DE945457C - Transmission system for telephone systems with dialer operation and several exchanges - Google Patents

Description

Transmission system for telephone systems with dialer operation and several Switching centers Addendum to patent 918 094 In telephone systems with dialer operation and several exchanges, apart from a few small network extensions, today it is consistently necessary to seal off the connecting lines so that they are floating and with inductive Current impulse output the direct current switching criteria coming from the local networks via the Transmission line.

The quality of the system from the standpoint of setting security both as well as the transmission requirements, symmetry, lowest attenuation, no earth conductor and the like, depends largely on the design of the inductive transmission devices determined, which are located at both ends of the line. Since with connections, which over many Exchanges run away, numerous such transmitters are occupied, they also have a significant impact on the cost of the whole system.

These transmission facilities can then be most appropriately safest and cheapest run, if already in the system of local circuits on the conversion of the switching processes into inductive current surges is taken into account.

In patent 918 094 a system is described which simplifies the transmission devices by the fact that from the feed organ of the calling and called subscriber, so from. Those two organs which send and receive the direct current transmission processes, all processes to be transmitted over the line in the form of pulses be sent with such a timeframe that they can be transmitted over the connecting line unchanged in time. In the system in question, two types of current impulses are used in both directions of traffic, namely those of 60 ms (short pulses) and those of 300 ms (long pulses).

As part of the specified system, which is for fully automatic connections First and foremost, it is useful to hang it up for a long time Marking power surges, hanging them up with short ones. In the transmission facilities counting devices can then be provided to record permanent states, such as e.g. B. Manufacturing the state of speech to hold on locally.

If, on the other hand, different kinds of compounds, e.g. B. also semi-automatic High-speed traffic connections and long-distance callback connections to be set off in this system a different distribution of the current surges is more advantageous; and this is the subject of the present invention. So it is in the present invention to a Transmission device which, in a further development of the aforementioned patent, switching means provides which by the given return pulses with different duration such be influenced that these switching means under the influence of a short current surge initiate and maintain a switching state to identify the connection state, under the influence of a long current surge, on the other hand, an already existing one Cancel the switching state again.

As is well known, this principle is in the direction of connection establishment has already been used with great advantage. In the incoming transformer for inductive As is well known, impulse current is provided by a relay circuit usually designated as Ci :. under the influence of short power surges, the occupancy is carried out as a permanent state during the history of the connection. This state becomes shorter when others are passed on Power surges are sustained and only canceled when a long lasting one Power surge triggers the connection. -The arrangement according to the invention makes of this proven distribution of the pulse ratios also towards the start of the connection use in such a way that steady-state conditions, such as e.g. B. Speech state and locked state, each initiated by short power surges, maintained by further short power surges and can be canceled by long power surges. According to further training of the Invention is the sending of these pulses for the feedback directly from Line selector off causes.

As can be seen from the circuit diagrams, in particular Fig. Q. and 5, as the most essential means of transmission, shows, thereby occurs a tremendous one Simplification of the transmission switching means, which not only for maintenance is highly desirable, but also for setting and transferring calls offers the greatest security.

The transmission facilities are thus only transit points for the impulses without the criteria being transformed further than with regard to the type of current Need to become. The switching arrangement according to the invention is therefore particularly suitable for systems which, in addition to fully automatic traffic, also manually operated express traffic and allow long-distance callback traffic. The multitude of feedback to be transmitted would require a considerable amount of memory per transmitter if one did not would choose the arrangement according to the invention.

According to a further embodiment of the invention, the transmission system perfected by the fact that for the various types of connection between the offices are set up, such return pulses are provided that they after the same uniform system, which, however, changes while the connection is being established can repeat several times, are arranged.

The invention is to be described with reference to the overview fig. i, which gives the connection plan of the offices. In this figure, those are switching organs reit figure numbers are given, the circuit diagram of which is also shown. It deals to all organs lying in the connection, insofar as they are the subject of the invention touch, i.e. with the exception of the group voters, who only touch the individual speakers switch through without having to reshape the criteria.

Fig.2 gives a compilation of the feedback pulses for the three Connection types, the fully automatic connection, the semi-automatic high-speed connection and a connection in long-distance callback traffic in the case of a busy call and a free call; .

Fig. 3 shows the call finder, which at the same time as a feed organ of the calling subscriber is trained, with details of the circuits for transmission the calling number when printing the slip; Figs. 4 and 5 show incoming and outgoing outgoing AC transformer; 6 shows a slip printer which, for Belonging to the end office, is relocated to the knot office; Fig. 7 shows a parallel selector as a reversal and V, knotting organ, as it is for the final traffic as well is intended for central office traffic and main office traffic; -Fig.8 shows the Note printer in cooperation with the direct current organs for local traffic and the Parallel voter; . Fig. 9 shows the express traffic area with the associated one Search dialer for connection in the main office; Fig. IO shows the local trunk line selector as the feeding organ of the called subscriber; Fig. I i shows a remote place for Long-distance recall traffic; Fig. 12 shows an audio frequency transmission device for double Directed traffic, which differs from the transmitters according to FIG. q. -and 5 by it differ in that they also enable the handling of remote callback connections and which in particular show the enormous simplification also in the two-way direction Traffic occurs through the application of the principle according to the invention. It goes without saying possible that the connection still runs through a large number of other offices. Included The group selector and transmitter according to FIG. 12 are repeated in each case.

As an introduction to the feedback (Fig. 2) it should be said: In the fully automatic Long-distance traffic is initially carried out in the switching system given as an example Test transmit a feedback which, sent as a short impulse, indicates that the called subscriber is free, while a long return pulse indicates that it is busy of the called subscriber. In the latter case it will be in fully and semi-automatic Connections the connection is triggered immediately up to the feeding organ of the calling party Subscriber from whom the busy signal is sent. Even with examinations the free signal is transmitted from the feed organ of the calling subscriber.

