SU2591A1 - Automatic telephone switch - Google Patents

Description

The action of the scheme of the invention is based on the property of the differential relay D. R. Relay, with different currents in direction and magnitude, flowing through its winding, pulling its own measles, closes the contact, but with equal currents. rank, but different in the direction of the currents, leave measles, opens the contact.

FIG. 1-6 illustrate its structure and effect.

An MS store of resistances (Fig. 1) with ten contacts O, 7, 2 ... 8, 9 is included in the scheme of an ordinary apparatus. By moving the slider to the contacts and pressing the K button, the subscriber has the ability to include 10 different resistances. The conversational circuit of the subscriber unit is turned off at this time. At the station, the subscriber receives a plus battery through the first half of the differential relay D. P-I, and a minus battery through the relay P- /.

The current paths are indicated on the figures by separate chains, the chains are numbered and the chain number is indicated in the description. The letter designations are made in Russian alphabets, with, for the most part, the first letters of the part are supplied: L /. S.-shops of resistance, M. D. K.-magnet-driving coil, I-finder, P-1, P - // - first relay, second relay, etc. The current passage of the rest position is conventionally indicated in FIG. 1, chain 1-. It should be read as follows: plus battery, first winding of differential relay D.P.I, wire b, bell, capacitor, first contact of button KI, wire a, relay P- /, minus battery. Consequently, only alternating ring currents can pass through this circuit.

When calling subscriber H of subscriber jY 1, subscriber H sets the drag store slider to contact No. 1 and presses the K button. As a result, a calling circuit for No. 1 is created (Fig. 1, circuit 2-). Relay D. P- / acts and closes the contact e, which includes the magneto-moving coil M. D. K. seeker I. The seeker has three rings and three contact FIELDS-, 2, 3. Rings with field contacts can have a message through its own sliders A, B and B. The resistor store is included in the first contact field of the searcher, almost the same as that of the subscriber. The other two fields of the seeker are intended for o-7 and b-7 multi-drop wires of subscribers No. O, 1, 2. 3 ... 9. Close the contact with-through the coil / s /. DK creates a circuit (Fig. 1: 3- circuit), Magneto - a moving coil .W, DK, P. B. - current breaker sets in motion all three seeker finder I. Seeker And, as soon as he moves from the spot, in its first icoHj-act field, creates a circuit (fig, 1, circuit 4-). When the searcher I comes to contacts 7, "-7, b-7, the currents in both halves of the differential relay D. R.-7-2 are equalized, since the circuits will have almost the same resistance, and the measles will be the relay D. R. 7 -2 disappears, turning off the contact with. An open contact will turn off the drive coil / W. DK and the searcher will stop at contacts J, a-7, b-7. If now relay PI, through some additional device, was connected to a contact and, 1ac, so that the latter, when the two subscribers were connected, turned off, then subscriber H, off-hook and off button K, 4pell According to this scheme, it is connected with one of the remaining 1x9 subscribers, in this case, 1, Calling and breaking devices are not given in this scheme, since this is only a scheme characterizing the principle of operation and it is designed only for 10 numbers.

The hundred-hundred scheme differs from the above steps only and the introduction of some additional devices and circuits, which make it possible to reduce the number of devices by 100 subscribers, make the most transition from stage to stage and signaling for the case of a call, and also for cancellation. From the already mentioned part of the range of manipulations both at the subscriber and at the station, the necessary mechanical selection is required of the desired subscriber number. Further

described in order of sequence: / - subscriber's device and its operation, // - station scheme for 100 numbers. The manipulations are reduced to the following: a) selection of a free connecting line, b) selection of the desired tens for a given resistance (I stage of search), c) selection of a line in tens of for a given resistance (II stage of searching), d) call numbers busy and free, e) a conversation circuit and e) hang up.

