DE865472C - Circuit arrangement for line selectors in telecommunications, especially telephone systems - Google Patents

Description

Circuit arrangement for line selectors in telecommunications, in particular Telephone systems The present invention relates to a circuit arrangement for Line selectors in telecommunications, in particular telephone systems.

Line voters who meet modern demands must be set up in such a way that their use in local and long-distance traffic is possible, that they -furthermore the connection of bus lines (multiple contact) as well as the call allow a night call connection line lying within the collecting lines.

In order to be able to meet all of these requirements, there is a large number of switching means and circuit arrangements required. The present invention sets itself the task of setting up the line selector so that in particular with regard to the procedures to enable multiple connections and the night number switching results in a significant simplification of the circuit arrangements associated with a extensive savings in switching elements. According to the invention it is provided that when choosing the post-call connection line located within the multiple connection the switching means receiving the number current surge series the devices for automatic Continuation of the line selector is ineffective.

The drawing shows an embodiment of the subject matter of the invention shown.

When the local trunk line selector shown here is occupied by an upstream connecting device or line, the occupancy relay C responds via wire c. The numbered current impulse series arrive via the upper voice wire and are picked up by the current impulse receiving relay E: wire a, contact 2 a, winding I. Of the relay E, resistance Wi 1i; -. By pulsed opening and closing of the contacts 29 e and 30 e, the first number current impulse series transmitted to the line selector is transmitted to the Rebmagnet H: +, winding I of the relay V, contacts 29 e, 12 u, ii w (one of the after the first turning step of the selector operated shaft contacts), Rebmagnet H, -. 'The switching arms of the line selector will be raised in a certain decade. In the circuit just mentioned, the relay V, which closes the contact 53 v, also responds. As a result, a short circuit running through contact 55 a is produced for winding II of relay V, which has the effect that relay Y does not drop out during the series of numbered current impulses. If there is a longer pause after lifting the line selector, relay V can drop out, and a circuit for relay U is closed: earth, winding I of relay Y, contacts 30 e, 31 k (one of the actuated outside the rest position of the line selector Head contacts), 24 c, winding I of relay U, contacts i5 v, 14 w (shaft contact), 17 t, 18 P, 26 z, 2o a, rotary magnet D, -. Only the relay U responds in this circuit and is in the following holding circuit: +, contacts 69 c,. 71 p, 67 u, winding III of relay G (has fault current), winding II of relay U, resistance Wi io, -.

The second row of number strokes is transmitted to the rotary magnet D of the line selector as follows: -j-, winding I of the relay. V, contacts 2g e, 13 u, 14w (shaft contact), 17 t, 18 P, 26 z, 2o a, rotary magnet D, -. Relay V bridges the series of current impulses again and, after opening the contact, maintains the switching circuit at contact 16 v. Relay E also switches on relay M: +; Contacts 69 c, 78 i, 75 e, winding I of the relay M, contacts 82 t, 57 e, resistance Wi 1o, -. This circuit was created when the first series of current impulses was transmitted, but had no effect. The following holding circuit is established for relay M: -Contacts 69 c, 71 A 73 m, winding I of relay M, contact 82 t, -resistance Wi 9, reference sign, resistance Wi i, contact 33 v, winding I of relay G (has Fault current), contact io w (shaft contact), Rebmagnet H (does not respond), -. If the relay Y drops again after the selector arms have been screwed in, so. If the participant is free, relay M will - hold on even further via the test arm of the line selector and test wire in the preselector of the required participant, otherwise relay M drops out immediately after relay V.

After the relay V drops out, the following circuit for relay G is closed: +, slow breaker CLOSED 1, contacts 35 u, 34 v, winding I of relay G, contact io w, Rebmagnet H (does not respond), -. The relay G closes a short circuit for the holding winding II of the relay U at contact 59 g, so that this relay drops out. At contact 35 2, the above-mentioned circuit for da: relay G is opened. This falls off with a delay. During the delay time of relay G the following is checked: - [-, contacts 69-c, 88 2i, winding 1 of relay P, contact 86 g, winding II of relay P, switching arm c of the line selector and - in the preselector of the selected subscriber.

