DE646029C - Circuit arrangement for telecommunication, especially telephone systems with company lines - Google Patents

Description

The invention relates to a circuit arrangement for telecommunications, in particular telephone systems with company lines, in which when a connection is initiated, the voters at the branch offices of the company management can be set to the contact of the calling party, e.g. B. to the calling station in the exchange mark. However, this results in callback connections, i. H. for connections . between two participants of the same company management, the difficulty, the connection of the calling party to maintain when the switching mechanisms on contact of the desired subscriber.

Arrangements are already known in which the switching mechanism of the calling subscriber further voting is no longer influenced at all; but there are special switching devices at the exchange and at the subscriber stations necessary. It is also known to have a special one from a central point Connection relay at the calling point to influence which one is to connect this Maintains position regardless of the further setting of the switchgear .. Here but is a permanent influence on this connection relay from the central office (ZS supply) required. These disadvantages are caused by the arrangement according to the invention thereby avoided that on the off. Branch facilities are provided, which the local holding circuit a after the identification of an internal connection, the connection relay is switched on as a function of closed by the length of time the dial remains in the zero position hold or open, • The connection relay itself is advantageously used to maintain the connection or cancel. In the accompanying drawing, an embodiment of the invention is shown to which the However, the invention is not limited.

Several branch points are located on a common line GL , of which only the points TSf ₁ and TSt _{3 are} shown. The subscriber stations can optionally be called from a manually operated exchange VSt . The choice is made by setting the voters (D ₁ , D ₃ , etc.), the z. B. stepper mechanisms can be. In addition to the dialers, only one relay P is provided at the subscriber stations designed as 05 stations, which enables the callback to a subscriber on your own line (internal traffic). There is secret traffic on the company's management

* ') The patent seeker stated as the inventor:

Dipl.-Ing. Eduard Wochinger in Berlin.

secured. The busy line can be indicated by a flag connected to the switchgear at the subscriber stations. Since, apart from the microphone batteries, only inductors or similar power generators are provided as power sources at the participants, the question of the power supply for such systems is irrelevant. The systems are therefore particularly suitable for areas in which the supply of electricity is difficult.

The mode of operation of the arrangement shown in the exemplary embodiment is as follows- measure:

Outgoing connections

If a participant (e.g. TSt ₁ ) wants to call the exchange when the company management is free, he actuates his power generator (e.g. crank inductor) J ₁ and pushes the RT ₁ key. This button can be directly connected to the inductor in a known manner and automatically turned over when the inductor is turned. The generated alternating current brings the drop flap FK ₁ in the switching center to waste and makes the officer in the switching center aware of the presence of a call. The officer puts her interrogation plug into the jack AK of the calling company management and asks. Since the call can originate from any subscriber station on the company line, the calling subscriber must first name his own call number. The presses on that. The officer presses the subscriber key assigned to the calling station (in the present case T ₁ ), turns the selection key WT and switches on her power source Q (e.g. crank inductor). The electricity generated in this way is used to set the switchgear at the branch points to the contact of the calling station. In order to ensure a safe setting of the switchgear, it is ensured that the electricity generated is only connected to the company line when it has reached the required voltage. The arrangement is such that current is only switched on to the fr wire of the company line when the delay relay V responds and its contact ι ν closes. The following circuit is then formed: earth, current source Q, contact 2W, contact iv, rotary magnet DV, earth or & -Ader of the company line, in parallel through the rotary magnets D ₁ , D ₃ etc. at all branch points, earth. The rotary magnets respond to fio and move the switching mechanisms from the zero position to the i position. As a result of the response of the rotary magnet DV in the exchange, the relay W is switched on in parallel to the rotary magnet in the exchange via the contact 4dv. This responds and opens the contact 2 w, is interrupted causing the circuit for the rotary magnets, while a circuit for the trapdoor FK ₂ geschlo "by closing the contact 3" - is sen as is pressed into the exchange, the T ₁ key. The drop flap FK falls and thus gives the officer in the switching center to recognize that the switchgear has reached the contact identifying the calling station. The officer therefore stops operating the inductor.

