US1615998A - nelson - Google Patents

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US1615998A
US1615998A US1615998DA US1615998A US 1615998 A US1615998 A US 1615998A US 1615998D A US1615998D A US 1615998DA US 1615998 A US1615998 A US 1615998A
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relay
circuit
digit
trunk
operator
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/42—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker

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  • the present invention relates to multio'l'llce telephone systems, more especially to such systems as comprise both manual and automatic oilices, or exchanges; and the objcct of the invention, broadly stated, is the provision of new and improved arrangements for handling those calls which originate at a manual ofiice and which are completed in an automatic office.
  • the present invention is in the nature of an improvement over copending application Serial Number 443,688, tiled February 9, 1.921.
  • the particular object of the invention is to provide means whereby the time required for the B operator in the automatic exchange to set up a connection is minimized. This is accomplished by so arranging the circuits at the B operators position that instead of having to wait for the A. operator to seize the assigned trunk line the B operator only registers the desired number. Now as soon as the A operator seizes the designated trunk line the sending operations are automatically initiated.
  • This apparatus includes a sending switch, and a plurality of relay storage devices, together with circuits whereby the digits, correspond ing to successively actuated digit keys, are registered on the storage devices, whereby the storage devices successively control the sending switch according to the registered digits, and whereby the apparatus is auto matically disassociated from the trunk line in use when the connection is completed.
  • the A operator at the manual exchange upon ascertaining the desired called subscribers number, actuates the key of her order wire extending to the proper automatic exchange and gives this number to the B operator therea't.
  • the B operator upon receiving this number, immediately registers it by means of push buttons provided for the purpose. and assigns an idle trunk line to the A operator.
  • the B operator operates the start ing key associated with the sending equipment in. use whereby the sending apparatus starts functioning and the connection is automatically set up, the B operator having to pay no further attention to the connection.
  • the sending equipment is disassociated from the connection and may be used. again.
  • the present invention provides means whereby as soon as the A operator seizes the designated trunk lines relay is energized which automatically starts the sending operation; thus eliminating the necessity of having the B operator actuate a key after the trunk line has been seized by the A operator. Immediately upon being started the sending operation proceeds as outlined above.
  • This automatic starting arrangement enables the B operator to work a great deal faster as she does not have to devote as much time to each individual connection as was the case in the former system.
  • FIG. 1, 2, 3, and 4 of the drawings should be laid out in order with corresponding lines at the ends thereof in alignment. while Figs. 5, 6. and 7 should be similarly laid out im mediately below Figs. 2, 3, and 4:, respcctively.
  • the drawings when thus arranged show an inter-office trunk line connecting a manual exchange with an automatic exchange, and the associated equipment required to establish a connection between two subscribers lines such, for example, as the line of the manual substation A, Fig. 1, and the line of the automatic substation A.
  • Fig. 4 The connection, when established, involves a manual cord circuit such as the cord circuit 0. Fig. 1; an inter-ofiice trunk line, manual to automatic, and associated trunk equipment, shown in Fig.
  • the apparatus shown in Figs. 5, 6, and 7 constitutes a B operators sender which is used to control the setting 01": the automatic switches, and which may be te1nporarily associated with the trunk line for this purpose.
  • the equipment shown in Fig. 1 comprising the telephone station A and the associated line equipment at he exchange, the operators cord circuit 0, and the A operators head set, is all manual equipn'ient ot well known type and on this account will not have to he described.
  • the inter-otlice trunk line comprising conductors 30 and 81, is one of a large groiu') 01" similar trunk lines and extends from the jack J in the outgoing trunk multiple at the A board, in the manual exchange, by way of the B operatofls position, shown in Fig. 2, to the first selector 1), which is shown in Fig. 3.
  • the trunk line is normally open and is provided with a group of relays, whose cir cuits are shown in full, and whose opera tion will also he described in the course of the general explanation.
  • a call circuit, or order wire circuit which terminates in the B operators head set at the automatic exchange, and which is multipled in the call circuit keys at the A board in the manual exchange.
  • the first and second selectors D and E are automatic switches of the well known Strowger vertical and rotary type, such as are in common use in numerous autoi'natic telephone exchanges throughout the country.
