DE573442C - Circuit arrangement for telephone systems with several branch points lying on a common line - Google Patents

Description

The invention relates to a circuit arrangement for telephone systems with several Junction points located on a common line.

Arrangements are known in which each participant shares a common line Call several specific participants by sending certain characters and to the Can prompt you to switch on. This operating mode is used in systems without secret traffic, with those, since the call signs are perceived at all branch points, all participants, i.e. also unwanted ones, have the opportunity to join the line and make calls for they are not meant to overhear.

In order to now also use this operating mode in systems with secret traffic, i. H. in systems, in which, when the shared line is busy, subscribers who are not called do not call to be able to switch on the common line, to be able to use, are according to the invention Switching devices are provided, whereby each participant has several branch points assigned to the same company management, which by themselves are not switched to the occupied company management can call one after the other and communicate with them at the same time.

In such systems, facilities can advantageously be provided which subscribers preferred, e.g. B.

Supervisors, allow themselves to terminate a connection before the rest of the normal ones To connect participants to the shared line that becomes free. For this purpose, but also for diversity Switching devices are to compensate for in the return times of the individual switchgear provided which the branch parts when terminating a connection block temporarily even after the dialing equipment has returned to its idle position.

The invention is described using an exemplary embodiment in which by a Relay arrangement it is achieved that a connection established in a known manner any two participants of the same company management nor any number of participants be connected to the same company management by the calling subscriber without disconnecting the existing connection. In the embodiment the case that frequently occurs in practice is also taken into account that the company management with a self-connection office or with a second company management can contact. In this case, the switching center for such connections is activated by pulling a Code number for the following station selection pulses made ready for operation. In order to now the selection impulses do not affect the stations of their own line, input

directions provided, which the following the code number impulses for your own line 'make it ineffective.

On the basis of the illustration, the concept of the invention is shown, for example Circuit arrangement described as follows.

A number disk ίο is provided in a known manner for the selection of the desired participants, which is shown in the figure only by the contact η i . When the dial is activated, an impulse relay / alternating current impulses are sent to the a- and & -wires of the company line, which in each subscriber station act on the impulse relay / on a stepping mechanism via the phase relay R ₁ , which in the figure is caused by the incremental magnet Tr and the contacts tr ^ to tr _{s is} marked ao. The contacts Jr ₁ to tr ₅ are closed and opened in different positions of the stepping mechanism, so the contact tr _{t is} only in the rest position of the stepping mechanism in the position indicated by α. After the first switching step, it assumes the position indicated by b until the switching mechanism returns to the rest position. The contact tr ₂ is controlled so that it is closed only for the desired participant after a certain number of current surges on the stepping mechanism. In the following, it will be referred to briefly as the station contact. The contact tr _s , called office contact for short, is only opened after the number of current pulses assigned to the exchange for connection to an office or a second company line. The contacts tr _A and tr ₅ are pulse contacts which are actuated each time the incremental magnet Tr is energized.

The ^ / relay (U /, U ₁ I) is used to connect the subscriber headset, represented by T in the figure, to the company management. When the company line is unoccupied, it is only excited depending on the hook switch with contact A ₁ ; when the line is busy , it is excited by the station contact tr _{2 in} addition to the hook switch. In addition to its pick-up winding U ₁ , the £ / relay also has a holding winding Uu, which is connected in such a way that it can only be de-excited by the drop-out of the iT relay (K ₁ , Kn), which marks the end of the common conversation.

The! 7 relay of the calling subscriber causes the blocking of the same against other subscribers by a pre-pulse via the pulse relay / on the company line, namely that all step-So switching devices Tr are advanced by one step and thereby the contact h \ out of the with α is brought into the position marked b . The i £ relay is also energized on all stations via the pick-up winding K ₁ during the pre-pulse and is held by the holding winding K _{n in} such a way that only the caller can trigger it through a longer current pulse over the company line, which characterizes the end of the conversation Participant is able to be disposed of. The ^ relay (S ₁ , S _n ) fulfills two tasks: It enables the called subscriber to switch to the company line occupied by the calling subscriber, and prevents subscribers who are not involved in the existing call from switching to the line and thereby, being able to overhear and disturb the conversation. In addition to its pull-in winding .S "/, it also has a holding winding S ₁₁ , which is made dependent on the hook switch.

