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US1627929A - Automatic telephone system - Google Patents

Automatic telephone system Download PDF

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US1627929A
US1627929A US1627929DA US1627929A US 1627929 A US1627929 A US 1627929A US 1627929D A US1627929D A US 1627929DA US 1627929 A US1627929 A US 1627929A
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line
switch
relay
lines
called
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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

  • RODNEY G RICHARDSON, OF CHICAGO. ILLINOIS, ASSIGNOR, BY MESNE ASSIGN- MENTS, TO AUTOMATIC ELECTRIC INC., OF CHICAGO, ILLINOIS, A CORPORATION OF DELAWARE;
  • My invention relates in general to automatic telephone systems, but more particularly to such systems as comprise main and branch exchanges interconnected by trunk 6 lines, the branch exchanges being of the type at present used in large numbers to supply telephone service to large manufacturing es tahl'shmen'ts. department stores, and the like; andthe principal object of the inven- 10 tion is to provide means whereby main to branch exchange calls may be transferred automatically from one station to another at a branch exchange while the main exchange subscriber waits on the line.
  • Fig. 3 shows a modification of the connection of relay 8 of Fig. 2. This modification arranges the circuit so that the first called party is automatically disconnected from the connection afterlhe has transferred the. call to another called party in accord ance with one of the objects of this invention.
  • the subscribers stations such as the substations A and A are of the usual common battery type in which the transmitter and receiver are connected in series.
  • Each substation is also provided with a calling device which is preferably of the type in which a reciprocating dial is operated by the'sub scribcr to produce series of interruptions in the line circuit in accordance with the digits in called numbers.
  • a calling device which is suitable for the purpose is shown in the British patent to Dicker #29,654of 1910.
  • the individual line switches such as the line switches C and C, are of'the well known rotary type in which the wipers have no normal position.
  • a rotary line switch of suitable construction is described in the patent to Lamb, No. 1,193,160, granted August 1st, 1916.
  • the connector switches including both the incoming connectors and the local connectors are mechanically of the type disclosed in the patent to Faith, Erickson'and Erickson, No. 815,176, granted March 13, 1900.
  • the circuits are modified, however, in ac cordance with the two-wire system of control and the circuits of the incoming connectors are further modified to accomplish the objects of this invention as will be fully. explained hereinafter.
  • these switches are preferably of the type commonly known as selector connectors. the construction and utility of which are explained fully in the patent to Dealtin No. 1,164,479, granted December 14, 1915.
  • the trunk line comprising conductors and 3 may be one oil a group of trunk lines which terminate in a certain second or third selector level at the main exchange, and which extend through repeaters to the branch we change, terminating there in. incoming connectors like the connector I) (Fig. 1). As shown herein the trunk line terminating in the incoming connector l) is adapted for use in one direction only. that is. it can only be used on calls from the main exchange to the branch exchange.
  • trunk lines (not shown) which are accessible to the local selector connec- It will be understood of course that by the usual expcdients the trunk line shown can be adapted for two'wajv service. llut since my invention is not particularly concerned with this it has been considered advisable to show the trunk' line in the simplest form possible.
  • a local connector trunk comprising conductors 130 to 182, inclusive, which is znultipled to the contact set comprising contacts llet 101117 in the bank of the line switch C and also to a contact set comprising contacts 122 to 12%, inclusive,
  • a special trunk extending to the incoming connector D is also shown comprising conductors 85 to 88, inclusive, which terminate in the contact set comprising bank contacts 118 to 121, inclusive, of line switch C, being also multipled to corresponding contact sets in the line switch- C and. the other line switches.
  • Sufiicient local selector connectors will of course be provided to handle the maximum number of simultaneous local and branch to main, exchange calls.
  • the incoming connectors aml associated trunk lines will also be provided in sufficientnumber to handle the main to branch exchange calls. Ordinarily more local conncctors will he required than incoming connoctors, and if we assume that.
  • everytbird contact set in the line switch banks may U0 assigned to a special inpoming connector trunk.