  • the connector His likewise a Strowger vertical and rotary switch and is similar in mechanical construction to the selector switches D and E.
  • the circuits are arranged, however, for a directive control in both the vertical and rotary movements. switches are operated according to the well known two wire system of control.
  • the connector switch H has access to 100 subscrihers lines, one of which is the line extending to automatic sub-station A.
  • the reference character C' indicates a rotary line switch of well known type which is individual to the line of substation A, and which is used by the subscriber thereat for making outgoing calls.
  • the l) operators sender showni herein comprises a set of digit keys, shown in the lower left-hand corner of Fig. 2, a sending switch indicated by the reference character S, and including a plurality of associated relays, all of which are shown in 5, a first digit storage device, shown in 6, a second digit storage device, shown in 7, and third and fourth digit storage de vices, which are not shown but are in all therewith.
  • the digit keys, Nos. 1 to O include are ordinary self restoring keys. push buttons, located in a single row in front of the lloperator and control the setting of the storage devices. There is also a release key and a lamp L located in the same row with the digit keys.
  • the sending) switch iii in Fig. 5, is a simple rotary switch havii'ig two horizontal rows ot hank contacts and the two wipers 207 a d 208 associated These wipers are adapted to be driven by any suitable form ol? ratchet mechanism in a forward direction only by means of the stepping magnet 20?.
  • the cam 298 is mounted on a constantly rotatin; shaft which is driven by a small motor, or other suitable means, at a speed ot-about ten revolutions per second. This is the impulse sending cam and may he common to a number of ditlierent senders.
  • the first digit rm. (3, comprises storage device, shown in lhe digit relays 27l270, inclusive, and the five relays 2504254, inclusive.
  • the other storage devices are very similar to the first digit storage dcvic and all of them will he described in full hereinafter.
  • This indicating device comprises a plurality of banks of switchboard lamps, there being a lamp in each bank for each of the ten digits. The number of different banks of lamps will, of course, de-
  • a circuit is completed over the sleeve conductor thereof which includes thecut off relay 5 of the calling line, and the supervisory lamp L in the cord circuit in series.
  • the cut oil relay 5 is accordingly energized and disconnects the line relay l.
  • the supervisory lamp L would. be lighted at the same time were it not for the tact. that the receiver isoit at substation A, whose transmitter is now supplied with current from the cord circuit.
  • the supervisory relay 8 in the ring side of the cord circuit is energizedand shunts out the lamp L to prevent it from being lighted.
  • the A operator will now throw her key K to listening position in order to obtain from the calling subscriber the number of the party with whom he desires to converse. Having ascertained that the desired number is the No. 4567 in the automatic ofhce, the operator will restore her listening key and will depress the proper all circuit button in order to connect her head set with the call circuit extending to the desired oliice, or exchange.
  • the call circuit button at this particular A operatofls position which is associated with the particular automatic exchange in question, is the button P, and when this is depressed the A operators head. set is connected directly with the B operators head set in the automatic otiice.
  • the A operator now repeats the No.
  • the A operator As soon the A operator is through talking the B operator will reply with the number of an idle interotfice trunk line.
  • the A operator now inserts the calling plug of the cord circuit in use in the designated j acl: in the outgoing trunk multiple. Assuming that the trunk line comprising conductors and 31 is the trunk line assigned, the plug will be inserted in the jack J and a circuit is immediately completed over the two sides ot the trunk line in series for the bridged relay so at the B operators position.
  • Relay &0 is energized by current flowing from the cord circuit at the A board and closes a circuit for the busy lamp L. This signal notifies the B operator that the A operator has taken the trunk.
  • the trunk line comprising conductors and 61, connecting Figs. 33 and 3, whereby the first selector D, a second selector, such as the selector F and a connector, such as the connector H, are operated in order to complete connection to the desired subscribers line.
  • the B operator having actuated the various digit keys and the starting or trunk key K, has done all. that is required of her toward the establishment of the connection and need pay no further attention to it.
  • the sender upon which the number has been registered, controls the automatic switch-es without any further attention, and when the last switch has been operated the sender is automatically disassociated from the trunk line and is ready for use in registering another called number.
