DE686189C - Circuit arrangement for telephone systems with main and sub-offices - Google Patents

Description

Circuit arrangement for telephone systems with main and sub-offices The invention relates to a circuit arrangement for telephone systems Main and sub-offices, in which to connect a sub-office subscriber calling to a connection path leading to the main office in the sub office can be set by current surges, which in the main office a setting of switching mechanisms cause this sub-office participant to be identified.

Its purpose is. The correct identification of the calling sub-office subscriber to be secured by the switchgear in the main office.

This is achieved by terminating switching devices the switching of the switching mechanisms in the sub-office and main office after reaching a only enable the subordinate subscriber calling through a test relay if this switching directly from a specific, by both switching mechanisms at the same time assumed position (rest period) has taken place.

In the idle state of the system shown there is the following closed circuit: earth, battery, resistance Wi ", contact 15 _x3, winding I of relay X3, contact 14x3, switching arm awhs, the switching mechanism Whs in position o, contact 12 p3, a-wire of the connecting line VL3, contact 7 dwu3, winding I of relay U3, switching arm a of the selector Was in position o, relays L3, L, windings I and II of relay L1, earth In this circuit, only relays L1 to L3 are energized, like this that the contacts of these relays are in the position shown.

If the system is in this state, there is an earth leakage on the a-wire of the connecting line VL3, then this earth conductor and the a -wires the connection Line VL, relay X3 via its winding I. excited. Its winding II is in a holding circle that runs over Earth, battery, resistance TVi ", Kontz @ hhe '39% 40X2, winding II of relay X3, I i d "Since the relays L1 to L3 are either short-circuited by (-Lit earth conductor or are de-excited by opening the contact 15 x3, inter alia. the contact i1 h closed and the contact i o h .opened. The following circuit comes up established: earth, battery, resistor Wise, contacts 55a3, 57p3, relay B3 (resp. Contact 22 q3, resistor W1.5), bAder of the connecting line VLs; Contact i i l1, Rotary solenoid Dwzt3 of the selector s Wit3, contact 6 u3, earth. Speak in this circuit the relay B3 and the rotary magnet Dzelits of the selector W u, on. The voter Wit3 leads a switching step. By closing the contact 42 b3 is in the main office HA3 of relay C3 energized. By closing the contact 19 b3 comes over the earth conductor the following circuit is established on the a-wire of the connection line VL3: earth, battery, Windings I and III of the relay As, contacts 2 i x3,. i g, b3, 16v3, 3 o t3, i 2p3, a-wire of the connecting cable VL3, earth conductor. That speaks in this circuit Relay A3 on and interrupts at contact 55 as via the b-wire of the connection line VLs running excitation circuit for the rotary magnet DzLizr3 and the relay B3. That Relay As holds itself with its winding I after closing. of contact 17a3 the earth conductor on the a-wire of the connection line VL. After aberration of the relays B3 and C3, the relay V3 is excited via the contacts 53 c3 and 5q.43. The relay As is then held through the contact 64v3, while the relay X 3, by opening the contact 39v3 drops. Through the permanent excitation of the relay As is dependent on a time switch device not shown here the contact 66a3 switched on a signal.

It should also be noted that the relay B3, after being de-energized via the .Kontakt 63b3, as long as the relay C3 is still energized, has closed the following circuit: earth, battery, switching magnet Dze! Hg of the switching mechanism Wla3, contacts 59 q3, 60 c3, 62 z ", 63 b3, earth. The rear derailleur Wh is also moved forward by one switching step. A further setting is now prevented.

If, in the rest position of the system, instead of an earth conductor on the a-wire of the connection line TIL3, an earth discharge occurs on the bAder of this connection line, the relay B3 is excited by this earth conductor via the b-wire of the connection line VL. The relay Cs: is switched on via contact 42 b3. The relay B3 remains excited via this earth conductor and, depending on its permanent excitation (timer), causes a signal to be switched on via the contact 65 b3 fle. A continuation of the voter Wzts in the sub-office UA3 0 #> iid of the switchgear Wh, in the main office HA, '= does not take place.

It should be noted that if the earth lead is on the a-wire or on the bA.der of the connecting line VL3 has such a resistance that the relay As or the relay B3 is not .excited, this earth conductor is harmless is so that the adjustment movement between your selector Wus and the switching mechanism Wlis is not disturbed. No signal is switched on either.