The hanging up of the called subscriber is considered a long power surge reported back. In local traffic means giving a short burst of feedback at this point the presence of a connection that does not require counting. In long-distance transport these are out of the question. With the transmission of the long detachment surge the connecting line in the state of speech becomes in all the organs in between switched through. If the called subscriber hangs up, there is no message about given the connection line. The connection is made solely by the calling party controlled from, as is common practice today in automatic systems. On the other hand, with regard to amplifier operation in the line selector when hanging an equivalent load is placed on the line, so that the amplifying devices find the lines normally loaded.

In the semi-automatic express service, the feedback is the same, until the moment when the officer reported and after the desired number for the subscriber dials the code and this number. As soon the officer raises the interrogation key again and actuates the dialing key, it sends a short return pulse that characterizes the hanging and at the same time cancels the speech state. The transmission of this hanging impulse marks in all transmission switching means and in the feed organ of the calling subscriber the connection as a semi-automatic high-speed connection.

Then it sends the dialing impulses, which in the semi-automatic system are carried out at the same time transmitted backwards via the b line to the billing device to actuate and trigger any bridging processes. These dial pulses when briefly given are by the transmission facilities as well as the others Feedback forwarded without affecting the storage facilities.

Then, however, a phase identification must begin if after when the choice is complete, the calling subscriber in turn sets the dial tone from his feed organ should receive. This is caused by the last transmitted dialing pulse is sent as a long power surge. This gives the transmission its character a notice number and causes in the intermediate transmission facilities the switch to the speaking state. A few ms later, the line selector gives the The feedback "free" or "busy" cancels the speaking state again and creates it the setting status again, while the free or busy tone in the calling exchange is created.

(The crazy busy signal during the election of the officials arrives at the Express traffic area, whereupon the officer passes on the busy signal. Through this confusion with the last long dialing pulse is avoided.) In the event of a message of the called subscriber is the off-hook signal by a long return pulse given, which restores the state of speech in all intermediate organs. Of the The rapid transit point is already when the connection is free or occupied eliminated.

In long-distance call-back traffic when the subscriber is free, the free-fuck message takes place, which from the remote place by sending a series of impulses to the remote exchange call is answered automatically. This is followed by the notification message like, in the fully automatic Traffic, but then can be hung up and unhooked in alternation. In the intermediate Transmission organs are each canceled the speech state when hanging, after restored after unhooking. By sending a series of current impulses, a call can be made will.

In the case of a stationary subscriber in long-distance callback traffic, after transmission of the normal long occupancy return pulse with a single current surge, whose submission is at the discretion of the officer in terms of time and causes the intrusion. The posting confirmation marks its completion and at the same time the state of speech manufactured. In this state, disconnection pulses are sent without the connection being established feedback would follow. From this moment onwards the verhiadung ceases same Process as with a free participant.

As can be seen, the transfer processes are each in such a way the changeover contact, short - long, switched off that the long current impulse the locally stored Permanent condition repeals again and again. Finally, on the basis of the transfer images also shown being blocked by a short power surge, by a long one. is unlocked again. This also avoids the permanent current blocking. In the event of When a selector is spun, a long feedback current surge is also sent.

The processes for establishing a connection should now be separated according to the individual switching elements are described, initially beginning with Fig. 3. -This Call finder is intended for offices of up to about 500 participants. For larger offices the corresponding back signaling relays and the signal circuits in relocated the first group voter. In the arrangement shown in Figure 3 is the first group dialer switched in the same way as the later connection group dialer. so only switches through the branches. For connections that leave the local district, In the group selector, a high-level contact h 0 closes via a 7o-ohmic resistor minus voltage to the d-line on which the subscriber counter is located.

Relays A speak via the starter line, which is shown here as a chain line; B and N on, and contact n5 starts the rotary magnet DAS . As soon as the C relay has responded to the free subscriber line, the high-resistance winding is short-circuited by contact c 5 and thus the subscriber line is blocked. C-relay connects the B-relay to the b-line when contact c2 connects, with contact c 6 the A-relay connects to the a-line. B relay stops on the starter lead. Contact nq. occupies the next organ, such as a group selector, contact c2 energizes the K relay, while the IV relay continues locally via contact n 2.

Contact k 5 switches the initial line to the next call seeker. The E-relay responds via contact a2, and contact e6 switches a thermal relay to earth, which in the case of the subscriber does not choose the connection after some Minutes. The thermal contact short-circuits the IV relay and this opens the c-branch. The S relay is energized via n 2 rest side a 5, via b 5, n 6, e 2 das A busy signal is given until the calling subscriber hangs up.

In the off-hook state, the official signal is given via contacts b 5 and e 5 given.

The subscriber now either chooses a fully automatic connection, starting with K = 0 and the code of the called office, whereupon then the desired number is dialed, or he dials KO and thus calls the express traffic station, to let him establish the connection. In both cases, how already mentioned, direct voltage through an h 0 contact of the downstream selector placed on the counting load.

With the first dial pulse, A and B relays drop out, and B relays, which are connected to contact b q. short-circuits, remains de-energized and thus lowers the line resistance. At the same time, the official signal is switched off and the dialing monitoring circuit of the thermal contact is interrupted. Contact a 2 in series with contact e i sends the current impulses into the a-line. If the E relay is interrupted for longer than 60 ms on a2 working side, it drops out and thereby limits the pulse duration at e i. This avoids a dial that is running too slowly from sending long-lasting power surges into the office. The individual series of current impulses are now sent sequentially without affecting the call seeker until the first response is received. When busy, earth is placed on the b line for 300 ms, and the M relay energizes with contact m q. the S relay, which, together with m2, short-circuits the IV relay and thereby throws it off. The subscriber then receives a busy signal and the connection is released.