If the subscriber had not called TSt ₁ , but z. B. the participant of the position TSt ₃ , the officer would have pressed the button T ₃ , and it would not have closed a circuit for the drop flap FK _{2 until switching position 3 is reached.} In this case, when the switching mechanism DV is set to contact position 1, the circuit for the drop flap FK ₂ prepared via contact 3 w does not materialize, so that after some time the rotary magnet of the switching mechanism DV falls off and contact 4 iv opens Relay W drops; contact 2w is therefore closed again, and since the officer continues to operate her inductor, current flows again to the rotary magnets DV and via the ib wire of the company line to the rotary magnets at the branch points. The switching values move one step further to contact position 2. This game is repeated until the circuit for the drop flap FK _{2 is} closed when the contact position 3 is reached via the rotary arm ζάν and the pressed button T _3.

By setting the switching mechanisms on the contact of the calling subscriber is only this participant is connected to the company management. The secret traffic is so secured. This arrangement also makes it possible to count calls or the like. to be carried out for the participants in the company's management.

If the calling subscriber wants a connection to another subscriber in the exchange, the officer establishes this connection in a known manner using a connection plug. At the end of the connection, the subscribers give a final signal to the switching center in a known manner, or the switching officer monitors by listening in to determine whether the line is still being spoken. When the conversation is over, she presses her release button AT, which causes levers AT ₁ and

AT _{2 get} into the working position. This actuation of the release button triggers the subscriber button T ₁ mechanically coupled in a known manner to the release button in the exchange. The officer now operates her power generator Q again, which in the same way as when setting the switchgear (when initiating a connection) generates current surges on the & veins

ίο sent to the company management and the switchgear at the branch points are gradually moved on. The transmission of the current surges lasts until all switching mechanisms reach the zero position. If the switching mechanism of the exchange is in the zero position, the contact in. Rotary arm 5 dv in the zero position and key ^ T ₁ creates a circuit for the drop flap FK ₂ , whereby this falls off and the officer can see that the zero position of the switching mechanism has been reached. The officer therefore shuts down the generator Q.

Incoming connections

If the civil servant in the exchange wants to call a subscriber in the company management by herself, she presses the key assigned to the desired subscriber, for example T ₃ , actuates the selection key WT and then activates her generator Q ; it waits until the flap FK ₂ falls, whereby it receives the signal that the voters are set to contact the subscriber they want. She then presses her call button · RT without switching off the power generator , which triggers the WT dial button mechanically coupled to this button. The relay V therefore drops out and switches off the current from the rotary magnet by opening its contact ι ν. The current now flows solely over the α wire of the company line to the subscriber station TSt ₃ , rotary arm 6 d _s in position 3, call button ΑΓ ₃ in rest position, hook switch HU ₃ , alarm clock Wk ₃ , rotary arm γά ₃ , earth. The alarm clock for the desired station rings until the participant switches it off by picking up the receiver. The conversation can now take place. The connection is released at the end as with an outgoing connection.

Internal connections

The subscriber at the station TSt ₁ , who has called the exchange in the manner already described, does not now, as described above, want a connection to another subscriber in the exchange, but to a subscriber of the company's own management. In order to call this subscriber, the switching mechanisms must be set to the contact assigned to this subscriber. If the switching mechanisms were adjusted, the calling subscriber would now be switched off. To avoid this, a relay P is provided, which is energized with an internal connection and bridges the rotary arm of the switching mechanism so that it no longer needs to remain set to the call contact. After having learned that the subscriber at the station TvSY _1, for example, the subscriber at the station TSt ₃ , the officer in the exchange switches the power generator to the α-wire of the company line by pressing her call button RT, which in the calling station a circuit for the relay P ₁ is established. Earth, power source Q, call button RT, α-wire of the company line to subscriber station TSt ₁ , rotary arm 8 O ₁ in position 1, call button RT ₁ , hook switch HU ₁ in working position, transmitter Ue ₁ , remote _{receiver P 1} , rotary arm ^ d ₁ in Position i, ReIaIsP ₁ (winding I), earth. Relay P ₁ responds and closes the contact 10 ^ ₁ , whereby its winding I is short-circuited; it also closes the contact 11 P ₁ , whereby the winding II of the relay P _{1 is switched on} in a circuit of the microphone battery B ₁ . The relay P ₁ stays in this circuit as long as the receiver is lifted and the switching mechanism is not in the zero position. Via contact 12 P ₁ of the participants in place TSt ₁ to the α-wire line of the company is now connected, irrespective of which step the rotating arm 8 α \ is set.