  • the line switches are provided with fourth wipers which in the case contact set comprising bank contacts to 74, inclusive, in the bank of the incoming connector, being multipled in the usual way to corresponding contact sets in the banks of the other incoming connectors.
  • a groupof normal conductors comprising conductors 140 to 142, inclusive
  • mittent ringing equipment which are oftbe usual type common in other automatic telephone systems.
  • the calling subscribcr may now operate his calling device in :ir-c-iidainc with the iirst of the two ⁇ ligis which are to control the operation of the connector l
  • a series of interruptions is ac ord ngiy produced in his line circuit which are repeated in the well knownmanncr by the ma n exchange repeater into the cncrgizing circuit of the line relay 4.
  • the line relay will therefore be deenergized a number of times andat each dcenergization transmits an impulse of current to the vertical magnet over the following path: ground at G, armature 26 and its resting contact, armature 27 and its working COllttll t. winding of the low resistance slow acting private control relay 1t winding of the vertical magnet 18. and the side switch wiper 23 in first position to battery.
  • the shaft of the incoming connector is raised step by stop until the wipers (30 to 61. inclusive, arrive opposite the required .horizontal level, of bank contacts.
  • Relay 16 is energized in series with the vertical magnet, and being slow acting, retains its armature during the series of impulses to clo'e an energizing circuit for the private inagne. 17. At the end of the vertical movement of the switch, relay 16 and the private magnet are dcenergized, the latter controlling the side switch in the usual. manner to advance its Wipers to their second position.
  • the calling subscri'ier may now operate his calling device in accordance with the final digit, thereby producing another series of interruptions in his line circuit which are re; peated the line relay 4.
  • the line relay sends at each deenergization an impulse to the rotary magnet 19 in the well understood manner.
  • the rotary magnet is operated to rotae the wipers to 64, inclusive, until they C(illlit into engagement with bank contacts to 74:. inclusive, these contacts being the once comprising the contact set which is allotted to the line of substation A.
  • the slow acting relay l6 and the private magnet- 17 are operated during the second series of impulses as before and at the end of the rotary movement of the switch if the called line is idle the private magnet is deenergized to advance the side switch wipers to their third position.
  • the ringing generator (ten is interu'iittcntly cut out of the above circuit and the ground connection at (i is substituted therefor from which it follows that the ringer at substation A will be sounded at intervals to call the subscriber to the telephone.
  • the ring cut off relay 10 is so adjusted that it does not energize as long the receiver at the called. station remains on the hook.
  • the cut off relay 10 at the connector I is instantly energized either by current from the main battery alone or by current from the battery and ringing generator in series, and upon attracting its armature establishes a locking circuit for itself as follows: ground at G, otl' normal contact 21 (closed at the first upward movement ot the switch shaft), armature 38 and its working contact, and the lower winding of the cut oil relay 10 to battery.
  • the ring cut oil relay 10 also opens a contact in the busy signalling circuit at its armature 40, prepares a circuit for the relay 1].
  • the back bridge relay 9 is now connected in bridge of the called line and is energized in the usual way over the called line circuit.
  • the ring out 01f relay 10 is so adjusted that armatures 37 and 41 engaged their working contacts before the armature 39 engages its working contact. This adjustment is made in order to connect the back bridge relay 9 across the called line and permit it to energize before the contact in the circuit of relay 11 is closed at armature 39.
  • Relay 11 is given a stiff adjustment and may be permitted to receive a slight impulse of current during the energization of relays 10 and 9 without ill effect, it being understood that it remains inoperative at this time. In addition to opening the circuit of relay 11 at its armature 36 as.
  • the back bridge relay 9 prepares at its armature 35 a circuit for relay 12 which will be described later.
  • Talking current for the transmitter at the calling station may be supplied .in any suitable manner at the main exchange, preferably through the windings of the line relay of the repeater; while talking current for the transmitter at the called substation A is supplied through the windings of the back bridge relay 9.
  • the voice currents follow the path shown in heavy lines which will be apparent without further explanation.