If the system is not disturbed in the rest position, the following switching processes occur when a subscriber calls: B. at the participant position Tiz, the following circuit is established: earth, battery, resistance WZ ", contact i5 x3, winding I of relay Xs, contact 14c3, - switching arm awhs of switching mechanism Wh3 in position o, contact i2ps, aAder of connecting line VL3, Contact 7dau3, winding I -of the relay U3, switching arm a. Of the selector Wit, in position o, contacts 5h, 1 11g, resistor W131, subscriber Tiz, s, contact 3h, earth. Relay X3 is energized in this circuit By closing the contact 40x3 it * is placed with its winding II via the resistor Wi3o in a holding circuit. By opening the contact 1 5 xs the closed circuit for the relays L1 to Ls is interrupted, so that these relays are de-energized This opens the contacts ioll, 3h, 5h, 2l; and closes the contact i 111. The following circuit now runs over the b wires of the connecting line VL3: earth, battery, resistor Wi4E, contacts 55a3, 57P3 , Relay B3 (or contact 22 qs, resistance W1.5); bAder of the connection line. VL, contact i 1 1 " rotary magnet Dv, ic3 of selector Wit3, contact 6 u3, earth. Relay B3 and rotary solenoid Dwus respond in this circuit. Selector W% performs a switching step. By closing contact 42-bs the relay Cs is energized, while the windings I and III of the relay A2 are connected to the a wire of the connecting line VLs via the contact ig b3, so that now that the contact 8 dwu3 is closed with the excitation of the rotary magnet Dwu3, the following circuit comes about: earth, battery, windings I and III of the relay As, contacts 2i x3 I9 b3, I6V3, 304, i2 p3, a-wire of the connecting lines VL3, contact 8 dwit3, winding II of the relay Li, earth. Im Sub-office UA3 the relay L1 is energized, while in main office HA, relay As is activated. In sub-office UAs, the circuit running over the b-wire of the connecting line VLs. Is connected to contact I 111 and, in main-office HAs, to contact 55 as openedV ... separated. In the sub-office UAs w ird by * on separation of this circuit of the rotary magnetic Dwu3 de-energized so that the contact 8 dwus opened again and the relay L is energized. In the main office HA3, the de-energization of the relay Bs, since the relay G remains energized as a delay relay, the switching magnet Dwhs of the switching mechanism Whs is excited via earth, battery, switching magnet D, tvlt3, contacts 59g3, 6o c3, 62v3, 63 b., Earth . The switchgear lVhs in the main office HA. also executes a switching step. In the meantime the relay As has also become de-energized. It was connected with its winding II and winding I of the relay P, temporarily for reasons to be explained later, via the contact 5o a, to the b wire of the connecting line VL. The same interplay is now repeated. Through this mutual control, .that is done in such a way that first the voter Wus in the sub-office UAs is advanced and after his -forward switching drives the switchgear in the main office, a dependency of the switching operations is achieved, whereby one Repetition of the interplay only occurs when both switching movements have been carried out. This is repeated until the calling subscriber Tnss is reached. Then, after contact 7 is closed again after de-energizing the rotary magnet Dwats, the following circuit is established: earth, battery, winding I of relay As, contacts a8vs, r 7 as, 304, r 2 ps, a-wire of the connecting line VLs, contact 7 dwus, winding I of the relay Us, switching arm a of the selector Wus on contact 3, subscriber Tnss, switching arm b of the selector Wtts on contact 3, winding II of the relay U8, contact 6u3, earth. In this circuit, the relay Us responds while the relay As is kept energized. At the contact 6u3 the earth is switched off from the b-wire and at the contact 9u3 by bridging the rotary magnet Dwus. By keeping the relay As energized, a switchover has been made in the main office HA s , so that now after: the de-energization of the relay Bs during the catching up of the corresponding switching step by the switching magnet Dwhs on the b-wire, the winding I of the relay P3 is around check the calling party. It is connected to earth with one winding and responds via the subscriber loop in the following circuit: earth, battery, winding I of relay As, contacts 1.8 71s, 1 7 ds, 30 t3, 1: 2 p3 (or switching arm awhs des Switching mechanism Whs on the contact segment), a-wire of the connecting line VL3, contact 7 dwu3, winding I of the relay U3, switching arm a of the selector Wus on contact 3, subscriber Trass, switching arm b of the selector Wus on contact 3, winding II of the relay Us , Contact 9 u3, b-wire of the connecting line VL3, switching arm bwhs of the switching mechanism Wh, on the contact segment, contact 5oas, winding Il of relay As, winding I of relay Ps (contact ¢ 8 dwlt3 still open), contact 5 r 71s, Earth. The relay As is kept energized in this circuit, while the relay P3 responds. It lies: with its winding II via the resistor Wise and the contact 26p3 in a holding circuit. The relay is energized for 1s via contact 56p3. The relays X, and C3 drop out. A new excitation of the relay Xs. By another call can, which is very important, only take place when the system has come to rest. It is therefore not possible to check for another calling subscriber when the system is running home - (contact 2r.3 open). After de-energizing relay Cs, the following circuit is closed: earth, battery, winding I and III of relay As, contacts 6.1.71s, i7as., 30t3, -arm awhs of switching mechanism Wh '. on the contact segment, a-wire of the connecting line VL3, contact 7 dwus, winding I of the relay Us, switching arm a of the selector Wus on contact 3, subscriber Tnss, switching arm b of the selector Wus on contact 3, winding II of the relay Us, contact 9u3 , b-wire of the connection line VL3, switching arm bwhs of the switching mechanism Wh, on the contact segment, contacts 29p3, 25c., 32i3, relay R3, earth. In .diesem circuit the relays A3 and U are kept energized, while the relay R. If one is found, the relay T. is excited in a known manner and by opening the contacts 30 ts and 32 t3 .the above-mentioned circuit is interrupted, so that the relays As and R are de-energized, while the relay U3 as a result of the through-connection the voice wires via the contacts 33 ts and 66 t3 via the feed bridge .des number current surge receiver is kept excited. The desired connection can be established by sending out number current impulses. The counter Zss corresponding to the calling subscriber Tu3s in the main office HA is switched on via the switching arm cwlts of the switching mechanism Wlts which is on contact 3. The connection established by the calling subscriber is triggered after the call has ended in the manner that after de-energizing the relay T3 from the downstream number surge receiver from the preselector VW3 is brought into the rest position. It is then the winding II of the relay PS, via which this relay has kept energized, short-circuited. The relay VS then drops out. Since the relay U3 has also become de-energized in the sub-office UA3, there is again the excitation circuit for the rotary magnet Dwu3 of the selector Wu "and for the relay B3 via the b-wire of the connecting line VL3. and the switching mechanism Wh, without the involvement of the relay As. The interruptions on the b wire are generated solely by the relay L1 excited via the a wire and the main office battery by means of the contact 8 dwu3, while in the main office the relay B3 at its Excitation switches on relay C3 (42 b3) and when it is de-energized (63 b3), it influences the switching magnet Dwh3 Coming closed circuit excited, so that the mutual control .by keeping the contact i 1 1 open or leaving the contact segment by the switching arm bwh3 is ended become fgenomines.