In the exchange, the officer too releases the call button RT after a short time and presses the button T _{3 of} the desired subscriber at the station TSt ₃ . It further defines the selection key to WT and thus effected in the manner already described the setting i 5 ° of the switching works at all branch points at position 3. The trapdoor FK% then drops and the official indicates the setting of the derailleurs. In the manner already described, the officer now calls the desired subscriber by pressing »10 of her call button RT. If this answers, the connection is established and the operator pulls her interrogation plug from the AK jack of the company management. With this, the drop flap FK _{1 is} again connected to the α-wire of the company management and is now used for call monitoring by the operator (e.g. for the final signal).

When the conversation ends, both participants or one of them give a final signal

by activating his generator /. The drop flap J-Vv ₁ in the exchange therefore drops out. The operator queries and, in the manner already described, causes the switching mechanisms to be reset to the zero position if none of the subscribers respond.

It is conceivable that when subscriber TSt ₁ has called subscriber TSt ₃ , the> ° subscriber TSt ₃ gives the final signal and hangs up his receiver, while subscriber TSf ₁ forgets to hang up his receiver or deliberately does not hang up his receiver in order to remain connected to the company management and to listen in on the next connection in an inadmissible manner. Such unauthorized eavesdropping is prevented and thus the secret traffic on the company management is absolutely guaranteed, since the relay P ₁ , as soon as the switching mechanism reaches the zero position, is _{short-circuited via the rotary arm Ij (Z 1.} If the switching mechanism remains in the zero position for some time, as is the case when a connection is released, the relay P ₁ drops out and opens its contacts T-Op ₁ and 12 P ₁ , so that the subscriber, even if he still does not hang up his phone, is from the company management is switched off.

If the subscriber at the station TSt ₃ wants to call the subscriber at the station _{TSt 1} , the switching mechanism must be switched on beyond the zero position in order to be set to the contact of the person to be called. As already described, the subscriber at station TSt ₃ first calls the switching center, is queried by it, whereupon the switchgears in all branching points are brought to the contact of the calling subscriber, i.e. to position 3, in the manner already explained by the officer will. If the calling subscriber now informs the operator that he wants to be connected to a subscriber on his own line, the same processes take place in the exchange as with an outgoing connection from the subscriber at station TSt _1; that is, the officer presses the call button and thus switches the current source Q to the α-wire of the company line, which causes the relay P _{3 to respond in the subscriber station TvSi 3} : Earth, power source O, button RT, α-wire of the company line to the subscriber station TSt ₃ , rotary arm 6d ₃ in position ^, call button RT ₃ , hook switch HU ₃ in working position, transmitter Ue ₃ , remote _{receiver F 3} , rotary arm 14 ^ ₃ in position 3, relay P ₃ (winding I), earth. Relay P ₃ responds and remains in the microphone circuit via its winding II and contact i $ p ₃ - Furthermore, contact 16 p _{3 is} closed and thus the rotary arm 6 d _{s is} bridged. Now the operator presses the key T _{1 of} the desired subscriber, she also presses the dial key, so that now, in the manner already explained above, current impulses are sent over the i> wires of the company line to adjust the voters at the branch points affects the switching mechanism DV in the exchange, which controls the current impulse.

