DE612232C - Telegraph exchange system with dialer operation - Google Patents

Description

GERMAN EMPIRE

ISSUED ON April 17, 1935

REICH PATENT OFFICE

PATENT LETTERING

CLASS 21 a «. GROUP 5

104,614. VIII a]

Siemens & Halske Akt.-Ges. in Berlin-Siemensstadt *) Telex exchange with dialer operation

Patented in the German Empire on May 15, 1932

The invention relates to telex switching systems with dialer operation, in which the telegraph subscriber lines at the office with telegraphic relay converter circuits are switched off. In the known telex exchanges of this type, the assignment of the office as well if necessary, the triggering of the free choice is controlled by a call relay that is in the idle state is on the subscriber line and after the office has been occupied or after Termination of free choice is switched off. With this shutdown of the call relay takes place at the same time by connecting the relay converter circuits to the subscriber line the establishment of the operating status required for the transmission of telegraph characters the subscriber loop and, depending on this, the remote activation of the drive motor of the subscriber set. the then the following, given by the calling subscriber by means of the dial Voting impulses for setting the voters in the exchange are in the same Transmitted in the same way as the telegraph impulses, i. H. they also run over in office the telegraph circuits as well as those provided for the transmission of the telegraph characters Relay converter circuits up to the pulse relay of the respective selected level.

A similar mode of operation also exists with certain telex switching systems, to connect the calling subscriber to the to establish the connection telex exchange provided with the desired telex subscriber first operate an intermediate dial via a telephone exchange. This is also the case here Call relay of the telephone exchange, which is in the idle state on the subscriber line, switched off when establishing the connection, so that after the controlled via the telephone exchange Switching of the calling subscriber line to the telex exchange only the one provided in this Relay converter circuit is on the line.

Such circuits have the disadvantage that the dialing pulses in an undesirable manner affect the calling party's own receiver, since remote activation the subscriber set when the office is occupied or when the area code is terminated, d. H. that is, before the start of the actual election. There are already suggestions has been made to overcome the difficulties mentioned by the fact that special

*) The patent seeker stated as the inventor:

Otto Römer in Berlin-Siemensstadt,

Switching means within the subscriber station either influencing the receiver prevent through the individual election impulses or an imprint of during the election Make characters impossible. However, these funds are either unreliable or demanding the use of special power sources at the subscriber station.

The invention is therefore based on the idea that it is better to use additional To avoid switching means at the subscriber station and instead the elimination of the explained defect by a new mode of operation of the switching devices in the To reach switching center. The main feature of the invention is that the lying on the subscriber line in the idle state, during telegraphic traffic switched off call relay while dialing as a pulse relay to pass on the Dialing pulses and the connection of the relay converter circuit to the subscriber line only takes place after the election has ended.

It is true for automatic telephone exchanges of a certain type already known via a special circuit formed from the subscriber line and earth to control a relay, which first initiates the free choice and then the dialing impulses transmits, but in this case the relay is used at the same time for the call and for the dialing impulse under completely different conditions than with of the invention, which can already be seen from the fact that the relay is also used during subscriber traffic remains switched on. For the invention, however, as already said, the special task is that during the telegraphic traffic a telegraphic relay converter circuit instead of the call relay is connected to the subscriber line and that the necessary switching takes place in such a way, that a disruptive influence on the recipient at the calling subscriber is largely avoided by the election impulses. For this task is mentioned in the known circuit does not contain any possible solution.

The idea of the invention can expediently be carried out in this way that the disconnection of the idle state on the subscriber line Call relay takes place when the connection to the calling subscriber is switched through. In the same moment can then also be used for the transmission of telegraphic. Characters required operating status of the subscriber loop of the calling subscriber and thereby its teleprinter can be switched on remotely. These Switching masses can advantageously be made dependent on a return pulse that when reaching the desired subscriber or when his connection line is assigned as Control pulse is transmitted in the direction of the calling party. The remote activation the drive motor in the calling subscriber station thus serves in a manner known per se as a symbol for the Reaching the called subscriber. In order to also have a control over it have that the right subscriber has actually been called can be a per se known feedback device are put into action, which is the desired participant assigned identifier transmitted to the calling subscriber. aside from that Precautions can be taken already when the office is occupied, when it is terminated allow free choice and, upon reaching the individual electoral levels, a control of the connection status achieved in each case. Acoustic or optical signaling means known per se can be used for this purpose find that are to be installed in the subscriber station and controlled by control pulses from the exchange will.

Further details of the invention can be found in the drawing and the description below refer to.

