DE731857C - Automatic telex exchange - Google Patents

Description

The invention relates to a telex switching system based on the self-connection principle for the connection of teleprinters with each other, with the certain Substations are able to send a message to a number of other • to be sent to other subscribers (broadcast). According to the invention, the calling Subscriber station by connecting to a

to signal device with the help of a single signal to determine whether everyone responds to the broadcast connected subscriber stations a confirmation for the receipt of the broadcast message have given, and if the attempt

Receiving an overall confirmation has shown that not all connected stations have confirmed receipt of the broadcast, the calling station can use any of the connected Check stations individually whether they have given a confirmation signal.

There are well known facilities in which a message is sent to a A plurality of subscriber stations are sent and a write connection in both Directions can be established so that confirmation can then be made. It is but with these facilities it is not possible to determine by a single signal whether all Subscriber stations have confirmed receipt.

The invention is explained in more detail with reference to the drawings which, lined up next to one another, represent the complete circuit. The selector provided on the right-hand side of FIG. Ι carries 22 contacts, so that the system is suitable for connecting a maximum of 19 stations. These stations are numbered 1 to 9 and 01 to 00 and are connected to contacts 1 to 9 and 11 to 20, respectively. No lines are connected in positions JV, 10 and 22. In the position that corresponds to the number of the calling line, only those lines are connected that are intended to send a Rundig message. Each station connected to the exchange is assigned a circuit, but the individual circuits are different from one another, depending on whether or not the subscriber bucket station is intended to send out broadcast messages or to receive such messages. In the arrangement of FIG. 1, the lines marked with a χ are omitted for the subscriber stations that are to send out a broadcast message and replaced by the corresponding connections shown in dashed lines. At the subscriber stations that are not to receive broadcast messages, the lines marked with a χ are omitted and replaced by the lines shown in dash-dotted lines.

However, each station can communicate with any other station via the voter arrangement in accordance with Fig. Ι connect.

The invention is concerned with broadcasting facilities; around, however, the relationship to the To represent the telex switching center as a whole, the production should first a connection between two individual pairs of conductors.

To send a call, the subscriber presses the SK call button. This creates a loop circuit via the lines α and b leading to the station from earth via a contact of relay Cr, line a, subscriber loop, line b, jack contact TI, resistance, contact of relay Bcr, contact of relay Cor, contact of relay CR, Winding of relay Lr, battery closed to earth. The relay Lr responds. When the dialing arrangement is in the rest position, the relay Onr responds , namely on the following current away: battery, lamp RL, resistor, relay Onr, contact of relay Bcr, contact of relay Dr, contact of relay Lbr, contact of relay Lr, resistance, contact JV of the voter, voter arm e to earth. The relay Onr closes a circuit for the relay Lbr , which is now activated. The relay Onr attaches itself to the c-wire of the calling line on the following current path: battery, lamp RL, resistor, relay Onr, contact of relay Bcr, contact of relay Dr, contact of relay Hr, contact of relay Onr, contact of Relay Bcr 7Mr c-core.

Relay Lbr marks the calling line as busy to other voters by disconnecting the d-Aaer of the incoming line IL, which connects the contact banks of other voters, from relay Cor and the battery. At the same time, the original excitation circuit is separated from the relay Onr and the battery is further connected to the c wire via this relay if the circuit is continued to earth via the relay Msr and the switch RK. The relay Msr responds and connects the teletype motor M to the mains and at the same time closes a contact via which the loop remains closed when the key SK is released.

As soon as the participant notices the engine starting, he actuates his dial. During the first opening of the number disc contact the relay Lr comes to waste, and provides a circuit from ground through the contact of the relay Onr, the contact of the relay Lr, two contacts of the relay LBR relay Lmr and the indexing magnet .S ¹ J / her. The relay Lmr is a relay with drop-out delay and remains activated during the transmission of the dialing impulse, but drops out after the last impulse. If the selected digit is an o, the selector arms come to rest in position 10, in which no further circuits are closed, and another digit can follow.

If the selector arms come to rest on the contacts of the called line, if the latter is free, the battery is connected to a circuit that is connected via Relafs Cor in the called line, contact of relay Lbr, contact of relay Bcr, contacts T, contact d of the selector, brush arm d, the two windings of relay Tr, contact of relay Lmr, contact and brush arm e of the selector runs to earth. The relays Cor and Tr work in series.