  • the ten digit relays of the first digit storage device are normally connected to the ten leads, or con ductors, coming from the ten digit keys, and when the operatordepresses the No. l digit key a circuit is completed over conductor- 23% for the fourth digit relay
  • relay 2% prepares a locking circuit for itself at armature 281; connects the grounded conductor 228 to conductor 28% which extends to the No.
  • Relay 274 accordingly energized in series with'relay 274 and at its armature 258 closes a circuit for relays 253 and 254 in series, which, upon energizing, disconnect all of the digit relays 271-270, inclusive, from the conductors coming from the digit keys.
  • Relay 274 remains energized over its locking circuit.
  • Relay 252 also connects ground to he holding conductor 223 at armature 260, and at armature 259 connects ground to conductor 285 extending to the second digit storage device Fig. 7, thus completing a circuit for relays 30 i and 305 in series.
  • these relays Upon energizing, these relays connect the ten digit relays 321 to 320, inclusive, to the ten conductors coming from the digit keys. In this manner the second digitstorage device is prepared for registering the second digit.
  • Uponenergizing relay 325 prepares a locking-circuit for itself at its armature 331, connects the grounded conductor 228 to the lamp conductor 335 at armature thereby displaying the No. 5 digit in the second digit bank of the lamp indicating device, and connects conductor 388 to conductor 265 atarmature 332.
  • the latter conductor extends to the lower bank of the sending switch 5 and terminates there in bank contact 295. lVhen the No. 5 digit key is released, ground is removed from conductor 235 and relay 325 becomes locked in series with relay over conductor 2S5.
  • Relay 303 is accordingly energized in series with rel 325 and at its armature'3l2 breaks the circuit of relays 30% and 305, whereupon these relays fall back and disconnect the digit relays 321-320, inclusive, from the conductors coming from the digit keys.
  • Relay 303 also grounds the holding conductor 223 at its armr-ture 3i 1, and at its a 'mature'310 rrounds the conductor 385 which extends to the third digit storage device, thereby J t" 1g a circuit for the relays, correspondi g to relays 30 land 305, which connect the ten digit relays of the third digit storage device with the conductors coming from the digit keys.
  • the No. 7 digit relay is en rgized over conductor 23?, and this relay causes the digit 7 to be displayed at the fourth digit bank of the lamp indicating device and also prepares a circuit for grounding conductor 2G7,which conductor terminates in bank contact 297 of the sending switch S.
  • the energized digit relay becomes locked in series with a relay, corresponding to relay 303, which is energized in order to ground the holding conductor 223 and also to break the circuit ot the relays which have previously been effective to connect the ten digit relays of he fourth digit storage device with the conductors coming from the digit keys.
  • the pilot amp L which is located in line with the digit-keys of the sender, uponwhich the nun'iber has justbeen registered, is also lighted inasmuch as it is connected with the grounded holding conduct-or 223. hen the hey it opu'ated by the B operator, which takes place immediately alter the operation of the various digit keys, the relay is energized over a circuit extending from ground on the holding conductor 223, springs of key K, and through the windingof relay 4-5 to battery.
  • Relay 45 upon energizing, at armature 5-il locks itself to grounded conductor 223, at armature 53 prepares the circuit of the relay id, at armature 52 prepares the circuit of relay 44;, and at armature 51 lights the calling lamp L
  • the function of the lamp indicating device upon which the digits are displayed as fast as they are registered. is to indicate completed telephone nun'ibers to the B operator with a View to affording her a check on the accuracy of her work. In order to obtain the best results and the maximum speed of operation is intended that the B operator will register the di 'its in the telephone numbers as they are transmitted to her by the A operator. from which it will be evidentthat the digit keys are necessarily operated with rest rapidity, and in quick succession.
  • a key may be inserted in the battery conductor inorder to disconnect the current supply from the lamp, and the key may then be operated whenever it is desired to show up some particular number.
  • relay 203 In case an inspection of the indicating device should show that a telephone number has been registered inaccurately, the release key It may be actuated in order to energize relay 203 for the purpose of re storing the digit relays of the severalstorage devices to normal position. The manner in which this is accomplished by the operation. of relay 203 will be clear from the subsequent explanation of the restoration of these relays under ordinary circumstances, consequently it will not be necessary to make an; detailed explanation of it at this time.
