DE684279C - Circuit arrangement for telephone, especially private branch exchanges - Google Patents

Description

Circuit arrangement for telephone systems, in particular private branch exchanges The present invention relates to telephone systems, in particular private branch exchanges, in which a hunt group connection between the connection points located in the inquiry connection and the during the Consultation connection switched off connection point can be established. She aims; the subscribers switched on in a consultation call to establish To facilitate collective connections, in particular operating errors due to non-observance of special regulations to be taken into account when establishing the inquiry connection to avoid.

The conversion of a consultation call into a hunt group should also not, as a known embodiment shows, from the cooperation of both dependent participants connected via a consultation path, but the switching measure to only one of the two subscribers activated in the inquiry connection suffice to switch these two subscribers with the switched off during the consultation call To couple participants. Furthermore, the inquiry facilities should also be provided if the provision is made the possibility of converting inquiry calls into hunt groups as easy as can only be designed in any way possible. This is achieved in that in the exchange arranged switching means the collective connection during the duration of the actuation of a the cancellation of inquiry connections serving switching element on only one of the bring about the connection points activated in the inquiry connection.

In systems in which the reassignment of connections following Consultation connections is provided, expediently leads the giving the transfer incentive Connection point also brings about the interconnection of the participants by the switching means, which bring about the interconnection of all connection points, under the influence this connection point and for the duration of the switching measure at the connection point Establish a collective connection while taking the switching action under Cancellation of the collective connection, the transfer of the main connection to the requested one Connection point is carried out. If connections are reassigned by taking over, so can also the inquiring connection points, which are canceled with the Can connect the inquiry call again with the disconnected connection point, the possibility of creating hunt groups can be given by under to the Influence of this connection point standing switching means for the duration of the switching measure to restore the main connection, establish the hunt group while when the switching measure is terminated and the collective connection is canceled, the interconnection the inquiring office with the switched off during the inquiry connection Connection point takes place.

In a system, both participants have the option of converting given by inquiry into collective connections, the connection point that has wants to continue the main connection alone, it is in hand, the second connection point to temporarily participate in the main connection in the inquiry connection, without the need for special switching measures or the observance of special operating regulations requirement.

The invention is applicable to telephone systems of any operating mode, both with telephone systems with dialer operation as well as with those with manual operation.

In the drawing is an exemplary embodiment of the invention, a private branch exchange shown with voter mode, in which about the traffic between the participants outgoing and incoming connection devices serving the private branch exchange Exchange connections as well as consultation connections are established.

Not all of them are essential for understanding the subject matter of the invention required facilities and circuits have been omitted. I. Outgoing Exchange connections If the subscriber Tnl wishes to establish an outgoing exchange connection, so after lifting the handset and setting the caller AS on his connection line the group selector GW is set to the contact group to which trunk lines VZ are connected. The group voter searches for a free exchange line in a known manner TL off. After setting this, the calling subscriber receives his Feed current via the bridge consisting of the relay S and X1, but in which only the relay S responds; while relay X1 is a differential relay and consequently does not respond in the supply current. The relay S closes, inter alia. his contact i s and thereby causes the excitation of the relay L via its winding I. The remainder the following bridge is set at the contact for 2 s between wires 3 and 4 of the VZ exchange line Established: wire 3, contacts a s, S 29l, transfer winding 6, contact 7 ml, resistor 8, Üöertragerwicklüng 9, contact i o 29i, wire 4. By closing this bridge is in a known manner the setting of pre-election organs in the public office and thereby brought about the provision of the first numbered surge receiver. The calling subscriber can now establish the connection by sending out number power surges produce in the usual way.

It should also be mentioned that when the trunk line VL is seized, relays T and C1, not shown, would be energized. The relay T caused through its contact izt - the excitation of the relays T1 and X. The relay X opened its contact 12x and thereby prevented an excitation of the relay X1 via the winding III after the closure of the contact 13 t1. Furthermore, an excitation circuit independent of the contacts is and 15 m1 is closed via the winding I of the relay L at the contact 14t1. The relay C1 switched through the access to the exchange line VL coming from the group selector GW at its contacts i 1 6 c1 and i 17 c1.