1. The subscriber's device and its action.

The diagram of the telephone set of the automatic switch for 100 numbers is shown in FIG. 2. Line wires a and b divide the circuit into two parts. The left part of the scheme differs from the scheme of the apparatus of the Moscow Telephone Station only the introduction. M of additional throttle resistance D. S. in 1500 ohms and that. That the wire is connected through the contact / positional disk P. D. The right part of the circuit (device circuit) allows mechanical selection of the desired subscriber number. The device consists of a resistance box with ten sections on a common core and ten ontact plates-O, 1, 2, 3, ... 9. Two tires are placed above the contact plates (for a hundred-meter system; for a thousand-meter system, three times ): D-for dec; L-dl line in ten; L - / - their side view. Tires with plate. They can have an electrical connection only through the sliders c) and l. A resistance store, like an electro-magnet, can act on measles I, which translates when the spring drops off the crawler of the P. P. D. position disk from contact to contact. The contact field of the position disk has 4 independent circuits, and the 5th contact represents the repetition of the 1st contact. The position disk (cro, me cor) can be rotated with the button). The button to and the measles I are mechanically unrelated and can act independently: when the koros are working, the buttons to remain at rest; when the button is pressed, measles by its spring, falling away, transfers the position disk to the next contact. Contact About

and o- / connected to each other and operate from a handset. The rest position with a hanging tube will be (Fig. 2) -chain 1-. Only alternating ring currents can be passed through the bell. If a subscriber was called, he would remove the power of the microphone through the additional resistance of D.S., which is so significant that the subscriber's call relays at the station do not work and the call from his side does not occur, the same circuit will be received. The power of the microphone will occur through D.S. (Fig. 2) -chain 2-; conversational currents will pass through a capacitor, telephone, contacts on the lever and a microphone (Fig. 2) -chain 3-. Thus, the subscriber has the full opportunity to create a reciprocal conversational circuit in his / her device. If the subscriber himself wishes to call any number, he must anticipate it (the receiver: b) to pick up in his resistivity shop and bring the calling devices to motion at the station. This is done as follows: the desired ten current is dialed on the bus D with the slide d, mobile on the corresponding number contact plate. The line in the ten is dialed on the bus L crawler l by moving it to its corresponding contact plate. In Fig. 2, you dial number 27. Sn in the handset, pressing the k key and lowering it the subscriber thereby The O- / contact contacts and the position-disk crawler moves to the second position, i.e., to the 2nd contact. This transfer replaces the D.S. resistance in 1500 ohm with the resistance in 100 ohm (Fig. 2, circuit 4 -). The amplified current in the subscriber's line drives its linear relay at the station; this relay switches on the preliminary search for a free connecting line. Linear current through the 100 ohm of the subscriber's resistance box, attracts measles I in the subscriber's office, prepared it for the next advancement position disk sliders, h To withdraw it, move it to the 3rd contact. how

only the preliminary finder of the free connecting line will find a free line, it (line) now (for the time) bypasses the subscriber's line, causing the core of the subscriber’s resistance box to lose power, and its measles disappears. The subscriber's position disc, therefore, will move to the third position. Turning on the co-line, which automatically shunts off after a while, will power the subscriber’s line and its core of the resistance shop through a resistance corresponding to the 2nd ten. (Fig. 2, chain 5-). Under the action of this current, the subscriber measles is again drawn and is prepared to further advance the position disk to the 4th position. At the station at this time there will be a search for a ten for the corresponding resistance in the searcher. As soon as the search for the ten is completed, the connecting line will again bypass the subscriber's line. The subscriber's position disk will move again (to the 4th position). At the same station. through the auxiliary device, the search will switch to AND stage. The line, which was straightened from the newly connected line, will again feed the subscriber's line and its core of the resistance box, but already through the resistance corresponding to the 7th line in ten (circuit 6-). Under the action of this current, the subscriber’s measles is again drawn, and at the station the 7th line in ten will be searched for the corresponding resistance in the searcher. When the search for the 7th line is completed, the connecting line will again clamp the subscriber's line. The position disk under the action of the falling out core goes to the last fifth position, which represents the repetition of the initial position, i.e. The resistive mag is disconnected, and the conversational circuit of the subscriber unit is switched on, circuit 2- for powering the microphone and circuit 3- for conversational toxv. At the station at this time, if the X 27 subscriber is busy, the relay will work more slowly, which will turn off the bypass and send towards the subscriber