  • the first operation is to pull down the receiver hook at substation A for an instant and then release it.
  • the receiver hook is ulled down the circuit of the called line is roken and the back bridge relay 9 is deenergized to complete a circuit for relay 11 as follows: ground at G", resting contack of armature 36 and the said armature, working contact of armature 3S) and the said armature, contact springs contrrilled by armature 44 of relay 11, the winding of the said relay, contact springs controlled by the armature of relay 16, and the winding of the private magnet 17 to battery.
  • Relay 11 is suilicientl high in resistance to prevent the operation of the private magnet.
  • relay 11 Upon energizing, relay 11 closes a locking circuit for itself at its armature 44 in an obvious manner and at its armature 43 prepares a circuit for the upper winding of relay 12.
  • the operation of armatures 42 and 45 of relay 11 is without particular function at this time.
  • the receiver hook at substation A is held down momentarily and as soon as it rises the back bridge relay 9 is again energized.
  • a circuit for relay 12 is now completed as follows: ground at G, armature and resting contact of the common relay 25, common conductor 57, armature 35 and its working contact, working contact of armature 43 and the said armature, and the upper winding of relay 12 to battery.
  • relay 12 Upon energizing, relay 12 closes a locking circuit through its lower winding by way of its armature 47; at the resting contact of armature 46 disconnects ground G" from conductor 87 and from test contact 120 and its multiples in the banks of the individual line switches; at the working contact of the same'armature completes an energizing circuit through the relay 13 in series with the common relay 25; and at its armature 48 closes a circuit for the stepping magnet 104 of the line switch C as follows: grounded test contact engaged by the test wiper 112 (test contact 116 or similar test contact associated with some other trunk), test wiper 112, conductor 83, bank contact 73, wiper 63, armature 48 and its working contact, armature 51 and its resting contact, winding of the low resistance slow acting relay 14, wiper 60, bank contact 70, conductor 80, interru ter contact of the stepping magnet 104, an the winding of said stepping magnet to battery.
  • Armature 48 of relay 12 is adjusted to close the circuit including relay 14, the circuit just traced, before armature 46 closes the circuit of relay 13, thereby permitting relay 14 to energize slightly before relay 13.
  • the attainment of this result may also be facilitatedby relay 13 a stitl' adjustment so that it will not operatively energize until its core is nearly saturated.
  • Relay 13need be only slightly 'relay 14 of the incoming connector.
  • relay-14 in operating, but some differeiice is necessary in ordertto permit relay .14 to .close its own CllCLllt'jltZ its armature before it is opened at the armature 51 of relay 13,. it is aiso necessary to have armaseparate. from its restmgcontact and its multiples in the-banksiof the other.
  • Hlow acting relay [4 which during the operation of the line switch (I l iasmaintalncd its armaturcs continuously attracted is nOw'deenergized and at the working contact of armature of relay 13 en'gages its An energizing circuit is thus completed for W'hen the test wiper 112.
  • the incoming connector D is restored to normal position in the usual manner.
  • the energizing circuit of the cut off relay 102 of line switch 0 is .openedat the side switch wiper 2a of the connector (or attest wiper 62, it is immaterial which), and this relay immediately deenergizes.
  • the line relay 103 is now energized in the usualmanner over the line circuit and upon attracting its armature closes a new'energizingcircuit for the relay 102 asfollows': ground at G", armature 109 and its working contact,'windin of the relay 102, interrupter contact of tie stepping magnet 104', and the winding of the stepping magnet to battery.
  • the line relay also connects the test wiper 113 to the junction of relay 102 and the stepping magnet as follows: test wiper 113, armature 107 and its resting contact, armature 108 and its work.- ing contact to the said junctionpoint.
  • the relay 8 of the incoming connectorv as follows: ground at G, lower winding of .relay 8, conductor 85', bank contact 119, wiper 111,
  • relay 8 completes a circuitfor the slow acting relay "7.
  • the subscriber at substation A may remain connected; ordinarily, however, as soon as he perceives that the conversation has started satisfactorily on the main connection he will replace his recciver in order to disconnect his own line from the talking' circuit.