The relay L excited when the trunk line VD is occupied switches the winding II of the relay X on contact 161 in parallel with the capacitor 17 between the transformer windings 18 and i9. Furthermore, the contacts 2o 1 and 21 1 are opened: "By opening the contact 631 a premature influencing of the switching relay group consisting of the relays Ui, U2, U, is prevented he temporarily presses the RT button on his station, thereby applying earth to the lower voice wire via the choke coil Dyi, which means that the current flowing through winding I of relay X1 increases and that through the winding The relay X1 responds and closes the following circuit: +; Contacts 22 t1,: 23Y1, winding I of the relay Zl, contacts 24x1, 295ü.3, 26u2, -. The relay Z1 responds , prepares a holding circuit via its winding II at its contact 27 29i _ and an excitation circuit via winding I of the relay Y1, puts the choke coil Drs i at contact 28 291 n Bridge to wires 3 and 4 of the exchange line VZ and switches the inquiry connection of the exchange line to the contacts 29z and 30z1. Transformer windings 6 and 9 with the separation of the trunk line VL leading to the public office.

If the subscriber Tnl releases the query button RT, the differential relay X, drops out and opens the contact 24x1. The following circuit is now established via the holding winding II of the relay Z1 and the excitation winding I of the relay Y1: +, contacts 22 il, 23 y1; Windings I and II of relay Z1, winding I of relay Y1, contacts 27 z1, 25u3, 26u2, -. The relay Y1 can now respond. It closes its contact 31 y1 and then opens its contact 23Y1, whereby the holding winding II of the relay Y1 is switched on in place of the excitation winding I of the relay Z1. At contact 32y1 the following bridge is now established between wires 33 and 34 of the inquiry line: Wire 33, contacts 35 u3, 36i of a relay J, 32y1, 30z1, not shown, transformer winding 9, resistor 8, contact 7m1, transformer winding 6, contacts 29z1, 37 2c3, wire 3a-.

The closure of this bridge has the consequence that a free call seeker AS adjusts itself to this consultation connection. The calling subscriber Tnl can now establish the inquiry connection with the desired subscriber T222 by sending out number bursts. The transfer of the number current surges takes place in a known manner in that the relay S in the feed bridge of the calling subscriber actuates a relay J via a winding I (not shown) which, by opening its contact 36i, interrupts the circuit of the current surge relay to the number surge receiver of the inquiry path. In the line selector LW , relay A is the current surge receiving relay.

After setting the line selector LW to the line of the desired Subscriber T222 becomes a not in a known manner if this subscriber is free illustrated test relay P energized, which by closing its contact 38p an influencing of the relay Z prepared.

If the desired subscriber Tn2 reports, he receives his feed current via the feed bridge consisting of the relays B and Y. It only responds to relay Y, but not differential relay B. Relay Y closes its contacts 39y and 40y and also opens its contact 41y. By closing the contact 39y, the relay M1 is excited via the winding I as follows: +, contacts 39 y, 42 z, 43, switching arms 44 of the GW, 45 of the AS, wire 46, contact 47 u2, winding I of the relay Ml, -. The relay M1 responds and is in the following circuit: -E-, contact 48y1, 49u ", 50» 4, winding II of the relay Ml, -. It is also activated by closing contact 51 m1 and then opening the contact 721-a1 the winding II of the relay L is connected in place of the resistor 8 between the transformer windings 6 and 9. The conversion of the inquiry connection into a collective connection is prepared at the contacts 52 ml and 53 m1 and the transfer of the exchange connection is prepared at the contact 54m1.

