DE701703C - Telegraph exchange system for long-distance and through traffic - Google Patents

Description

Telegraph exchange system for long distance and through traffic subject The invention is a telex switching system for long distance and transit traffic.

The traffic can be between adjacent as well as between such networks are going on that do not have any. have a common border. The ones to be connected In terms of technical, organizational and tariff terms, networks are subject to respective customary customs and legislation. Many of their operating conditions are therefore different, and there is a special circuit for connecting their Participants required. The invention relates to such a circuit. she consists in that when calling the operator for long-distance and through traffic to Purposes of the connection establishment by this in a known manner at the same time the desired trunk line is seized and blocked from other seizure and only the reverse transmission direction for the duration of the connection setup is switched through to the calling subscriber, but the forward one remains disconnected.

Namely, it is known for telephone exchanges when calling the switchboard for long-distance and through traffic for the purpose of establishing a connection through this at the same time to occupy the desired long-distance line and against other Block occupancy. Through the connection according to the invention associated therewith backward transmission direction and keeping the forward direction separated now achieved in telex systems that the calling subscriber while the connection is being established the remote station provides information about the progress of the connection setup on its Teletypewriter can receive.

The actual establishment of the remote connection to the foreign network is left to the remote place. This setup by the remote place takes place in from the telephone network group technology is known in such a way that this bypassing at the other end of the occupied trunk line directly reaches the switching center of the external network and thus has the opportunity to establish the desired connection without switching the remote station in the foreign network.

In the following, the switching system according to the invention for long-distance and through traffic on the basis of an example Embodiment explained in detail. For easier understanding of the switching processes in the exemplary embodiment Reference is made to the compilation of the main tasks appended to the description refer to the individual switching means. The embodiment described here independent networks with self-connection operation were used as a basis, although the Invention is also applicable to manual switching networks. The long distance switching through the remote place is always done manually or semi-automatically.

The attached drawing first shows the connection setup for a connection between participants of adjacent networks. The connection establishment happens in this case in such a way that the remote place in the network of the calling subscriber establishes the connection to the called subscriber in the foreign network. The remote place however, it is also suitable for connection via several external networks in a similar way. In the latter case, the calling subscriber only uses the remote place in the network the connection as far as the remote location of an adjacent to the network of the called subscriber Network established or arranged because this is necessary for reasons of charge control is. The remote place in the network that borders the network of the called subscriber is then exactly as it is reached from the remote place in the network of the calling subscriber for a called party is described below. If the called party is busy, the calling subscriber can wait because his connection is up to the remote station can be sustained. The remote station can also be used in a different mode of operation if there is a waiting of the calling subscriber for operational reasons does not allow.

These and similar circuit options are described below with reference to the drawing. At the top left, the drawing shows the wires a, b, c of the telegraph connection coming from the group selector GW. The part above the dash-dotted line shows all the exchange facilities that must be available for each exchange connection line in the exchange. Below the dash-dotted line, the exchange facilities are shown, which can be common for several subscribers or exchange lines. These are in particular the read-out relay MR and the interrogation device with the operator's interrogation machine. The teletypewriter in the office, which is connected as an interrogation machine, is known to enable the operator to receive requests from the subscriber about the connection to be established before the connection is established and to monitor the quality of the telegraphic traffic during the connection. The outgoing exchange connection line VL is indicated at the top right of the drawing. The telegraph characters are passed on to the called subscriber via the wires a1, b1 when they are keyed by the contact ar of the transmitter relay AR in the office. The telegraph characters of the called subscriber arrive via the wires a2, b2 and energize the relay BR, whose contact br takes care of the transfer to the exchange facilities and the calling subscriber.

Various counters are also provided in the office, which are operated by the Operator can be operated depending on the type of switching operations to be triggered have to. In the exemplary embodiment below, the switch contacts are of these switches which are open or closed depending on the position of the containers. To clarify these switching operations is then in the following description the position of the contacts is added in brackets.