If the feedback is clear, the! Hl relay is thrown off again after 60 ms, whereupon the S relay also drops out with a lag. In the meantime, relay D is energized and maintains its contact d 5 via g6 normally closed contact, contact d 2 allows the B relay to respond again, whereupon the S relay drops via contacts b 5, d4, s2- a dial tone corresponding to the first call is sent, which is then followed by a ten-second dial tone when S has dropped.

As soon as the subscriber who is called by the line selector out automatically, has sich'gemeldet, carried out the second feedback signal, the off-hook, and excites the 119-R (held relay 30o ms long. As a result, it is first b 2, na 6, ie the G-relay energized, which with its contact g6 switches off the E-relay and holds itself. The D-relay is thrown off again by the G-relay and the signal circuit is thereby cut off.

Via the contacts b 2, na 6, d i rest side, 700 ohm counter earth is connected to the d-branch, but this does not come into effect due to the short circuit from the downstream selector. can. If, on the other hand, no counting suppression voltage were applied, then between. When the D relay has dropped out and the M relay has dropped out, a short counting pulse can be sent into the d line. As well. it can be seen from this that, with an unhooking session lasting only 60 ms, contact m 6 has already opened before contact di returns to the rest position, so that in this case the count is not taken. This circuit becomes effective when calling stations that are unable to count in local traffic.

After the G relay has responded, the a and b lines are to the subscriber switched through, and the conversation takes its course. It can. well. around a act fully automated conversation, then. .he follows when hanging of the called party, no response.

If, on the other hand, it is a semiautomatic conversation, so the participant has now informed the officer which location and which phone number he wants to speak, and the officer replies: "I'll call." pressed the dialing key and sent a hang-in, which again that:, Z relay energized for 60 ms. This will energize the S relay and now the G relay interrupted at s i and thrown off. Through this. the B relay also drops away. The E relay can now respond via s i-idle side, g6-idle side. The call searcher is again in the state before the subscriber started dialing Has.

The series of electric surges sent by the officer did not reach in the call seeker, sonclern, are intercepted by the billing device .. On the other hand, the free or busy feedback pulse from the line selector is picked up again, as soon as the connection has been established. The HZ relay energizes, as with the first one Free feedback, again the S relay. After the m2 contact has returned to the rest position D-relay is energized and holds. The sign and the free character are again turned on.

The subsequent unhooking message also repeats the same processes as with the fully automatic connection or when calling the Schnellv erkehrsplatz, addressing the G relay, dropping the D relay, dropping the E relay. After the unhooking message has gone through, there is no feedback from the line selector. If the calling subscriber hangs up, contact a6 short-circuits the C relay, and thus the A and B relays also drop out. If. it was a long-distance connection, is via contact ci idle side B and N relays with a third winding via contact h2 to a collective resistor of the common call number transmission device. When the rotating transmitter discs pass the zero point phase, the current is amplified by direct connection of earth through a cam contact. Through the contact bi `the pulse transmission circuit is connected to the transmitter cams Sg, via which the thousands and hundreds of numbers of the calling subscriber are initially transmitted. A little further angularly offset, the transmitter disk Sz is then effective, which closes the contact ten times and thereby advances the magnet Das from its momentary position until the tens identification cam switches over the pulse generator circuit. In each of these steps, mechanical contact gives one thing. Current surge in the a-line and denotes it. the subscriber's tens number. According to an arrangement that has already become known, namely, the subscriber lines are connected to the contact ring of the call seeker in such a way that the distance of the line from the next, w io contact is the tens number and from. gives the one's number to the next w i contact. After switching over by w io contact, the later starting. ten contacts se effective and turn the. Call seeker continues until contact w i can drop the K relay. From this moment onwards, further current impulses are prevented, the \ 'relay and B-relay drop out, and the system has returned to its rest position.

Now should be the same. Processes in the transmitter pair (Fig. D. And 5) to be tracked.

When the c-branch is occupied, the outgoing transformer (Fig. Q.) the C relay on and energizes the relays P and with contact c2. T. When the first series of currents is sent, the relay A responds impulsively, and the contacts a i "and a2 give alternating current to the line. Contact a 3 energizes the U relay, which is holds locally, and can also feed the impulses in via a special cable. upstream Submit the printer device. This circuit is on. Hand of Fig. 8 further to be shown. The U relay energizes the R relay with contact u2, and this actuates the blocking contact; - i in the c-branch. The series of impulses reaches the transformer (Fig. 5), here excites the pulse relay A, which the current impulses with its contact a passes on this a-line. At the same time, the C relay is energized and assigned his contact c 2 the continuing c line while the C relay held and the U relay is energized. In the same way, all of the series of rushes transmitted through the transmitter.

When submitting the first response, vacant or occupied, that speaks S-relay and sends the message with its contacts si and s2 unchanged over time continue over the line. Through contact sq. the circuit PT is operated, which who has to monitor the speaking post. Also in the transformer (Fig. Q.) It has Relay S addressed and contact s put back earth on the b-line and at the same time, the PT circuit is partially short-circuited via c3 working side. It it is already known that the connection is released in the event of a busy response will.

In the event of a free check, the next response is the 300 ms message. The S relay in both transformers responds for 300 ms, the T relay is thrown off by a short circuit, and after the end of the current surge, the P relay also drops out. Now the G relay can respond in both transmitters via the normally closed contacts, and the transmitters go into the speech position.