  • the energizing circuit of the rela 8 is broken and this relay deenergizes wit tout, however, af- ⁇ acting rela (3 in any way for ground G is disconnecttl at armature 36 of the back bridge relay 9. But at armature 33 of the relay 8 the circuit of the slow acting relay 7 is broken and this relay upon ,dcenergizing momentarily interrupts the holding circuit of the.
  • a call is being.transferred as by the substation A in the case ju t v:-: plainedfor example, the release magnet circult is opened atithe armature 32 of the slow any interference with the branch subscriber (the is transferring the call to another sta- (ion. e
  • rhairge subs'criber ot the proper number to call. Ile tvil'li then re lacehis receiver and lthejinain exchange su scriber can complete the connection as previously described.
  • iRelay 7, u'pon restt-n i'ug, closes the circuitto the release-magimt' 2t) airnur: r10 lure 32, thereby causingv th' c "eiease n'i'agnct to operate and release the vitch iulhe well known manue.r.- lie :ilsofo'pens the circuitof relay 6 fwhic s a slow to re: lease relay and whichremainsui' 'ope-ariut-il. position-long enough to pcigrnitnurgnel"i to release the switch.
  • a calling. subscribers line an automatic connector switch controlled over said line to extend a connection to wit called line, and means controlled over the said called line for releasing and reoperating said switch to transfer the call to another called line.
  • a connector switch inwvhi'ch said trunk terminates, subscribers line's act-usabble to said switch as called lines, and-means controlled by the subscriber on a connected called line for disconnecting the said -connector from his -line and operating it to transfer the call to another line;
  • a subscrilwrs line In a telephone system, a subscrilwrs line, a connector switch and means for operating it to connect with said line, means controlied by the subscriber on the connected line for connecting his line with mid con- -nector over a different path, means. for thereafter releasing said connector, and'means controlled by said subscriber for then operating said connector to connect with another .-7.
  • a connector switch In a .tele hone s stem, a connector switch, a calle subscri i rs line, a calling subscribers line" and means for.
  • controlling s'aid switch over the calling lineto-rpnnect the two lines means controlled by the'called subscriber-for connecting'his line with said switch over a different path, means for thereafter releasing said connector, and means controlled by the said called subscriber for operating said switch to connect the calling line with a second called line.
  • the called line means controlled over the said called line for-releasing and reopcrating said switch to transfer the call to another calledline, and means .whereby the subscriber whoi'has transferred the call can stayin on the c'oiinection or cut himself out lUpIn a telephone system, subscribers lines, an automatic switch operable to extend a: connection to any one of said lines'as a called line, means under control of the subscriber on theconnected called line for'i'eleasing and reoperating said switch to transfer the call to another called line, and means whereby the subscriber whohas transferred thecall can stay in on the connection or cut himself out at his option.
  • a trunk line for handling incoming calls to a branch ex-" change, a connector switch in which said trunk terminates, subscribers liueslaccessible from his line and operate -it to transfer the call to another line,;and means whereby the subscriber who has transferred the call can stay in on the connection or cut himself out at his option.
  • a subscribers line a" connector switch and means for operating it to connect with said line, means controlled by the subscriber on the connected line for connecting his line with said connector over a different path, means for tliereafter releasing said connector, means controlled by said subscriber for then operating said connector to connect with another line. and means responsive to the replacement of the receiver on the line first called for disconnecting such line from said connector.
  • a calling subscribers line controlled over said line to extend a connec tion to a cal'led line, means controlled over the said-called line for releasing and reoperating said switch to transfer the call to another called line, and means for preventing the calling subscriber from releasing said switch while the call is being transferred.
  • a calling subscribers line an automatic connector switch controlled over said line to extend a connection to a called line, means controlled over the said calied line for releasing and reop crating said switch to transfer the call to another called line, and means for preventing disturbance in the receiver at the calling station while the call is being transferred.
