DE615685C - Circuit arrangement for telephone systems with dialer operation and several exchanges in series - Google Patents

Description

GERMAN EMPIRE

ISSUED ON
JULY 16, 1935

REICH PATENT OFFICE

PATENT LETTERING

JiIi 615 CLASS 21 a 3 GROUP 37

Siemens & Halske Akt.-Ges. in Berlin-Siemensstadt *)

lying exchanges

Patented in the German Empire on April 23, 1931

The invention relates to telephone systems with dialer operation and several in A row of exchanges, between which connecting lines that can be reached via voters run freely. Arrangements are already known in which connecting lines between several switching centers lying in series connected via voters with free choice will. This interconnection takes place in such a way that only at Occupancy of a connecting line by a calling connection point of the associated Voters with free choice is set in motion and a free connection line to next exchange selects, in which then another voter with free choice started for the purpose of setting on a connection line of the next exchange will. These processes are then repeated in each exchange. The calling connection point must, as only when a connection line is occupied a connection path is established, with the number dialing until the interconnection is completed wait for the individual connecting lines. If she ignores this waiting time, she starts dialing the number too early, it receives bad connections.

These disadvantages will occur more frequently, the greater the number of those in series Exchanges is.

The present invention now aims in systems with several in series Switching centers one from the calling switching center to the desired switching center leading connection path regardless of the location of the desired exchange and independently of the fact that individual connecting lines running between the exchanges are used, for example, for connections to other exchanges, to be established with the greatest possible speed. You achieved this in that switching devices are provided in the exchanges which regardless of any existing connections between these individual exchanges free connecting lines running between the exchanges Occupancy by a calling connection point to one lying in the row Interconnect exchanges running connection path.

The arrangement according to the invention is therefore already at the time of occupancy a connection path running through all the exchanges in series set up so that even with a large number of exchanges immediately the desired one Exchange is reached.

In Figs. 1 to 4, an embodiment of the invention is shown, namely Fig. 1 shows the schematic structure of the system of interest here, while in Figs. 2 to 4 the individual streams of the

■ ι Γ on dsm Patenfsiher has been given as the inventor:

Alfred Keyser in Berlin-Tegel.

Connection establishment of this system are shown.

As we can see from Fig. Ι, for example, the subscriber T ₁ shown there of a main office subscribers of different node offices, z. B. the subscriber T _{4 of} the node exchange i, the subscriber T _{5 of} the node exchange 2 or the subscriber T _{0 of} the node exchange 3, reach.

ίο When picking up the handset at the subscriber station T ₁ is namely a call finder AS ₁ to find the calling subscriber and a preselector VW ₁ to find a free first group selector, whereupon after both voters shut down the participant T ₁ on a free group selector, z. B. GW ₁ , is switched through, which is now set in some known way by sending number bursts to a certain decade in which he has a free downstream second group selector, z. B. GW ₂ , visits. This group selector GW ₂ is also influenced by the calling subscriber T ₁ by number current surges.

If the subscriber T ₁ wants to reach the subscriber T _{4 of} the node exchange ι, for example, he sends a series of current pulses consisting of a current surge and thereby causes the second group selector GW ₂ to be set to the first decade, in which the group selector GfF _{2 has} a free transformer, z. B. the transformer Ue ₁ , visits.

The transformer T ₁ is connected via a preset mixing selector MW ₁ with the transformer U ₃ in connection without, however, this transmitter is Ue _3, locked by nevertheless mixing voters against occupancy by other mixing selector, which may also occupy this transformer. The transformer Ue ₃ is furthermore connected to the transformer Ue _a in the node _{exchange 3} via the transformer Ue ₅ via the mixing selector MW 3 in the node exchange 2, which is also preset without blocking. So we see that there is a continuous connection from the group selector GW ₂ to the transmitter Ue ₆ in the node office 3.

Since, as stated above, the group selector GW _{2 has reached} the transformer Ue ₁ over the first decade, a certain identifier, the origin of which will be explained later, is now sent out by the transformer Ue _{1 in the form of a certain frequency according to this setting.} This identifier, which is intended to designate the desired nodal office, influences the identifying devices arranged in the various nodal offices, e.g. identifying device KE ₁ - in nodal office 1, identifying device KE ₂ in nodal office 2 and identifying device KE ₃ in nodal office 3. Now that a connection is identified for the gateway exchange 1 through the availability of the transformer T ₁ via the first decade of the group selector GfF _{2, 1} cause the identification means / CJS in the transformer Ue ₂ a switch, such that at the changeover point U ₁ of the mixing selector MW ₁ switched off and the mixer selector MW ₂ is switched on, which is also on a free line selector, z. B. LW _{2 is} preset, but without having previously blocked this against occupancy by other mixer selectors. Now that the connection has been switched to him, the line selector LfF ₂ is blocked, as will be described later. The transformers Ue ₃ to Ue ₆ can now be used to establish other connections.