In this position they remain in the fully automatic connection until triggered. In the semi-automatic connection, on the other hand, the conversation with the officer is followed by the suspension message, which acts on the second winding of the S relay and with contact sq. brings the G relay to drop out, while the PT switch load is recently excited. The two transformers go. so in, the setting status back. This is followed by the transmission of the series of dialing currents, which initially has no influence on the speech state. Only the last pulse of 30o ms duration again throws the: T-relay and then the P-relay, so that the two transmitters go into speech for a moment. About 100 ms later, however, the test result is returned from the line selector, and the PT circuit is started again. The G relay drops out again in both transformers. The subsequent unhooking message, given with 300 ms, throws the PT circuit again ah, and the transmitter goes into the speaking position until the call is terminated and until it is triggered.

The transformers described are available as transformers for fully and semi-automatic Traffic determined. If the long-distance callback traffic is also to be transmitted, one must Execution according to FIG. 5 b can be selected, in so far as the occupancy feedback is provided by a step relay M is kept away from the PT circuit in long-distance traffic. The first response; the same amount. whether free or occupied, the M-relay brings in the first stage. After finishing the first Impulse speaks to it in the second stage and remains in this stage, after which only Apply voltage to the PT and G circuits. Take effect from this moment the local control circuits as described in FIGS. 5 and 4 ,. 'This M-relay will accordingly inserted in both transformer circuits.

FIG. 4a shows a simplified embodiment of FIG. 4.

The transfer circuits have no impulse correction devices. Rather, the pulses are passed on by the AC receiving relays themselves. Because it is. behind the incoming transformer; as shown in Fig. 7, a pulse renewer arranged, which has the task of re-setting the pulses with dial accuracy produce.

If the transmitter is located behind the central office, where there are no automatic ones. Knotting processes are more necessary, then the incoming transmitter can itself be carried out with a pulse renewal device according to FIG. 5a. In this case, the contact of the -A relay actuates a small rotary selector memory Ds, the contact bank of which is tapped by a renewer selector De-. As soon as Ds leaves the zero position, the somewhat delayed test relay B is interrupted and drops out and thus initiates an interplay between T-relay and rotary magnet De, which this. Causes the voter to run after the Ds at a distance of about one pulse division. In this case, the current impulses are passed on through contact 12 at a locally defined time.

Finally, FIGS. 4 and 5 also show the. reverse blocking in this transmission system. As soon as contact u 3 closes in the incoming transformer, the S-relay is connected to earth by the blocking contact of the downstream selector via a capacitor and responds to 60 ms at this charge. This current surge is passed from the S relay of the outgoing transformer via a c break contact into the YX circuit and causes the excitation of both relays and the blocking of the c branch with yi or ri, since x 3 keeps the RR relay energized. When the blocking is over, the S relay is switched back to negative voltage by contact sp, so that the capacitor discharges and the S relay about 300 ms to respond. comes. It sends the lock termination pulse, which throws off the YX circuit again. In this case too, according to the invention, a permanent state, namely the blocking, is initiated by a short current surge and ended by a long current surge.

In Fig. 4a, the PT circuit blocks.

Fig. 6 shows in conjunction with the incoming one just described Alternating current transformer, a slip printer circuit for one that was relocated to the node office Slip printer. This is in front of the parallel voter, which is also the pulse renewer contains (see. Fig. 7). From the transmitter, occupied, the C-relay responds and energizes with its in contact c2 a relay R for reverse blocking, while contact c i on the one hand ensures that the date stamp is printed, on the other hand until the person is spoken to. of the R relay energizes a Z; relay, which is held locally. Through contact z 2 becomes a W-relay energized, which with. Contact w i connects the b line. Contact c4 forwards the assignment to the subsequent parallel selector. Now the power surges go unhindered over the two. Voice lines and cause the attitude of the tracking drive in the parallel selector, which. at the same time as a memory in the pulse renewer serves. The corrected; Be impulses. from a contact i in the rotary magnet. Dty given, where the relay V responds. This rotary magnet switches on. ten-part Type wheel ahead, while contact v i energizes an auxiliary relay M. After falling from. v i, the pressure nagnet is initiated via the mi working contact, the set type to post. Then the release magnet is activated by a contact dr of the pressure magnet Df excites and lets the character wheel return to the zero position. With fully automatic Connections are printed in this way all the numbers, with the power surges transmitted backwards by the parallel selector. When the conversation comes off grounds. Contact g the G-relay of the slip printer, and this switches with his Contact g an H-relay lying to earth, which, however, initially through the g-contact of the parallel selector is short-circuited. Contact g2 activates the watch magnet. In the case of semi-automatic connections, the officer comes to the Dial position goes, the g-contact of the parallel selector to drop, and now can -H-Rlelals. speak and hold while the C-Redäis also drops. With h2 contact i interrupted, the W relay drops out and thus opens the b line. The following backward-directed current surges are absorbed by the T-relay and are now set locally the rotary magnet: of the type wheel. Of course, i can also be used for this special arrangement of the same i-contact of the pulse renewer transmit the power surges from backwards. When the last prolonged power surge is given is, contact i i shorts the 7_ relay, so that it drops out, and now it can Address the W relay again via contact b 3 and the connection line in the b branch switch through again. It is known from the last prolonged current surge initially wrongly on ioo ms (read G-relay energized, then by the free feedback thrown off again .. This process has no effect in the slip printer. The free feedback just like the following unhooking message, it is transmitted unhindered over the b-line. 1After unhooking, the G-Relay responds again, and. the time monitoring continues. After the connection is terminated, after C falls to R The time and date stamp struck again and with it the closing time held. The R relay then continues to serve. the rear blocking until the rotary selector has returned to the rest position and the downstream parallel selector unlocked.

8 shows a corresponding slip printer arrangement for the connections coming to the node office or main office. It only differs in that the continuous occupancy in the c-branch and the direct control by the outgoing one Transformer. Otherwise, the switching operations are the same.