l 31. which caused, the buzzer beep "busy. If the subscriber number 27 is free, then another relay will work and give a call signal (ringing) to the side of the JVs 27 subscriber. When subscriber No. 27 picks up the handset, the ringing circuit is turned off and the conversation is closed. The conversation may thus be composed. When hanging tubes at the subscribers, at the station there will be a release. Consequently, the work of the subscriber and his device is as follows: 1) if the subscriber answers the call, it is enough to pick up the phone and the conversation is made; 2) if the subscriber himself wants to call, he must dial the desired number with the slider. pick up the phone and press the and button. The button transfers the position disk of the device to the 2nd position, finds a free connecting line, transfers the subscriber's position disk to the third position at the station, found ten places the position disk to the fourth position, found line 7- in ten places the position disk (5th or 1st - all the same). In further manipulations, the device does not participate until it receives a signal "busy or free". During a conversation, only the conversational circuits are turned on, and when they are off, they are turned off. In the further descriptions of the circuit, the complete circuit of the apparatus is not given, but the subscriber’s subscription with its transitional corresponding positions is conventionally indicated: 1 position - a quiescent circuit and a spoken circuit. 2 position - the search for a free connecting line, 3 position - the search for the first stage (ten), 4 position - the study of the second stage (line in ten) and 5 position - 1 position.

Ii. The scheme of the station and its operation.

a) Selection of a free connecting line (Fig. 3). Each subscriber JN 31 has at the station: two relays - P - / and P-II, power throttle Dr.-300 ohm. three wires in the multi-field field n - 1, b - /, g - JN 31 and the preliminary finder of the free connecting line P. I., rotating by means of the magnetically moving coil / V /. DK The pre-searcher's rings are connected to the contact plates of the relay P - //, and on the slider O, the searcher can slide on the rings 1, 2, 3 4 and on the cord corresponding contacts 1, 2, 3 and 4 cords: 1st , 2nd, 3rd, 4th, 5th, etc. Each connecting line (cord) starts with a cord relay P-III, has a differential relay P-IV and five wires a, b, d , d and e. The wires a and b serve for the conversational circuit; d wire - for powering the sub relays involved in further manipulation; wire () - for the secondary winding of the differential relay P - / V, this wire includes an additional bifillary resistance of 320 ohms and includes, then, resistors of seekers of the 1 st and 2 nd stages; The wire e controls the movement of the I and II stage seekers, depending on the effect of the differential relay P-IV. All cords (connecting lines) are independent and four m wires are connected in parallel to the contact fields of the preliminary finders. When the position is quiescent and when the subscriber answers, the call from the station (via multi-wire wires. A- / and b-I) - the nutritional circuit of subscriber 31 will be the same (Fig. 3, circuit 1-). When the tube is suspended, the circuit of the disconnected capacitors in the subscriber unit, and when the tube is removed and the subscriber circuit is disconnected from the microtelefine, the current passing through the 100-ohm coil of the P-I relay will not be sufficient to activate the P- /. Therefore, the subscriber will be powered, the talk currents will pass through the wires B-61 and a - “/, but the station in its calling devices will remain at rest (from the subscriber jV 31). When subscriber 31 will call himself and press the button to, the additional resistance D. S. at 1500 ohm will change to resistance at 100 OL1, and the current in the relay P- / amplifies. It will work and close the chains: 2nd, 3rd and 4th (Fig. 3). The second chain has two branches. One branch. goes to the field