If the subscriber T ₁ now sends out two more series of current impulses, the line selector LW ₂ is raised accordingly by the first and turned in accordingly by the second, so that the desired subscriber T _{4 is} reached. The speech connection between the subscriber T _{1 of} the main office and the subscriber T _{4 of} the node exchange 1 accordingly runs from the group selector GfF ₂ via the transformers Ue ₁ and Ue ₂ , the mixed selector MfF ₂ and the line _{selector LfF 2} .

If the subscriber T ₁ wants to establish a voice connection to the subscriber T _{5 of} the node office 2, he does not send a current impulse for the purpose of setting the group selector Gf-F ₂ , but a series of current impulses consisting of two current impulses, through which the group selector GfF ₂ into the second Decade is raised. In this decade, the group selector GfF ₂ is looking for a free transmitter, which in turn may be the transmitter Ue ₁ shown in FIG. However, since this has now been occupied by the group dialer Gf-F ₂ for the second decade, it now sends a different identifier than the identifier mentioned in the previous connection. This also influences the identification devices KE ₁ , KE ₂ and KE _{3 again} ; The effect is now such that a switchover is made in the transformer Ue _{4 of} the node exchange 2, whereby the mixer selector MfF _{3 is} switched off and the mixer selector MfF ₄ is switched on. This mixer selector MfF ₄ is also in preparation, for example on a line selector LfF ₄ , without previously blocking it. Only now does the blocking occur both on the mixer selector MfF ₁ and on the mixer selector MfF ₄

a. The line selector LW _{1 is then set} to the desired subscriber T ₅ by the next two series of current impulses to be sent out _{by the subscriber T 1} . The speech connection between the subscriber T ₁ and subscriber T ₅ therefore runs from the group selector GW.> Down via the transformer Ue ₁ , the mixed selector MlV ₁ in the transformer Ue ₂ , the transformers Ue ₃ and Ue ₄

to as well as via the mixer selector MiF ₄ and the line selector LW ₄ .

In order to establish a voice connection between the subscriber T ₁ and the subscriber T _{0 of} the node office 3, the group selector GW » is set to the third decade by a series of current pulses consisting of three current pulses. In this, the group selector may in turn reach the transformer Ue ₁ shown in FIG. 1 as free. But since it has now been occupied for the third decade, it will send out a different indicator than the one previously mentioned above. This influences the labeling devices KE ₁ , KE ₂ and KE _{S in} such a way that the switching points U ₁ and U ₂ remain in the position shown; In addition, a line selector LW _{5 is made available} in the node office 3 for the following current surges via the transformer Ue _6. It may be mentioned that the transformers occupied by the mixer selectors MW ₁ and MW _{S are} only now blocked. If the subscriber now sends out the last two series of current impulses, the line selector LW ₅ is set accordingly to the desired subscriber T ₆ .

The voice connection then runs from the group selector GW ₅ , from via the transformer Ue ₁ , mixed selector MW ₁ in the transformer Ue ₂ , transformer Ue _s , mixed selector MW ₃ in the transformer Ue ₁ , transformer Ue ₅ and Ue ₆ and the line selector LW ₆ .

The participants in the individual nodes offices compounds may "training opportunities other than those described previously connects nan establish among themselves and with participants of other nodes offices but. So z can. B. the subscriber T ₂ about the call viewfinder AS ₂ and the selection VW ₂ a line selector LW ₁ which he can either set to a subscriber of the same node exchange, e.g. T ₄ , or to the transmitter Ue _3. The transmitter Ue ₃ is now capable in the same way as the transmitter Ue ₁ , according to the access it uses the line selector LW _{1 was} occupied with influencing the identification devices in the various node offices by sending out different identifiers.

So z. B. at a certain access, the switching device U _{2 operated} in the node office 2, so that the mixing selector MW _{3 is} switched off and the mixing selector MW ₁ is switched on, whereby z. B. the line selector LW ₄ in the node office 2 is blocked. By setting the line selector LiF ₄ , z. B. the subscriber T _{5 of} the node office 2 can be reached.

If, however, the line selector LW _{1 is set} by the calling subscriber T ₂ by a different series of current impulses and if it thereby reaches the transformer Ue ₃ via a different access, this transformer sends out a different criterion which does not bring about a switch in the transformer Ue ₁ , but instead the calling subscriber T ₂ the line selector LW ₅ via the transformers Ue ₅ and Ue ₆ is available, so that this z. B. can be set to the subscriber T _{6 of} the node office 3.

In the same way, a subscriber T ₃ can either be a subscriber of the same node office or z. B. reach a participant of the node office 3.

It may also be mentioned that the type of setting of the number surge receiver perfect for the thought of reaping is indifferent. This can be done, for example, by direct current surges or by alternating current selection, as shown for the! Single flow runs are assumed to take place. The ones necessary for the electoral movement Current flows are not shown; you can click on any of the things that are not of interest here Way to be trained. The same applies to the tripping of the transformer and the corresponding Voters without interest and therefore not described.