In the circuit of the incremental magnet Tr , the relay V is arranged, which has a drop-out delay and therefore lasts over the series of pulses.

The mode of operation of the circuit arrangement is as follows.

When the handset is picked up at T , the relay U via the pull-in winding U _{1 is} triggered on the calling station by flipping the hook switch with the contact Zi ₁ (-, U ₁ , H ₁ , S ₅ , tr _la , +). By actuating the contacts M ₁ and U ₂ , the pulse relay / is excited (-, U ₁ , S ₆ , J, S ₂ , U ₂ , tr ^, tr _1?, +). The relay gives a pre-impulse to the company management in the following way.

An alternating current source is applied to the a- and & -wires via the contacts i _B , % and the previously closed contacts U ₃ and M ₄ , so that all phase relays R respond. Except in the calling station, the pulse relays / all other stations are now energized (+, r, U ₂ , S ₂ , J, s _e , M ₁ , tr _s ). By closing the% contact, the incremental magnets Tr and the F-relay connected in series are energized in all stations (-, tr _B , Tr, V, i _lt -f-). V ₃ brings the busy signal B to all stations (-, B, W _s , V ₃ , +). The / relay excites the / i relay through the ^ contact via the pull-in winding K, (-, M ₁ , s _t , i ₂ , K ₁ , tr _la , +). In all stations, therefore, is now excited: J, Tr, V, B, K; in the calling station also U. When the switching magnet Tr is excited, the contact tr _{s is switched over} . This interrupts the circuit for the / relay in the calling station (-, M ₁ , s _e , J, S ₂ , U ₂ , tr ₅ , ^ iO) H ~). This means that the contacts ^ and% are sent to the company

Line-switched AC source disconnected and the phase relay R de-energized. This also interrupts the circuit of the / relay (+, r, U ₂ , S ₂ , J ₁ s ₆ , U ₁ , tr _s , -) on all other stations. By opening the% contact, the switching magnet Tr and the [/ relay are deenergized on all stations. When the armature falls from the stepping magnet Tr , the stepping mechanism is switched one step further and the contact iri is thereby switched to the position marked b on all stations. By i ₂ is the circuit if the pickup winding; of the Z relay interrupted. However, K is held by the holding winding Ku and the folded contact tr _X b (-, W ₁ , K _n , Ji ₁ , tr _lb , +). The circuit interrupted by v _s for the busy signal B is replaced by -, B, W ₂ , tr _lb , -J-. After completing the switching processes triggered by turning the hook switch, the system is in the following switching state.

All step switching functions are switched one step further so that the contact ir _± is in position δ. All if relays and busy signals B are energized. In the calling station U is still excited, namely in the holding circuit via the winding U _n and the contact k ₂ (-, U _h k ₂ , U _n , u _B , +).

The selection is made in a known manner by pressing the dial, the pulse contact ηi of which is only shown in the figure. Through the contact η i the pulse relay / in the calling station is excited and de-excited (-, U ₁ , s _e , J, S ₂ , U ₂ , ni, +), the alternating current impulses via the contacts% and z ' ₄ the line there. In the manner already described, the series of pulses is transmitted via the phase relays R, the pulse relays / the other subscriber stations (+, r, U ₂ , S ₂ , J, s ₆ , U ₁ , tr _s , -) to the incremental magnets of all stepping units Tr ( -, tr ₃ , Tr, V, I ₁ , +). After the series of pulses, the station contact tr ₂ is only closed on the desired station. If after a certain time the delayed F relay has dropped out, the circuit for the Wkker W- is closed by the Fj contact at the desired subscriber (-j%, W, tr ₂ , V ₁ , +). At the same time, a circuit is formed in the called station for the pull-in winding S _{1 of} the * S "relay (-, u _s , S ₁ , k ₃ , tr ₂ , U ₁ , +).