and gives a signal “to do it if any subscriber will call to number 31.. Another branch goes to a common starting relay and-O. The P.R. Starting relay switches on the motor, by means of which the following currents are produced at the station: pulsing - to advance the searchers; variable - for ringing calls; buzzer current - for the signal “is busy. In the diagrams, pulsating, alternating and buzzer currents are taken from the common corresponding buses, without indicating the method of their production. The third circuit includes the magneto-moving coil MDKK of the preliminary searcher of the free connecting line, i.e. drives it. For the sake of clarity, the contact from which the circuit is closed is crossed out with a dash in the figures, in this case it will be the contact plates / 4 P- /. Fourth chain - seeks. The moving finder slides the slider on the fourth ring and on the fourth pins of its gender. Three other sliders, although they also slid over their contact fields, but their circuits in the relay are open, and therefore they will have no effect whatsoever. As soon as the seeker slider 04 finds the fourth contact with the battery minus, and this is possible, only if the corresponding connecting line is free, then the relay P - // will work. The following will happen: the circuit 3-, in the contacts s P - //, is broken, therefore, the further advance of the seeker stops; circuit 4- switches in contacts P - // s - / j on / h, the search circuit being turned off, and relay P - // receives directly the battery minus; circuit 5- is turned on, which helps to keep the P- / relay in working position and causes the P-/// relay to operate; The subscriber receives power from the corded connector. The result is: the previous power supply is turned off via a 300 ohm choke, and a battery plus (point on the bus X), a P-IV-200 ohm relay is turned off, the second finder contact in the 5th cord, its second ring (the seeker's slider is supposed to have stopped at

5 cord), contact plates i, P - //, transportation O; reverse feed currents will pass. the former way, i.e. wire b, 100 ohm relay P- /, minus battery. The talk currents will pass along the newly created circuit: wire b, contact plates / i, P-II, ring, /, contact of the 5th cord /, wire b, etc., along the connecting line. The second wire of the speaking circuit and is parallel to the wire b. The relay P - /// will work: will close the contact plates / 4 P - /// IT will give power to the wire g; will open the contact plates / 1 P - ///, pm. it will deprive this connecting line in the fields of the battery minus searchers and, thus, will not give the opportunity to stop another searcher on this connecting line. This is where the search for a free connecting line ends.

b) Search for the desired ten (Fig. 4). Shnurova is connected to a line in 1 step of searching, and. She has: a finder of ten I.D. and two cord relays Р-V and Р-VI. Ten seeker has: two rings; 2 contact floors to them; two sliders M and H; head contact GK from four plates; The magneto-moving coil J. DK. The resistor shop is included in the first seeker contact field. The I.D. searcher has a resting position and then the ring / with a resistance box, through the M slider, does not have a message, the head contact plates are, in this case, in the following positions: 7 and 2 are closed, 3 and 4 are open. The second contact field includes wires leading to the magneto-moving coils of the linear finders. FIG. 4 marked: wire F-common and wire f - the 2nd dec. The search for the desired ten actually is the closure of the wire F - Society. with one of 10 wires f. Since, for example, JNs 27 is taken, and the closure will occur at the position as indicated in FIG. 4, the dotted line, that is, the M and H sliders will stand at the contacts 2 corresponding to the second ten. FIG. 4. on the left side of it, dashed line. Separately: the sectional image of the previous circuits from FIG. 3. Turning on the connecting line to the line of the subscriber No. 31 with head contact plates shunts the line of the subscriber No. 31 (Fig. 4, chain 1-). The result is: the station relay P- / remains in the working position and even receives enhanced power; the subscriber has measles in the resistance shop, out of date, translates the position disk from 2 position to 3; at the station, the differential relay P-IV closes the circuit with the second Ya. D. chain, that is, gives power to the drive. Under the action of this current, the relay R-K will operate and turn on the 3rd circuit. Turning on the magneto-moving coil M. DK will lead the searcher. The touched seeker will produce from a resting position; will switch the head contact plates z-open. 4 - closes; the slider / V will turn on the resistor search box in the second winding of the differential relay P-IV (circuit 4-, fig. 4). When the G and I sliders come to the contacts 2 of the second decade, the currents in the differential relay equalize, the IJ measles will disappear and the wire will lose power. The P-V relay will disappear, so the drive coil / W pulsing circuit is turned off. D.K., i.e. seeker movement will stop; the contact plates / a P-V are closed and the relay P-VI is turned on (circuit 5-). Relay P - VI - Toggle. It gives you the opportunity to go to stage II of the search: the bottom of the relay switches these wires, the wire b - continues. The wires are a and (pass directly to the second stage, with p.m., the connection r continues only after the searcher of the ten I. and D. D. is moved from the rest position.