It should also be emphasized that several connecting lines run between the individual exchanges. For example, when the system is idle, there is a connection path: main office, node office 1, node office 2, node office 3 in each exchange via the connection lines of the individual exchanges connected to the first contacts of the group selector GW ₂ and the mixed selector MW ₁ , MW ₃ Now when a connection is established between the main office and the node office 2, this connection path is switched in the transformer Ue ₄ _ , the mixed dialers lying parallel to the mixer selector MW ₁ , which were also on the now blocked connection line: node office 1, node office 2, are opened the line connected to its second contact is advanced. The mixer selector assigned to this line and parallel to the mixer selector MfF ₃ connects when it, as indicated,

nonimen, on the first contact is the new part of the connection path arriving from the main office with the part originating from the node office 2. originally via the first contact of the mixed selector MW ₃ and the mixed selector lying parallel to it, so that the connection path used for the above-mentioned connection ' Replaced to the node office 2 by other connecting lines and so a new connection path is interconnected via the exchanges lying in series.

A corresponding addition to the connection path when using individual parts of the same can of course take place at any point of the connection path, so that, for example, a connection path that goes from the second contact in the group selector GW ₂ , in the mixer selector MW ₁ via the first contact, in the mixer selector MW ₃ via the third contact or via any other parallel mixer tap.

For the following description, FIGS. 2 to 4 are to be joined together in such a way that the mixer selector MW ₁ (FIG. 2) with the transformer Ue ₃ of FIG. 3 and the mixer selector MW _{3 of} this figure with the transformer Ue ₅ of FIG communicates. Accordingly, in Fig. 2, the relay T _{1 of} the Miechwählers MW ₁ energized via: earth, windings I and II of the relay T ₁ , switching arm of the mixed selector MiF ₁ , contacts 106Zj ₃₁ (Fig. 3), resistor WZ ₁₂ , battery, earth and In Fig. 3 the relay T _{2 of} the mixer selector MW ₃ energized via: earth, windings I and II of the relay T ₂ , switching arm of the mixer selector MW ₃ , contacts 170A ₃₂ (Fig. 4), resistor PFi ₂₃ , battery, earth. The excitation circuits of the rotary magnets D ₁ and D _{3 of} the above-mentioned mixer selectors are therefore separated at the contacts 51 t _t (FIG. 2) and 149 t ₂ (FIG. 3).

Now assume for the description of the individual circuit diagrams shown in FIGS. 2 to 4 that the subscriber T _1, as is clear from the FIG. 1 mentioned about the call finder AS ₁ and the selection VW ₁ the group selector GW ₁ and after its Setting has reached the group selector GW » . By influencing the group selector GJ ^ F ₂ by means of alternating current surges, the various connections generally explained above are established in the following manner.

i. Establishing a connection between the subscriber ^ of the main office and the subscriber T _{4 of} the node office 1

To set the group selector GW _{2, the} subscriber T ₁ first sends out a current surge, by means of which it is set to the first decade in which it can reach the _{transmitter JJe 1 shown in FIG.} This transformer is occupied by the relay C _{1 being} energized via the switching arm c and the contact bank of the first decade by a ground potential (not shown here) in the upstream GPF ₁ selection stage (earth, battery, contact 17A ₃ , relay C ₁ , switching arm c des - Group voter GW ₂ , earth potential in the upstream voter). When contact 9C ₁ is closed, relay A is excited via: earth, battery, relay ^, contacts 2A ₁ , 9C ₁ , earth. Α by closing "of the contacts 78 and 80 is a power source-Wechisel of the W _1, an alternating current pulse of 50 cycles over the shown in FIG. 2 wires for influencing the identification means sent to the various nodes offices. The effect of this alternating current surge will be described later.

As a result of the excitation of the relay A , in addition to the emission of the alternating current surge via the contact 30 α, an excitation of the relay H _{1 is} brought about via: earth, contact 30 a, relay H ₁ , resistor PFi ₂ , battery, earth. This relay is placed in a hold circuit via its contact 29 H _1. By opening the contact 2 A ₁ , the relay A is de-energized and the alternating current source PF _{1 is} consequently switched off again at the contacts 78 a and 80 a. By closing of the contact 12Zi ₁ but now energization of the relay A ₁ via: earth, battery, relay A _1, contacts 12A _1, 13A _2, 14C _3, 15 Co, earth, so that by closing the contacts 82% and 84O ₁ now an alternating current source PF ₂ , which emits an alternating current surge of 100 periods via the connecting line shown, is switched on. The effect of this alternating current surge on the tag devices will also be described later. Is ground contacts 19 (Z _1, C _1, relays H _2, resistance PFi _4, battery, ground by closing of the contact 28 A ₂ iw that: by energization of the relay A ₁ furthermore is an excitation of the relay H ₂ about through. Relay H ₃ energized via: earth, contact 28 A ₂ , relay H ₃ , resistor PFi ₀ , battery, earth. By opening contact 13A ₂ , relay A _{1 is} de-energized, and with it the alternating current source W ₂ by opening contacts 82% and 84% switched off again. Via contact 18A ₂ the resistor Wi _{1 is} switched on in the occupancy circuit, so that now, when the contact 17Zz _{3 is} opened when the relay H _{3 is} energized, the transformer Ue ₁ reached by the group selector GPF ₂ from no other Group selection

ler can be proven. Relays H ₂ and H _{3 are} held via contact 26 Ji _3. The alternating current surges of different frequencies emitted one after the other by the alternating current sources W ₁ and IF _{2 influence the relays X 1} , Y ₁ in the transformer Ue. ,, X ₂ , Y ₂ in the transformer Ue ₄ and X ₃ , F ₃ in the transformer Ue ₆ . In the transformer Ue _{2 , the relay X 1} , which is tuned to 50 periods, is influenced by the alternating current source W _1.