If the selected line is busy, the test relay P in the circuit just mentioned does not respond. The calling subscriber receives a busy signal: +, busy signal BZ, capacitor, contacts 47a, 45 p, 21 c, winding III of relay E, contact 22 w '(shaft contact), -f-. The busy signal is transmitted inductively to windings I and II on the voice wires (the latter is switched on after the relay M has dropped out at contact 3 m) and made audible to the calling subscriber. After hanging up the receiver at the calling station, relay C drops out. The rotary solenoid receives current impulses to trigger the line selector in the following way: -, winding I of relay V, contacts 30 e, 31: k, 25 c, 17-t, 18 p, 26 z, 2o a, rotary solenoid, -. The rotary magnet D closes its contact 32 d and thus the following circuit: -, Rebmagnet H (does not respond), contact io w, winding I of relay G (does not respond), contact 32 d, resistor Wi 5, winding I of the relay T, resistance Wi 2, contact 68 c; +. - Relay T interrupts the switching circuit for the rotary magnet D at contact 17 t , so that the circuit for relay T is also opened again at contact 32 d. The alternating game continues until the line selector arms have reached the rest position and the shaft contacts move into the rest position. -If the selected participant is free, however, the relay P can respond in the above-mentioned test circuit. It lies in the following holding circuit: -, contacts 69 c, 72 P, winding III of the relay P, -. By closing the contact 89 p and the shortly thereafter closing contact 85 g, the following reverse current circuit is created: Earth, contact 95 a, resistance Wi 7, contacts 89 P, 85 g, switching arm c of the line selector, etc. Relay M can switch over its winding I don't hold up any longer. However, it remains excited for a short time via its winding II and the low-speed interrupter LU 2: -3-, LU 2, winding II of relay M, contact 40 m, winding III of relay V, contacts i9 P, 26 z, 2o a, Rotary solenoid D (does not respond), -. In this circuit, the relay V also responds, which switches on the ringing current at contact 52. The sending of the first. However, the call takes place (at contact 49 g) with a delay determined by the release time of relay G, ie after the test time has ended. If this delay were not provided, the call relay could be influenced by the ringing current source in the preselector of the called subscriber, if it is not yet switched off by the isolating relay on the upper speech artery, thereby causing a malfunction. The current flow for the ringing current transmission runs as follows: -, Ringing current source RQ; Contact 52 v, winding I of relay A, contacts 49 g, 50 A switch arm a of the line selector, subscriber loop, switch arm b of the line selector, contacts 54 A 55 a, +. If the above-mentioned circuit is interrupted shortly thereafter by the slow interrupter LU 2 , the relays 167 and V drop out. The 10-second switch is switched on via contact 39 m and the contact 37 g, which has also dropped in the meantime, so that ringing current is sent out through relay V at intervals of 10 seconds. The dial tone for the calling subscriber is picked up by the winding III of the relay E via contacts 43 v, 44 A and transmitted inductively to the calling subscriber via the windings I and II of the relay E.

If the called subscriber answers during a pause in the call, relay A is switched on: -, resistor Wi ii, contact 51 v, winding I of relay A, contacts 49 g, 50 P, switching arm a of the line selector, subscriber loop, switching arm b of the line selector , Contacts 54 P, 55 a, -I- and after response of relay A and opening of contact 55 a, winding II of relay A, +. If the subscriber reports during a ringing pulse, relay A responds via contact 52 v, ringing current source RQ and -. By relay A (contacts 20 a and 55 a open) the winding II of the relay V applied via contact 53 v is switched on. This winding is a counter-winding to winding III of the relay V. The relay V is therefore quickly brought to waste, so that then relay A is fully effective with both windings. By closing the contact 94a, instead of the resistor Wi 7, the winding I of the counting relay Z is placed in the blocking circuit and excited. Z lies in the following holding circle: +, contacts 69 c, 78 i, 79 N, winding II of relay Z, -. The final blocking circuit then runs through contact 96 z and resistor Wi 7. The speech wires are switched through at contacts ia and 9 a. By closing the contact 7 z, counting voltage is applied to the lower speech wire.

To establish connections to subscribers with multiple connections, two switch arms i SK and -2 SK are provided, which work in a known manner so that when the line selector is set according to the collective number, the switch arm i SK runs onto its associated segment, while the switch arm 2 SK this Segment only reached when the switching arms are switched for the second time. Under certain circumstances, an empty contact is provided in front of the group of collective contacts. If the relay V drops after selecting the collective number and corresponding setting of the line selector arms, the relay G is switched on via the slow breaker LU i in the manner described, which short-circuits the holding winding II of the relay U at contact 59-. As previously described, the state of the first connected subscriber line is checked via contacts 86g and 88u. If this is occupied, relay P cannot respond and relay G will drop out after some time (delay time). The rotary magnet then receives in the following way a further current impulse winding 1 of the relay 17, contacts 30 e, 31 k, 28 ä, 48 u, switching arm i SK, contacts 17 t, 18 P, 26 x, 2o a, rotary magnet, -. The switching arms of the line selector thus reach the next multiple contact. The relay G is in turn switched on by the contact 32 d of the rotary magnet. This circuit runs through resistor Wi 3, contacts 61 t, 64 i, 66 et, 71 P, 69 c. The subscriber line that is now switched on is again checked for its status. If this line is also occupied, after the relay G has dropped, which had interrupted the circuit for the rotary magnet at contact 28 g, it is brought to waste and the switching circuit for the rotary magnet is closed again. In this way, the line selector switching arms are forwarded until a free line within the multiple connection is reached, or if all the lines of the multiple connection are busy (switching arm i Sh has expired from the segment), the line selector is shut down and the busy signal is transmitted to the calling subscriber as described Way done. During the advancement of the line selector within the multiple connection lines, the relay V does not drop due to its short-circuit winding II. It keeps the winding III of the relay E switched off at contact 23 v.