Fig. 7 shows the parallel selector, which the knot in the individual intermediate exchanges. has to manufacture. In the specified system, after. Select the number K = 0 via the slip printer and set the output to the connection line. Since the transformers work without a pre-pulse, the parallel selector is assigned the input of the setting pulses at the same time. While the C relay responds in the c branch, the A relay is already activated in pulses via the a. Line. His contact a. i energizes a control relay V, its contact a2 the rotary magnet of the follower mechanism Dm. In the meantime, the search dialer Ds was prompted by contact c4 to set an outgoing connection line to the main office, whereupon its test relay P can respond, switch the line with pi and p 2 , block it with p 5 and stop the search dialer with p 3. Contact p4 lets the J relay begin an interplay with the rotary magnet De of the pulse renewer via contact i4, whereupon contact ii renewed the corresponding ones. The outgoing a-line sends pulses via contact x 5 in. Switching arm dm i and switching arm dm2 serve as a follower arm and mark a semi-automatic connection via the tenth contact by energizing the relay H, mark the reversal by pre-energizing the T relay via the first applicable digit and then finally in the second stage after selecting the reversing code is made to respond. With fully automatic connections, the excitation of the T-relay in the second stage means the interruption of a connection leading to the main office at contact t 2 i, while with semi-automatic connections the P-relay remains held via h.5-contact until the H-relay falls again after the election. The following are to be distinguished in order: a) Fully automatic connection, which runs via the main office After the setting has been made here. is, the free or occupied feedback of the line selector is given via the b-branch and energizes the relay M on the b-line, which forwards the return pulse with the contact n22 into the line. Contact 2r2 i energizes relay N, which is held locally via its contact 2c i. As soon as the M relay again. has dropped out, i.e. the feedback is complete, the relay S responds. and maintains its contact s3 via c3 contact. Relay S switches the w and b lines through with contacts si and s2, see above. that the parallel selector is no longer influenced by the further connection processes until it is triggered by opening the c-branch. b) Fully automatic connection with redirection to internal.

In this case the T-relay is energized by the first digit of the internal code in the first stage, by the second digit in the second stage and. holds over the contacts t ii b.zw. t 24. As soon as the T-relay has picked up in the second stage, the test path of the outgoing search dialer is blocked at t2i, thus triggering the exchange line. On the other hand, the working side of the contact t21 switches on the test relay 0, while the changeover contact t22 actuates the search selector D7. As soon as an internal connection path is found, the contacts qi and q 2 switch a and b line through, q 5 blocks, q 3 stops the search dial, q4 lets the J relay interact with the De magnet for further impulse transmissions continue with the renewed. Current surges given by contact ii in the internal a-line. will.

As soon as the connection is fully established, the feedback Again the game of the relay 117NS initiated, and the further course of the connection corresponds to the case under a).

c) Semi-automatic connection to the main office In this case, after the parallel selector has been assigned, 0 is selected as the first series of impulses and passed on by the pulse renewer. At the same time, however, relay H is excited by the arm dm i and its contact h: 2 remains local.

The connection is made by dialing the two digits 0 to the express traffic station, which also sends a free return pulse and thus energizes the relays M, N and S in the sequence already described.

The voice line is now connected to the calling subscriber receives the dial tone from the call finder, the officer is prompted by a call lamp, to turn on. As soon as the officer reports, the express traffic station sends A long return pulse via the b-line, which corresponds to the disengagement pulse of the fully automatic Traffic corresponds. This is initially `ineffective by. -the parallel voter passed through and switches the call finder and any intermediate alternating current transformer into the speaking position. Also the outgoing AC transformer behind the office exit goes into the speaking position and excited with his contact g via a d-Arrn of the search dialer the Y relay switched on by h4 contact, which is held locally. That through the contact yq. X-relays that are also switched on cannot, however, at the moment respond because it is short-circuited by a g contact.

If the officer has now accepted the participant's request and goes into dial position, a short feedback pulse is transmitted via the b-line, which indicates hanging. This is located behind the search dial Ds outgoing transmitter, the G-relay is thrown off again, and now that too can Address the X relay and the circuit for receiving the reverse pulse provide. First of all, the N and S relays are thrown off by contact x 6, the S-relay by its delay like that. late that the suspension impulse is still undisturbed is transmitted until the start of the connection. Then by switching the contacts s i and s2 in the parallel selector in turn produced the pulse pick-up state, where but through contact x i the A-R ° -lais is placed on the b-line, so that it is over this now picks up the power surges sent backwards by the officer. Even these current surges are conducted through contact a2 in the rotary magnet of the follower mechanism and passed on by the pulse renewer using the J relay with normal timing. Contact i 2 puts it in the b-line for setting other similar i # parallel dialers or to save the selected number in the slip printer or. Time zone counter device (see T-relay in Fig. 6). The impulses of the i i contact, however, remain in this Trap ineffective.

The last rush of the number dialing is sent extended to 3oo ms. This enables the A relay to short-circuit and throw off the H relay with contact a3, while the X relay remains held at x 6 = contact. For the purpose of Reversal, this last current surge must also be passed on for a longer period of time, although the remaining current surges are given by the pulse renewer. Contact y 2 has the test relay B of the pulse renewer freed from its dropout delay, so that the pulse renewer at a distance of no more than .3o to 40 ms behind the follower lags behind. While the last current surge is received by the A relay, the position of the follow-up mechanism from the pulse renewer. If now i: 2 contact the last Has transmitted a current surge, the H relay has now been thrown off by contact a3 been, and hi-contact continues the last current impulse for a longer time. After falling off of the TI relay, the X relay can also drop out if v3 is interrupted, and thus becomes the entire circuit for the reverse pulse generation at the x-contacts is canceled again.

The H relay is no longer excited because the latching relay R the arms dm i or dm: 2 with contact r q. interrupted.