By closing the contact 40 X ₁ , the relay Co _{1 is} excited via: earth, contacts 40-ij, 43 ^ ₁ , winding I of ReIaJsCo ₁ , resistance Wi ₇ , battery, earth. ReIaIsZZo _{1 is} excited via contact 46 ^ _1. By closing the contact 55 Co ₁ , the blocking of the line reached by the mixer selector, which had already been brought about by closing the contact 53.T _{1, is maintained.} The mixer selector ./WW ₁ has occupied the transformer Ue ₃ in the idle state. His relay T _{1 is} excited via: earth, windings I and II of ReIaIsT ₁ , mixer selector MPF ₁ , transformer CZe ₃ , contact 106 A ₃₁ , resistor Wi ₁₂ , battery, earth. By short-circuiting the winding I of the ReIaIsT ₁ , as already mentioned, the transformer Ue _{3 is} blocked. After disconnecting the AC power source falls W _1, the relay X _1, whereupon ₂ a removable surge of ioo periods the relay Y _1, which is tuned to 100 periods, affected by the connection of the AC power source W. The relay Co ₁ is now energized again via the contact 39 V _1. By closing the contact 473J ₁ , the relays U ₁ and S _{1 are} excited (the relay Ho ₁ is activated as a delay relay even after the relay X _{1 is} de-energized) via: earth, contacts 47 ^) ₁ , 48Ao ₁ , windings I of the relays U ₁ and S ₁ , battery, earth. By opening the contact 67S ₁ , the blocking of the transformer Ue ₃ occupied by the mixer selector MW _{1 is} canceled. By closing the contacts TJu ₁ , 74.U ₁ and 204Ji _{1 of} the relay U ₁ , the transformer Ue ₂ switches over to the mixed water heater MW ₂ . The relay U ₁ is kept energized with its winding II via earth, contacts 55CO ₁ , 204U ₁ , winding II of the relay U ₁ and battery in the mixer selector MW ₂ , not shown.

As can be seen from FIG. 1, the subscriber T _{1 thus reaches the line selector LW 2,} for example, the line selector LW 2 via the mixer MW ₂ in any way that is not of interest here ₄ set.

After the relay Y _{1 is} de-energized when the alternating current source W ₂ is switched off, the relay Co ₁ holds itself via its winding II with simultaneous excitation of the relay E ₁ via: earth, contacts 36 ^ ₁ , 35CO ₁ , winding II of the relay Co ₁ , contact 42 .V ₁ , relay E ₁ , battery, earth. The relay C ₁₁ is energized via the contact 56CO _{1 and} is maintained via the contact 58 C ₁₁ . By closing contact 65 C ₁₁ , relay C _{21 is} excited via: earth, contact 65 C ₁₁ , relay C ₂₁ , resistor Wi ₁₁ , battery, earth. Relay C ₂₁ is held via contact 63 C ₂₁ .

The effect of the above described alternating current surges ■ sent by the transformer Ue _{1 on the relays X 2} and F ₂ in the transformer Ue ₄ (Fig. 3) is as follows:

The relay X ₂ in the transformer Ue _{4 is} influenced by the alternating current surge of 50 periods sent over the wires of the connecting line. Accordingly, the relay Co _{3 is} excited via the contact 126.T ₂ . This circuit runs through: earth, contacts 126 X ₂ , 129% winding I of relay Co ₃ , resistor PFi ₁₈ , battery, earth. Relay Co ₃ responds in this circuit. A ground potential is connected to contact 147 X _{2 , g 0 in} order to block the transformer Ue ₃ reached via the mixer selector MW ₃ , which was previously only occupied by the mixer selector.

If relay X _{2 is} de-energized after the alternating current surge of 50 periods has elapsed, relay Co ₃ is deenergized again by opening contact 126 x _2. Is carried out from the transmitter ₁ Ue the emission of the alternating current pulse of 100 cycles, the tailored to 100 periods relay F ₂ and caused by contact 127y ₂ responds energization of the relay Ho. ₂ Since, as described above, a switchover to the mixer selector MW _{2 has} now taken place in the transformer Ue ₂ (FIG. 2) at the contacts of the relay U ₁ , no further switching operations occur in the transformer Ue _4. The relay Ho ₂ is de-energized and the blocking of the transformer Ue _{5 is} canceled.