If this call comes via a line selector LW, not shown here; @so via the incoming wire, the relays 03 and T are excited. The relay 03 is placed in a hold circuit via its contact 35 q3 and thereby excites the relay P3 via the winding 1I. The relay Vs -is switched on via the contact 56 ps. By closing the contact 41 q, the relay CS is energized, so that now the existing circuit for the relays L, bis-L3 in the rest position of the system is interrupted. The rotary magnet Dwus of the selector Wii3 in the sub-office is connected in series with Odem relay B3 to the bAder of the connecting line VLs via the contact i 1 11. Current impulses from the line selector via the b-wire actuate the rotary magnet Dwus in the sub-office UA3 and, through the intermediary of the relay B3 in series with this, the switching magnet Dwh3 in the main office HA3, - so that a synchronization of both is achieved. The switchgear in the main office can be used to identify the desired subscriber in the main office for the purposes of customer service or other monitoring purposes (blocked connection, etc.) (switching arm ewhs). The further establishment of the connection is of no interest here.

When the call is over, the call is triggered from the line selector (LW) . In this case, relays QS, T3 and PS are initially de-energized, o that, as in the case of triggering, after the termination of an outgoing connection, the selector Wu, in the sub-office UA3 and the switching mechanism Wla3 in the main office HA3 is never idle.

Just as in the rest position of the system, as described above, earth conductors a stepping out of the voter Wzzs in the sub-office UA3 and the switchgear Wltg in the main office, this is also prevented if such earth conductors occur during the switching movement.

If such an earth leakage occurs, for example, on the aAder of the connecting line hL3; so, after the relay As has been energized when the selector Wu3 is advanced, the relay AS is kept energized by this earth conductor. After de-energizing relay B3 (continuation of Dwhg) and de $ relay CS, it causes relay Va to be energized so that its windings I and III are in a holding circuit via contact 64v3. A signal is then switched on via contact 66a3 as a function of a time contact. There is no further switching. Since the relay Xs is de-energized by opening: the contact 39 vs, a new call can only be accepted after the system has returned to the rest position, which is brought about after the earth conductor has disappeared, as above during the home run; the contact 2i xs is open up to this point in time and is only closed by the call after the relay X3 has been re-energized in the rest position.