Fig. Ι shows a telex switching system as an embodiment of the invention with dialer operation, in which the subscriber line is de-energized in the idle state is, Fig. 2. a corresponding circuit, but with closed-circuit current monitoring. In both cases, only those were used for explanation of the invention shown essential parts of the circuit and of the various Dialing levels of the switching office only indicated the preselection level, as the circuit the other elective levels, d. H. in particular those of the group and line voters, can be carried out in a known manner.

In Fig. Ι the circuit of a subscriber station is shown on the left, by the dash-dotted line, which is connected to the connection circuit of the exchange via a double line. If the subscriber wishes to establish a connection, he first presses the on button ET, which. is held in the depressed position, and thereby closes a direct current circuit for the call relay K arranged in the exchange, which in turn switches on the delayed relay R via the contact Ji ₁ and switches the contact k ₂ preparatory iao. The · relay R stimulates the selection VW via the contact r _s , like this

that this continues to run until he has found a free connection line to the next election level. At this moment, a circuit for the test relay T closes via the test wire c in a known manner, which is connected to a holding circuit via its own contact i ₃ and contact r _± with the rotary magnet DV being switched off. The contacts t _t and t ₂ switch the α-wire and the 6-wire through, the contact J ₄ closes a circuit for the left winding of the = polarized relay ER via the resistor W ₁ , so that its contact is out of the wrong rest position goes into the separating layer. The contact t ₅ prepares a response circuit for the relay X.

With the now following choice, by pressing the pulse contact i by means of the dial, pulse-like interruptions

^ao openings of the subscriber loop generated and transmitted via the call relay K to the contact k ₂ , which transmits the pulses as double- current pulses via the contact arm va of the preselector and the line «to the next dialing stage. An influencing of the relay R during the dialing is avoided by its' drop-out delay. The relay ER also remains inactive, since it is still switched off by the subscriber loop.

When the desired participant is reached, a return pulse is sent back in the manner to be explained, which arrives via line b and contact arm vb of the preselector and is initially transmitted to direction- sensitive delay relay V via the folded contact t _2. The relay V responds and closes an excitation circuit for the relay X via the contact V ₁ , which is now effective as a connection monitoring relay in a known manner while the connection is established. The contact ^ switches off the subscriber loop, but the relay K is prevented from being de-energized by the fact that the contact X ₂ closes a local circuit for the relay K. After the contact v _% has been opened, the relay R is retained via its own contact r _s . The contact X ₁ prepares the connection of the operational

5.0 moderate subscriber loop, which is immediately completed by the polarized relay SR moving its armature ir from the wrong rest position to the separating position when the contact x _{s is opened.}

Only now is the polarized switch-on relay E reversed in the station of the calling subscriber, since instead of battery half B _1, the other battery half B _{2 is} connected to the subscriber line with opposite polarity. The contact e applies the high-voltage relay U to the network N, so that the drive motor M is switched on via the contacts U ₂ and u _a. At the same time, the contact U _{1 is turned over} , which cancels the short circuit existing in the idle state for the receiving magnet EM and the transmitting contact SK and bridges the switch ET , so that it can now be reset. This resetting of the switch-on button can, for example, inevitably take place by energizing the relay U or, in the manner shown, by the switch-off button AT, which is pressed after the traffic has ended, or also by a special release button. Finally, the release of the power button can also z. B. be done mechanically depending on the start of the drive motor or the commissioning of the transmitter keypad. It is also useful to delay the switching of the contact U ₁ in the manner already proposed, so that incorrect pulse generation when the drive motor starts up is prevented.

In the connection circuit of the desired subscriber, the test relay T is switched on via the line c ' coming from the line selector and the resistor Wi _{, which with its contacts ^ 1} and t ₂ switches through the lines b' and a ' coming from the line selector, with contact # ₄ in the manner described above it causes the reversal of the contact and by closing the contact _s t a circuit for the relay X prepared. When the contact t ₂ is moved, the direction-sensitive delay relay V is activated, since there is a positive potential on the line a 'coming from the line selector. The relay X is now switched on via the contact V ₁ , while the contacts ^ ^and d ^v s are switched over in preparation. Upon response of the relay X of the contact is switched on the relay x ₂ K by closing, with its contact k ₂ coming from the line selector line V from the negative terminal of the battery to the fulcrum of the armature it switches. Since the anchor has been placed on the positive pole of the battery, the current direction is reversed in line b ' , which as a return pulse in the manner explained above results in the calling subscriber being switched on remotely. In addition, the contact k _{t is} closed, but the relay R remains de-energized because the contact V _{3 was} previously opened. When the contact x _s is opened, the polarized relay SR responds, so that the contact sr goes from the wrong rest position to the separating position and connects the battery B ₂ to the double line leading to the desired subscriber via the contact which has already been turned over.