The alternating current surges exert the following influence on the relays of the transformer Ue _{6 (Fig. 4):}

Due to the alternating current surge of 50 periods, relay X _{3 is} excited and, by closing contact 185.V _{3, it} causes I ₁ S excitation of relay Co ₄ via: earth, contacts 185.T ₃ , 191C ₃ , winding I of relay Co ₄ , resistance Wi _2S , battery, earth.

After the AC surge has elapsed, relay X ₃ drops.

The alternating current surge of 100 periods then excites the re-

lais F ₃ . Since the above-mentioned switchover now takes place in the transformer Ue ₂ , no further switching processes occur in the transformer Ue ₁ . a.
5

2. Establishing a connection between subscriber T _{1 of} the main office and subscriber T ₅ of node exchange 2

To establish this connection, subscriber T ₁ sends out a series of current impulses consisting of two current impulses to set the group selector GW _2. This causes the group selector GW ₂ to be set to the second decade. In this, the group selector GW ₂ may find the transmitter Ue ₁ as free, so that the relay C ₂ in the transmitter Ue _{1 is} excited via the switching arm c of the group selector GW _2. This circuit runs via: earth, battery, contact 17Zi ₃ , relay C ₂ , switching arm c of the group selector GW ₂ , earth potential in the upstream group selector, not shown. When contact 16 c ₂ is closed, the relay is excited. ^ ₁ via: earth, battery, relay A ₁ , contacts 11 Zi ₁ , 16 C ₂ , earth. By closing the contacts 82 U ₁ and 84Gt ₁ , the alternating current source W _{2 is connected} to the wires of the connecting line and an alternating current surge of 100 periods is sent out to influence the identification devices in the various nodal offices. Via contact 31 Cs ₁ , Re-IaIsZZ _{1 is} excited via: earth, contact 31C ₁ , relay H ₁ , resistor Wi ₂ , battery, earth. The relay H _{1 is} maintained via its contact 29 It ₁ . By opening the contact 11 It ₁ , the relay A _{1 is} de-energized and thus the alternating current source W _{2 is} switched off. There is now an excitation of relay A via: earth, battery, relay A, contacts 3 Ji ₁ , τ Ji ₂ , 16 C ₂ , earth. By closing the contacts 78 α and 80 α , the alternating current source W _{1 is connected} to the wires of the connecting line and thus an alternating current surge of 50 periods is emitted. When relay A is energized, relay H _{2 is} energized via: earth, contacts 21 α, 22 C ₂ , relay H ₂ , resistor J-Fi ₄ , battery, earth. By opening the contact 1 Ji ₂ , the relay A is de-energized and thus the alternating current source W _{1 is} switched off. By closing the contact 28 H ₂ , the relay H _{3 is excited} via: earth, contact 28 /%, relay Ji ₃ , resistance Wi ₆ , battery, earth. Relays H ₂ and H ₃ are held via contact 26 Jt ₃ . Via the contact 18 Jt ₂ , the resistor Wi _{1 is} switched on in the occupancy circuit, so that now, since the contact 17A _{3 is opened when the relay / Z 3 is} excited, the transformer Ue _{1 can} not be occupied by any other group selector.

The alternating current surges emitted by the transformer Ue ₁ in the sequence 100 - 50 periods cause the following switching operations in the node offices: In the transformer Ue ₂ , the relay Y ₁ , which is tuned to 100 periods, is first influenced, so that the relay is excited via the contact 393 ^ Co ₁ enters via: earth, contacts 39 V ₁ , 43 e _lt winding I of relay Co ₁ , resistance Wi ₁ , battery, earth. If the relay Y ₁ drops out after the alternating current _{surge, the relay Co 1} is actuated when the relay X _{1 is} energized by the alternating current surge of 50 periods via the contact 40 X ₁ . After this alternating current _{surge has elapsed, relay X 1} drops out, whereupon relay Co _{1 is kept} energized via its winding II with simultaneous excitation of relay E ₁ via: earth, contacts 3Oy ₁ , 35C ₁ , winding II of ReIaIsCo ₁ , contact 42 X ₁ , relay -E ₁ , battery, earth. After the "transformer Ue ₃ " reached by the mixer selector MW ₁ has been blocked in the manner already described by applying a ground potential to contact 523Z ₁ , this blocking is now maintained at contact 5S ^ o ₁ .

The connection now remains switched through via the mixer selector MW ₁ to the transformer Ue ₃ (Fig. 3J. Closing the contact 56CO ₁ energizes the ReIaIsC ₁₁ and keeps it energized via the contact 58 C _11. The contact 65 C ₁₁ is used to excite the ReIaJsC ₂₁ (holding circuit via contact 63C ₂₁ ). No further switching processes take place in the transformer Ue ₂ .