  • the B operator assigns a trunk to the A operator, as previously explained and need pay no further attention to the call. As soon as the A operator takes the trunk,
  • Conductors 221 and 222 are normally connected together at ari'nature 212 and also at armature 214 of relays 201 and 202 of the sending switch S, and it follows, therefore, that a circuit is completed over the trunk conductors 60 and 61 for the line relay 65 of the first selector D, Fig. 3.
  • relay 65 closes a circuit for the slow acting release relay (36.
  • the latter relay upon energizing, opens a point in the circuit of the release magnet 72 and prepares a circuit for the vertical magnet in the customary manner.
  • Relay 4% is operated when the circuit is closed through its upper winding and completes a locking circuit for itself at its armature 61.
  • relay a l closes a pair of contacts in the trunk conductors in order that when the relay 46 deenergizes, as will occur shortly, the said trunk line may extend continuously through the operators position.
  • lVhen relay 16 is energized, as just explained, the conductor 224 is grounded, being connected with conductor 223 atarma turc 58, and a circuit is completed for slow acting relay 20%, Fig 5,
  • relay 20 1 closes a circuit for slow acting relay 205 at its armature 217 and its armature 21 disconnects ground from the conductor 2 8. The latter. operation extinguishes the lights.
  • stepping magnet 206 ofthe sending switch S and this magnetis energized.
  • the circuit of the stepping magnet 206 is broken and the said magnet retracts its armature, thereby advancing the wipers 207 and 208 one step.
  • the wiper 207 now engages grounded contact in its associated bankand thereby closes a circuit for the slow acting relay 201 which ener izes and Jrepares a locking. circuit for slow acting relay 200.
  • Relay 201 also opens, at armature 212, the shunt circuitwhich normally renders theiinpulsingrelay 202 ineffective to interrupt the circuit-of the line relay of the selector D.
  • The; impulsing relay 202 continues to be energized and deenergized intermittently by the operation of the cam .298, and at each energization this relay will separate the two conductors 221 and.222 and will thereby produce a series of interruptions in the cir cuit of the line relay 65 of the selector D.
  • relay 202 transmitsa series ofimpulses to the stepping magnet 206 at armature 215, andthe sending switch S is thus driven synchronously with the first At the first energization relaythe firstselector.- After four interrupt-ions have been produced in this way, the stepping magnet 206 will have been energized four more times, and the wiper 208 will be advanced into engagement with the now grounded bank contact 294.
  • A- circuit is thus completed for theslow acting relay 200,-which immediately energizes, establishes a locking circuit for itself atits armature.
  • Relay 200 also closes a new circuit for thestepping magnet 206 at armature. 209-, and sincethis circuit includesan inter rupter contact controlled .by the stepping;
  • the said stepping magnet will operate in the manner of a buzzer and the.
  • wiper 208 will" the energization of relay 250 are the opening of the ground connection at armature 257 to the holding conductor 223 in the firstdig t storage, device (it will be recollected that this holding conductor is still grounded in each of the other three storage devices); the removal of ground from conductor 288, at armature 256, whereby ground is disconnected from bank; contact 29% in the bank of the. sending. switch S; andthe grounding.
  • relay now begins operating as before and on its first energization transmits an in'ipulse of current to the stepping magnet 206 with out, however interrupting the switch control circuit over the-trunk line, which now extends through to the second selector E.
  • wiper 207 arrives at the thirteenth bank contact and since this contact is grounded a circuit is completed for the slow acting relay 201. which operates to open the shunt circuit at its armature 212 as before.
  • Relay 200 also close the usual circuit for continuing the operation of the stepping magnet 206 and the sending switch is, therefore, continued in motion untilthe wiper 207, arrives at the next ungroundcd bank contact, which is the twenty-fifth.
  • rela 200 is energized
  • a circuit is completed by way of conductors 227 and 287 for relay 302 in the second digit storage device and the said relay 302 is energized.
  • this circuit is broken and relay 302 becomes locked in series with relay 301 to the, grounded conductor 285.