  • a trunk line for handling incoming calls to a branch exchange, a connector switch in which said trunk terminates, subscribers lines accessible to said switch as called lines, means whereby the subscriber on a connected called line can disconnect the said connector from his line and operate it to transfer the call to another line, and means for.disconnecting the talking conductors of said trunk line from the talking conductors of said switch while the call is being transferred.
  • a trunk line for handling incoming calls to a branch exchange, a connector switch in which said trunk terminates and means for operating it to complete connections, means controlled at the branch exchange independent of the calling subscriber er disconnecting said con- HCCiOl' from any called line towhich a connection has been completed and for reoperating the said connector to transfer the connection to another line, and means for preventing disturbance .inilzthe receiver at the calling station while *thecall is being transferred.
  • a connector at the l anch exchange for completing a main to branch exchange connection, automatic means for releasing said connector when any "station is called without disturbing the rest of the connection, and means whereby the said connector may be reoperated from either the calling or the called station to transfer the call to another station.
  • a connector switch at the end of the trunk line for completing main to branch exchange connections, a circuit for opeiating said connector including the two sides of said trunk line in series, and a circuit for releasing said connector from any called station and for holding the trunking connection in order to permit a subsequent operation of the same to transfer the call to another station.
  • a line terminating iii an automatic switch, two groups of trunk lines accessible to said switch, means for operating said switch as a trunk selector to connect sai line with the first idle'trunk in one of said groups, means for operating said switch as a finder switch to connect said line with a designated trunk in the other group, and suitable test circuits in said switch for controlling its operation in each case.
  • a subscribers line circuit a combined trunk selector andfinder switch at the exchange individual to said line, two kinds of trunk lines teriiiinating in fixed contacts in said switch, and means for opeiatin said. switch as a trunk selector or as a finder switch depending on the kind of trunk line withwhich it is de.- sired to connect.
  • a subseribers line and line switch individual thereto, two gioups of trunk lines accessible to said switch, means for causing said switch to function as a trunk selector in response to the init ation of a call over said line to select and connect with an idle trunk line in the first group, means for causing said switch to function as a finder switch when the line is called to select a trunk line of the other group, and means for then causing the switch to function as a trunk selector to establish connection with the trunk thus selected.
  • subscribers lines and individual line switches subscribers lines and individual line switches, a group of connectors accessible to said line switches when the associated lines are calling and having access to said lines, a second group of connectors also having access to said lines, but inaccessible thereto when the lines are calling, and trunk lines extending to the connectors of said second group, respectively, and terminating in the banks of said line switches.
  • a connector of the second group the trunk line associated with such connector may be made selectable.
  • a connector switch having a line or controlling'relay, a trunk line terminating in said relay, a plurality of subscribers lines accessible to said switch, individual switches for said lines, and a second trunk line multipled in said individual switches andtcrminating in a second controlling relay in said connector.
  • a connector switch having a line or controlling rolay, a
  • trunk line terminating in said relay, a plurality of subscribers lines accessible to said switch, individual switches for said lines, a second trunk iine multipled in said individual switches and terminating in a-sc ond controlling relay in said connector, and inductive connections joining the talking conductors of one. trunk line,'rcspectivcly, with the talking conductors of the other.
  • a series of selertor switches a final connector accessible to the last of said selectors, means for operating-said switches over the two sides of a calling line in series to set jnp a telephone connection, means for releasing said connector while retaining all of said selectors in operated position and while retaining a connection with the called line, and means for reoperating said connector over the calling line to set up a new connection.
  • a series of selector switches a final connector accessible to the last of said selectors, means for releasing said switches over the two sides of a calling line in series to set up a telephone connection, means for establishing a substitute for said connection foroperating said connector while retaining vall otsaid selectors in operated position, said releasing means controlled by the subscriber onthe line called, and means for reoperating said connector over the calling. line to set up a new connection.
  • a final connectoraccessible to the'last of said selectors meansfor operating said switches over thetwo sides of'a 'calling line in SQIiQS'gtOjSGt up a telephone connection, means for releasing said c'onnector and meansi'v'hcrrby, either party to said connection can reoper'ate said connector to set up a new-connection, while retaining all of said selectors inoperated position.
