DE685092C - Circuit arrangement for telephone systems with dialer operation and several exchanges in series - Google Patents

Description

Circuit arrangement for telephone systems with dialer operation and several in-line exchanges The invention relates to telephone systems with voter operation and several exchanges in series, between connecting lines accessible to their calling connection points via preselector switches run over which these connection points a construction of a desired Reach the connection establishing point from which. by sending backwards of power surges via the connecting lines used for the call Voters can be influenced to establish a desired connection.

Its purpose is to be indifferent in these systems when establishing a connection whether one or more connecting lines between the individual exchanges run, the connection lines occupied during the call, as far as they are in the desired Direction are to be used to establish the desired connection.

In this regard, arrangements are already known in which at Dialing the code number of the connection line seized for the call by the setup switching devices become effective at the desired connection establishing point, which a connection in the selector after its setting according to the code number the line seized for the call or any setting of the same when marked of the connection line seized for the call and a switch back of the Connection path via the call finder set on the connection line when the call is made bring about. These arrangements require a considerable amount of special switching equipment, since the normal .. mode of operation of the selector has been changed and a @ switch back to the call finder set for the call must be made.

Furthermore, arrangements have become known in which the switch back after the voter has been switched off is avoided by using the code number the line seized for the call is set to the connection line seized for the call is controlled. For this purpose, however, switching devices are again to a considerable extent expended, which in the test circuit of the connecting line switchings such make that the connection line occupied by the call finder for the associated Line selector free and the other lines appear busy, but for others Line selector the line seized for the call is marked as busy.

In addition, arrangements have been proposed in which an adjustment the dialer on the connection line seized for the call when dialing back into the calling one Unteramtsgruppe is made possible by the fact that each connecting line is connected to two contacts connected to the voter contact bank. These are in the voice contact bank two contacts are connected to one another, while one contact is in the test contact bank with a corresponding contact in the contact bank of the preselection: wired switchgear and the usual test wire to the other contact to determine the occupied state connected. If it is a dial-back connection, it is shut down of the dialer on the line seized for the call via the first contact of the test contact bank depending on the immediate identification by the preselection switch, while the shutdown of the voter is dependent on the establishment of other connections from the usual test procedure on a free line of the marked traffic direction he follows.

The present invention takes a different approach to without switching back on the pre-selection device, the connection line occupied during the call for the establishment of dial-back connections. You achieve this by influencing the voter by power surges, which the code number of when calling from the upstream Exchange from laid connecting line correspond to switching devices take effect, which is a setting of auxiliary dialers that can be switched into the speech path to the connection line occupied by the upstream exchange according to the identification made by the preselection switch set during the call let go.

;. "In Figs. I and 2 is an embodiment of the invention shown.

FIG. I shows a semi-automatic telephone system selected to illustrate the concept of the invention, consisting of the three sub-offices Ui, U2 and U3 and a main patent HA. The sub-offices U1 and U3 are in series with the sub-office U2 and use this to reach the main patent HA, in which an officer sits who mediates the communication between the participants in the individual sub-offices. Instead of a civil servant, a memory device can also be arranged in the main office HA in fully automatic operation, which picks up current impulses sent by the calling sub-office subscriber and then sends them again to set up the desired connection path.

2 shows the circuit details of interest here of the sub-office U2 shown schematically in FIG arranged pair of voters, which consists of the call searcher AS and the line selector LW with an auxiliary selector EW consists.

As can be seen from FIG. I, dialer pairs consisting of call searcher and line selector are provided in sub-office U1, of which only the dialer pair consisting of call searcher AS1 and line selector LW is shown in FIG. From these pairs of voters branch off connecting lines allbi, a, / b2 to the sub-office U., which end there in the contact banks of dialer pairs also consisting of call seekers and line selectors ASILW. In addition to the connecting lines coming from the sub-office Ui, connecting lines arriving from the sub-office U3, which is designed just like the sub-office U1, and individual subscribers are connected to the contact banks of these voter pairs.In the exemplary embodiment, the individual subscribers and the groups of connecting lines are distributed over different decades of the line voter LW . The first decade is reserved for individual subscribers, while the connection lines to sub-office U1 are connected in the second decade and the connection lines to sub-office U3 are connected in the third decade. The various connecting lines are then also connected to the contacts of an additionally provided auxiliary dialer EW, which serves to adjust to the connecting line occupied during the call during the so-called @ dialing back into the calling sub-office group and to enable the further establishment of the connection in the next sub-office via this . From the sub-office U2, connecting lines, e.g. B. aolbo, to main office HA. Of course, the number of pairs of voters in the individual sub-offices and the connecting lines between the individual sub-offices as well as between the sub-office U2 and the main office HA can be arbitrary.