  • Relay 301 is accordingly energized and at its armature 306 disconnects conductor 28'? from the winding of relay 302 65 and transii'ers it byway of conductor 28?
  • relay 301 disconnects the grounded conductor 286 from conductor 388, thereby removing ground from the bank contact 295 in the bank or" the sendng i switch S, and transfers it into connection with conductor 886, whereby ground is extended by way of the new energised sixth digit relay in the third digit storage device, to bank contact 296 in the bank of the sending switch, and at armature 308 of relay 301 the ground connection to the holding conductor 223 in the second digit storage device is broken.
  • the second series of operations at the operators sending equipment resulted in the transmission of five impulses to the selector lfl, or rather in the production oi? live ruptions in the circuit of its linerelay 90, whereby the switch shaft and wipers are raised opposite the fifth level of bank contacts.
  • the second selector Upon the (:css tion of the series of impulses, the second selector it automatically operates to select an idle trunk leading to a connector switch, such as the connector ll, Fig. l.
  • relay 202 is incliective to interrupt the control circuit. It will be unnecessary to minutely consider all the operations which take place during the transmission of the third and fourth series of impulses.
  • the third series is terminated by the arrival of wiper 208 at grounded bank contact 206 which causes relay 200 to be energized, in order to advance the sending switch automatically to the twelfth contact in its bank, and which closes a circuit over coi'iductors 227, 287, and to the relay in the third digit storage device which corresponds to relay 382 of the second digit storage 'levice.
  • a relay in the third digit storage device corresponding to relay 301 of the second digit storage device, is cncrgized and various transfer oper ations take place which result in the removal of ground from bank contact 296 and in the grounding of bank contact 207.
  • the connector l'l responds to the third series of impulses, and its gha'l'tand wipers are raised five steps untilthey stand oppo site the fifth level of bank contacts. No automatic movement takes place atthe connector, however, upon the cessation of the series of impulses and further movementof the connector is deferred until the arrival of the next series of impulses.
  • conductor 227 is grounded, and a circuit is completed over said conductor and conductors 287 and 387 and thence by way of asiinilar conductor, in the third digit storage device, to a relay in the fourth digit storage device which corresponds to relay 302 of the second digitstorage device.
  • a transfer relay in the fourth digit storage device which corresponds to transfer relay 301 ofthe second digit stor age device, is energized.
  • the operators sending. equipment including the four digit storage devices and the. sending switch S, is .thus entirely restored to normal position and is ready for use again in registering another telephone number.
  • the control circuit of the first selector D includes the conductors 221 and 222 coming from the sending switch S. and the trunk conductors and 61, and when the first series of interruptions is produced in this circuit by the intermittent impulsing relay 202 of the said sending switch, the line relay of the first selector is caused to retract its armature a corresponding plurality of times.
  • relay 65 sends a current impulse through the slow acting series relay 67 and the vertical magnet 70 in series, and the vertical magnet is operated to raise the switch shaft step by step until the wipers 80,81, and 82 stand opposite the fourth level of bank contacts.
  • Relay 67 energized in series with the vertical magnet, and being slow acting retains its armature in operated position throughout the vertical movement of the switch.
  • the oil normal springs 78 are closed and since relay 67 is in operated position a circuit iscompleted for the stepping relay 68.
  • relay 68 Upon energizing, relay 68 establishes a locking circuit for itsel'i at its upper armature, and at its lower armature prepares a circuit for the rotary magnet 71.
  • the slow acting relay 67 is deenergized and closes the circuit of the rotary m net 71 which accordingly operates to rotat; the switch shaft one step and brings the switch wipers into engagement with the first set of bank contacts in the fourth level.
  • the rotary magnet opens its interrupter contact and thus breaks the locking circuit of the stepping relay 68, which. accordingly deenergizes and breaks the circuit of the rotary magnet which thereupon deenergizes also and again closes its ii'iterrupter contact.
  • the test wiper 81 will find no ground potential on the test contact 8i and the stepping relay 68 will not again be operated. Instead the switching relay 69, which has heretofore been short circuited, is energized in series with the stepping relay (58, the latter relay remaining inoperative due tothe high resistance of the said switching relay.