By selecting the connection line leading to the external network of the desired subscriber, the calling subscriber accesses the input from the GW of the remote station via a group selector. The group selector places plus OB at the remote station via the c-core, and relays C and S respond via their windings II and I, respectively. The contacts cl and c2 switch on the winding I of the C relay and thereby increase the security against checking another group selector. The winding 1 1 1 of the relay R is a fault current winding. Contact c5 brings relay O. Isolating current (+ -TB) is passed to relay AR via contact o1. The armature ar moves on the separating side and thus occupies the connection line VL to the remote location of the external network. If the connection line VL is OK, the feedback signal is the isolating current via wire a2, whereby the relay BR is also switched to the isolating side. The relay R now responds via the relocated contact br. The call lamp AL is made to light up via the contact o6. The contact s2 switches the a-wire through. Characters that the calling subscriber may send out, however, do not reach the AR relay because of the relocated contacts o1 and o =, so that incorrect dialing in the foreign network is avoided. Contact s1 and contact f1 of relay f, which was excited via contact r2, switch the b-wire through. The subscriber can withdraw the call from the remote station before it is queried. In doing so, the c-wire is separated from the group selector and all relays drop out again. The connection line is released again by signaling current from the contact.

If the site officer queries an existing call by moving the direction switch to position l (internal or own network, all switch contacts J actuated), he thereby closes the circuit for the auxiliary relay RF. The relay D is also excited via the preparatory closed contact 04 and catches itself via its contact dl. When contact D2 is opened, the AL call lamp goes out. Since the connection to GW + -TB is on the b-wire, relay 1Y1 is excited via contacts f 5 and r15. The circuit for relay X is interrupted via contact m3 and the tail lamp SL via contact m2. Relay L and motor start-up relay W respond via contact rfs. The contact 15 short-circuits the high-resistance winding of L, so that if a further direction switch or read-in switch is accidentally switched over, the corresponding L relay belonging to another connecting line cannot respond. The motor of the interrogation machine is started via the contacts w3, w4. The contact w2 closes the send and receive location circles of the query machine. Relay V is delayed via contact w1 and switches off with its contacts vl and v2 the Senderelaiskontaktesrl and sr2 only then in the telegraph circuit prepared by the contacts h, L2, l3 and 1.1 to the calling subscriber when the interrogation machine has started properly, so that the transmission of false pulses in the telegraph circuit is avoided.

Separating current runs over the following path. the b-wire to the calling subscriber: -TB, contact r f 3, switch contact Tr, contact l4, contact i2, contacts srl, v1, u1, relay MRI, contacts l3, s1, f l or rf 1, 'b- Wire to the receiving relay of the preselector belonging to the calling subscriber. The remote station officer logs on with the query machine. The transmission relays SR, and SR2 are actuated. The contact srl sends the telegraphic characters to the subscriber, with the plus impulses taking their way through the relocated contact t2. The relay T located in the transmission circuit of the interrogation machine is energized when it is actuated. The read-out relay MRi gives the characters for printing the control script on the recipient of the interrogation machine. The relay MR2 runs synchronously.

The telegraph characters given by the participant come via the a-wire from GW and take the following route via contacts s2, rb2, switch contact Tr, l1, t3, sr2, v2, additional reading relay ATR2, contacts l2, e2, o2, oTB (telegraph battery center); the relay MR2 picks up the characters and scans the receiver of the interrogation machine.