After closing the contact 5 im, the winding II of the relay L is switched on in the following circuit:.-J-, winding II of the relay A, contacts 55 b, 56, switching arms 57 of the GW, 58 of the AS, wire 33, contacts 35u3 , 36i, 32Y1, 30z " transformer winding 9, winding II of relay L, contact 51 ml, transformer winding 6, contacts 29z1, 37u3, wire 34, switching arm 59 of the AS, switching arm 6o of the GW, contacts 61, 62b, winding I of the relay A, -.

The one flowing into this circuit via winding II of relay L. Current supports the effect of the current flowing through winding I. The relay L remains excited accordingly.

In the line selector LW , when relay Y responded through contact 4o y, a current surge was closed for the delayed responding relay Z, which switches on at contact 64 z in a holding circuit independent of contact 40Y. It also opens its contact 42 z and closes its contact 65 z. By opening the contact 42z, the excitation circuit is interrupted via the winding I of the relay Ml. A change in the direction of the current through the winding II of the relay L is prepared by contact 68 z. III. Hunt group i. Establishing a collective connection by the queried subscriber First consider the case that the queried subscriber Tn2, who also has the option of transferring the exchange connection, wants to bring about an interconnection of the two subscribers connected to the query connection with the disconnected subscriber. For this purpose, he presses the button RT2 and holds it in the pressed position. As a result, earth is applied to the lower voice wire, the current through winding I of differential relay B is increased and the current flowing through winding II is weakened. The differential relay B responds, it closes its contacts 66 b and 67 b and opens its contacts @ 62 b and 55 b. This reverses the direction of the current through winding II of relay L. The effects of windings I and II therefore cancel each other out, relay L drops out and closes its contacts 201, 211 and 63 L. By closing contacts 2o 1 and 21 1 the collective connection is established because the inquiry connection is connected to the wires 3 and 4 of the exchange line vL via the contacts 52m "2-0 1, 53 m1 and zil.

At contact 6.31 a circuit is closed via winding I of relay Ui: -E-, contacts69ti, 631, 54m1, 702z2, winding I of relay Ui, -. The relay U1 closes its contact 7 i u1. It thereby prepares a holding circuit via its winding II and an excitation circuit for the relay U2.

As long as the relay L has dropped out and the subscriber Tn, the button RT "is held down; the collective connection exists. A significant weakening of the Speech current is switched on by the earth connection at the call station Choke coil Dr2 avoided.

z. Canceling the hunt group and transferring the trunk connection If the subscriber Tn wants to continue the exchange connection alone, he leaves his RT key, go, the differential relay B drops out; it reverses the direction of the about that Winding II of relay L current flowing by opening contacts 66 b and 67 b and closing of contacts 62 b and 55 b again around the two windings T and II of L support each other again, the relay L responds. The contacts 2o1,: 2i l and: 631 are opened.

The hunt group is canceled. At the same time, the short circuit around the windings II of the relay U1 and I of the relay U2 is canceled. The relay U2 responds and switches on its holding winding II at contact 72 2c2, disconnects the excitation winding of relay U1 at contact 70 u2 and connects the inquiry line 33, 34 with windings 18 and i 9 at contacts 732c2 and: 74u2 of the transmitter U e with simultaneous disconnection of the access to the exchange line VZ occupied by the subscriber Tnl by opening the contacts 75 u2 and 76u2.

The excitation of relay U2 also caused the switch-back relay group to be switched off Y1 and Z1 by opening contact 26u2. The relays Y1 and Z1 drop out: To the Contacts 5z, and iozl, the trunk line VL is switched through. By closing of contact 77u2 will again influence the inquiry changeover relay group prepared. A delayed response relay U3 is switched on at contact 78u2, the preparation by opening contact 25u and closing contact 782c3 for a renewed influencing of the inquiry changeover relay group completed and through the contacts 35 u3, 37U3 open and the contacts 79ü3 and 8o u3 close Inquiry port of the exchange line from inquiry line 33; 34 on the veins 86, 87 of the part of the exchange route running in the private branch exchange switches over. The subscriber Tnl can hang up his handset. The opening of the contact zs at Drop of the relay S is irrelevant, since this contact in a known manner, the was only hinted at here; was bridged by other switching means.