Since the establishment of the desired connection involves a connection between the calling subscriber at the point TSt _t and the desired subscriber at the point TSt ₁ , it is necessary to switch the switching mechanisms set to position 3 beyond the zero position into position 1 without that now, however, when the zero position is exceeded, difficulties arise in establishing the connection. Such difficulties do not arise in the exchange, since the switching mechanism DV works with the relay W in self-interrupting circuit until the rotating arm ζάν checks for a contact as it rotates, which is connected to a pressed button and thus to earth. Since only the release button AT indicates the zero position when resetting, but this button is not pressed, the switching mechanism in the exchange runs until the rotary arm 5 dv actually hits the contact 1 indicated by the button T _1. Then the drop flap FK ₂ falls.

In the branch points, when the zero position is reached, the relay P _{3 is} short-circuited _{by the rotary arm 17J 3} which has moved into the zero position. Since it is a connection between a subscriber with a higher connection number (3) and a subscriber with a lower connection number (1) callback connection, the relay P _{3 must} not drop out and cancel the connection of the calling subscriber to the company line. Switching devices are therefore provided at the branch points which keep the local holding circuit of the connection relay P , which is switched on after a callback connection has been identified, closed for a certain period of time depending on the length of time the dialing device remains in the zero position. If this pause is only short (corresponding to the pause between two switching steps), this time is not sufficient to cause _{the relay P in the calling station to drop out, as this relay is via its winding I (through contact 1Sp 3} ) or over its winding II (over

Contact 15 ^ ₃ and rotary arm 17J ₃ ) is short-circuited. But if the pause is longer, such as B. after the end of a connection, the relay P comes to waste. In the event of a callback connection, the relay P therefore remains energized and, after the switching mechanism has left the zero position again, continues to be in the microphone circuit. The further processes are now the same as already described, ie the desired subscriber is called by the operator and, when he has reported, the interrogation plug is pulled out of the jack AK in the exchange. The conversation takes place and is also ended and triggered in the manner already explained. .

The power sources in the exchange and at the subscriber stations are in

ao the embodiment crank inductors or similar arrangements are provided. If direct current is to serve as dialing and ringing current, these current sources can also be used as direct current generators

«5, either by providing commutators on the inductors, which enable the emission of direct current, or electrical valves (rectifiers) can be arranged in series with the inductors, which only allow current to pass in one direction. It is also possible, instead of the relay V in the exchange, which only switches on the alternating current after the generator has been in operation for some time and has reached its correct voltage, to arrange a regulator on the shaft of the inductor, which controls the inductor generated current is only switched on to the line when the inductor has reached a certain speed.

Claims (7)

Patent claims: i. Circuit arrangement for telecommunications, in particular telephone systems with company lines, in which, when a connection is initiated, the voters at the branch points of the company line are set to the contact of the calling point, characterized in that devices (switching arm 13Ci ₁ , 17 d _s ; KorrfaKte Hf ₁₁ 15 Ps) are provided, which -, keep the local holding circuit of a switched-on relay (P) switched on after a callback connection has been identified, depending on the length of the stay of the dialing device (D ₁ , D ₂ ) in the zero position or open. 2. Circuit arrangement according to claim i, characterized in that the connection relay (P) itself maintains or cancels the connection. 3. Circuit arrangement according to claim i, characterized in that the connection relay (P) in the zero position of the selection device under the influence a time switch device drops out with a delay. 4. Circuit arrangement according to claim 3, characterized in that when the connection relay (P) is energized, its holding winding (winding II) is in the zero position the dialer is short-circuited. 5. Circuit arrangement according to claim 3, characterized in that the holding winding of the connection relay (P), which works with delayed armature dropout is short-circuited in the zero position of the dialing device. 6. Circuit arrangement according to claim i, characterized in that the Connection relay (P) when the dialing device is briefly in the zero position remains in the working position, but falls away if the electoral system remains there for a long time. 7. Circuit arrangement according to spoke i, characterized in that Switching means (11 / Ί, 13 ^ 1) at the branch points the connection of a calling branch point to the company management by means of an after identification a callback connection excited, held in a local circuit Maintain the connection relay (P) while the callback connection is being established, even when the selector is in the zero position. 1 sheet of drawings