After receiving the number of the desired subscriber, the officer puts the direction switch in position A (external or foreign networks, all contacts A are activated, contacts J are in their idle position). This closes the circuit for the auxiliary relay RB and energizes it. The same applies to the relay E, which has its own contact e; catches. By moving the contacts e1 and e2, the relay AR is switched back on to the a-wire, but the effect of any characters sent by the subscriber on the AR relay is prevented by the contact rb2. He applies to relay AR -E- -TB. The contact rb4 brings the occupancy signal relay G, which turns over its Kontaktgl. The contact br is now connected to the b-wire of the connection from the GW via the contacts g1, rb3, rf 3 etc. By moving the direction switch to position A, the relay U was also brought, which disconnects the transmitter relay contact srl with its contact ui. The purpose of this is that the now to select the desired subscriber through the number disc contact nsi on the transmitter relay SRI. and SR., and from these dialing pulses passed on in association with the relay T only reach the connecting line VL and not also the calling subscriber. The contact tzsa closes the transmitter of the interrogation machine and the contacts of the read-out relays mrl and mr2 while the dial is running, so that the selection is not disturbed by inadvertently pressing a key of the interrogation machine and that the receiver of the interrogation machine does not pick up the dialing pulses. If the called subscriber is busy, s4 character stream (minus) comes back over the connection line. The contact br is switched to the drawing side and short-circuits the relays G and R. Relay G drops faster than relay R and sends isolating current to the calling subscriber via its contact g1, so that the latter is held and relay R is prevented from dropping via its winding III. Contact g3 closes the circuit for relay X. Relays X and Y alternately excite each other. The tail lamp SL flickers over the alternately opening and closing contact x2. By moving the direction switch back to position J (all contacts 1 are actuated and contacts A return to their rest position), the calling subscriber can be informed that the desired subscriber is busy. Thereupon the disconnection of the connection to him is initiated by turning the read-in switch to the "disconnect" position for about 1 second (all contacts Tr are activated). The falling relay AI causes the tail lamp SL to flicker via its contact m3 until the direction switch is returned to the middle position (position of contacts A and J shown).

If, in contrast to the case just described, the called subscriber is free, the remote station triggers his identification device (name giver). The combination, which is used to trigger the identification device of the called subscriber, does not go to the calling subscriber as a result of the addressed relay U, while the identification message then made by the called subscriber passes through to the calling subscriber. The relay MR initiates the printing of the name message at the receiver of the query machine. After the direction switch has been returned to its "through-connected" position, the connection is ready for both participants to transmit messages, and the officer switches on the conversation timer Z141 by flipping the timer switch Z (all contacts Z actuated). The conversation timer is connected via contacts k4 and 1. with the interposition of the timing relay ZR with an i o-second switch io ". In addition, a circuit for the relay P is closed via a switch contact Z and via the contact ö3. This relay speaks and starts via its contact p2. When the contact p3 is flipped over, the timer lamp ZL lights up. The contact p4 prepares the final signaling. By moving the read switch to the position (all contacts 111L actuated), the relay L activates the transmit and Read relay arrangement looped into the connection so that the messages sent by both participants can be monitored with the interrogation machine and, if necessary, can be written to the two participants at the same time with the interrogation machine.

Now gives one of the with each other after termination of the remote connection connected participant the final signal, the connection is cleared down. at In the present exemplary embodiment: it has been assumed that it is a system acts with pure forward triggering. This specifies that the connection will be terminated always from the selection of the calling subscriber through continuous signal flow and is done by cutting the c-core. The two participant machines are shut down, the connection line released. The remote place remains for a new call from GW, and only in the direction just mentioned, blocked until the officer clears the place after reading the conversation timer Ztl1 by putting the timer switch back Z releases again in the rest position.

When the final signal is given, relay C drops out. about the contact c5 the relay O is de-energized. This leaves the tail lamp via its contact o5 SL light up. Relay l is energized via contact o3. The contact i2 separates the talk time switch ZM from the IO second switch. The Kontaktii locks against new call from the GW by disconnecting the c-core. Further falls through a short circuit the contact br the relay R and with it the relay F off. The relay P remains over energizes its own contact p2, causing the timepiece lamp to be over the still closed Contact p3 continues to burn.