3. Establishing a collective connection by the inquiring party. In the exemplary embodiment shown in the drawing, it is also possible for the inquiring participant to be able to establish the collective connection. For this purpose, he presses the RTi key, just as he did when initiating the inquiry connection. He keeps it pressed, the relay X1 responds, it short-circuits the windings II of the relay Z1 and I of the relay Y1 at contact 24x1. Relay Z1 drops out while relay Y1 remains energized. The external line TIL is switched through at contacts 5 z1 and iö z1 and the inquiry connection is switched off by opening contacts 29 z1 and 30 z1. However, since a relay Sa has been energized via contacts 8 i x1 and 82 y1, the consultation connection is applied to contacts 84sa and 85 sca to the switched-through exchange line TL. This hunt group remains: active; as long as the subscriber Tyal keeps the button RTl pressed 4.Cancellation of the collective connection and continuation of the exchange connection by the inquiring party If the subscriber releases the button RT, the relay X1 drops, it opens the contact 24x1: This is the winding II of the relay Y1 existing holding circuit open. The relay Y1 drops out. It opens the circuit at its contact 32y1 via relay A1 in the line selector.

From the description above it can be seen that a call-back connection existing participant by executing those switching measures that cancel the the consultation connection and the establishment of the connection between one in the Inquiry connection activated connection point with the during inquiry connection disconnected connection point initiates a collective connection between the participants the inquiry connection with the during the consultation call can cause disconnected participants. Because both participants have the opportunity the establishment of hunt groups is given, the subscriber who later wants to continue the exchange connection alone, a temporary one by pressing a button Interconnection of all participants, for example for the purpose of eavesdropping of the other participant in the consultation call.

It can also be seen that the subscribers only have to observe a single operating rule, namely to hold down the button on their station for the duration of the collective connection. Any operational complications for the subscribers, such as observing special switching measures when setting up the inquiry connection, operating special switching means to establish the collective connection, is avoided. IV. Inquiry connection with transferred trunk connection. It has been explained above that when the exchange connection was transferred, the inquiry connection of the exchange line was switched off from wires 33 and 34 and switched on to wires 86 and 87. At the same time a relay Ra was excited via its winding II: contacts 48h, 88ta, 89u ,, winding II of the relay Ra, -. The relay Ra connects the wires 86 and 87 with the wires 92 and 93 at the contacts 9o ra and 9r ra. By opening the contact 49u3, the holding circuit was also opened via the winding III of the relay Ml and at contact 94u, a new holding circuit for the relay Ml prepared. The relay Ml drops out. The winding of the relay L 1I is at the contact 5 i m, switched off and it switched on at the contact 7 in the resistance. 8

If the subscriber Tn2, who is now in connection with the exchange line VL, wants to set up a further inquiry connection, he presses the RT button. The differential relay B responds again and changes by opening the contacts 62 b, 55 b and by closing the contacts 66 b, 67 b the direction of the current through the winding II of the relay X. The effects of the currents flowing through the windings I and II cancel each other out, relay X drops out and switches on winding III of relay X1 at contact r2 x. The relay X1 responds and closes its contact 24x1, thereby controlling the inquiry switchover relay group, consisting of the relays Z1 and Y1, in the same way as is described in section II when an inquiry connection is made by the subscriber Tnl. If the subscriber Tn2 releases the button RT, then relay B drops out, the direction of the current through the winding 1I of relay X is changed again, relay X responds again, relay X1 switches off. Contact 24x1 is opened, relay Y responds. The consultation switch is now carried out.

Since contact 32y1 is now closed, there is a bridge between the wires 92 and 93 via the transformer windings 6 and 9 and the resistor 8 made. The call relay, not shown, connected to wires 92 and 93 is energized. A call finder AS sets itself on the line 92, 93. The inquiring participant Tn, can now emit current impulses by pressing his number switch the relay Y to drop out, which by closing its contact 41 y the Relay J actuated via its winding II. The relay J transmits by means of the contact 36i these current surges on the surge receiving relay of the number surge receiver the inquiry connection path.