  • relay 69 Upon energizing, relay 69 grounds the test wiper 81 at its armature 75 in order to make the selected trunk line busy, and at its armatures 74 and 77 disconnects the trunk conductors 60 and 61 from the winding of the line relay and extends then by way of wipers 80 and 82, bank contacts 88 and 85, conductors 86 and 88, and armatures 94L and 96 and their resting contacts to the upper and lower windings of the line relay 90 of the second selector E.
  • the line relay 90 is energized and closes a Circuit for the slow acting release relay 9i.
  • relay 91 prepares the selector for operation in its vertical movement in the usual manner, and also connects ground to the release trunk conductor 87, thereby establishing a holding circuit which extends by way of said conductor 87, test contact 8 test wiper 81, armature 7 5 and its working contact, winding of the switching relay 69, interrupter contacts of the rotary magnet 71, oli normal springs 78, and the winding of the stepping relay 68 to battery.
  • trunk conductors 60 and 61 have been extended through to the second selector E have occurred in response to the transmission of the first series of impulses by the sending switch S.
  • the line relay 90 of the second selector E is deenergized a plurality of times and con trols the vertical magnet 92 to raise the shaft and wipers 102, inclusive, tothe fifth level, the second digit in the number being the digit 5, as explained heretofore.
  • the operation of the second selector E is precisely the same as that of the first selector E, and consequently it will be unnecessary to consider it in detail. It will. be sutiicient to say that at the end of the vertical move ment of the switch, the rotary movement is initiated automatically and the wipers are rotated step by step in search of an idle trunk line leading to a connector switch.
  • the line relay 111 is energized and completes a circuit for the slow acting release relay 112.
  • relay 112 prepares the connector for operation in its vertical move ment in the usual way and at armature connects ground to the release trunk conductor 107.
  • a holding circuit is thus established which extends by way of the said conductor 107, test contact 10 1, test wiper 101, and armature 95 and its working contact, to conductor 87 where it joins a previously described holding circuit extending back to the first selector D.
  • the switch ing relay 99 at the second sel ctor E is connected to the holding circuit the same as was described in the case or the switching relay (59 01 the first selector.
  • Belay 113 is energized in "series with the vertical magnet 118 and being slow acting holds up continuously during the vertical operation of the switch. By the operation of this relay, the ver'lcal magnet circuit is preserved intact, notwithstanding the shitting of the off normal springs, which occurs at the first vertical step of the switch. At the end of the vertical movement, relay 113 deenergizes and transfers the operating circuit to the rotary magnet 119.
  • the last series of impulses comprises seven interruptions in the control circuit corresponding to the final digit 7 ot the called telephone number. Responsive to these interruptions the line relay 111 is deenergized seven times and now sends impulses to the rotary magnet 119 over the "following circuit: from ground by way of armature 124: and its resting contact, armature 126 and its working contact, ofi" normal springs 121 and 122, armature 127 and its resting con tact, resting contact of armature 132, and the said armature, armature 139 and its restcontact, and the winding of the rotary magnet 119 to battery.
  • the wipers 1.50152, inclusive are rotated step by step and are finally brought to rest in engagenient with the particular set of bank contacts in which the line of substation A is terminated, these contacts being indicated in the drawings by reference characters 153, 154 and 155.
  • the slow acting relay 116 is energized in parallel with the rotary magnet and remains continuously energized during the rotary move ment.
  • relay 116 In operated position, relay 116 connects the test wiper 151 to the winding of the test relay 115 by means of its armature 133 and at armature 135 closes an alternative point in the circuit of the rotary magnet, to guard against the possibility of hav ing this circuit opened by the operation ot the test relay while the test wiper 151 is passing over grounded test contacts.
  • the switching relay 117 pulls up, it establishes a locking circuit for itself at armature 138, grounds thctest wiper 151 at armature 13?, opens the rotary magnet circuit at armature 139, and at armatures 136 and 140 connects up the two line wipers 150 and 152. the latter operation a signalling circuit is estab lished whereby ringing current from the genorator GEN is intermittently projected out over the called line to operate the bridged ringer at substation A, and notifv the called subscriber that he is wanted.
  • the return path for the ringing current includes the upper winding of the ring cut oil relay 114, and when the called subscriber answers this relay is operated.