In exchanger [Ze ₄ ^r echiselstromstöße following Schakvorgänge will now be initiated by sending the W:

_{First the relay F 2} , tuned to 100 periods, is energized. Relay Ho _{2 is} energized via contact 1273) 3. After the alternating current surge has elapsed, relay F ₂ drops out. The relay X ₂ is now excited by the alternating current surge of 50 periods and causes the relay Co _{3 to be} excited: earth, contacts 126 ^ ₂ , 129 ^ ₂ , winding I of relay Co ₃ , resistor ₁₈ , battery, end. By closing the contact 146CO ₃ , the blocking of the transformer Ue ₅ already brought about by the contacts 147.T ₂ and 145 j '' is maintained via the mixer selector MW _3. Furthermore, the relays U ₂ and S _{2 are} energized via: Earth, contacts 126X ₂ . 129 ^ 2, 138 Ao ₂ , windings I of relays U ₂ and S ₂ , battery, earth. If the relay X ₂ drops out after the alternating current impulse of 50 periods has elapsed, the relay Co ₃ remains via its winding II with simultaneous excitation of the relay E ₂ via:

Earth, contacts 125.T ₂ , 122 co ₃ , winding II of relay Co ₃ , contact 1283J ₂₁ relay E ₂ , battery, earth. Due to the above-mentioned excitation of the relay S ₂ , the blocking of the transformer Ue ₅ (Fig. 4) is now canceled again at the contact 150 S _{2 , while the contacts 155.Zi 2} , 153 ^ 2 ^{un <} i ¹ SiKs of the R ^e " lais U ₃ , instead of the mixer selector MW _3, the mixer selector MW ₄ is switched on.

ίο The relay U ₂ holds itself with its winding II over: earth, contacts 146Co ₃ , 151 U ₂ , winding II of the relay U ₂ to the battery in the mixer selector MW _4, not shown. By closing the contact 141 co ₃ , the relay C _{13 is} energized and is maintained via the contact 143C ₁₈ . By closing contact 131 C _{13, it} energizes relay C ₂₃ , which is held via contact 135C ₂₃ .

As can be seen from FIG. 1, the mixer selector MW ± is set in preparation for a line selector LW _4. If the calling subscriber T ₁ sets this line selector to the desired subscriber T 1, the voice connection is established.

In the transformer Ue ₆ , the emission of alternating current surges causes the following switching processes:

By energizing the relay F ₃ (alternating current impulse 100 periods) the relay E ₃ is energized via: earth, contacts 2iic., ₅ , 2ioc _s -, 2I2J /. ,, relay E _{: i} , battery, earth. _{If relay F 3} drops after this alternating current surge, relay E ₃ remains activated as a delay relay until it is held via contact 185.Y ₃ of relay X ₃ , which responds with the next alternating current surge of 50 periods.

If the relay X ₃ drops out after this current surge has elapsed, Jj ₃ also drops out after some time, so that the transformer Ue ₀ is again in the idle state.

3. Establishing a connection between the subscriber T _{1 of} the main office and the subscriber τΤ _{ΰ of} the node office 3

For the preparation of this compound the group selector GW ₂ is set by the calling subscriber T ₁ to the third decade, so that, under the assumption that the first free transformer, the transformer Ue ₁ shown in Fig. 2, c via the switching arm the relay C _{3 is} excited, namely via: earth, battery, contact 17 h ₃ , relay C ₃ , switching arm c of the group selector GW ₂ , earth in the upstream group selector. Closing contact jc _z energizes relay A via: earth, battery, relay A, contacts 2Zi ₁ , Jc ₃ , ioc _1; Earth. By closing the contacts 78a and 8oa, an alternating current surge of 50 periods is sent via the alternating current source W ₁ to the identification devices of the various nodal offices. The relay H ₁ is excited via the contact 30a , so that by opening the contact 2 Zi _1, the relay A is de-excited and the alternating current source W _{1 is} switched off. By opening the contact 2: 5 A ₁ , the short circuit of the relay H _{2 is} canceled so that it responds. An excitation of the relay H _{3 is then} brought about via the contact 28 h _& ^1. Relays H ₂ and H _{s are placed} in a hold circuit via contact 26A _3. From the transformer Ue ₁ only an alternating current surge of 50 periods has now been sent out. This affects only relay X ₁ in transformer Ue ₂ , so that when contact 40 X _{1 is closed,} Re-IaIsCo ₁ is excited via: earth, contacts 40C ₁ , 43, ^ ₁ , winding I of ReIaIsCo ₁ , resistor Wi ₇ , battery, end. Closing contact 46 X ₁ energizes relay Ho ₁ . After the relay X ₁ is de-energized, the relay Co ₁ with its winding II holds itself with simultaneous excitation of the relay E ₁ via: earth, contacts 3Oy ₁ , 35CO ₁ , winding II of the ReIaIsCo ₁ , 42 ^ r ₁ , relay JE ₁ , battery , Earth. The transformer Ue ₃ reached by the Alischi selector MW ₁ has meanwhile been blocked in the manner already described several times. After the relay Co _{1 has been} energized, the relay C ₁₁ is then energized via the contact 56CO ₁ , which energizes the relay C ₂₁ by closing the contact 65 C ₁₁ .