Now the line selector, whom the officer uses by dialing the number has set. has sent the free or busy acknowledgment via the b-line and thereby actuated the relay sequence M-N-S again, as already described became. From this moment on, the course of the switching processes corresponds to the corresponding ones Phases under a) and b). d) Semi-automatic reversing connection The processes correspond the case c) until something in the course of the number dialing sent backwards over the arm the T-relay is energized in the first and then the second stage. This will make the Q relay and the magnet Dv is switched on, and the internal search selector is initially set parallel to the outgoing search dial. As soon as a free bridging path is found is, the Q-relay responds, and now the pulse renewer can also carry out the following series of current impulses forward with the 1 relay. forward onto. These are connected to contact ii via x2 working page put into the a-line of the internal connection, so that this discontinued step by step will. Otherwise, the processes proceed, as described above, up to the moment where the last prolonged surge is sent. As soon as the X relay has dropped out and the t2i contact has responded, the P relay of the outgoing search dialer will be discarded and thus triggered the connection line leading to the office.

The parallel selector is now only activated through the reversing connection that has been set up further influenced, initially by the first free feedback pulse, which M, N and S relays can be effective in the manner described. From then on corresponds the. Connection history in the cases described above.

FIG. 8 shows a similar slip printer arrangement as shown in FIG Fig. 6 has already been shown, only with the difference that the one behind the call seeker Group selectors lying above decade K = 0 occupy the slip printer, i.e. not on incoming AC transformer according to FIG. 5. The circuit diagram of FIG. 8 therefore requires no special description.

Fig. G shows the express traffic place over which the semi-automatic connections are placed. It is known to be occupied by dialing the second digit 0, for example by a parallel dialer according to Fig.g. 7; from which the "switching arms are indicated on the left. As soon as the C-relay of the further group selector has responded, it starts with its contact c q. via starter relay An to the search selector Ds, while contact c 2 has locally excited the 0-relay, its contact q 3 closes the test circuit of a search dialer Ds, which temporarily connects a connection unit of the high-speed station to the line. As soon as the search dialer has checked, the T-relay responds and in series with it the S-relay, the selector is stopped and the starting circuit interrupted. Through the contacts s2, s3 the a- and b-line are switched through, and now earth is connected to the b-line via v2-normally closed contact until the TI relay is energized with a delay by contact s6 Contact s 7 causes the call lamp to light up weakly, then contact s4 energizes the selector relay W, and contacts vd and w2 la make the call lamp light up brightly. Now the officer switches on with the interrogation key, whereby a 300 ms long unhooking return pulse is given into the b-line via the contact w i of the drop-off delayed relay W, the circuitry effect of which we have already described in the present switching bodies. After the ('relay has dropped out, the interrogation set is switched to the a- and b-line, and the officer can accept the participant's request. As soon as this has happened, she actuates the WS dial key and sends it via contact until the TI relay drops out vi a suspension pulse which, as is known, returns the transmission organs to the setting state.

Now she actuates the dial and thereby the J relay, which sends earth current surges into the a and b lines. Contact ii directs the current surges into the a-line of the continuing connection and thus initially sets the following group selector. Contact i2 sends the current surges back via the 1) line. If a voter goes crazy, the .11 relay located on the b-line responds, and contact nz2 puts earth on the continuing b-line for 300 ms and at the same time energizes the L relay, which the officer with the BL lamp states that it must re-establish the connection. In this case, the subscriber must call again.

When the connection runs normally, she presses the LS key for the last series of impulses, and an I, number switch normally open contact on the dial, which is only actuated with the last impulse, extends the last impulse to 300 ms.

Has determined the tracking of the upstream parallel voter, that the connection is not via the group selector connected to the right, but rather must run over the previous line, i.e. represents a bridging case, so the relay U is excited from the follow-up mechanism and throws the set group selector and thereby releases the right half of the connection.

If, on the other hand, the connection runs normally over the right half, then so if relay M is energized for 60 ms after the connection has been established, it also throws Contact m i the 0 relay and then drops off even after the b line is switched through will. At the same time, the test selector's test circuit is interrupted in the event of q3 contact, and the express traffic area is thus switched off.

Fig. IO shows the local long-distance line selector, its setting initially can be considered in the course of a fully automatic or high-speed traffic connection target. The processes are the same for both connection cases, since the officer as described, drops out of the connection after the election has been made. The line voter is assigned in the c-branch, with the C relay responding and a busbar with contact o 5 earths, through which the relay E is initially excited. The setting currents excite the A relay is pulsed, and contact a2 conducts it into the solenoid, while a i the control relay L 'is energized. After the first series of impulses, the TI relay drops out, and via the head contact k 2 and v i-normally closed contact, which has been activated in the meantime, this becomes U relay energized, which prepares a holding circuit with contact u 5. at the following series of current impulses becomes the rotary magnet via the working side of the contact u i set, and thereby the shaft contacts are switched. Via the working page of the contact w i, the Z relay is also made to respond, since contact e 3 has closed. If after the second series of impulses the TI relay drops out again, the test circuit of the P-relay is closed, possibly through interplay of the second winding of the relay A with the TI relay still the selection of multiple connections can be done.

When busy, relay E, interrupted by v2 contact, will drop out with a delay, without. the P relay could respond. Earth is connected to the b-line via contact e6-quiescent side. Z relay with a 300 ms drop-out delay due to electrolytic capacitor connected in parallel, interrupts this earth feedback with contact zi if it drops behind the E relay. This sends the busy response, which in these connection cases leads to the connection being released.

If, on the other hand, the P relay could respond, the TI relay is briefly energized via p 3 contacts e i, q i and x i rest-side contact and causes 0 and L relays to respond via p4 contact. Both relays hold themselves via L3 contact, and q i contact throws the TI relay off again. While earth is now placed on the b line through contact 14, the first burst of calls is sent to the a line through contact L i via the second winding of the E relay, the duration of which is limited by the dropping of the v4 contact.