  • telephone lines, automaticswitches means under the control of a subscriber on a calling one of said 3 lines for operating a series of said automatic switches in order to extend a connection to a called one of said telephone 3 lines, and means, under the control of the subscriber on the said called line for releasing part of said series of automatic switches while still maintaining a connection with the said calling line.
  • telephone lines, automaticswitches means under the control of a subscriber on a calling one of said 3 lines for operating a series of said automatic switches in order to extend a connection to a called one of said telephone 3 lines, and means, under the control of the subscriber on the said called line for releasing part of said series of automatic switches while still maintaining a connection with the said calling line.
  • automatic switches means under the control of a calling -'one'o"f said lines for operat-ing a series of said switches to extend a connection'to a called .one of said lines, is means under the control of the subscriber ou the said called line for releasing part of said series of switches and for extendin ⁇ ; a connection around the released part of" said series of switches. i 10, 37.
  • a telepho'ne'syst em telephone l nes
  • automatic switches means under the control of a calling one of said lines for operating a series of said switches to extend a connection to a calledone of said lines, means including an automatic switch under the control of the subscriber on the said called line for releasing part of said series of switches and for'extending a connection around the released part of said series of :1! switches.
  • automatic switches means under the con trol of a calling one ofsa'id lines for operating a series ofsaid switches to extend a connection to'a'ca'lled'one of said lines, means including a finder switch under the control of the subscriber on the said called.
  • roiilicctlonto a called one of said lines a line switch individual to" said called line, and means controlled by the subscriber on the called line for causing the operation of ..i. said individual switch to release purl of - ⁇ nid series of automatic switches.
  • telephone lines, automatic switches means under the con -t.rol of ajcalling one of said lines for operailing a series of said switches to extend a connection to a called one of said lines, a line switch individual to said called linc, uj idineans controlled by the subscriber on the-called line for causing the operation of no said individual switch to release part of said series of automatic sw tches, while still maintaining a connection with said calling l-ine.
  • telephone lines, 66 auto'inatic switches means under the control of a Subscriber on a calling one of said lim-- for operating a series of said automzui switches to extend a connection to a lilllt'il one of said lines, and means controlled by the subscriber on the called line tori-stublishing a new connection with the calling line before the first established connection is released.
  • telephone linc:-:. automatic switches means under the control of a subscriber on a calling one of said lines for operating a series of said automatic switches to extend a connection to ii callcll one of said lines, tlllll-lllt'illls controlled by the subscriber on the called line form-stubone of said lines, and an automatic switch controlled b the subscriber on the t'illluil line for csta dishing :i new connection with the calling line.
  • calling and called lines means controlled from one of said calling lines for establishing a connection with one of said call l lines, means controlled from the called line for establishing another connection with the calling line, means then operative to release the first established connection, and means controlled by'tlie subscriber on said calling line for then extending the connection to include a second called line.
  • Inc telephone system telephone lines, automatic switches, means controlled from a calling one of said lines for operating series of said automatic switches to extend a connection to- 21 called one of said lines, means controlled from the called line for re leasing and reoperating part of said series of automatic switches to extend the connection to a second called one of said lines, and means for releasing the first called line from the extended connection.
  • a non-numerical switch individual to said line, an operating magnet for said switch.
  • a switching relay therefor, a circuit for said magnet, mean for energizing said switching relay to open said circuit, and ad- (litional means for operating said magnet while said switching relay is maintained energized.
  • a calling line in a telephone system, a calling line, a trunk line terminating in an automatic switch, called'lines accessible to the said switch, relays for rontrolling the operation of said switch, means for connecting said line with said trunk line, means controlled from said calling line for operating said rclays to cause said switch to connect with one of said called lines, means controlled from thccnllcd line for releasing said switch, and other relays in the switch controlled from the said called line for causing said switch to connect with'anii ther of said called lines.