If the called subscriber picks up his receiver, the pick-up winding U _{1 of} the.? 7 relay of his station is excited _{by flipping the hook switch to contact A 1} (-, U _h U ₁ , tr ₂ , V ₁ , - J-) and the circuit via the holding winding U _n (-, U ₁ , k ₂₎ Uu, ie, "f"): prepared. The alarm clock W is switched off by opening the M _{5 contact.} Instead of the pull-in winding S ₁ , which is also switched off, the ^ "relay of the called subscriber is held by the holding winding S _n depending on Ji _{2 of} the hook switch (-, S _n , S ₁ , A ₂ , +). Through the contacts% and U ₁ , the called subscriber is switched to the company line so that the voice connection with the calling subscriber is established. After the called subscriber lifts the receiver, the circuit status of the system is as follows: All stepping mechanisms are by an equal number of steps ^x forwarded from the idle position, all iT relays and busy signals B are energized; the LZ relay is energized in the calling and called station, and the S relay in the called station.

If another participant is to be included in the speech connection, so a series of power surges is triggered by the dial, the number of which equal to the difference between the number of ■ · ■■ the subscriber to be called and the subscriber assigned before this subscriber Power surges is.

The transmission of the impulses via the impulse relay / the calling subscriber to the phase relays R of all stations takes place as described above. Likewise, as described above, the impulses are transmitted to the indexing magnets Tr of the stepping mechanisms of all subscribers with the exception of the subscriber who has already been called. On the station that has already been called, the pulse relay is controlled via contacts s ₂ and s _e (+, r, s ₂ , J, s _s , tr ₃ , -). The transfer to the incremental magnet Tr takes place, as described above, through the iV contact (-, tr ₃ , Tr, V, I ₁ , +). Since the CZ relay is energized for the subscribers who have already been called and thus the contacts u _a and U _{4 are} closed, it must be prevented that the AC power source influences the company line when its pulse relay is actuated. This is done through the contacts J ₃ and J _{4 of} the ^ relay, which is only excited by the subscribers who have already been called. The calling and the establishment of the voice connection takes place with the subscriber selected later as already described. Any number of participants can be included in the speech connection in the manner described above.

An influence on the existing speech connection z. B. by pressing the dial or especially the hook switch, the called subscribers do not have there

In the speech state, the system can only be influenced via the pulse relay 7 and the pulse relay / is only accessible to the calling subscriber (-, U ₁ , J ₆ , J, S ₂ , U ₂ , η i or h ₂ , +)

If the calling subscriber hangs up his receiver at the end of the call, the / relay is excited (- ■, U ₁ , J ₆ , /, s ₂ , u ₂ , lh> +) · The / relay puts i through its contacts _s and i ₄ the AC source to the company line in the manner already described, so that all phase relays R are energized. The excitation of the i? Relays takes considerably longer than the pick-up time during a setting pulse. The holding winding K _{tJ of} the if relay is short-circuited by the r contact of the i? Relay (+, r, K _n , k _lt tr, l _b , +). The .KT relay, which was held during the setting impulses in spite of the then also acting short circuit through the r -contact, but which was always only of short duration, now drops out and interrupts the holding circuit for the _{through the £ 2 -contact} U relay of the calling subscriber (-, U ₁ , k ₂ , Uu, ^u e> +) · By opening the contacts u _s and M ₄ , the alternating current source is switched off from the company line, so that all Iu relays are de-energized. The last described alternating current pulse on the line, the duration of which is conditioned by the sum of the drop times of the if relay and the [/ relay of the calling subscriber, causes the i £ relays of all other subscribers to drop out due to the short circuit across the r contact . When the K relay _{drops out, the £ 2} contact opens the holding circuit for the still energized [/ relay (-, Uj, k ₂ , Un, ^W 6> +). All [/ relays are therefore deenergized now. Through the £ ₃ contact, all S relays receive power from -% i Si, & 8, tr _lb , -J-. As long as the phase relays R are excited, the following circuit is closed for all pulse relays /: -) -, r, J ₂ , /, J ₀ , tr _s , -. As long as the / relays are energized, the switching magnets Tr and the F relays are also energized (-, tr _a , Tr, V, I ₁ , +). At the end of the long tripping current pulse over the line, the circuit status is therefore as follows.