The relay Tr short-circuits its own high-resistance winding and creates a circuit for the relay Hr , which is as follows: battery, relay Hr, contact of relay Hr, contact of relay Tr, contact of relay Lmr, contact of relay Lbr, contact and Voter brush arms e to earth. The relay Hr addresses, interrupts the circuit of the relay Onr that fall short of the circuit of the relay Lbr

breaks while the relay Cr is triggered . This relay closes a holding circuit for the relay Hr via the make contacts of this relay, the make contact of the relay Cr, the contact of the relay Bcr to the c-wire of the calling line, the winding of the relay "Mif" to earth. The relay Hr on the called line speaks over the c-wire and the c-brush arm of the

ίο the selector and locks itself in series with the relay Msr via the c-wire of the called line, which also responds and switches the motor M on.

A transmission circuit is now closed between the two lines of the battery of the calling line, contact of relay Cr, contact of relay Cor, contact of relay Bcr, resistor, jack contact TI, δ wire of the calling line, contact of relay Msr, number disc contact, teletype contact F and receiving magnet EM, α-line of the calling subscriber, contact of the relay Cr, selector brush a, α-wire of the incoming line / Z ,, contact Cor of the called line, contact Bcr, resistance, jack contact TI, subscriber loop of the called line, contact of relay Cr to earth. It turns out that, apart from the two teleprinters and the resistors between them, there are no other apparatus in series or parallel to this loop, and the above connection is therefore no different from a direct connection between two teleprinters.

If the called line was busy, the relay Tr does not respond, and the relay Dr provided with a response delay can now respond from battery via relay Dr, contact from relay Tr, contact from relay Lmr, contact from relay Lbr, contact from brush arm e after Earth. The relay Dr interrupts the circuit through which the battery is connected to the c-wire via the relay Onr , and the relay Msr and the other relays in this circuit drop out. This stops the teletype motor and also via the relay Onr the relay Lbr

So and the relay Dr brought to waste. A circuit for the selector magnet SM is closed via the relay Lbr in order to bring the selector into the rest position. The relay Lmr responds during this time and prevents checking of the lines over which the selector arms run. If the voter has reached its basic position, the relay Lmr drops out , and the circle of the calling line becomes free again.

The connection can be released by either of the two subscribers by briefly pressing the closing key RK or automatically by opening the contacts SW controlled by the teleprinter if no characters are transmitted in either of the two directions during a certain period of time.

Certain subscriber stations can broadcast broadcast messages to all of the stations, intended to receive such messages. "For subscriber stations that want to send out a broadcast message, becomes the circuit shown in Fig. 2 with the selector of Fig. 1 according to the number connected to the calling line. In the embodiment is for the subscriber station the number 1 provided.

The subscriber who wishes to send out a broadcast presses the call button SK and thus brings the relay Lr and then the relays Onr and Lbr and finally the motor M of the teleprinter, as described above, to respond. Then the subscriber selects its own number, in this case the number 1, and thus, the brush of the voter on the contact no. 1. If the relay Lmr comes to fall, the relay Tr talks about the J-contact of the voter, a Kontakj; of the relay AR ₂ and the relay Ar ₁ (Fig. 2), battery to earth on.

The conductors a, b and d of the line OL in Fig. 2 are connected to 'the contact bank of another selector associated with a second station, which may send out a broadcast message, and the relay Ar ₁ corresponding relay Ar ₂ is assigned . When relay Ar ₁ responds, relay Ar _{2 is} disconnected from the <2 wire of line OL.

In the arrangement of FIG. 1, the relay Hr responds in the manner described above and thus also causes the relay Cr to respond. The battery is now connected to the £> wire of the calling line via the contacts of the relays Cr, Cor and Bcr , while the α-wire is connected to the contact of the relay Cr with the α-brush of the selector and thus via the relay Sr ₁ Earth lies. This relay is designed as a polarized relay, responds and places its armature on the sign contact. This closes a circuit from earth via the closing contact of the relay Ar ₁ for the polarized relays Sr ₂ , Sr _a and 5V ₄ , which also move their armatures into the position of the drawing. The relay Sr ₂ closes a circuit for the relay Jr, which is connected to earth via the normally open contacts of the relay Ar ₁ , the relay Jr, the contact of this relay, the sign _{contact of the relay SV 2} , the contact of the relay / fr, the lamp RL ₁ after battery runs. By addressing the re-

lais Jr the original excitation circuit is interrupted, but the relay holds itself through its own winding and its closing contacts as well as the closed contact of the relay Ar ₁ to earth. The relay Ar _{1 also} causes the relay Ahr to respond, which in turn connects the battery to the relays Bcr of all of the circuits associated with the subscribers intended to receive broadcast messages. The circuit of the relay Bcr, which belongs to the voting circuit of the calling subscriber, is disconnected at the contacts of the relay Ar ₁ , but the relays Bcr of every line that is to receive broadcast messages are activated, regardless of whether the line is busy or not.

If the line is busy when the relay Bcr responds , be it as the calling or the called part, the relay interrupts the c-wire leading to this station and the relay Msr in the station and the associated relay Hr in the switching center drop out and effect the complete release of the connection in the same way as if the release had taken place by a subscriber. The unexpected shutdown of the teletype motor indicates to the previously connected subscribers that an important broadcast message is arriving.