In the transformer Ue ₁ (Fig. 3) the relay X _{2 is} influenced by the alternating current surge of 50 periods and leads to an excitation of the relay Co ₃ via its contact 126.T ₂ : earth, contacts i26x ₂ , 129 ^ ₂ , winding I of relay Co ₃ , resistor J ^ i ₁₈ , battery, earth. "After the relay X _{2 is} de-energized, the relay Co ₃ with its winding II holds itself together with the simultaneous excitation of the relay E ₂ via: earth, contacts I2 $ x ₂ , 122CO ₃ , winding II of relay Co ₃ , contact 128 v _ä , relay E ₂ , battery, earth. After excitation of relay C ₁₃ via contact 141CO ₃ and thus occurring excitation of relay C ₂₃ via contact 131 C ₁₃ , no further steps occur in transformer Ue ₄ except for the blocking of transformer Ue _5, which has already been described several times Switching operations on.

In the transformer Ue ₆ (Fig. 4) the alternating current surge triggers the following processes: The relay X ₃ is actuated and closes its contact 185 ^ ₃ , so that an excitation of the relay Co ₄ occurs via: earth, contacts 185. ^ ₃ , 191% winding I of relay Co ₄ , resistance Wi ₂₈ , battery, earth. After leaving

When relay X _a is excited, relay COi is kept excited via its winding II with simultaneous excitation of relay -E ₃ via: earth. Contacts 184 ^ ₃ , 183CO ₄ , winding II of relay Co ₄ , contact 1893/3, relay E ₃ , battery, earth. The relay C ₁₅ is energized via contact 193CO ₄ , whereupon relay C ₂₅ 'is energized via contact 197C _15, thereby influencing the

χα relay Co _{5 occurs} via contacts 203C ₂₅ and 2O2e ₃ . By means of the relay Co ₃ , the line selector LPF ₅ in the node office 3 is occupied and blocked in some way that is not of interest here. By sending out power surges, the calling subscriber T can now set this line selector to the desired subscriber.

As was already explained in connection with FIG. 1, the various participants can now the node exchanges either to subscribers of the same node exchange or to subscribers of other node exchanges build up.

4. Communication of a connection between subscriber T ₂ . of the node office 1 and the subscriber T ₅

of the node office 2

As we can see from FIG. 1, the subscriber T ₂ can reach a line selector LW ₁ via a call finder AS ₂ and a preselector VW ₂ . By sending two series of current impulses, subscriber T ₂ can now set the line selector LW ₁ to a specific contact of a decade in any way that is not of interest here , for example occupying the transformer Ue ₃ shown in FIG. 3 via test wire c ₁₂ . This vein, the relay C is ₁₂ by an applied in line selector LW ₁ in any way earth potential excited (ground in the line selector LW _1, Core C _12, relay C _12, contact 106 Ji _31, resistance IVi _12, battery, earth). By closing contact 104C ₁₂ , relay ^ _{22 is} energized via: earth, battery, relay ^ ₂₂ , contacts 105Zz ₁₁ , 104C ₁₂ , earth. The AC power source PF _{21 is connected} to the wires of the connection line shown via the contacts 93% »and 95O ₂₂ and sends out an alternating current of 100 periods. By closing the contact 109O ₂₂ , the ReIaIaZJ _{11 is} excited via: earth, contact 109 B ₂₂ , relay H _n , resistor PFi ₁₄ , battery, earth. Relay JJ ₁₁ responds in this circuit and, by opening contact 105A _11, de-excites relay ^ ₂₂ . By closing the contact 98 A ₁₁ an excitation of the Reiais ^ i ₁₂ occurs: earth, battery, relay ^ a ₁₂ , contacts 98Zi ₁₁ , 97 /%, 104C ₁₂ , earth. Via I the contacts 9Oa ₁₂ and 92C ₁₂ , the alternating current source W _{11 is connected} to the wires of the connecting line for the purpose of emitting an alternating current surge of 50 periods. Ö5 By removing the short circuit at contact 117A ₁₁ , the relay .H _{21 is} excited via: earth, contacts 115 ß ₁₂ , 116 C ₁₂ , relay H ₂₁ , resistor Wi ₁₆ , battery, earth. By closing the contact 12IA ₂₁ , the relay'H _{31 is} excited via: earth, contact 121 Zj ₂₁ , relay H ₃₁ , resistor Wi ₁₇ , battery, end. By opening the contact 97 Ji ₂₁ , the relay ^ i _{12 is} de-energized and thus the alternating current source W ₁₁ is switched off again. By opening the contact 106A ₃₁ and closing the contact 107A ₂₁ , a resistor Wi _{32 is switched} into the occupancy circuit and thus an occupancy of the transformer Ue ₃ from another side is prevented. The relays Lf ₂₁ and H _sl are held via the contact 119A ₃₁ .

The Wecbseistrotnstoß emitted by the alternating current source W ₂₁ and IV ₁₁ now affect the individual transformers, as was described under point 2. The only difference is that the line selector reached is set by subscriber T ₂ .