Calls in such a telephone system z. B. the subscriber Tn, the sub-office Ui, a free call searcher, z. B. AS "is set in motion, which adapts to the calling subscriber and connects him to a connecting line running to sub-office U2, e.g. a2 / b2. The incentive that is now effective in sub-office U2 causes this there Start of another free caller, e.g. the caller AS: This is shut down on the connection line a21b2 over which the call came in. After the shutdown of the caller AS, a switch-on dialer, e.g. AW, a free, The connection line aol b leading to the main office HA was left on in order to forward the call to the official's workstation in the main office HA. A call signal then appears there If the calling subscriber Tn has not waited for the connection to the main office HA , the officer will call him back using the route established during the call r calling subscribers can now through the placement of the officer connections beyond the main office HA with subscribers of another telephone network or after appropriate setting of the line selector LW in the sub-office U2 with subscribers of this sub-office or if the line selector LW and further setting of the line selector LW are influenced with a Subscribers of the sub-office U3 or if the line selector LW is influenced with the correspondingly initiated setting of the auxiliary selector EW and subsequent setting of the line selector LW, with a subscriber of the own sub-office U1. In the last-mentioned connection case, the line selector LW is set to the first contact of a certain decade by the code number of the connection line a, lb, which is occupied during the call and runs between the sub-offices U1 and U2, and sets the auxiliary dialer EW in motion without making a free choice ; this then seeks, also without making a free choice, the line identified by the call searcher AS of the pair of voters, occupied during the call and switches through to the line selector LW.

So, by setting the auxiliary selector EW, it becomes possible created if only one connection line between the sub-offices U1 and U2 is available to set up a dial-back connection to the sub-office Ui or, if several Interconnections between these two sub-offices exist for the Dial-back connection to use the line occupied during the call and thus the use to avoid another connection line.

This so-called dialing back into the calling sub-office or into the calling Sub-office group in the case of several sub-offices in a row should now be detailed will be described with reference to FIG.

If the subscriber calls Tn of the sub-office U1 (FIG. I) (lifting the handset, actuation of a crank inductor or a key, etc.), then a free call searcher in the sub-office LT "z. B. AS" is started who the calling subscriber Tn, seeks out. If, however, no call seeker is free at the moment, then calls are stored in a known manner, which then causes the call seeker to start up when a call seeker becomes free.

After the call searcher AS has been set to the calling subscriber Tn, it is connected to the sub-office U2, for example via the connecting line a2 / b2. An alternating current surge is sent from the sub-office Ui via the wire b2, by means of which the relay R is excited via its winding I. The relay R places itself in a hold circuit by closing its contact ir via this contact and contact 5 t. If the call seeker AS is free in the sub-office U2, the relay Ildt is excited via earth, battery, relay Mt, contacts i6sp, 149, j34 i2y, earth by closing the contact 12r. By closing the contact 22 Mt, the relay S is excited via earth, battery, relay S, contact 22 mt, earth. A circuit for the rotary magnet Das of the call seeker AS is closed via the contact 18s. It runs through earth, battery, rotary magnet Das of the call seeker AS, contacts aorl, igp, i8s, i6sp, 149, i3 t, i2r, earth. The call seeker AS consequently performs a switching step. the end. By opening the contact 2i of the rotary magnet Das , the short circuit of the winding I of the relay R1 is canceled, so that the relay R1 is excited in a branch to the excitation circuit of the rotary magnet Das and switches off the rotary magnet Das of the caller AS at its contact 2o r1 . It now sets the "well-known interplay between the rotary magnet Das -des call seeker AS and the relay R1, so that the call seeker AS is progressively advanced until it reaches the connecting line a2 / b2 occupied by the calling subscriber. In this case, the following current surge occurs: Earth, battery, relay T, contact c9 r or io t, winding II of relay R, contact iir, switching arm c of caller AS, windings I and II of relay P, contacts 62 Int, 63 ci, head contact 66 klw of the line selector LW, earth. In this circuit, relays T and P respond while relay R is kept energized. By opening the contact 5t the call storage via the winding I of the relay R is canceled, while by opening the contact 1 3 t the relays tVlt and R1 as well as the rotary magnet Das are de-energized. As a result of the opening of the contact 22 vvat, the relay S comes to waste. In the meantime, the activation of the relay P via the contacts 44p and 45p has switched through the speech wires, while the connection line a @ lb reached by the caller AS has been blocked by closing the contact 6op. By closing the contact 30p, the relay Sp is excited, which now by closing the contact 17 spden initiating circuit switches preparatory to the following call seeker, not shown here, so that further calls either from subscribers of the sub-office U2 or via connecting lines from other sub-offices to a second Voter couple of the sub-office U2 can arrive. After the relay P has been energized, the following circuit has been closed via contact 3 ip: earth, battery, resistor Wi3, contacts 3z p, 32 g, relay Azt, earth. The relay to responds in this circuit and causes a start-up of the switch-on selector AW for setting to the selected pair of voters ASILW by the calling subscriber in a way that is not of interest here. The test relay Po is connected to the switching arm d of the switch-on selector AW via contact 41, so that when the pair of selectors marked by contact 37 sp is reached, the following circuit is established: earth, battery, winding II of relay G, contact 33 g, Shaft contact 34wlw of the line selector LW, contact 37 sp, switching arm d of the switch-on selector AW, contact 41 an, windings I and II of the relay Po, earth. In this circuit, the relays G and Po respond. By opening the contact 32g, the relay A7a is de-energized, so that further switching of the switch-on selector AW is prevented. The relay Po blocks by short-circuiting its high-resistance winding I via its contact 4o p, the selected pair of selectors, while by closing the contacts io7po and io8po a connection is made via the connection line aolbo to the main office HA . In the meantime, as a result of the temporary closing of the contact iioaia when the switch-on selector AW was started, alternating current was applied to the wire b to the main office HA in order to generate a call in the main office HA. Instead of the main office HA , a further sub-office could of course first have been reached via the connection line aolbo, in which the corresponding R relay would then be excited by the alternating current connection in the same way as in the sub-office U2, in order to carry out the same switching processes there bring order through connection to the main office located behind HA. Any different switching processes do not occur. Assuming for the sake of simplicity. that in the present case the main office HA is already reached via the connection line aolbo, the call signal is switched on there by the alternating current. The officer answers the call by plugging the handle. This creates a circuit, not shown here, for relay J via wire a, the connecting line; it speaks. Closing contact 84i energizes relays C and Cl. By closing the contact 8o c you put yourself in a holding circle.