If the line selector reaches a free hunt group line, speaks the test relay P and initiates the switching processes described above. By When contact 18 p is opened, the rotary magnet is switched off by the switching circuit.

If the location establishing the connection dials the so-called night call number, i.e. if the line selector is set to a specific connection line of the multiple connection, the switching arms i SK and 2 SK are both on the segment after the last series of numbered bursts and the relay V drops out. The following circuit is then established: -f-, contact @ 2? , w (shaft contact), winding III of relay E, contacts 21 c, 23 v, switch arm 2 Sli, segment, switch arm i SK, contacts 17 t, 18 P, 26 z, 2o a, rotary magnet D (does not respond), -. The relay E separated by opening the contact 30, the relay e V, winding I and signal ground of the serving for the automatic switching operation of the line selector circuits, so that it stops in the position assumed. The state of the connected connection line is then checked in the manner described. If the subscriber station on the night call is free, the relay P responds, which interrupts the circuit for the relay E at contact 18 ß. If the subscriber is busy, however, the relay E remains switched on until the subscriber, made aware of the busy status of the desired subscriber connection by the busy signal, hangs up the receiver and thereby gives the signal to trigger the line selector.

If the line selector is occupied in long-distance traffic, then a battery is applied to voice wire b from an upstream connection device during the last series of pulses. While turning the line selector (relay M energized), relay J is switched on: speech wire b, contact 4 M, winding I of relay J, contacts 5 u, 6 c, +. Relay J is in the following holding circuit: Contacts 69: c, 77i, resistance Wi 6, winding III of relay J, resistance Wi io, -. If the desired participant is free, the test relay P responds in the normal way. All other processes proceed as described above with the exception that after the test, direct earth is applied via contacts 85 g, 89 p-, 91 i and 95 a (later 96 x) , so that the connected subscriber is blocked against any new assignment is (remote exchange blocking).

If the participant is manned, the test relay P cannot respond. During the limited test time, the following circuit is established, which is not effective during free tests: +, contacts 69 c, 7i p, 66 u, 65 i, 63 m, resistance Wi 4, winding I of relay T, contact 59 g, resistance Wi 1o, -. Relay T is held in a voltage divider circuit parallel to the voltage divider circuit at the busy subscriber, namely: -, resistor Wi 8, contact 83 t; and from here on the one hand via contact 84 i, test switch arm c and on the other hand via winding II of relay T, contacts 87 t, 69 c, - [-.

In order to be connected to the occupied participant, an impulse is sent via the a-wire, through which the relay E is switched on. A short circuit is then made for the holding winding III of the relay J via contacts 57 c and 81 t, so that it drops out. This creates the following circuit: +, contacts 69 c, 71 p, 66 u, 64 i, 6o t, winding fII of relay G, winding I of relay A, contact 51 v, resistor Wi i1, -. Relay A, which responds in this circuit, ensures that the speech wires are switched through by closing contacts ia and 9 a. Via contacts 45 $ and 46 a , the remote exchange sign FAZ is transmitted to winding III of relay E and from this inductively to winding I and II, so that the subscribers in the conversation are notified of the presence of a remote connection. The relay G also responds and initiates the test process at contact 86 g, which can be carried out immediately after the requested participant has hung up. If then the relay P responds, the above-mentioned circuit for the relays G and A at the contact 71 p is interrupted. The relay J is then switched on again during the drop-out delay of the relay G via its winding II: - {-, winding II of relay J, contacts 41 t, 38 g, 39 m, winding III of the relay. V, contacts 19 P, 26 z, 2o c, rotary magnet D (does not respond), -. Relay f places itself in the hold circuit described above via contact 77 i , so that the connection is immediately marked as being remotely occupied.