c) Search for the desired line in the top ten (Fig. 5). The second stage of search consists of 10 linear finders and two relays P - VII and P - VIII. But since the second search is immediately followed by a number of manipulations, this also includes two relays for the test for “busy: P-IX and P-X. two relays for calling the P-XII and P-XIII free numbers, and the P-XI bumper relay. From 10 linear finders

only one is involved in the choice of line, i.e. only one which was defined in the previous search, in this case, it will be the second linear finder 2 L. I., corresponding to the second ten of the centenary multi-field, divided into tens. Each linear finder has 4 circular rings with its own contact fields, a magnetically moving coil, M. DK, and a head contact of 6 plates. Each ring is communicated with its contact field. The field occurs through the sliders D B, B, G. The plates of the head contacts are connected as follows:,. and, -, - in Bgeh, the linear searchers of this connecting line are connected in parallel and in the quiescent position are disconnected; the plates 4 are turned on in series and in the quiescent position are closed and shunt the connecting line. In the first contact field of the seeker is included. Shop soproti; .tn., exactly the same. as in the first stage of the seeker. This store of resistance is common to all 10 linear finders. The second contact field of the suit-1el includes multi-wire wires of the corresponding ten subscribers according to their serial number in the ten. The third and fourth contact fields include .multiply wires a- / / and b- / corresponding subscribers. As soon as the search in stage I is over and the switching relay P-VI is triggered, the connecting line again initiates the subscriber's line through a train of head contact plates of the linear finders (Fig. 5. circuit 1-). Consequently, the resistance in the subscriber unit will change, since the position disk will move from the /// position to IV, and the resistance defining the choice of the 7th line in the decade will now be turned on (at the subscriber). At the station, relay Р-IV will work and will give power to the wire from (circuit 2-). Under the action of this current, relay P-VII will operate and turn on the magnetically-moving coil of the second linear finder (circuit 3-). The second linear finder with the -4 head contact plates (as soon as it moves from the rest position) turns off the connecting line shunt and turns on its resistance box with slider A into the second half of the differential relay P-IV, through wire () (circuit 4-). Once the currents in P-IV are almost equal. And this will happen when the seeker's crawler is located on pins 7, its Ya. D. measles will disappear and the wire disappears (the power supply is lost again. Then the P-VII relay disappears and the P-VIU relay turns on (circuit 5-). Relay P- VIII the wires d and e are left in the second stage of the search in the cliff and in further connections. These wires of fate are not to be taken. At this end the search for stage P. ends. The following manipulations must show whether this number is free, and, if free, call subscriber number 27.

d) Subscriber L 27 "is engaged (Fig. 5). Wires o and 6 pass through relays P- / X and P-X, with it. in Р-X they are connected for a short time through the contact plates 7 and 4. When the relay Р-VII worked and released again, as it was just in the second stage of search, the subscriber line received a shunt again (circuit 6-). The subscriber's position disc, under the action of this shunt, will move to the last position 5th, in which the resistance box is turned off and the microphone circuit is turned on. At the station, the linear finder stopped at 7 contacts (in the second contact field), the wire voltage –z 27 transmits to one of the windings of the relay P-IX, since if the subscriber L - 27 is busy, then his wire has plus battery . In the second winding of this relay, the voltage (plus battery) is provided by the wire of the city. The search for stage II ended with that. that attracted relay P-V ///. The relay P-VIII by closing its plates / „, will give the minus of the battery to both windings of the relay Р-IX. These windings are counter-current and with the same resistance, so in this case, relay P-IX will remain at rest (circuit 7-). Through its contact plates / S P-JX, the delayed relay P - X will operate (circuit 8-). which will turn off the shunt of the connecting line, and will turn on the buzzer current towards the subscriber 31, giving a “busy” signal (circuit 9-). The periodic signal "will continue until the subscriber No. 31 hangs up the phone, i.e. until the release. Subscriber JN 27 and talking with him at this time will not notice any extraneous phenomena, since the connecting line has not yet been switched on to their conversational circuit.