In all stations, R, S ₁ T ₁ Tr ₁ V, B are under power.

After the 2? Relays are de-energized, all stepping mechanisms are switched to the rest position independently of one another. When contact r is opened , all pulse relays / are de-excited (+, r, J ₂ , /, J ₆ , tr _s , -). All indexing magnets Tr are thus de-energized (-, tr _s , Tr, V, I ₁ , +), and all indexing mechanisms switch one step further. . The / relay is now energized in all stations independently of one another via -, tr _s , J ₀ , /, J ₂ , tr ₄ , S ₁ , tr _lb , -f. The switching magnet Tr is excited by the ^ contact, the. through the pulse contact tr ₄ the circuit for the pulse relay / opens, so that the switching magnet Tr in turn is de-excited again by I _1. As soon as Tr drops, the contact tr _t is closed again, so that the / relay. is aroused again. This progression of the stepping mechanism continues until the voters have come to the rest position and the contact tr _{± is moved} from the position denoted by b to the position indicated by α. The resistors W ₂ and W ₃ are dimensioned in such a way that the / relay enters the circuit -, tr _s , J ₀ , /, J ₂ , tr _it U ₁ , W ₂ , W ₃ , V ₃ , + or after the F relay has dropped v _s , h _& , J ₅ , tr _la , + cannot pick up.

Shortly after the return of the stepping mechanism, only the release-delayed F-relays are kept. The F-relays hold the S-relays (-, Sn, S ₁ , V ₁ , +) via the ^ -contact, which also due to their own drop-out delay, after the F-relays drop out, the circuit for the busy signal B (- , B, W _s , V ₉ , k _s , A ₃ , J ₅ , tr _la , +) and which also block the stations _{through the j 5 contact.} The drop-out delay of the F and 5 relays is used once to compensate for the difference in the switch-back times of the stepping mechanisms, which of course must be different since the stepping mechanisms are switched back to the rest position independently of one another.

Due to the drop-out delay of the F and 5 relays, however, it is also the lowest Means to reach out to create preferred participants who focus on the others in front of the others Company management that becomes free can switch by the fact that the delay times the F and S relays can be varied.

If a subscriber is to be selected via an exchange connection by the calling subscriber triggered series of current impulses, which act on the dialing devices of the office, it must be prevented that these series of current impulses act on the stepping devices no of the company line system. This is here for example, by 'an official contact tr reaches _3, which is open to the choice of the trunk line in all walks relay stations, so that the projection switching magnet Tr can not be affected by the subsequent pulse trains.

Claims (7)

Patent claims: i. Circuit arrangement for telephone systems with several on a common line lying branch points, thereby characterized in that switching means are provided, whereby each participant several branch points assigned to the same company management, which by themselves cannot be connected to the occupied company management, one after the other can call and communicate with them at the same time. 2. Circuit arrangement according to claim i, ίο characterized by a relay arrangement (K ₁ S) provided in each station, which has the effect that to a connection established in a known manner between any two subscribers of a company line t5 any number of participants from the same company management can be added by the calling subscriber without disconnecting the existing connection will. ao 3. Circuit arrangement according to claims ι and 2, characterized by a relay arrangement (F, S) which causes preferred subscribers to switch to the company line becoming free before the other subscribers. 4. Circuit arrangement according to claims ι and 2, characterized by a contact device (tr _s ), which has the effect that after the choice of certain codes, for example to call the office or a second company line, further impulses of the calling subscriber in the own company line system are ineffective . 5. Circuit arrangement according to claims ι and 2, characterized in that after the end of the conversation the return of the dialing devices assigned to the individual participants (Tr) is caused by a current pulse over the company lines which lasts longer than the setting pulses. 6. Circuit arrangement for telecommunications, in particular telephone systems with several Junction points which can be called optionally and are located on a common line, characterized in that switching devices are provided which the branch points when a connection is terminated even after the dialing devices have returned temporarily lock in the rest position. ' 7. Circuit arrangement according to claim 6, characterized in that the switching devices (S, V) effecting the temporary blocking are switched on upon the individual return of the selection devices influenced by a triggering stimulus. For this purpose χ sheet of drawings