure Of Telephone Exchanges (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
US477730A 1929-08-28 1930-08-25 Switching arrangement for automatic telephone systems Expired - Lifetime US1845604A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE361927X 1929-08-28

Publications (1)

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US1845604A true US1845604A (en) 1932-02-16

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US477730A Expired - Lifetime US1845604A (en) 1929-08-28 1930-08-25 Switching arrangement for automatic telephone systems

Country Status (5)

Country Link
US (1) US1845604A (de)
BE (1) BE361927A (de)
DE (1) DE571977C (de)
FR (1) FR703190A (de)
GB (1) GB361927A (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2597007A (en) * 1942-03-31 1952-05-20 Int Standard Electric Corp Common control circuit for operating switches rearward to calling line
US2711444A (en) * 1951-05-19 1955-06-21 Nederlanden Staat Junction diagram for automatic switching system
US2813929A (en) * 1951-11-12 1957-11-19 Nederlanden Staat Automatic signalling system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2597007A (en) * 1942-03-31 1952-05-20 Int Standard Electric Corp Common control circuit for operating switches rearward to calling line
US2711444A (en) * 1951-05-19 1955-06-21 Nederlanden Staat Junction diagram for automatic switching system
US2813929A (en) * 1951-11-12 1957-11-19 Nederlanden Staat Automatic signalling system

Also Published As

Publication number Publication date
BE361927A (de)
FR703190A (fr) 1931-04-25
DE571977C (de) 1933-03-10
GB361927A (en) 1931-11-27

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