The calling subscriber writes the letter T on his teleprinter and thereby causes the relays Sr ₁ to Sr _{4 to place} their armature on the isolating contacts. A circuit for the relay Gr _{1 is} closed via the relay Sr ₂ , which in turn energizes the relays Gr ₂ and Gr ₃ . The relay Fr speaks after switching on by Gr _{2 with a} delay, binds itself and causes the relays Gr ₁ , Gr ₂ and Gr ₃ to drop out. During the brief actuation of these three relays , a circuit is closed for the relays Hr of all lines that are to receive a broadcast, so that these relays are in series with the c-wire of the line in question via their own make contacts, the make contact of the Relay Bcr, the contact of the relay Cor and the contact of the relay Cr bind and the relay Msr turns on the teletype motor.

The fr wires of six lines are connected in parallel to the sign contact of the relay Sr ₂ and thus connected to the battery. The α-cores of these lines are individually connected to earth via contacts of the relays Cr of their individual line circuits. Another six lines can be connected in parallel to the contacts of the relay 5V ₃ or Sr _t . If the calling subscriber sends out telegraph characters, these are transferred from relay .SV ₁ to relay Sr. ₂ etc.

transmitted and passed on by these relays to the corresponding lines.

At the end of each broadcast, all recipients can be asked to confirm receipt. For this purpose, each participant then briefly presses his RK button, thus interrupting the c-wire of his line and triggering the relays Msr and Hr . The first relay stops the teletype motor while the relay Hr reconnects the battery to the corresponding contact segment of the selector SMV . The line remains marked as busy because relay Bcr has continued to respond. If all participants have confirmed the message, relay Er will drop out and connect the battery to connection no.1.

The calling subscriber can now convince himself, either as a whole or individually, that the confirmation character has been received. In order to obtain an overall confirmation, he presses the key ^ Ä ". The relay Br in the broadcast circuit responds, then also the relay Kr, which brings the selector SMV under the control of the dial of the calling station. The lamp AL lights up because the battery is applied via the brush arm α of the selector SMV and the normally closed contact N. The lamp AL could not light up beforehand via the relay Br because of its high resistance Sr ₁ and Sr _{2 place} their armature on the isolating contacts, and the relay Sir and the magnet SMV are energized. The relay Sir interrupts the α wire and the lamp AL goes out. When the number disc contact closes, the selector SMV switches on its brushes position 1, and the relay sir drops out. If all participants have confirmed receipt of the broadcast, then, as mentioned above, the Batt erie is connected to the terminal and the lamp AL lights up. If the switch AK is reset, the relays and KV will drop out, and the selector SMV will return to the rest position.

To determine whether a certain line has confirmed the receipt of the message, the calling subscriber turns over the switch AK and dials the number of the desired line so that the brushes of the selector SMV adjust to the corresponding contact. If the subscriber has confirmed the message, the battery is connected to this connection via the isolating contacts of the relay Hr of the subscriber in question, and the lamp AL lights up. The calling subscriber can choose the SMV voter

Switch on step by step by repeatedly dialing the number ι, and thus receives a display via the lamp AL whenever the brush α is on a connection that is assigned to a participant who has given a confirmation. At the end of this control, the calling subscriber sets the switch AK to the rest position, and the selector SMV goes back to the rest position.

ίο The release of the \ ^r Getting Connected can only from the calling station take place, either by briefly pressing the shutter key RK or automatically by opening of the contacts SW of the teleprinter, which are opened in a known manner, if a time will take place no message exchange. This interrupts the c-wire and triggers the calling line as described above.

ao The above-described arrangement enables simple and quick actuation given the switching devices for sending broadcast messages, in which every sending station can convince that all subscriber stations receive the message received, with the option of checking which have not yet sent a confirmation to individual stations.

In addition to the transmission apparatus and the Receive relay no other devices in series or in parallel on the line, so that a correct transmission of the telegraph characters is ensured.

Claims (2)

Patent claims: i. Automatic telex switching system in which the subscriber lines can be connected to each other in pairs or a subscriber line can be connected to a broadcast circuit can be by which it is switched to a plurality of other lines, characterized in that determine the calling subscriber by connecting to a signaling device (Fig. 2) with the help of a single signal whether all subscriber stations connected to the broadcast have a confirmation sign for receiving the broadcast message. 2. Automatic telex switching system according to claim 1, characterized in that that if the attempt to get an overall acknowledgment showed that not all connected stations having confirmed receipt of the broadcast, the calling station each of the connected Stations can individually check whether they have given a confirmation signal. For this purpose 2 sheets of drawings