If the calling subscriber has now waited on the device, a relay corresponding to relay Y is energized via the subscriber loop in the sub-office Ui and has a battery potential applied to wire b2 via its contact corresponding to contact 70 y and via a choke coil corresponding to choke coil Dr2, by which the relay Y is energized via wire b2, switch arm b of the caller AS, contacts 45 p, 53 2c, 56 b, 57 k, 67e, relay Y, earth. The relay Y applies a battery potential to the wire bo of the connecting line via its contact 70Y and the choke coil Dr2, so that this gives a signal to the officer in the main office, which indicates that the calling subscriber has picked up the receiver.

If the calling subscriber has not waited on the phone, this is missing Battery potential, so the officer does not receive a signal. She calls the participant consequently back to the machine. This recall is initiated by a measure which affects the relay E in a known manner via the wire b in the sub-office U2 and from there again transferred to the sub-office Ui via contact 68e will, in which a call is then sent. When the participant reports, the Ringing current switched off. The officer now asks and can do one of the aforementioned Make connections.

In the present case, the establishment of a dial-back connection is of interest. Such is the case, for example, when the calling subscriber Tztl wants a subscriber in his own sub-office, that is to say the sub-office Ui. In this case, the officer must influence the line selector LW through the code number of the calling sub-office Ui. Since, as stated above, the connecting lines to the sub-office U1 are connected in the 2nd decade of the line selector LW , this code is the number z. The officer therefore initially sends two electric shocks. This current impulse is generated by the fact that the excitation circuit of the relay J running over the wire a is interrupted twice; consequently, inter alia, the contact 78i is temporarily closed twice so that the solenoid H of the line selector LW receives two current surges via earth, battery, solenoid H of the line selector LW, shaft contact 79 wlw of the line selector LW, contacts 78i, 77c, earth. During the current impulse, the relay V is energized intermittently via the contact 83 i and the relay hl is kept continuously energized as a delay relay. On line selector LW a decade contact 29 is dk provided which is closed each time the line selector LW is set to a decade, at the contacts connecting lines are connected. This decade contact is also closed in the present case, so that the following circuit is established: earth, battery, relay Q, contact 27 u, decade contact 29 dk of the line selector LW, earth. Relay Q is energized in this circuit. It lies in a holding circle via its contact 28 q. Then falls on: the end of the current pulse series the relay V1 from so coming q via the contact 75, since after the first lifting step of the line selector LW of the head contact 71 KLW the line selector LW is closed, the following circuit condition: earth, battery, rotary magnet D of the line selector LW, contacts 75 q, 74p1 73 rh 72 Z'1, head contact 71 klw of the line selector LW, earth. The rotary magnet D is excited in this circuit and turns the line selector LW into the decade reached. When the line selector LW is screwed in, the shaft contact ioo wlw of the line selector LW is closed, so that the relay K is excited via this contact and the contact 98 p1. By closing the contact 54k, the relay B is connected to the wire b2 of the connecting line arriving from the sub-office Ui. Since, as mentioned above, when the calling subscriber reports a battery potential is applied to wire b2, relay B is now energized; it remains independent of the contact 54k via its contact 55b. In the meantime, the excitation current of relay Y has been interrupted by opening contact 57 k , so that this relay drops out. As a result, a holding circuit for relay K is closed at contact 97y independently of contact 98p1.