  • a calling line a calling device on the said line, automatic switclngis, called lines, means controlled by the calling device-on the said culling line for operafiin a series of said switches to extend a connection to one of said called lines, I
  • moans controlled from the said called line for releasing part of said series of switches while maintaining a connection with the calling. line, means controlled by the calling device in the calling line for then extending a connection to a second one of said called lines, and means for preventing the calling impulses from being heard by the-subscriber on the first called line during the establishment of the second connection.
  • a series of selectorswitchcs a. final connector switch accessible to the last of said selectors, means for operating said switches over a calling line to set up connection with 0. called line, means for producing interruptions in the called line, means responsive to one of said interruptions for releasing said connector switch and preventing the release of said :rlcctors, and means for reoperating said connector over the calling line to Set up R new connection.
  • :1 wiegfhomj a e'tem an swituh having :2 line relay ('Qllll' l calling line to operate 551ml with n cullml ine, a EHUlltl switch for we; llim: e 2L liiiklk llivlll lt i12- f line. anal mi on the culled l line relzw ⁇ i to imnel'ztle (323. In e.
  • trunk ti 5120i into groups, a pair of wiper: runne i h mill line and lnlliYilllll and mean, for operating mid wiper, all i- (mule-ll to the line to non ⁇ i'hh 5 ii 1m in one group or for ope/rut Winn It will is xlenilml from n only with a trunk in he other group to wumplele the vonnertion f'eiegj-ln-mstem a line, a line inun'iilnzl thereto. a plurality of trawl; linw: ziwwsril l thereto, part.
  • toluphonn iinw, ztuloniatic swittiltls irontruiied from ti culling one of said line: for LXitlltiil'lgg; a cenmmtimi to a culled one of Stliti iinrs.
  • n5 mntrniiutl from the culled iin um of mi" :iution'uitin switvhr ,lFiti for wprmtiug, it to extuiui the ttililftt 1 am it) i: a't-t'tuni ailiit Uni of s-uftl hues, and 1m aim again l'li/ ing and rcopui-aiing mid awuvh in min-n; the connection 1:) it third Qliittl hiuin ⁇ TJPJ ti? SPL'OIXL'I tailed inn: is husy.

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  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Interface Circuits In Exchanges (AREA)
US1627929D 1917-10-13 Automatic telephone system Expired - Lifetime US1627929A (en)

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US120197XA 1917-10-13 1917-10-13

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FR (1) FR500065A (fr)
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE746315C (de) * 1934-06-22 1944-08-01 Normalzeit G M B H Schaltungsanordnung fuer Fernsprechnebenstellenanlagen mit Waehlerbetrieb
US2567190A (en) * 1945-05-14 1951-09-11 Int Standard Electric Corp Telephone exchange system
DE764328C (de) * 1933-12-09 1954-05-24 Mix & Genest A G Schaltungsanordnung fuer selbsttaetige Untervermittlungsstellen mit getrennten Einstell- und Sprechwegen und Rueckfragemoeglichkeit
US2761908A (en) * 1952-08-19 1956-09-04 Automatic Elect Lab Telephone system
US3041406A (en) * 1959-12-14 1962-06-26 Gen Dynamics Corp Inward dialing to private branch exchange

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE764328C (de) * 1933-12-09 1954-05-24 Mix & Genest A G Schaltungsanordnung fuer selbsttaetige Untervermittlungsstellen mit getrennten Einstell- und Sprechwegen und Rueckfragemoeglichkeit
DE746315C (de) * 1934-06-22 1944-08-01 Normalzeit G M B H Schaltungsanordnung fuer Fernsprechnebenstellenanlagen mit Waehlerbetrieb
US2567190A (en) * 1945-05-14 1951-09-11 Int Standard Electric Corp Telephone exchange system
US2761908A (en) * 1952-08-19 1956-09-04 Automatic Elect Lab Telephone system
US3041406A (en) * 1959-12-14 1962-06-26 Gen Dynamics Corp Inward dialing to private branch exchange

Also Published As

Publication number Publication date
GB120197A (en) 1919-06-26
FR500065A (fr) 1920-03-02

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