e) Subscriber D 27 is free. If subscriber 27 is free at the moment of selection, then his wire; will be without voltage (open circuit) and the current through the first winding of the relay P- / X will not go. Under the action of the current in oneG | the second winding of the relay P- / X will work. The following will happen: the wires a and b lose the shunt and are included in the talk circuit; The wire is connected to a voltage of -3 to De 27, so that no one will turn on this number anymore (circuit 10-); The bell relay P-X // turns on (circuit 11-). The bell relay closes the conversational circuit and includes a bell (circuit 12-) in the direction of the subscriber No. 27. The periodic call will continue until the Le 27 subscriber answers the call. Then the reverse (nutrient) current of subscriber L 27 in its wire b at the station will be split in half and go: through 100 ohm of the linear relay P - /; through 100 ohm relay P - X /// (circuit 13-). The P-HS relay will turn off the P-XII beeper, and thereby close the conversational circuit. The conversation can be held. A schematic diagram of the conversational circuit is shown in FIG. 6,

e) Hang up. The end of call will happen as soon as the subscriber L 31 hangs up, then the choke coil of its linear relay P- / will lose power (Fig. 3). as the subscriber line will be in the cliff. The second coil of the relay РI, also 100 ohm, is connected in series with the 1000 ohm coil of the relay Р - /// and not in the state one to keep in the working position the relay core Р- /. Therefore, the measles relay P- / will disappear and break all its contacts. Contact plates Uz P- /

they will deprive the food of the 1000-ps coil - P, //, so that its measles will also disappear, i.e. the connecting line is disconnected from the L 31 subscriber. The preliminary position finder does not have a quiescent position; only the first and first stage searchers have it. Therefore, with the resulting reboot, the preliminary searcher remains on the same pins of the connecting line. Open contact plates / t P - // raz.b: cabin the circuit of 1000 ohm-kunisi Р-nij relay, which, having opened the contact plates with its core, will deprive the power supply of the wire of the city. All relays that were powered by this wire released their cor; P - Vi-m of FIG. four; PK /// - in FIG. five; P-IX in FIG. 5. The fallen-out relay P-VI (Fig. 4) in 1 step search by contact plates °; - P-VI closes the circuit: common bus plus battery (point I on it), the second winding of the differential relay P-IV, wire d , contacts / P-VIj first ring seeker I.D., crawl a M, resistance of the shop seeker from 2 to O and minus the battery. The relay Р-IV with its second winding 200 ohm dt no measles Ya. D., i.e. it will work the same way as if the selection of ten is made, and in the first half of the relay P-IV there will be no current. The searcher will move to the quiescent position, as under the action of the current in the wire, the Р-V relay will work again and turn on the magnetically-moving coil L1. D.K. Iskatel I.D. through closed contacts% RV. The movement will continue until the slider L / comes off contact o to idle contact, i.e. Ioka the seeker will not rest. Then the second cover of the P-IV relay will also lose power, the wire e too, and the P-V relay will disappear. In the second stage of the quest, the same thing happens in principle, the following will be installed (Fig. 4): the wire (g - and stage) will receive power not from the differential relay, but from the P-XI burglary relay through closed contact plates / 9 P - VI . The following summary is made of FIG. 5. Released relay P-VIII contact

Plate.mi% P-VII closes the circuit: common bus plus batteries (point on it HP), relay coil P - XI in 1500 ohm. a dashed line through the second linear finder, contact plates; ,, Р-VI they will be closed, and the following / s Р-VI и; з Р-VI on wire e are open, wire (d - I steps), contacts V Р-VIII , the first seeker ring 2 L. I., crawler A, resistance of the seeker's store from pin 7 to pin o, and minus of the battery. The breakout relay P-XI will work and will: supply power to the general starting relay, circuit (bus plus batteries T. XII), contacts 1 / .. P-XI, common start relay (K. O. P. R.); power to the wire (e-II stage) at the point y, the circuit (bus, plus TTSpenpen t. HP), contacts V-; P-XI, point y, i.e. the P-VII relay will work again and close the pulsing breakaway circuit: a wedge plus batteries (T. / V). contacts / s G. K., the magnetodvigate coil of the seeker M. D. K. and the minus of the battery. The finder motion will continue until the circuit is turned off at the finder resistance box, i.e. until he is at idle contact position of rest. Then the P-XI burglar relay in 1500 ohm will disappear and turn off the P-VII relay and the general starting one. If for some reason the release does not happen. then to the subscriber L 27 all the time will receive periodic calls of the call. Despite this, the L 27 subscriber is fully able to dial the service number of the station, call it and claim damage number 31. This is described as follows. When subscriber 27 dials the desired number in his shop and presses the K button, its linear relay P- / will operate. A free connection line will be selected. This connecting line will trigger the relay P - // subscriber No. 27. Relay P - // will leave its multi-wire a- / and b- / in the cliff, and will turn on to the connecting line. Since the JV 31 subscriber was included in No. 27 in his multi-wire wires, now M 27 will be disconnected from the number 31. Subsequent selection by the subscriber