012232

Here, a switch-on pulse runs across the capacitor bridging the switch-on button ET, so that the polarized switch-on relay B is reversed and the station is switched on remotely in the manner described. The contact U ₁ bridges the capacitor that is parallel to the ON button ET and thus closes the direct current circuit required to transmit the telegraph characters.

After the telegraphic traffic has ended, one of the two participants presses the switch-off button AT and thereby makes the participant loop de-energized for a longer time compared to the telegraphic pulses, so that the delay relay X can drop out. In this way, the restoration of the idle state of the circuit is brought about in a manner that can be readily seen from the circuit diagram.

The embodiment according to FIG. 2 differs from the one just described essentially in that the subscriber loop is traversed by a weak current even in the idle state, which enables the automatic readiness control of the call switching means located in the subscriber loop. It is also indicated how the polarized switch-on relay E can be replaced by a neutral relay U in conjunction with a known valve circuit.

In the idle state, a current flows from the battery B ₁ through the call relay K in the exchange and the relay U in the subscriber station. This quiescent current is _{allowed through by the rectifier G 1} , but blocked by the rectifier G _2. The relay U is thus energized and the contact U ₁ is closed, while the contacts M ₂ and% are open. Likewise, the contacts k _u k ₂ and h _a in the exchange are not in the rest position shown, but in the opposite working position.

When you press the ON button ET , the high.oh.mige winding of the relay U , which is in relation to this paraEel, is also switched into the closed circuit, so that the relay U continues to hold, but the relay K in the exchange comes down as a result of the weakening of the current . The contacts L and k _s are switched over in preparation, while the contact k _t switches on the winding II of the relay R via the normally closed contact I ₁ , which in turn stimulates the preselector in a known manner and the contact r ₄ in the line l coming from the line selector ' as well as the contact r ₃ in the circuit of the relays L and V (winding II) in preparation.

When the "test relay T _{" responds,} the preselector is stopped by switching the contact t a and the holding circuit for the test relay Γ is closed; the lines α and & are switched through via the "contacts ti and # ₂ , the contact t _s prepares a circuit across the. Resistance W% before, while the contact t _s closes a circuit via the resistor W ₁ , the winding I of the relay R and the left winding of the polarized relay ER. , This is the contact he reversed from the wrong position of rest in the separating layer, however, this switching measure initially no further consequences, since the contact V is still in the rest position. ₁ .

The mentioned circuit for the left winding of the relay egg? also contains the winding I of the relay R, namely the field effect of the current flowing through this winding is opposite to the field effect of the current through the winding II, but only half as large, so that the relay R remains attracted even after the winding I is switched on . This. The state only exists as long as the ON button ET is pressed and the relay. Jf is de-energized. If the switch-on button is released again, the relay K responds again and short-circuits the winding I of the relay R with the contact k _&. At the same time, the current flowing through the winding II is reduced to about half the value by the excitation current for this winding via the resistor W ₃ and the contact t ₅ after the switching of the contact Iz ₁ . runs. In addition, the switching of the contact "k _x results in the response of the relay L, while the relay V receives only a weak premagnetization via its winding II and the resistor W ₆ , which is insufficient to respond. The relay L closes via the contact I ₁ Holding circuit, which makes the response state of the relay independent of the position of the contact Tz _1. The contact I ₂ switches the line a of the preselector through to the pivot point of the armature fcj, so that the number given by the number pulse contact i of the "subscriber" turns out to be impulsive de-excitations of the relay K effecting dialing pulses are transmitted as double current pulses via the line α to the following dialing stages through the contact fe _{2 going back and forth.}

The return pulse that returns when the desired subscriber line is reached controls the polarized relay SR and the direction-sensitive delay relay V (winding I) via the line & so that by switching the contacts ir and -w _a -the telegraph circuit