Since the connection line is released, a connection can be established from the external network via the connection line VL via the remote station even before the call timer is read and the timer switch is put back. The relay BR is switched to the separating layer, and the relay R and with it the relay F are activated again via the contact br. The new connection is switched through to the GW. The contact r5 lights up the passage lamp DL. The timer lamp ZL and the tail lamp SL continue to shine. After reading the conversation timer, put the timer switch back to the "Off" position and set the timer to zero. When the contacts Z are returned to their rest position, the relay P drops out. The timer lamp ZL goes out via contact p3. Furthermore, the circuit of the tail lamp SL is interrupted via the contact p4. Relay J drops out when contact p is opened, contact il closes, which removes the occupancy lock for calls from the GW.

If the remote place is occupied by the external network via the connecting line VL, the relay BR is switched to the separating side. This will energize relays R and F. The group selector, which is connected to the output to the GW, is occupied by closing the c-wire via contact fs. Contact f2 connects the a-wire and contact f5 connects the b-wire to the GW. As a sign of the occupancy, the passage lamp DL lights up when contact r5 is closed. The further setting of the group selector or line selector is made by direct dialing via the VZ connecting line. The officer of the remote place does not need to intervene. However, by turning the read-in switch to the "read along" position (all contacts ML are activated), he can loop the interrogation machine into the connection and follow the establishment and course of the connection. After the name message of the called subscriber machine has passed through, the call timer ZM can be switched on by means of the time switch Z to control the call time. If a final signal is given in such a connection, the connection is again initiated from the preselection of the calling subscriber (requirement of the present exemplary embodiment). As a result, continuous signal current comes from the connecting line to the relay BR. This places its contact br on the sign side, and the relays R and F drop and release the remote location and the connecting line for a new assignment by the GW. The passage lamp goes out as contact r5 opens. Contact r4 brings relay 1 (, which separates the conversation timer from the 10-second switch via its contact k4. Contact k3 closes the circuit for flicker relays X and Y, and the timer lamp ZL flickers over the alternately closing and opening contact x2 via the folded contact k2.The flickering timer lamp prompts the officer to read the timer.

A call is made from the GW before the call timer is read off, the call lamp AL lights up normally, as already described, and the connection line VL is occupied. The conversation timer remains so long through the contact k4 switched off and the timer lamp ZL flickers until the officer stops the conversation timer has read and returns the timer switch to the rest position. So that will the relay I (, which is via its own contact k1 and later also via the Contact r4 - had held for so long, brought to the trash. The official is still posing the timer back to zero and can now query the incoming call.

In special cases, the entire connection can also go through the remote station are produced, d. H. both participants are picked up by him and then connected through. This exception can apply for the following three reasons find: i. if the called subscriber: was busy and the remote station was busy took over the connection when it became free, 2. if the connection line, which the calling subscriber had called was disturbed, 3. when the calling party Subscriber due to the busy condition of all leading to the network of the desired subscriber Connection lines had to be rejected.

In all three cases, the desired participant can be selected first and then the calling subscriber can be dialed. In cases 2 and 3 it may be more appropriate be to start the connection establishment with the choice of the calling subscriber.

If the connection is started by dialing the calling subscriber, the direction switch is first turned to its J position (internal network or own network, all contacts J are activated). The relay RF is energized and disconnects the c-wire from the GW via its contact r12, thus preventing a call from occurring. By moving the contact rf-, the AR relay gets the isolating current: + -TB, contact ml, contact rf4, contact s2, contact rb2, switch contact Tr, contact 12, contact o1, AR relay, oTB (telegraph battery center). The contactor flips over to the separating side and occupies the connection line. After receiving the feedback from the external network, relays R and F respond. The exit to the GW is occupied. The relay H responds via the contacts s4, r5 and starts itself via its own contact h4. The O-relay is energized via the contact h2, which causes the relay Di to respond via its contact o4. The circuit of the passage lamp DL is interrupted by the contact h5, the circuit of the call lamp AL is separated by the contact d2.