  • relay 11 1 Upon energizing, relay 11 1 establishes a locking circuit for itself at its arn'iature 129, breaks the ringing circuit at armatures 128 and 130, and at the working contacts of these same armatures finally completes the talkingconnection.
  • This relay is a reversing relay and has the well known function of reversing the incoming trunk conductors 106 and 108 as regards their connections with the windings of the line relay 111. It will be recalled now that the circuit of the line relay 111 is completed by way of the bridge through the impedance coil 13, and the upper winding of the elechormal in the usual manner.
  • tro polarized relay 412 in the trunk equipment at the B operators position the operators sender having been disconnected by this time, and the operation of the reversing relay 110, therefore, will reverse the direction of current flow in the trunk line and more particularly in the bridge thereof which includes the upper winding of the said electropolarized relay 412.
  • the two windings of this relay now co-operate and it is able to attract its armature whereby the upper high resistance winding of relay 40 is shunted by means of the relatively low resistance impedance coil 41.
  • Relay 40 remains energized, owing to the fact that its lower winding is still connected in the bridge across conductors and 31, and the result of shunting out the upper high resistance Winding of this relay is to augment the flow of current sufliciently to operate the supervisory relay 7 at the operators cord circuit in the manual exchange. This serves to extinguish the supervisory lamp L and notifies the operator that the called subscriber in the automatic exchange has answered his telephone. The subscribers may now converse as desired.
  • the supervisory relay 8 is deenergized, and the supervisory lamp L is lighted.
  • the back bridge relay 110 in the connector H is deenergized and the direction of current flow in the section of the trunk to the right of the condensers is reversed to normal, thereby causing the electropolarized relay 12 to retract its armature.
  • the upper high resistance Winding of relay l0 is again included in the circuit of the supervisory relay 7 at the A opcrators cord circuit, and this relay is deenergized to light the su ')ervisory lamp L
  • the disconnect signals thus given the operator, she is advised that the con versation is finished and she will accordin, ly pull down the connection. lVhen the plug is removed from the jack J, the circuit over which relay 40 at the B operators position has been maintained energized, is broken and relay 410 will accordingly Iiiall back and remove ground from conductor 56.
  • relay -14 On deenergizing, relay opens the trunk line at armatures -19 and thereby clearing the bridge across the trunk conductors and 61.
  • the line and release relays 111 and 112 of: the connector H are permitted to fall back and these relays jointly close a circuit for the release nr .gnet 120, whereby the connector H is restored to Relay 112 also removes ground from the release trunk conductor 107 and this operation breaks the holding circuit for the switching relays (39 and 99 of the selectors D and E, respectively.
  • These relays are, therefore, deenergized and circuits are completed for release magnets 72 and 93 which operate to restore their associated switches to normal position. All the apparatus is thus returned to normal and is ready for use in setting up other connections.
  • the B operator does not necessarily have to operate the key K immediately after the operation of the digit keys and that she may do so after the trunk has been seized by the A operator. Under these conditions, the sending operations take place immediately upon the operation of the key K. However, the usual method of operation will be to actuate the key K immediately after the operation of the digit keys as this procedure saves considerable or the B operators time and minimizes the attention that the operator has to give to each connection.
  • ⁇ Vhat I claim is 1.
  • a and B operators positions trunk lines extending from the A operators position through the B operators position to automatic switches, other automatic switches, means for manually connecting a calling line with one of said trunk lines at said A operators position,
  • an operators sender including a registering device at said B operators position, means whereby the B operator can set up the called number on said registering device and prepare the sender for connection to the trunk line in use, means independent of further attention on the part of the B operator and responsive to the connection of said calling line with the selected trunk line for automatically connecting the sender to the trunk line in use, and means controlled by said registering device for causing said sender to send successive series of impulses over said trunk line to operate a series of said switches to extend a connection to a called line.