5. Establishing a connection between the subscriber Γ «of the node exchange 1 and the subscriber 7 ~ _{G of} the node exchange 3

If the subscriber T ₂ wishes to set up a voice connection to the subscriber T _e , he will set the line selector LW after setting the call finder AS ₂ and preselector VW ₂ (FIG. 1) so that this line selector uses the transmitter Ue shown in FIG ₃ reached via test wire C ₂₂ . This creates the following circuit: earth in line selector LPF ₁ , wire c ₂₂ , relay C ₂₂ , contact 1061%, resistance Wi ₁₂ , battery, earth. In this circuit, the relay C ₂₂ responds and, by closing its contact ιοί C _22, energizes the relay A ₁₂ via: earth, battery, relay A ₁₂ , contacts 99 ^ ii. ίο ι C ₂₂ , earth. The alternating current source W ₁₁ is switched on via the contacts 90a ₁₂ and 920 ₁₂ for the purpose of emitting an alternating current surge of 50 periods to the wires of the connecting line. By closing the contact io8a ₁₂ , the ReIaIsLT _{11 is} excited via: earth, contact 108ß ₁₂ , relay Ji ₁₁ , resistor Wi ₁₁ , battery, earth. At contact 99 A ₁₁ , the excitation circuit of relay A _{12 is} disconnected and thus the alternating current source PF ₁₁ is switched off again. After the short-circuit at the terminal has been removed, contact 118 C ₂₂

clock 117 A ₁₁ excitation of relay H ₂₁ comes about via: earth, contact 118C ₂₂ , relay H ₂₁ , resistance Wi _w , battery, earth. By closing contact 121A ₂₁ , relay H _{31 is} excited via: earth, contact 121 Ji ₂₁ , relay Jf ₃₁ , resistor Wi ₁₇ , battery, earth. The relays H ₂₁ and .ZjT ₃₁ are held via contact 119 Zi ₃₁ . No further alternating current surge is emitted by the transformer Ue _3. This single alternating current initiates the switching operations already explained under number 3 in the further transformer, after which the line selector LW _{5 can be set} by the calling subscriber T ₂ to the desired subscriber T ₀ .

6. Establishing a connection between the subscriber F ₃ des

Node office 2 and the participant 20

mer T _{6 of} the node office 3

As can be seen from Fig. 1, after setting the call finder AS ₃ and the preselector VW ₃ , the subscriber T ₃ reaches a line selector LW ₃ , which he can set by sending number bursts to a contact via which the transmitter Ue ₅ can be reached is. It occupies this transformer Ue ₅ , as can be seen from FIG. 4, via the test wire C ₁₄ and hereby influences the relay C ₁₄ in some way which is not of interest here. By closing contact 174C ₁₄ , relay A _{13 is} energized via: earth, contacts 1/4 ^ 14, 173 ^ 12. Relay ^ ₁₃ , battery, earth, an alternating current source J ^ F ₁₂ is switched on via the contacts 165 a ₁₃ and i67ß ₁₃ for the purpose of emitting a current surge of 50 periods via the wires of the connecting line. Furthermore, after energizing the relay ^ i _13, the relay H _{12 is} energized via: earth, contact 175O ₁₃ , relay H ₁₂ , resistor Wi. _M , battery, earth. By opening contact 173A ₁₂ , relay A _{13 is} de-energized and thus the alternating current source W ₁₂ at contacts 165 (Z ₁₃ and ι6γα ₁₃₎ is switched off again. Relay H _{22 is energized via contact 176A 12} after contact 179A _{12 has opened} (earth , Contact 17CIi ₁₂ , relay H ₂₂ , resistance Wi _m , battery, earth) and energizes relay H _{32 by closing contact 182A 22.} Relays If ₂₂ and Ji ₃₂ are held via contact 180 A ₃₂ .

In the transformer Ue, - _{the relay X 3 is} influenced by the alternating current surge of 50 periods and leaves the line selector LW ₅ occupied in the manner already described under item 3 , whereupon it can be set to the desired subscriber.

Claims (5)

Patent claims: ι. Circuit arrangement for telephone systems with dialer operation and several in-line exchanges between which connecting lines that can be reached via voters with free choice run, characterized in that switching devices (MW ₁ , MW ₃ ) are provided in the exchanges, which are independent of any existing between these exchanges Interconnect free connection lines running between the exchanges before being occupied by a calling connection point to form a connection path running through the exchanges in series. 2. Circuit arrangement according to claim i, characterized in that These switching devices give voters free choice to the next exchange Shut down the leading connecting lines without initially preventing these connecting lines from being used to be blocked by other, parallel voters with free choice. 3. Circuit arrangement according to An go claim i, characterized in that switching means (Fig. I, U ₁ , U ₂ ) are provided in the exchanges, which take effect when the preparatory established connection path is occupied and ¹ this through the occupied access disconnect certain exchange. 4. Circuit arrangement according to claim i, characterized in that the Switching means in the switching center determined by the occupied access to the incoming part of the connection path another connection path set up preparatory in this exchange turn on. 5. Circuit arrangement according to claim 4, characterized in that this switching means after the connection of the preparatory set up in the exchange Connection path this against a connection to the incoming part of a further connection path lock. In addition 3 sheets of drawings BERLIN. PRINTED IN DEC