A response was sent via contact e6-idle page, which is interrupted by z i working contact this time after 6o ms after the Contact 12 has disconnected the electrolytic capacitor shunted to the Z relay.

When the called party answers, the call monitoring circuit speaks the E-relay and in turn brings the Z-relay with contact e 3 to address. The L-relay is switched off by the same contact while q 4 holds the second winding of the 0 relay locally. After the L relay has dropped out, you can Y and A relays in the speech circuit of the called subscriber respond while the E relay, interrupted at L i-I <, ontalet, drops out. Behind the E-relay falls the Z-relay switches off with a delay of 30 ms and thereby sends the release feedback, which, as is well known, the speech state and the Connection of the line establishes. When the Y relay responds, y4 interrupted, the U relay is thrown off, and thus for these connection cases - further feedback prevented. The line selector is triggered by Open the c-branch by twisting it in a known manner.

Fig. 1r shows a remote place switch; whose mode of operation is to be described together with the circuit diagram (Fig. io). Let us first show the case of the free participant. FIG. Ii shows half of a connecting cord which selects a connecting group selector via a selector Ds. The magnet is started by the document tipper 13l until test relay C responds via a free output, stops and switches through. The officer now operates the interrogation key and uses it to connect the common place switch, which is shown below the dash-dotted line, to the connecting cord. By actuating the key A4, the relay D responds and remains locally via its drag contact di. With the number switch nsi, the officer sends current impulses into the a, line by energizing the A relay. These carry out the setting of the line selector (Fig. Io) in the manner just described, and the free response is also given after the check has been completed. The feedback current surge, given via the b-line, excites the Ah relay for 60 ms, and contact m3 short-circuits the D relay, but without throwing it off at this brief feedback. Contact mi energizes relay T via P 5 idle side, which is self-sustaining with contact t i. As soon as M has dropped out again, i.e. the feedback has ended, the P relay is energized via n2. In the meantime, the relay R was energized by contact t 2, which has a delay of 1/2 seconds due to an electrolytic capacitor connected in parallel. As soon as the P relay has responded, i.e. when the feedback has ended, it is thrown off by contact P 7 and now switches the A relay to a pulse breaker with contact ri, P 5, provided the D relay has remained energized, so that the feedback from the line selector is answered immediately with a pulse train lasting i second to i1 / 2 seconds. This is ended when the R relay drops out.

In the local long-distance line selector Fig. Io, the V-relay has been excited at this moment via p3, - ei-normally closed contact and has sent the first call impulse. Now the A relay responds in pulses, and contact ai extends this first call, which is characteristic of a long-distance call, by continuously energizing the TI relay. At the same time, the F-relay is energized via contact 16 and a4 and thus the connection is identified as a long-distance connection in long-distance callback traffic. f 2 contact holds the F relay locally, f 3 contact, together with q 6 contact, blocks the C wire against remote disconnection. Contact f 3 in the shunt closed, " 3 ensures that in this case of the remote connection the hanging and unhooking continues to be reported back.

As soon as the subscriber hangs up, the unhooking feedback takes place in the manner described and energizes the relay M in the remote place (Fig. Ii), which causes the T relay to drop with contact m2, then with contact m 4 after the end of the feedback, the G relay to Appeals. Contacts gi and g2 connect the officer's headset to the connection line, 93 via key A8 energizes the L-relay of the cord half, which with its double working contact ii binds the L-relay locally and thus for the cord half the Identifier - provides that the connection was established up to the speech state. This identifier is transferred to the shared place switch via key A7 as often as the query key is pressed. Relay K is energized, switches off the relays D, T, P , which are used to establish the connection, and controls the conversation relay G, depending on a WU circuit, which also has to operate the signal lamp. After the first response, contact P4 let the signal lamp SL light up, continuously on the d4 work side when the subscriber is free, flickering via the d4 idle side when the subscriber is busy. When the participant reports, this lamp goes out because, as mentioned, contact 12 switches. As soon as the officer recognizes by the extinguishing of the lamp that the called subscriber has hung up, she announces the long-distance call and switches through by raising the query key.

If the called subscriber hangs up or flickers, Y- and will drop A relay off. The E-R, relay is excited via the y5 normally closed contact and through this the Z-relay, which has a pull-in delay of 60 ms, and this means that e6 work, e.g. - Quiet side, the attachment message is given with 6o ms. When the participant hangs up again, F and Z are thrown off again and the 3oo ms return message is sent in each case. Between can be rung afterwards.

In the remote place (Fig. Ii) the S relay responds in the connected state, the JU relay in the interrogation state to this feedback, and either contact s and m 5 energizes the WU circuit when the short suspension pulse is received, and the WU circuit when the long one is received Unhooking message is dropped again. As a result, the tail lamp is controlled via w3 contact when it is hung up. The ringing is effected in the remote station by pressing the T button, which connects the pulse interrupter to the A relay via the k 4 contact.

In the case of the busy subscriber, the line selector is used the already mentioned 3oo ms permanent occupancy feedback, which with contact M3 in the remote place the D-relay drops by short circuit. This burns via the q.-normally closed contact after completion of the feedback the signal lamp flakl: ernd and the transmission of the ringtone is prevented. After some waiting, the The officer sends the activation impulse with the T button, whereby the d5-normally closed contact A relay in series with E relay responds and after 60 ms when the B relay responds is thrown off again. A single 60 ms pulse is sent out.

This energizes the X-relay in the local long-distance line selector (Fig.ro) via p4-break contact, a4-break side, e2-break side, Z @ 2-make contact, which with contact x2 causes the E relay and thus the Z relay via e3 to respond . With x4. a connection circuit is established for the P relay, and then the V relay drops out again, while X relay via its contact xq. remains held. E and Z relays dropping out one after the other, transmit a 300 ms off-hook pulse over the line.

