DE187078C - - Google Patents

Description

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WiUJiH ₁₁ S-Jr:

IMPERIAL

PATENT OFFICE.

PATENT LETTERING

VIl 87078 ■ CLASS 21 α. GROUP

SIEMENS & HALSKE AKT-GES. in Berlin.

for the called subscriber.

Patented in the German Empire on October 28, 1903 .

The present invention is a circuit arrangement for the traffic between two telephone switching offices where the call is made from the exchange, and the connection through automatic monitoring - resp. Final signal controlled will.

With the circuits that have hitherto been customary for such offices, operation is general as follows. The first exchange calls the desired subscriber, and then the The connection should only be canceled when both final characters have appeared are the final character of the calling party but, which is mainly decisive for the ending of the conversation, appears in the first office, so it is here too the connection is disconnected first and thus the second office is given a corresponding sign

given so that the connection can also be canceled there.

The above-mentioned facility, that is to say, the forwarding and the monitoring the connection is made by the first office, but has the disadvantage that the arrangement of the central battery for supply of the called subscriber in the second office offers difficulties and also the officer of the first office very much is heavily used.

In order to partially relieve this officer, one has that with more or less success so-called service system applied, in which the officer of the first office notifies the second office of the connections required.

According to the present invention, the object is the paging through the trunk lines as well as avoiding the additional burden on the civil servant of the first office without using special reporting lines, thereby solved that the calling of the requested subscriber and the monitoring of the connection of the officer of the second Office is assigned.

However, this solution implies overcoming another difficulty. If namely, as is the case with the circuits commonly used up to now, that The final character of the called subscriber appears first on the second office alone, until the first office has broken the connection, the officer in the second office could easily misled, it could be the sole appearance of the final sign of the second Misunderstand the participant and assume that he has not yet contacted him, call again. The transfer of the supervision of the connection to the officer of the second office is according to the present invention thereby made possible that this officer gives the closing signal of the calling subscriber is transmitted automatically.

A transmission of the monitoring character assigned to the called subscriber one can go from second office to first

Easily perform in a known manner. It is different with the transmission of the final signal of the calling subscriber from the first office to the second, namely here still Care must be taken that the first office to transfer the final character Switching does not cause a disruption of the operation, even if the connection is carried out in the first office alone can. According to the present invention, the latter takes place in such a way that the one assigned to the interrogation plug in the first office End signal electromagnet a switch on the side of the connecting plug of the associated pair of cords so that when the test plug in a The exchange connection line is plugged in, and the final signaling is possible via this to the second exchange but if this plug is in a subscriber pawl is introduced, this switching neither the checking nor the signaling on the line of the called subscriber disturbs and does not change the operation in any way.

In Fig. Ι the accompanying drawing, an embodiment of the invention is shown. A device according to a known system with two-part parallel pawls is assumed for the two offices I and II. T ₁ and T ₂ designate two subscriber stations which are connected to the office I, T _s a subscriber station of the office II. In the drawing (Fig. 1) the two subscribers T ₁ and T _{3 are} in speech

Connection via the offices I and II and the trunk connection line i, 2 shown, namely the representation relates to the time at which the subscribers have given the final signal by attaching the listener. The firing devices, which have the effect that the tail lamps S ₁ , S ₂ and S ₃ do not light up in the idle state, as well as other ancillary devices, have been omitted from the drawing for the sake of clarity. The final signal of the calling subscriber T ₁ is transmitted here after Office II by energizing the final signal relay R ₁ arranged on this in such a way that during the duration of the conversation on branch 2 containing the relay R _{1 of} the connecting line 1, 2 on both offices the same batteries B ₂ and B _{2 are connected} against each other, on the other hand, when the final sign R _{2 is} de-energized at Office I, the voltage of battery B _{2 is changed} by switching on a larger battery B ₃ , so that a current is generated through relay R ₁ .

The individual circuits are as follows:

When the handset is suspended on the calling subscriber station T ₁ , a current flows from the battery B _{1 of} the office I via choke coil winding Dr ₁ , electromagnet R ₂ , line b, microphone of the calling subscriber T ₁ , line a, _{winding Dr 2} , battery B ₂ B ₁ back, R ₂ is excited, so that this firstly interrupts the circuit of the final sign S ₁ and secondly the 'battery B ₂ via the contacts K ₂ and K ₁ and the winding Dr _s with one line of the test plug and so when executed Connection is connected to branch 2 of the connection line. When the second office is plugged at m , a current flows from the battery B ₁ through the winding Dr ₄ , monitoring electromagnet R ₃ , line 1 and winding dr ₁ to earth, which energizes R ₃ and turns off the monitoring symbol S ₂ . The first office receives the signal that the second office has answered and does not need to monitor the connection. In the second office, battery b _{2 is} connected to line 2 via dr ₂ and R ₁ . b ₂ is of the same size as the battery B _{2 of} the first office and is connected in the opposite direction, so that no current can flow through R _{1 for the time being.} The officer of the second office calls subscriber T ₃ and monitors the connection. As long as the participant does not report go, the lamp S ₃ lights up. But takes the participants from his telephone, a current flows from b _x about dr i _{it? 4} , subscriber station T ₃ , dr ₃ and b _{2 back} to b ₁ . The batteries b ₁ and b ₂ , like B ₁ and B _2, are connected in opposition to one another. Since b _{1 has} a higher voltage than b ₂ , R _{4 is} now excited and switches S ₃ off. After the end of the conversation, the participants hang on their telephones, R ₂ and R ₁ are de-energized and cause the lamps S ₁ and S ₃ to light up. At the same time, R ₂ connects battery B ₃ in place of B. ₂ to line 2 via contacts K ₃ and K ₁ , whereby a current from B ₃ via K ₃ , K ₁ , Dr ₃ , line 2, R ₁ , dr ₂ , b ₂ and earth and so comes back to B _3. R ₁ is now excited because the electromotive force of B _{3 is} greater than that of b ₂ and switches on the final symbol S ₄ ; Office II separates the connection and thus interrupts the current path via the relay R ₃ , whereupon the latter _{switches on the character S 2} , so that the first office also receives both connection characters.