) about the 27th required by EM. But the measure will occur in a normal way.

The search for the desired number is carried out by the decimal system. The choice of each digit of the number, regardless of the search level, is based on the action of the differential relay in certain gradations of different current strengths: i.e. each gradation, two opposite in direction, but almost equal in magnitude, currents corresponds to a certain position of the searcher. These gradations of the forces of the currents of a certain (absolute) value do not have, but may have some deviation in the direction of decrease, depending on the change in the resistance of the subscriber’s line, for example, at 100 ohm. If it is assumed that some subscribers should have a line greater than 100 ohm, then additional resistance should be included in the station finder circuit or in the first search stage of the connecting line, for example, 50, 100, 150, etc. OL1. The selection of the required number is determined by pre-dialing in the resistance box for 1 winding a differential relay of a series of circuits, which may enable one to obtain a series of currents of a certain value in a certain order. This set of circuits can be implemented and, as described by the scheme, at the subscriber, and at the station. In the second case, the subscriber must have a telephone device of the type, for example, Strougere, and at the station an additional device, such as a register, which, receiving current pulses from the subscriber, would convert them into corresponding resistances. Since the invention relates exclusively to the station part of the circuit, and the station part in its main details is the same in both cases, a simplified diagram is presented in the description with the apparatus of the resistance store for subscribers. The search process itself is carried out by special seekers; the resistance box is included in one of the contact fields and is intended to select the appropriate current in the second half of the differential relay controlling the motion of the finder. The motion of the searchers is controlled as follows: the free connecting line in the first winding of its differential relay has a definition (and, consequently, a certain amperage) specified by the subscriber, the first-stage seeker in motion through its resistance box, in the second winding of the differential relay also creates current and moreover, with each passable contactor, it all increases, as soon as the currents in the differential relay coincide according to the gradation, the differential relay releases its measles and stops further seeker movement I stage. Auxiliary relays at this time will do the following: they will bypass the resistance coil of the first winding of the differential relay and switch the second winding of the differential relay to stage II of the search. In the second stage of the search, the same is repeated, that is, the affected stage II finder will turn off the shunt from the first winding, and the differential relay will power the second winding with amplifying currents. Since, under the action of a shunt, the resistance in the resistance box for the first winding of the differential relay automatically changes, then a search in stage II will occur in accordance with this changed resistance. The talking circuit is created by the parallel movement of the talk chain's sliders.

SUBJECT OF THE PATENT.

An automatic telephone switchboard, characterized by the use of a differential relay relay, which controls the movement of the first and second-stage searchers and two resistance stores, the resistance of one of which, included in the contact field of the first and second-stage searchers, is intended to be turned on in time. the selection process in one of the windings of the relay D. R., and the resistances of the second magazine are intended to be included in the other winding of the relay by the calling subscriber

according to resistance, iri | the contact of the called subscriber (FIG. 1 to his own called subscriber, 1, 2, 3, 4, 5, 6).

in order to equalize the currents in both windings of the relay, release its measles and stop the searcher on

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- „- at

-., - C

 R-1 P.I.

5 | a 0-s 2/5

P-IV N-IOLM

R-1 W-SHO.

r.ts ai. P-VI P-VII

% M 5 / / 5

N31

FIG. 6

MSH

5 S-eOv:

IX F

sFT / T r rT ITpT

a - tt-i 1 tt-i et;

Dr.I-zool.

R-HIH-Sha. Msh

; #I

Shpi