  • a and B operators positions trunk lines coming from the A operators position and passing through the B operators position to automatic switches, other automatic switches, means for manually connecting a calling line with one or" said trunk lines at the A operators position, an operators sender at the B position comprising a sending switch and a plurality of storage devices, means whereby the B operator can register the digits in the number of the called line on said devices and prepare the sender for connection to the trunk line in use, automatic means independent of further attention on the part of the B operator and responsive to the manual connection of the said calling line with the selected trunk line for connecting the sender with the said trunk line, means also responsive to such manual connection whereby the sending switch is then controlled by said storage devices successively to transmit series of impulses over the trunk conductors to operate a series of said switches to connect with the called line, and means for automatically disconnecting the sender when the connection is completed.
  • a and B operators positions trunk lines coming from the A operators position and passing through the B operators position to automatic switches, other automatic switches, means for manually connecting a calling line with one of said trunk lines at the A operators position, an operators sender at the B position comprising a sending switch and a plurality of storage devices, means whereby the B operator can register the digits in the number of the called line on said devices, automatic means responsive to the manual connection of the said calling line with the selected trunk line and to a previously completed momentary operation on the part of the B operator for connecting the sender with the said trunk line, means whereby the sending switch is then controlled by said storage devices successively to transmit series of impulses over the trunk conductors to operate a series 01 said switches to connect with the called line, and
  • a and B operators positions In a telephone system, A and B operators positions, trunk lines coming from the A operators position and passing through the B operators position to automatic switches, other automatic switches, a call circuit extending between said positions whereby the A operator can transmit a desired called number to the B operator, an operators sender at the B position comprising a sending switch and a plurality-of storage devices, means whereby the B operator can register the digits in the called number on said devices, manual means at the A operators position for connecting a calling line with aparticular one of said trunk lines assigned by the B operator over said call circuit, automatic means responsive to the seizing of said trunk for connecting said sender with the trunk line assigned independent of any contemporaneous or subsequent operation on the part of the B oper ator, and means also responsive to the seizure of said trunk for then automatically operating said sending switch under the control 01" said storage devices to transmit a plurality of series of impulses over the trunk conductors to operate a series of said switches to complete the connection to the called line.
  • a and B operators positions, trunk lines coming from the A operators position and passing through the B operators position to automatic switches, other automatic switches, a call circuit extending between said positions whereby the A operator can transmit a desired called number to the B operator, an operators sender at the B position compri ing a sending switch and a plurality of storage devices, means whereby the B operator can register the digits in the called number on said devices, manual means at the A operators position for connecting a calling line with a particular one of said trunk lines assigned by the B operator over said call circuit, automatic means responsive to the seizing of said trunk line and to a previously completed operation of relatively short duration on the part of the B operator for connecting said sender with the trunk line assigned, and means for then automatically operating said sending switch under the control of said storage devices to transmit a plurality of series of impulses over the trunk conductors to operate a series of said switches to complete the connection ators sender at the B position comprising a sending switch and 'a plurality of storage devices, means whereby the B operator
  • a and B operators positions trunk lines extending from the A operators position through the B operators position to automatic switches, other automatic switches, means for manually connecting a calling line with one of said trunk lines at said A operators position, an operators sender including a registering device at said B operators position, means whereby the B operator can set up the called number on said registering device and prepare the sender for operation by performing an act of relatively short duration, means responsive to the subsequent connection of the calling line with the selected trunk line for initiating the operation of said sender, and means for automatically continuing the operation of said sender under control of said registering device to send successive series of impulses over said trunk line to operate a series of said switches to extend a connection to a called line.
  • a sending device at the second switchboard means "for transmitting a telephone number to the operator at the second switchboard, means under the control of said operator for adjusting said device in accordance with said number and for p-eparing to start the sender to retransmit the registered number over said trunk line, means at the first switchboard tor subsequently completing a connect-ion to the line thereat, and means for starting said device responsive jointly to the said completion of the connection at the first switchboard and to said preparation and without further attention from the operator at the second switchboard.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Structure Of Telephone Exchanges (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)
US1615998D 1921-02-09 nelson Expired - Lifetime US1615998A (en)

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US175260XA 1921-02-09 1921-02-09

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FR (2) FR543550A (enrdf_load_stackoverflow)
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US2749535A (en) * 1951-11-23 1956-06-05 Westinghouse Electric Corp Telemetering systems

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US1614678A (en) 1927-01-18
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FR543550A (fr) 1922-09-05
USRE17632E (en) 1930-04-01

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