In Fig. 2, a second embodiment of the invention is shown. Since here compared to the arrangement according to FIG. 1 only the facility of Office I is changed, only this is redrawn. In this case, the excitation of the final signal electromagnet R ₁ is caused by the fact that after the final signal relay R ₂

A resistor W is connected to earth on the line 2 in question in Office I and a current path from the battery b ₂ connected to this line in Office II via the relay R ₁ and resistor W is formed. The fact that the electromagnet R _{s is connected} to the line i, the magnet R ₁ on the other hand to the line 2 and the _{changeover effected by JR 2 also} takes place on this line, has the effect that the changeover is only effective _{in the circuit of JR 1} because the circuits of the two magnets JR ₁ and jR ₃ are independent of each other. The current for the transmission of the final character of the calling subscriber can therefore _{not influence the final character S 2 of} the first office assigned to the second office, so that it could appear before the connection is disconnected on the second office.

The entire facility in Office I is set up in such a way that apart from Office II or other exchange stations also serve the subscribers connected to exchange I directly can be done with the same plug that is used for the Establishing the exchange connection via lines 1, 2 is used (cf. the dashed line connections shown in Fig. i).

The change in voltage, which respectively _{by the electromagnet JR 2} by switching the central battery B ₂ , B _a. is effected by switching on the resistor W , is brought by appropriate dimensioning of the battery J3 ₂ and B _3, especially with regard to B _1, to such an amount that the change in the circuit does not disturb or change the operation even if with the same pair of plugs a connection between the subscriber stations T ₁ and T _{2 of} the office I is carried out, as indicated in Fig. ι dotted. The desired effect of the termination signal transmission after the second office would also be achieved, for example, if the line 2 were grounded without a resistor W interposed. In the case of the connection between T 1 and T _{2 shown in FIG. 1,} however, this would interfere with operation, since line L would then be directly connected to earth and therefore the potential required for testing would not be maintained. Since, furthermore, the polarized call relay AR is to be put out of operation by the holding winding r , if the resistor W ceases to operate, the current of the battery JB ₂ instead of r would immediately flow through the earth connections. The batteries B ₂ and B _s respectively. B ₂ and the resistor W , however, are dimensioned so that when switching the voltage between the socket line and earth increases or respectively in such an amount. is reduced so that no significant difference is brought about in the test noise, and the holding current for the relay AR is sufficient in both cases to cause the relay to be securely held. An unsuitable dimensioning of the size ratio of the batteries B ₂ and J3 ₃ could also result in a disruption of the final signaling, since the current in the winding of the final signal electromagnet JR ₃ depends on the electromotive force existing between the plug lines. The correct arrangement and size of the batteries B ₂ and B ₃ has the consequence that when the calling subscriber T ₁ hangs up his phone first, the current in the winding of -R _{3 is} not changed so much by the switching that then takes place, that, for example, by dropping the anchor of R _3, an early appearance of the final signal of the called subscriber is brought about.

Since the operation is the same for a connection between two participants Office is designed in the same way as with communication over two offices, is the service much easier. , go

Claims (4)

Patent Claims: 1. Circuit arrangement for telephone traffic over two offices with automatic Final signaling, further call from the part of the office and monitoring signal for the called subscriber, characterized in that that the relay provided in the connection apparatus of the first office, which when the apparatus is used to connect two participants of this office the final signaling of the the participant lying on the interrogation plug causes, for connections over two offices is used to produce a closing character in the second office, so that the second office is the closing character of both participants receives. - ■■ 2. Embodiment according to claim 1, characterized in that the electromagnet (R ₂ ), which brings the final character of the calling subscriber (T ₁ ) to the first office (I) to respond, causes such a circuit change that thereby on the second office (II) caused by an electromagnet (R ₁ ) the appearance of the final character (SJ , but in the case of a connection between two participants (T ₁ , T ₂ ) of the same office (I) a disruptive influence on the final character (S ₂ ) of the called party Participant (T ₂ ) through the by the final signal electromagnet (R ₂ ) of the calling subscriber (T ₁ ) caused circuit change is avoided. 3. Embodiment according to claim 1 and 2, characterized in that the of the final sign electrpmagneten (R ₂ ) of the calling subscriber (T ₁ ) on the first office (I) switching of the circuit not to be carried out on the monitoring sign (S ₂ ) of the same pair of plugs containing line branches (1), but on that line branch (2) which contains the electromagnet (R ₁ ) , which brings the final character (S ^) on the second office (II) to respond, for the purpose that the second Office-facing closing characters (S ₂ ) of the first office unaffected and only to appear when the second office has disconnected the connection. 4. Embodiment according to claim 1 to 3, characterized in that the final signal electromagnet (R ₂ ) of the calling subscriber (T ₁ ) on the first office (I) the occurrence of a current flow through the final signal electromagnet (R ₁ ) of the second office (II) caused by voltage change as a result of switching the central battery (B ₂ , B ₃ ) on the first office or by switching on a branch via a resistor (W) , the voltage change BEZW. the resistance are dimensioned so that by switching in a connection between two subscribers of the same office no interference BEZW. Change in the operation is caused. For this purpose ι sheet of drawings.