If an earth leakage occurs on the -b-wire while the rotary magnet Dwu3 - is to be actuated, this excitation does not take place; Relay B3 is immediately switched on and held, so that further switching is also prevented in this case.

If, on the other hand, an earth leakage occurs after the excitation of the rotary magnet Dwu3 at .the bath, then only: the reverse current surge is given to the relay AS, so that by opening the contact 55 a3 the relay Bs is de-energized and the rotary magnet Dwhs excited. Only then is the relay switched on again after the relay A3 has been de-energized Relay B, kept excited via the earth conductor on the b-wire and a signal switched on.

Here, too, there is no stepping outside.

Does an earth leak only occur after the calling Participant is reached, so is through the loop test of the lying on earth Relay P3, which is then short-circuited by the earth conductor, a through-connection the connection path prevented. In addition, since relay A3 remains energized, via the normally open contact 66 a3 depending on the timer Alarm given.

Similar processes occur if a ground leakage after testing occurs before a free downstream voter is found from the VW3 selection is because the relay RB, which is connected to earth, does not respond to an earth leakage or cannot hold on. Depending on the energized relay As (66a, 3) a signal is also switched on in this case.

Line interruptions can also be signaled. Occurs z. B. an interruption of the a-wire during the rest position of the system or during the impulse transmission, then, since the relay L1 is de-energized and the relay A3 does not respond, a continuous circuit via the b-wire (contact i 1 11 closed ), in which the relay B3 remains energized and, as above, switches on a signal via its contact 65 b3.

An interruption of the b-wire is initially ineffective in the rest position; only when a call arrives that energizes relay X3 does a signal come in 70X3 comes about because relay X3 is not as usual after reaching the calling subscriber is de-excited, but remains constantly excited.

After every shutdown of the system, be it in normal traffic or be it after establishing an earth leakage, is the recording of a new call during the home run through a peculiar circuit of the call circuit X3 and of the test circuit prevented. This consists in that the relay X3 after each shutdown of the switching system is de-excited by the relay Vs and only again by a Call can be actuated when the switchgear in the main office HAs is in its rest position awh @ s has reached. However, as long as relay X, is not energized, there is an influence of relay As not possible (contact 2i x3 open), so that no connection of the test relay P3 to the b-wire via contact 5oas and thus no shutdown of the voter Wua on a sub-office participant. So it can do what an essential advantage for: the system is, the switching after reaching a calling subscriber can only be terminated if both switching devices have previously been activated at the same time have taken the rest position, so that the correct identification by matching Adjustment of both rear derailleurs is secured to the highest degree.

The particular advantage of this circuit can also be seen from the following: Is in the sub-office UA3 ider Wzt3 for operational reasons. (Test) or by incorrect handling by several steps (switching by turning the arms by hand. Off) from the zero position, the relays L1 to La drop out. This de-excitation is achieved with certainty if the circuit is changed so that the fulcrum of the contact 512 is connected to the a-wire instead of the relay L3 according to the dashed line. The rotary magnet Dwu3 is excited by closing the contact i 1 11 with the relay B3 in series. The voter Wu now takes a further step, whereupon the switching mechanism (switching magnet D, wh3) in the main office also carries out a switching step as it does when running home. This interplay continues without the involvement of relay A, as a result of the failure of relay X "to excite, as described for the home run. As a result of the advance: the voter Wats in the sub-office UA3 is first in the rest position. The relays L1 to L3 are switched via the a- The wire and the battery connected via the resistors Wisl and Wi24 are held. Since the relay B3 is no longer energized, the switching mechanism in the main office is switched locally by the interplay of the switching magnet D @ wlas with the relay Cs (6ocs, 47dwhs). If the switching mechanism reaches the zero position, the switching mechanism in the main office is shut down, as the switching arm dwh3 prevents further interplay. During this time, it is impossible to pick up a call, since the relay Xs can only be energized in the rest position and thus a switchover prevented by the relay As for checking via a calling subscriber loop at contact 2 1 x3.

The switching system can also fall out of step if after the movement of the voter Wus in the sub-office UA3 the supply current fails because then the switchgear in the main office can no longer catch up on the switching step. Also in In this case, a call can be made after the supply current is switched on again, as above are not included as long as the switchgear in the main office is not in the rest position achieved and thus equality is achieved again.