The relay AR is like when a call is queried by the contact o1 separated, so that the dialing impulses to the choice of the calling. Participant not too reach the opposite office via the connecting line. via contacts J, 5 and r15 Relay M responds because it is on the b-wire of the connection to the GW + -TB lies. The b-wire is then switched through to the GW via the contact ml. The query engine is looped into the line in the usual way. Now the choice is made first of the calling subscriber and then after flipping the direction switch to the Position A that of the called. After both participants have been elected, the Connection as described above.

The final signaling is contrary in the case just described that described above depends on the contact r5. Gives one of the two subscribers terminates the connection. It the relays H and O fall, their circuit through the contact r: of the falling Relay R is interrupted. As described above, contact o3 brings the Relay J, which blocks the space for calls from the GW. The tail lamp SL lights up on, the contact i2 switches off the call timer from the io-second switch: The lamps ZL and SL light up despite any new assignment of the connection line until the timer switch is reset.

If the connection is not established, as just described, with the choice of the calling subscriber, but instead begins with the choice of the called subscriber, so will the direction switch is switched to position A (all contacts A actuated). The relay RB is energized and separates the c-wire from the GW via its contact rbl and prevents a call from accruing. The relay AR gets through the contact rb2 separating current and consequently shifts to the separating side, with which the connecting line is occupied. After receiving the feedback from the opposite office, the assignment takes place on GW. The relay Q is operated via the contacts s4, rb, switch contact A, h3 excited and catches himself through his own contact g3. The circuits of the passage lamp DL and the tail lamp SL are interrupted by the contacts g4 and g5. The contact g1 transfers and prevents the dialing pulses when the desired subscriber is dialed run to the GLV.

After the called subscriber has dialed, the direction switch in the position J (all contacts f actuated) switched to dial the calling To bring in participants. The relay H responds and switches with its contact h3 the relay Q off. The relay Q has a drop-out delay. over the still closed Contact g2 and the closing contact hl, the relay N comes and catches itself through his own contact n1. The contact tt2 prepares a circuit for the Relay E and thus for the reactivation of the AR relay, which is triggered by the contact o1 of the O-relay excited by contact lay is disconnected from the b-wire to the GW.

After the calling subscriber has dialed (the dialing pulses cannot reach the connection line again because the AR relay has been disconnected) and notification that the pre-ordered connection is now available, the direction switch is returned to the "through-connected" position. Relay E responds via contact n2 and contact 1 , which is now in the rest position, and switches the AR relay via its contacts e $ and ei. the b-core to the GW through again.

The switching operations when the timer switch is operated and when the final signaling are the same as described above. Is with the one just described Traffic, d. H. with the traffic in which the entire connection setup from the remote place to the calling as well as the called subscriber from the operator of the remote station is established, one of the two participants is occupied, the tail lamp always flickers SL. The flickering of the tail lamp SL is initiated when the calling subscriber is busy through the relay M and when the called subscriber is busy through the relay G. Im When occupied, the officer puts the read-only switch in the position for about one second »Disconnect« to (actuation of all contacts Tr), whereby the entire connection is broken will.

Compilation of the main tasks of the individual switching means (relays) C is the first relay from the GW when a call is received and controls the call and closing signal relay O.

D clears the call signals.

After the query, E switches the AR relay through again to pick it up of the desired participant.

F, R's auxiliary relay, holds due to its large dropout delay in those remote stations that were not involved in establishing the connection by shining through lamp 1) L, when the calling subscriber gives the final signal off, continuous signal stream coming over the connection line, the place blocked for so long, until the opposite direction has also moved into the permanent position.

G, occupancy signal relay, lets the tail lamp flicker when the called Participant is busy.

H comes only in the remote place which is used when establishing a connection calls both participants to be connected and then connects them. When dialing the calling subscriber, it brings the relay O and thus prevents the transmission of the dialing impulses over the connection line.

J equals blocking relay to block the GW in the connection making Fernplatz after the final signal has been given.