Claims (1)

produced for the subscriber loop and by de-energizing the relay U in the subscriber station, the remote switch-on of the device is brought about. The contact V ₁ switches the line to the pivot point of the armature , which is now the telegraph impulse; has to transfer. The connection is released by pressing and holding the switch-off button ίο AT and proceeds in a manner that is readily apparent from the circuit. It should be mentioned, however, that the triggering of the connection devices in each case starts from the relay R of the calling subscriber, in that a circuit for the winding I of the relay R is initially closed by returning the armature sr to the incorrect rest position and thus the relay is brought down by counter magnetization, since the winding II in series with the resistor W _{3 has} about the same but opposite field effect as the winding I. The circuit of the direction- sensitive delay relay V shown in FIG. 2 has the advantage over the circuit according to FIG. 1 of greater freedom from distortion, since the course of the current rise curve can be made the same for both current directions by a suitable choice of the resistor W _7. As a first approximation, the resistor W ₇ can simulate the ohmic resistance of the relay winding I of the relay V , but the simulation can also be extended to the impedance. The mode of operation is such that as a result of the valve action of the rectifiers G ₃ or G ₄ connected in parallel, depending on the direction of the current, essentially either only the relay winding or only the equivalent resistor represents a current consumer. By means of a capacitor connected in parallel to the arrangement (as shown), a taxing effect in the manner of a Maxwellerde can be exerted on the characters to be received by the relay SR. Patent approach: i. Telegraph switching system with dialer operation, in which the telegraph subscriber lines are provided at the office with telegraphic relay converter circuits, the connection of which to the subscriber line at the same time causes the subscriber set to be put into operation when the connection is established, characterized in that the call relay which is in the idle state on the subscriber line and is switched off during telegraphic traffic (K) serves as a pulse relay during the election to pass on the dialing pulses and the relay converter circuit is only connected to the subscriber line after the election has ended. 2. System according to claim i, "characterized in that the disconnection of the call relay (K) takes place from the subscriber line when the connection to the called subscriber is switched through. 3. System according to claim 1 and 2, characterized in that the disconnection of the call relay (K) is triggered by the subscriber line by a return pulse which is transmitted as a control pulse in the direction of the calling subscriber when the connection to the called subscriber is switched through. 4. System according to claim 1 to 3, characterized in that the disconnection of the call relay (K) from the subscriber line takes place simultaneously with the establishment of the operating state of the subscriber loop required for the transmission of telegraph characters. 5. System according to claim 4, characterized in that the disconnection of the call relay (K) from the subscriber line takes place at the same time as the connection of the relay converter (.Ei ?, SR) provided for the mutual transmission of telegraph characters. 6. System according to claim r to 5, characterized in that when the connection to the called subscriber is switched through at the same time as the disconnection of the call relay (K) assigned to the calling subscriber from the subscriber line, the current direction reversal required to remotely switch on the subscriber set takes place in the subscriber loop. 7. Plant according to claim 5, characterized in that for the receiving relay (ER) of the relay converter assigned to the calling subscriber, which is only switched on when the connection to the called subscriber is switched through to the line of the calling subscriber, already when the connection is initiated when occupying of the office becoming effective switching means (t _t ) an excitation state corresponding to the operating state is established. 8. Plant according to claim 1, characterized in that the occupancy of the office and optionally the starting of the preselector controlling delay relay (R) is in a local circuit, which is caused by the idle state on the Subscriber line lying, when the connection is established, the dialing pulse transmitting call relay (K) is controlled. 9. Plant according to claim, characterized in that the delay relay (R) has two windings (I, II) which counteract each other magnetically and are connected so that when the connection is triggered, the relay drop is brought about by counter magnetization. 10. Plant according to claim 9, characterized in that one of the windings (I) lies in a circuit controlled by the contact (sr) of a telegraph relay (SR) which, after the connection has been established, is only energized during the transmission of a character pulse. υ. System according to Claim 1, characterized in that mechanical or electrical means are provided in the subscriber station which maintain the switching state of the subscriber loop corresponding to the pressing of the ON button (ET) until the return pulse is received when the called subscriber is reached, and the activation of the ON relay (U) prevent. 12. System according to claim 11, characterized in that mechanical or electrical means are provided in the subscriber station which lock the switch-on relay (U) in the pre-existing position when the switch-on button (ET) is actuated. 13. System according to claim 1, characterized in that the in the circuit of the winding of a telegraph relay (SR) , serving for connection monitoring, the current direction-sensitive delay relay (V) with two rectifiers acting as valves, preferably dry rectifiers (G ₃ , G ₄ ), and one the resistance of the relay winding (F, winding I) simulating the equivalent resistance (W ₇ ) is interconnected in such a way that, depending on the direction of current, either the relay winding or the replacement resistor acts as a power consumer. 14. Plant according to claim 13, characterized in that a parallel capacitor is intended to achieve a steepening of the characters to be transmitted in the manner of a Maxwellerde. 1 sheet of drawings