It should also be mentioned that when setting the call seeker AS on the line 92, 93, a circuit was closed via the windings I of the relays Ta and Ra, since both windings are switched on in the test circuit, with the result that the relay Ra during the Duration of the inquiry connection is kept energized while the relay Ta is energized. The latter opens its contact 88 ta and closes its contact 94 ta, thereby switching itself on via its winding II into a holding circuit. If the subscriber called in the inquiry connection answers, then in the same way; As described in section TI, relay 11i1 is energized, but this time via its winding II. By closing contact 51 ml and opening contact 7m1, winding II of relay L is switched between transformer windings 6 and 9 in place of resistor 8.

There is now the possibility that both the inquiring participant Tn, by pressing his button RT, as well as the queried subscriber a Can initiate hunt group. The inquiring subscriber Tn is through this Press the button RT., If he can later continue the exchange connection alone wants, while the inquired participant will establish the hunt group, if he intends to connect to the trunk connection after the hunt group to take over.

V. Incoming exchange connections The establishment of incoming exchange connections can take place in any arbitrary way, for example by the fact that, as a result of an incoming call via the exchange line VL, a call signal is switched on at the place of an officer who asks the setting of a call seeker AS on the calling one Triggers the exchange line and then sets the group selector GW and the line selector LW to the desired subscriber by means of number bursts.

The arrangement can also be made so that in connection to the incoming exchange call automatically a call seeker AS is on the calling Trunk recruits; whereupon the calling subscriber by number current impulses brings about the setting of the dialer of the private branch exchange.

Claims (7)

PATENT CLAIMS: e.g. Circuit arrangement for telephone; in particular private branch exchanges in which a collective connection can be established between the connection points switched on in an inquiry connection and the connection point switched off during the inquiry connection, characterized in that switching means (e.g. L; Sa) arranged in the exchange switch the collective connection during the duration of the operation one of the switching elements used to cancel inquiry connections. (e.g. non-locking key RT, or RT,) on only one of the connection points activated in the inquiry connection (Tn2, Tn,). 2. Circuit arrangement according to claim i, characterized in that the switching means (L) under the influence of the requested connection point (T n2) and for the duration of a takeover the main connection initiating switching measure this connection point the collective connection establish, while at the end of the switching measure with cancellation of the collective connection the main connection is transferred to the requested connection point. 3. Circuit arrangement according to claim 2, characterized in that the relay (L) initiating the transfer of the main connection causes the interconnection of all connection points (at the contacts 2o L;: 2 1 1). 4. Circuit arrangement according to claim z, characterized in that, when the collective connection is made (at the contacts ao l and Z 1 1), the transfer of the main connection (at the contact 63 L) is prepared (by the relay L). 5. Circuit arrangement according to claim z, characterized in that that the production of the collective connection by changing the current direction in the Inquiry routes (33, 34) and the cancellation of the hunt group and transfer of the main connection on the requested connection point (Tit2) when the current direction is changed again is brought about. 6. Circuit arrangement according to claim i, characterized in that that the switching means (Sa) under the influence of the inquiring connection point (Tn,) stand and for the duration: the on a cancellation of the consultation connection and restoration the main connection directed switching measure this connection point the collective connection establish, while at the end of the switching measure with cancellation of the collective connection the main connection is restored. 7. Circuit arrangement according to claim 6, thereby. characterized in that the switching means (Sa) from the inquiry changeover relay group (Z ,, Y,) can be controlled. B. Circuit arrangement according to claim 7, characterized in that that the influencing of the switching means (Sa) when establishing a query path is prepared (at contact 82 y1) and through which the incentive to repeal the inquiry connection receiving relay (X,) takes place. G. Circuit arrangement according to claim i, characterized in that when reporting the in a consultation call called connection point the hunt group is prepared (at the contacts 52 fit, and 53 m,).