I (only occurs in those remote places that are involved in establishing the connection were not involved in the final signaling. It makes the timer lamp flicker.

L loops the transmit and read relay arrangement the Interrogator in the telegraph circuit.

M, occupancy signal relay, lets the tail lamp flicker when the caller Subscriber is busy when the call is made by the remote station.

N only comes in that remote place that has the entire connection between two participants establishes when the connection is established with the choice of the desired Participant is started. It brings relay E when switched through; whereby that Relay AR switched off during the dialing of the calling subscriber switched on again will.

O leaves the call lamp when calling from the GW and when giving the final signal the tail lamp light up in the remote area that is establishing a connection.

P comes only in the remote place setting up a connection. It leaves them The timer lamp will illuminate and prepare final lamp circuits. aside from that it prevents relay I (.

Q only comes in that remote place that has a complete connection between two participants - builds up in both directions, and prevents the election via the connection line, the transmission of the election impulses to the GW.

R comes from the connection line as the first relay when it is occupied and causes the timer to switch off when the final signal is given.

S stops when one of the two participants gives the final signal Place blocked until the opposite direction has moved into the permanent position is.

T equals auxiliary transmission relay. When taking notes, it separates the telegraph filter circuit and puts the plus telegraph battery on the isolating contacts of the transmitter relay the query engine.

U prevents the impulses when the desired participant is selected to the calling subscriber.

V prevents incorrect pulses from being sent out by the transmitter relay when looping in the query machine.

W turns on the engine of the query machine and applies voltage the telegraph circuits of the interrogation machine.

X, Y equals flicker relay.

Claims (1)

PATENT CLAIMS: i. Telex switching system for long-distance and through traffic, the several independent teletype networks by -capable of occupancy in both directions of traffic Long-distance lines connects with each other and in the case of the switchboard for long-distance and Transit traffic of the network to which the calling party belongs, the entire connection can be established up to the desired subscriber of the foreign network, thereby characterized that when calling the operator for long-distance and through traffic for the purpose of establishing a connection through this at the same time in a manner known per se the desired trunk line (u1, bi,, a2, b2) is occupied and against other occupancy is blocked and that for the duration of the connection establishment only the rear transmission direction (b) - to the calling subscriber, the forward one is switched through (a) but remains separated. z. Telegraph exchange system according to claim i, characterized characterized in that the final and complete connection of the entire Connection only after the connection from the attendant console has been established Long-distance and transit traffic from the calling party to the called party he follows. 3. Telex exchange system according to claim z, characterized in that that the connection after the connection has been established with the activation of the Talk time counter (ZR) is connected. q .. telex switching system according to Claim 3, characterized in that a final character all when switching through activated call time counter (ZR) of the attendant consoles in the course of the connection automatically switches off for long-distance and through traffic. 5. Telex exchange system according to claim q., characterized in that the switched off by a final character The call time counter can only be switched on again manually. 6. Telex exchange system according to claim i, characterized in that switching means (V, direction switch) are provided that the calling subscriber on the through-connected rear Direction of transmission (b) Control character indicating the progress of the connection establishment or transmit about its completion. 7. Telex switching system according to claim 6, characterized by switching means (V, O), which when the marking device is triggered (Name giver) of the called subscriber through the remote place both this and enable the calling subscriber to receive the identifier at the same time. B. telex switching system according to Claim i, characterized in that that switching means (G) are provided in the event that the desired telex subscriber is busy, maintain the switching status in the network of the calling subscriber. 9. telex switching system according to claim 8, characterized in that switching means (G) are provided that a busy signal does not reach the calling subscriber leave, but there is still a connection to the remote station and the reverse direction of transmission (b) is switched through. ok Telegraph exchange system according to Claim 2, characterized by switching means (H, O), which trigger the marking device of the calling subscriber through the remote station in the time the connection is established to the Prevent the called subscriber and intercourse with him.