When a group number is called in long-distance traffic, the line selector is set to this free connection line, provided that a line in the hunt group is still free. If all the bus lines are occupied, the line selector automatically advances to the first manned connection. The state of the bus lines is indicated by a chain of contacts vs assigned to the individual bus lines, indicated in the drawing at the top right. If a collecting line is free, then minus is connected to the test arm on the empty contact via resistor Wi 15; if all collecting lines are occupied, plus is applied to the chain of the then closed vs contacts. In the first case, relay M is kept energized via its winding I, and the circuit for automatic switching of the line selector is controlled by relay G-, as previously described. The relay G is switched on every time via contact 32 d, resistance Wi 3, contacts 62 m, 65 i, 66 u, 71 p and 69 c .: Is to indicate that all multiple connection lines are occupied, plus on the chain of the vs Contacts, then the holding of the relay M is prevented. The relay T is then effectively switched on via its winding I, resistor Wi 4, contacts 63 m, 65 i, 66 u, 71 P, 69 c. With T as relay interrupter, the line selector is now switched step by step until the first busy connection line is reached. The relay T is switched on via contact 32 d and resistor Wi 5, while the excitation circuit for the rotary magnet is interrupted at contact 17 t. The winding I of relay G in the circuit for relay T (winding I) has a fault current and cannot respond. Each time the relay T responds, its winding II is placed in the above-mentioned voltage divider circuit via contacts 83 t, 84 i and 87 t. A holding circuit via this winding is only established when the line selector is set to a locally manned connection line, but not when it is remotely, as this is prevented by the remote exchange blocking (direct blocking earth). The activation and signaling (with the help of relays E and, j), then the test after hooking up the requested participant (relay G switched on via winding III) and the other processes are carried out in the manner described.

If the night number is dialed in long-distance traffic, the result is if the participant is free, no significant change from the operations in local traffic. If the desired participant is busy, it will be in the same Way as previously described by relay E an automatic forwarding of the Prevents the line selector via the collecting lines. At the same time, however, the Aufscha.ltung initiated in the manner described by relay T. When responding of relay T, relay E is switched off by contact 171.

If the night call connection line is remote, the relay can T do not address. The relay E remains until the waiver by the calling station ° initiated release of the connection excited.

The agency providing the long-distance connection has the option of connecting to a station-manned subscriber to call the subscriber who is connected, ie to call him again after the connection has been terminated and to send him notifications. The relevant switching gates are as follows: After hanging up the receiver at the station called, relay A drops out. The result is the following circuit for relay M: -f-, contact 36 i, winding III of relay M, contacts 27 z, 2o a, rotary magnet D (does not respond), -. A flicker FL U is applied to the lower speech wire via contact 4 m : -FLU, contact 70 z, winding I of relay J, contact 4 m, speech wire b. In this way, the remote officer receives knowledge of the termination of the connection. In order to get in touch with the participant again, it sends a ground pulse over the upper speech wire, through which the relay E is switched on via contact 2a. Relay E interrupts the holding circuit for relay Z at contact 74 e, which switches off the flickering signal at contact 7o z and opens a point in the above-mentioned circuit for winding III of relay M. This relay does not drop out immediately, however, because it remains switched on for the first call via its winding II through contact 56 e +, contact 56 e, winding II of relay M, contact 40 m, winding III of relay V, contacts i9 P, 26 z, 2o a, rotary magnet D, -. Ringing current is sent out through relay V in the manner described. After the earth pulse has ceased, relay M drops out. The 10-second switch is then applied via contacts 39 m and 37 g and ringing current is sent out periodically until the subscriber reports.

Claims (6)

PATENT CLAIMS: i. Circuit arrangement for line selectors with multiple connections in telecommunication systems, in particular telephone systems, characterized in that when the night call connection line located within the multiple connection is selected, the switching means (E) receiving the number current surge series override the devices for automatic switching of the line selector. 2. Circuit arrangement according to claim i, characterized in that after receiving the the night call collective connection line Characteristic impulse series of the interrupter circuit for the rotary magnet (D) of the line selector is kept open by the switching means. 3. Circuit arrangement according to claim i, characterized in that the switching means when found free Night call connection line is switched off and made available for other purposes, while if the connection line is busy, it can be triggered by the calling station remains switched on. 4. Circuit arrangement according to claim 3, characterized in that that in long-distance traffic when a station is found occupied (relay T energized) the switching means the processes are influenced by the agency mediating the remote connection to connect to the manned subscriber (through-connection of the speech wires, Telecommunication signal transmission) initiates. 5. Circuit arrangement according to claim 3, characterized marked that in long-distance traffic after the final signaling on the part of the called If the switching device is still under the influence of the exchange, so that with its help a recall of the called station (obituaries) is possible will. 6. Circuit arrangement according to claim 5, characterized in that when influenced of the switching means for the purpose of recalling the transmission of the first ringing pulse immediately is controlled by the switching means.