Da / stands on einervom Unteramt U1 coming connecting line a2 b2 in the present case the call finder ASbereits and is characterized by the setting of the line selector LW a compound in the same direction (return option) comes immediately after the first step of rotating, the line selector LW following circuit concluded: Earth, battery, relay T1, contact 104A switch arm d of caller AS on contact 3, switch arm c of line selector LW on contact i of the second decade, windings I and II of relay F1, contacts 89v1, 9 1 k, 95 b, 94h earth . In this circuit, the relays T1 and P1 are energized. By opening the contact 74P, further actuation of the rotary magnet D of the line selector LW is prevented. Closing the contact II I t1 creates the following circuit: earth, battery, rotary magnet Dew of auxiliary selector EW, contacts i i3 r1, i i2 u, iii t1, earth. The rotary magnet Dew switches the auxiliary selector EW in interplay with the relay R1, the winding II of which is influenced via the contact io5 dew, until its switching arm c has found the contact 3 marked by the switching arm e of the caller AS. If this is the case, the following circuit is established: earth, battery, relay U, switch arm e of the caller AS, switch arm c of the auxiliary selector EW, contact iii t1, earth. In this circuit, the relay U responds and initially stops the auxiliary selector EW by opening the contact i 12 u. By closing the contacts 2 u and 3 u, the switching arms ca and b of the auxiliary selector EW are switched on in the speech path, so that a connection to the connection line a2 / b2 occupied by the call is established. After this through-connection, the contacts 46u and 53u are opened, so that the call seeker AS is switched off. As a result of this cancellation of the through-connection of the connecting line arriving from the sub-office U1 in the call searcher AS, the relay B connected to the wire b2 is de-energized. The test circuit of the call seeker AS, however, remains closed, so that the relay P is held. This gives the possibility that, for. B. if the desired connection does not come about, the officer can trigger the line selector LW by a special measure without triggering the path established via the call finder AS to the officer. This is because the relays J and E are influenced in a certain way by the officer, so that the line selector LW triggers with the auxiliary selector EW (C and Cl de-energized), but the call seeker AS (contact 65 e closed) is kept set will. The officer can then immediately establish a replacement connection without the participant having to set up the path to the officer again. Since, as stated above, the relay U has been energized in the course of the connection establishment, the relay 0 is further de-energized by opening the contact 27 and the holding circuit of the relay PI is maintained independently of the contact 95b by closing the contact 92zz.

From the above description it can be seen that when a series of current impulses is emitted, which characterizes a connecting line, the line selector LW is raised to a decade in which connecting lines in this direction are connected. After this series of impulses has elapsed, the line selector turns in automatically. If it is a reverse selection, the line selector LW is stopped on the first contact of the decade reached, which is characterized by the setting of its call seeker AS, an auxiliary selector EW is started, which is based on the call seeker AS via the switching arm e sets the connection line marked and already in use by the call. After this setting, the selector arms a and b of the auxiliary selector are switched into the speech path , bypassing the switching arms a and b of the line selector LW.

The auxiliary selector EW can now also be arranged in such a way that it does not bypass the line selector arms, but rather is in series with them by connecting all the first contacts of the connecting line decades in the speech contact banks and connecting the switching arms d and b of the auxiliary selector EW to them. The dialing back then takes place in the same way as above, in that the line selector after its setting on the first contact starts the auxiliary selector EW, which then sets itself to the switches through his switch arms.