If in some unusual way a stepping out occurs in such a way that the voter Wu3 in the sub-office lags behind the switchgear in the main office, then when switching back the switchgear in the main office will reach the rest position in front of the voter in the sub-office. At this moment, the influence of the relay X3 by a new call or: by the reverse current surge via the contact S dwzts is prevented by the relay C3,: acting as a delay relay during the switching: of the switching system (the switchgear in the main office remains in: the rest position as a result of further excitation of the relay B3 via: the still running voter in the sub-office not standing) is kept excited, i.e. the relay X3 at contact 14 c3 is switched off or short-circuited at contact 13 C3. If the voter in the sub-office then reaches the rest position, the switching switch must be brought to the rest position, as was the case with the chasing after the switching mechanism in the main office.

Finally, the following case should be mentioned: If the supply current falls after switching through the connection path, after switching on the Feed current means that the switchgear in the main office is switched on ahead of time prevents .that relay B3 is energized via the b-wire first and only then the relay C3 is triggered, because it is via the switching arm: dwhs and the resistor responds with a delay. In this case, too, the recording is during the downshift : a new call is prevented by the special call circuit explained above.

Another advantage of the present embodiment is that that although there is an inevitability between the movement of both switching mechanisms, in a simple way the switching mechanism in the sub-office z. B. for test z = corner: by the supervisory staff after .separation of the cores in the main office can be set alone. By switching on From the battery to the severed wires, the rear derailleur can then also itself continue by the relay L1 with the rotary magnet Dwu, works as an interrupter.

Claims (2)

PATENT CLAIMS: e.g. Circuit arrangement for telephone systems with Main and sub-offices, in which to connect a calling sub-office participant to a connection path leading to the main office in the sub office can be set by current surges, which in the main office a setting of switching mechanisms cause this sub-office participant to be identified, characterized in that, that switching devices (X3) a termination of the switching of the switching, verke in the sub-office and main office after reaching a calling sub-office participant Enable a test relay (P3) only if this switching off immediately a certain; position assumed by both switchgears at the same time (rest position) is done. 2. Circuit arrangement according to claim z, characterized in that .daß the switching devices (Xs): by the specific position (rest position) of both switching mechanisms dependent switching means (z4cs, awlts) for influencing by a calling party Subordinate attendants will be provided. 3: Circuit arrangement according to claim 2, characterized in that the switching devices located in the main office in one over .the main office battery and the subscriber loop grounded in the sub-office running circuit can be influenced when a subscriber calls. Circuit arrangement according to claim 2, characterized in that the determined position (rest position) Both switchgear dependent switching means (C3, awlts) are arranged in the main office. 5. Circuit arrangement according to. Claim 4; . characterized in that the one switching means (awhs) consists of a switch arm of the switchgear in the main office. Circuit arrangement according to claim 4, characterized in that the other switching means (14c3) is on Normally closed contact of one in the specific position (rest position) of the switchgear in the sub-office de-energized relay (C3) is. 7. Circuit arrangement according to claim 2; characterized, that the switching devices (X.) after being influenced by a calling Participants until the termination of both switching mechanisms in a holding circuit place. B. Circuit arrangement according to claim 7, characterized in that the switching devices (X3) when they are influenced by a switching means (A3) arranged in the main office bring the influence of the switchgear in the sub-office. 9. Circuit arrangement according to claim 8, characterized in that the switching means (A3) in the main office after each switching of the switchgear in the sub-office: the test relay (P3) in the main office on the connection path turns on. zo. Circuit arrangement according to Claim 9, characterized in that the test relay (P3) which is connected to earth via a subscriber calling through and the two speech wires of the connection path -it educated, from the main office battery-powered loop responds. i i. Circuit arrangement according to Claim io, characterized in that the test relay (P3) is used to switch both rear derailleurs is terminated. 12. Circuit arrangement according to claim io, characterized characterized in that after the test relay (P3) has responded, the holding circuit of the switching devices (X3) is separated. 13. Circuit arrangement according to claim 12, characterized. that arranged in the main patent switching means (A3) in series with the test relay (P3) is kept energized. 1q .. Circuit arrangement according to claim 13, characterized in that that the switching means (A3) prior to the switching of the switching mechanisms in the rest position is de-energized and the connection of the test relay (P3) to the connection path is canceled. 15. Circuit arrangement according to claim i i or 12, characterized in that .das Test relay (P3) a connection of the calling subscriber to the next dialing level prompted, whereupon a provided there; also at earth - lying call relay (R3) is triggered in the same way as the test relay (P3). 16. Circuit arrangement according to claim 12 or 1q., characterized in that by the temporary Connection of the test relay (P3) to the connection path of a shutdown, the switching mechanism -in the sub-office on a calling subscriber who is connected to Tontakt this switchgear connected by the switchgear in the sub-office when it is forwarded be swept into the rest position, is prevented