After the speaking participants have been informed, the officer carries out the separation by sending a series of impulses from the remote station using button T and contact h 4th work page. As a result, the A and TI relays are energized again in the local long-distance line selector and the F and O relays are energized via the contacts v2, a4 idle side and x3 and the remote disconnection is thus carried out by applying direct earth to the c-branch, while the P- Relay on contact g: I is held locally. The X relay interrupted at 1- '2 drops out behind the TI relay. In this case, the x6 contact prevents the transmission of an unplugging surge.

After the X and A relays have responded normally, the further course of the connection corresponds to that of a connection when the subscriber is free. It has already been pointed out that the transmission of the acknowledgments in long-distance callback traffic for the alternating current carriers has the same effect as with fully automatic connections, since they are also given in the same sequence. Since the posting identification is identified in all organs by a so-called CE circuit, a further unhooking pulse of long duration can also be transmitted in the last-described case during remote disconnection, without the correct setting of the transmission organs being disturbed. For this reason, contacts x 6 and f 8 are only indicated in the feedback circuit of the line selector, as is contact f 7, which has to switch off the E-relay.

12 shows the alternating current transmitter for alternating traffic, specifically for tone frequency selection, which is produced in the simplest manner by combining the directional transmitters. The elements for local storage of the connection phase, the relays 1I1, T, P, G can be used together for both connection directions. The problems of direction elimination are insignificant for this transmitter and should not be described in the context of this system. On the other hand, it is essential for the assessment of this system to show how the arrangement of the transmitting and receiving relays F (audio frequency resonance relays or audio frequency tube receivers), A and S is simplified by applying the principle of return pulse transmission. As can be seen, relay S can be connected to the rest side of the g2 changeover contact, which serves as a pulse receiving relay for the outgoing transformer and as a feedback relay for the incoming transformer on the b-line. Analogously, the send contact a2 can act by switching directly to contact gz and thus to the direct current a.- or b-line, while the contacts, s6, a6 control the local storage device. The switching processes that are important in the context of the system can thus be understood from the description of the directional transformer.

Claims (3)

.C ATENT CLAIM CHr: z. Transmission system for telephone systems with dialer operation and several exchanges, which are connected via connecting lines by means of inductive current impulses and in which the switching devices located at the start and end of the connection (call seeker or I. GW, local long-distance line selector, high-speed traffic station or remote station) for establishing the connection and identifying the connection status ( Free check, busy check, hang-up and hang-up signaling, speech status) emit current impulses of different duration, which are transmitted over the line with the same duration in the form of inductive current impulses, according to patent 918 09q., Characterized in that the return pulses given with different duration on switching means of the Transmission devices (e.g. P, T, G; Fig. Q., 5, 12, etc.) act in such a way that these switching means initiate and maintain a switching state under the influence of a short current surge to identify the connection state ten, on the other hand, under the influence of a long current surge, such an already existing switching state can be canceled. 2. Transmission system according to claim r, characterized in that the transmission devices via the same connection way the manufacture of fully automatic and semi-automatic Allow connections and that the feedback sent out the transmission facilities each steer in the same sense. 3. Transmission system according to claim z and 2, characterized in that switching means are provided in the transmission devices, in the billing - and Umsteuerereinrichtüngen as well as in the feed organ of the calling subscriber, which characterize a semi-automatic connection on the basis of the feedback differently that after the conversation more Acknowledgments (suspension impulse) are transmitted. q .. Transmission system according to claim i and 3, characterized in that the. Acknowledgments in the case of semi-automatic connections are given in such a sequence that the switching means storing the phase of connection establishment become effective twice in succession. 5. Transmission system according to claim i and q., Characterized in that switching means (Fig.3, 1o) are provided in the local long-distance line selector, which allow the transmission of further unhooking and hanging messages after the start of the call when a remote callback connection is present, but prevents other connections. 6. Transmission system according to claim i and 5, characterized in that in the transmission devices (Fig. Q. And 5) switching means (P, T) are provided which initiate a storage process upon receipt of a short current surge and immediately cancel and thus the Make transmission processes independent of an inevitable sequence. 7. Transmission system according to claim i and 6, characterized in that switching means are provided in the transmission devices for the purpose of reverse blocking (sp, Fig. 5; electrolytic capacitor, Fig. 5; circuit YX, Fig. Q.) Which outside of the The connection setup converts a permanent state in the form of a two-cycle message into a four-cycle message with an introductory and final pulse and converts it back into a permanent state in the receiving organ (blocking). 8. Transmission system according to claim i and 7, characterized in that in the transmission devices (z. B. Fig. 5 a), via which remote callback connections are established, switching means are provided (M), which the memory devices (P, T) only to take effect after the end of the first feedback. 9. Transmission system according to claim i lind 8, characterized in that switching means are provided in the transmission devices (Fig. 5 a) of the centrifugal connecting half (behind the main office) in order to renew the incoming current surges. ok Transmission system according to claims 1 and 9, characterized in that switching means (W, Z, H) are provided in the transmission devices (Fig. 6), which direct the backward current impulse in semi-automatic connections into local storage devices - and prevent the backward transmission behind the charge metering device . i i. Transmission system according to claims i and io, characterized in that the backward-transmitted current impulses are also passed on by the pulse renewal device. 1a. Transmission system according to claims i and ii, characterized in that the memories (P, T) assigned to the transmission devices are influenced exclusively under the influence of the return pulses during the connection setup. 13- Transmission system according to claims i and i2, characterized in that the relay (G) which characterizes the speech state is de-excited when signals from both directions of traffic arrive.