If the line selector LW is replaced by the code of another sub-office, e.g. B. U3 is set, after the lifting movement there is also a reversal to automatic rotation; However, the line selector LW does not come to a standstill on the first contact of the third decade, its switching arm c does not find any identification at this first contact by the switching arm d of the caller AS, but it is activated by actuating its rotary magnet D in interplay with the winding II of the Relay R1 (contacts 73 r1 and ror d) switched on until its test relay Pl z. B. on the wire c3 a free connection line, z. B. aslbs, has found the sub-office U3. This then creates the following circuit: earth, battery, a relay corresponding to relay T, a contact corresponding to contact 8 r, test wire c3, switching arm c of line selector LW, windings I and II of relay P1, contacts 89 v1, 9z k , 95 b, 94h earth. By opening the contact 74 p1, a shutdown of the line selector LW on this connecting line and a through-connection via the contacts 86p1 and 87p1 is brought about. The other switching operations then proceed in a known manner.

Accordingly, when dialing back into the calling sub-office group comes through influencing the line chooser, the setting of his call seeker the line selector on the first contact of the marked decade comes to a standstill and sets an auxiliary selector EW in motion, which is dependent on from the call finder already set to the line used for the call, while on the other hand when choosing a different traffic direction depending on the usual Test process from the line selector a free connection line of the marked Traffic direction is sought.

Claims (1)

PATENT CLAIMS: r. Circuit arrangement for telephone systems with dialer operation and several exchanges lying in series, between the calling connection points via preselection switchgears accessible connecting lines run, via which these connection points .eine .a other dialers used can be influenced to establish a desired connection, characterized in that when the dialer (LW) is influenced by current surges which correspond to the code number of the connecting line (a.1b. ) correspond, switching devices (T1) become effective, which enable a setting of auxiliary dialers (EW) that can be switched into the speech path to the connection line (a, lb2) occupied by the upstream exchange (U1) according to the setting indicated by the at Call set preselection switch (AS) initiate marking. ?. Circuit arrangement according to Claim i, characterized in that the switching devices (T1) are effective in a circuit which is established by matching the setting of the selectors (LW) accessible via the connecting line with the preselection switching mechanism (AS) set on the connecting line occupied by the call. 3. Circuit arrangement according to Claim 2, characterized in that: that to determine the matching setting of the selectors (LW) accessible via the connecting line with the Voxwahlschaltwerk (AS) the first contact of each connecting line group in an auxiliary contact bank (c) of the selector (LW) with the Contacts (2, 3) which correspond to individual line groups and which are multiple-switched within each line group are wired in a multiple contact bank (d) of the pre-selection switch (AS) q. Circuit arrangement according to Claim 3, characterized in that the selection (LW) are shut down on the first contact of the group of connecting lines characterized by the current impulses when the setting corresponds to the preselection switching mechanism as a result of their influence by the code number of the connection line occupied during the call. 5. Circuit arrangement nachAnspruch4, characterized in that the shutdown of the selector on the first contact takes place by test switching means (P1), which otherwise in the event of a mismatched setting due to their influence by the code number of an unoccupied connection line during the call, the shutdown of the selector on a corresponding current impulses Create a free line in the direction indicated. 6. Circuit arrangement according to Claim 5, characterized in that: the test switching means (P1) are energized in series with the switching devices (T1) via the circuit in series with the switching devices (T1) which has been established by the matching setting of the voters with the preselection switch set during the call. 7. Circuit arrangement according to claim a or 6, characterized in that the switching devices (T1) close an automatic surge circuit for the working magnet (Dew) of the auxiliary selector (EW) when they become effective. B. Circuit arrangement according to Claim 7, characterized in that: the automatic current impulse circuit for the working magnet (Dew) of the auxiliary selector (EW) is interrupted by a switching means (U) which comes into effect when the auxiliary selector (EW) is set to the same setting with the preset switching mechanism (AS) . 9. Circuit arrangement according to Claim 8, characterized in that, in order to determine the matching setting of the auxiliary selector (EW) with the preset selector switch (AS), contacts of an auxiliary contact bank (c) of the auxiliary selector (EW) and .einer auxiliary contact bank (e) of the Vonvahlschaltwerkes (AS) correspond to the individual connecting lines ) are wired together. ok Circuit arrangement according to Claim 8, characterized in that the switching means (U) switches on switching arms (a, b) of the auxiliary dialer (EW) in the speech path to the upstream exchange after they have been set to the connection line occupied by the upstream exchange when a call is made. i i. Circuit arrangement according to Claim io, characterized in that after the switching arms (a, b) of the auxiliary selector (EW) have been switched into the speech path to the upstream exchange, the switching arms (a, b) of the preselection switching mechanism (AS) lying in the speech path are activated by the switching means (U ) must be switched off. 1a. Circuit arrangement according to Claim i, characterized in that the contacts of the voice contact banks (a, b) in the preselection switch (AS), the selectors (LW) and auxiliary selectors (EW) are wired to one another in accordance with the connections of the individual connecting lines.